This document summarizes a study on modeling and simulating a four-propeller submarine drone using Matlab. It presents the mathematical modeling of the submarine's kinematics and dynamics. The kinematic model describes the vehicle's motion and orientation using Euler angles. The dynamic model accounts for forces like weight, buoyancy and thrust from the four propellers. The simulation aims to analyze the submarine's behavior under different propeller configurations to validate the multi-thruster propulsion system architecture.
THE INFLUENCE OF DRIVING AXLE LOCATION ON THE LATERAL FORCE OF VEHICLEIAEME Publication
The lateral force acting on the tires produces a side slip angle that affects the
directional stability of vehicle. This paper presents some research results of the
influence of driving axle location on the lateral force of vehicle with 4x2 wheel
formula when vehicle is turning. The single track dynamical models of FWD and RWD
vehicle while cornering are created. Based on these two dynamical models, the system
equations of motion built are enable to study the influence of driving axle location on
the lateral force. Some calculated simulation results are shown for illustration.
This document summarizes a study that analyzed the flow behavior and aerodynamic performance of a three-bucket helical Savonius rotor at different twist angles using computational fluid dynamics (CFD). A 3D model of a rotor with 90-degree twist was constructed and simulated at various rotor angles. High pressure and velocity were observed on the advancing bucket at a rotor angle of 30 degrees, resulting in maximum positive torque. The study aims to increase efficiency at all rotor angles through the use of a helical design compared to a conventional Savonius rotor.
This document summarizes the kinematics analysis of a 3-UPU (universal-prismatic-universal) parallel robot. Each of the robot's three legs consists of two universal joints connected by a prismatic joint. The document establishes recursive matrix relations for solving the inverse kinematics problem given the position of the mobile platform. Simulation graphs are generated for the input displacements, velocities, and accelerations. The kinematics analysis determines the nine independent variables that define the robot's configuration based on vector-loop equations relating the joint parameters and platform position.
The patent pending Assisted Vertical Take-off technology is a synergy of ancient and state-of-art technology enabling vertical take-off of fixed wing UAVs
The document presents a dynamic model for lifting railway tracks as a one-mass system. It derives the equation of motion for the model numerically using a Runge-Kutta integration scheme. The model accounts for parameters like mass, stiffness, damping, and lifting force. Numerical solutions show that damping coefficients affect the duration and quality of lifting, while lifting forces impact the lift value and duration. The dynamic model allows studying how system parameters influence behavior and stability during railway track lifting.
Dynamic modelling and optimal controlscheme of wheel inverted pendulum for mo...ijctcm
Unstable wheel inverted pendulum is modelled and controlled deploying Kane’s method and optimal
partial-state PID control scheme. A correct derivation of nonlinear mathematical model of a wheel inverted
pendulum is obtained using a proper definition of the geometric context of active and inertia forces. Then
the model is decoupled to two linear subsystems namely balancing and heading subsystems. Afterward
partial-state PID controller is proposed and formulated to quadratic optimal regulation tuning method. It
enables partial-state PID to be optimally tuned and guarantees a satisfactory level of states error and a
realistic utilization of torque energy. Simulation and numerical analyses are carried out to analyse
system’s stability and to determine the performance of the proposed controller for mobile wheel inverted
pendulum application.
This document covers the topic of kinematics, which is the study of motion without regard to its causes. It discusses various kinematic concepts including linear and angular displacement, velocity, acceleration, and their relationships. Formulas are derived for uniformly accelerated motion based on definitions of terms and velocity-time graphs. Examples problems apply the concepts and formulas to analyze the linear and rotational motion of objects undergoing changes in velocity such as cars accelerating and decelerating. The document also addresses projectile and free-fall motion under the acceleration of gravity.
Abstract This paper presents the design and implementation of a quadcopter capable of payload delivery. A quadcopter is a unique unmanned aerial vehicle which has the capability of vertical take-off and landing. In this design, the quadcopter was controlled wirelessly from a ground control station using radio frequency. It was modeled mathematically considering its attitude and altitude, and a simulation carried out in MATLAB by designing a proportional Integral Derivative (PID) controller was applied to a mathematical model. The PID controller parameters were then applied to the real system. Finally, the output of the simulation and the prototype were compared both in the presence and absence of disturbances. The results showed that the quadcopter was stable and able to compensate for the external disturbances.
THE INFLUENCE OF DRIVING AXLE LOCATION ON THE LATERAL FORCE OF VEHICLEIAEME Publication
The lateral force acting on the tires produces a side slip angle that affects the
directional stability of vehicle. This paper presents some research results of the
influence of driving axle location on the lateral force of vehicle with 4x2 wheel
formula when vehicle is turning. The single track dynamical models of FWD and RWD
vehicle while cornering are created. Based on these two dynamical models, the system
equations of motion built are enable to study the influence of driving axle location on
the lateral force. Some calculated simulation results are shown for illustration.
This document summarizes a study that analyzed the flow behavior and aerodynamic performance of a three-bucket helical Savonius rotor at different twist angles using computational fluid dynamics (CFD). A 3D model of a rotor with 90-degree twist was constructed and simulated at various rotor angles. High pressure and velocity were observed on the advancing bucket at a rotor angle of 30 degrees, resulting in maximum positive torque. The study aims to increase efficiency at all rotor angles through the use of a helical design compared to a conventional Savonius rotor.
This document summarizes the kinematics analysis of a 3-UPU (universal-prismatic-universal) parallel robot. Each of the robot's three legs consists of two universal joints connected by a prismatic joint. The document establishes recursive matrix relations for solving the inverse kinematics problem given the position of the mobile platform. Simulation graphs are generated for the input displacements, velocities, and accelerations. The kinematics analysis determines the nine independent variables that define the robot's configuration based on vector-loop equations relating the joint parameters and platform position.
The patent pending Assisted Vertical Take-off technology is a synergy of ancient and state-of-art technology enabling vertical take-off of fixed wing UAVs
The document presents a dynamic model for lifting railway tracks as a one-mass system. It derives the equation of motion for the model numerically using a Runge-Kutta integration scheme. The model accounts for parameters like mass, stiffness, damping, and lifting force. Numerical solutions show that damping coefficients affect the duration and quality of lifting, while lifting forces impact the lift value and duration. The dynamic model allows studying how system parameters influence behavior and stability during railway track lifting.
Dynamic modelling and optimal controlscheme of wheel inverted pendulum for mo...ijctcm
Unstable wheel inverted pendulum is modelled and controlled deploying Kane’s method and optimal
partial-state PID control scheme. A correct derivation of nonlinear mathematical model of a wheel inverted
pendulum is obtained using a proper definition of the geometric context of active and inertia forces. Then
the model is decoupled to two linear subsystems namely balancing and heading subsystems. Afterward
partial-state PID controller is proposed and formulated to quadratic optimal regulation tuning method. It
enables partial-state PID to be optimally tuned and guarantees a satisfactory level of states error and a
realistic utilization of torque energy. Simulation and numerical analyses are carried out to analyse
system’s stability and to determine the performance of the proposed controller for mobile wheel inverted
pendulum application.
This document covers the topic of kinematics, which is the study of motion without regard to its causes. It discusses various kinematic concepts including linear and angular displacement, velocity, acceleration, and their relationships. Formulas are derived for uniformly accelerated motion based on definitions of terms and velocity-time graphs. Examples problems apply the concepts and formulas to analyze the linear and rotational motion of objects undergoing changes in velocity such as cars accelerating and decelerating. The document also addresses projectile and free-fall motion under the acceleration of gravity.
Abstract This paper presents the design and implementation of a quadcopter capable of payload delivery. A quadcopter is a unique unmanned aerial vehicle which has the capability of vertical take-off and landing. In this design, the quadcopter was controlled wirelessly from a ground control station using radio frequency. It was modeled mathematically considering its attitude and altitude, and a simulation carried out in MATLAB by designing a proportional Integral Derivative (PID) controller was applied to a mathematical model. The PID controller parameters were then applied to the real system. Finally, the output of the simulation and the prototype were compared both in the presence and absence of disturbances. The results showed that the quadcopter was stable and able to compensate for the external disturbances.
Abstract This paper presents the design and implementation of a quadcopter capable of payload delivery. A quadcopter is a unique unmanned aerial vehicle which has the capability of vertical take-off and landing. In this design, the quadcopter was controlled wirelessly from a ground control station using radio frequency. It was modeled mathematically considering its attitude and altitude, and a simulation carried out in MATLAB by designing a proportional Integral Derivative (PID) controller was applied to a mathematical model. The PID controller parameters were then applied to the real system. Finally, the output of the simulation and the prototype were compared both in the presence and absence of disturbances. The results showed that the quadcopter was stable and able to compensate for the external disturbances.
IRJET- Seismic Analysis of Curve Cable-Stayed BridgeIRJET Journal
1) The document analyzes the seismic performance of cable-stayed bridges with different horizontal curvatures, ranging from straight to 5 degrees of curvature.
2) Six bridge models were analyzed using the software SAP2000, including a straight bridge and bridges with 1, 2, 3, 4, and 5 degrees of curvature.
3) The results show that base shear, pier displacement, and deck displacement all decreased as curvature increased from straight to 3 degrees, but then increased again from 3 to 5 degrees of curvature. The bridges with intermediate (2-3 degree) curvature demonstrated the best seismic performance.
The Effect of Arm Stiffness on the Elasto-Kinematic Properties of Single-Axle...theijes
The paper is focused on the stiffness analysis of the longitudinal arm of single-axle suspension on elastokinematic behaviour of the vehicle axle which is highly important when considering the handling characteristics related tovehicle safety.The elasto-kinematic behaviour of the axle determines the course of the geometrical parameters of wheel suspension, the toe angle and camber as the function of wheel movement during force loading. This paper presents the complex MBS (Multi-Body Simulation)model of the wheel suspension with nonlinear characteristics of rubber-metal bushings. The model also comprises force elements such as springs, shock absorbers, stops and the transverse stabilizer. The model of flexible arm is implemented in the MBS model using the Craig-Bampton method, which represents a flexible body based on the synthesis of its own modal shapes. Subsequently,elasto-kinematic simulations are performed with the help ofthe computational system Hyperwork. The computational part of the paper presents the results of the elasto-kinematic behaviour of wheel axle for the flexible arm with different sheet metal thicknesses (2, 3 and 4 mm) and different materials (steel and aluminium alloy AlSi7Mg). Individual calculation models are compared to each other and also to the model of suspension with therigidarm. Elasto-kinematic analyses are also validated by the measurement inthe testing stage.
This document analyzes the suspension system of an automobile modeled as a two-degree-of-freedom spring-mass-damper system. Equations of motion were derived using Lagrange's equations and modeled in SIMULINK. Natural frequencies were found to be 5.1 rad/s and 6.5 rad/s. Increasing damping reduced bounce by 3x10-3 m to 1x10-3 m and pitch by 5x10-4 m to less than 1x10-4 m. MATLAB modal analysis verified results and natural frequencies were compared.
The document summarizes a master's thesis that analyzes and develops controllers for a quadcopter. It presents the dynamic equations of the quadcopter and linearizes them. Two backstepping controllers are developed - a simpler one that cannot absorb disturbances, and a more advanced one that can handle disturbances like changes in mass. Both controllers separate attitude from horizontal/vertical position control. The controllers are simulated and compared to evaluate their performance.
Prediction tool for preliminary design assessment of the manoeuvring characte...Enrico Della Valentina
This document describes the development of a prediction tool to assess the manoeuvring characteristics of a twin screw displacement yacht in preliminary design. The tool uses numerical simulations in MARIN's SURSIM software to evaluate how variations in rudder area, position, rate of turn, and metacentric height impact yaw checking, course changing, turning ability, and directional stability. Standard manoeuvres like zigzags and turning circles were simulated across a range of design parameters to provide sensitivity analysis and guidance for design improvement. The results of the simulations are presented and discussed.
This document summarizes a degree project that designed a concept for a single-manned human-powered aircraft to theoretically complete the Kremer International Marathon prize course of flying 42,195 meters in under one hour. The project introduces human-powered flight basics and the prize requirements. It then details the aircraft design process, which included evaluating airfoils, calculating lift and thrust needs. The designed concept aircraft, called Euler One, is presented along with analyses of its aeronynamic properties and propeller. The conclusion is that the prize is theoretically feasible but not economically viable with today's materials costs. Future work could improve the design and potentially lead to a successful prize attempt.
2006 Green Incorporating Pulse to Pulse Motion Effects anto Side Looking Arra...Justin Green
This document presents a technique for incorporating pulse-to-pulse motion effects into side-looking array radar data models. The technique accounts for changes in platform attitude between pulses, which affects the geometry between the radar and targets. It uses coordinate transformations to describe how the platform orientation changes with each pulse. This allows calculation of pulse-dependent parameters like spatial frequency and Doppler, extending the existing radar data model to be sensitive to platform motion. The new motion-sensitive space-time snapshot can then be used to characterize how motion impacts the performance of space-time adaptive processing algorithms.
The formula cars need high tire grip on racing challenge by reducing rolling displacement at corner or
double change lands. In this case study, the paper clarifies some issues related to suspension system with
inerter to reduce displacement and rolling angle under impact from road disturbance on Formula SAE
Car. We propose some new designs, which have an advance for suspension system by improving dynamics.
We optimize design of model based on the minimization of cost functions for roll dynamics, by reducing the
displacement transfer and the energy consumed by the inerter. Base on a passive suspension model that we
carried out quarter-car and half-car model for different parameters which show the benefit of the inerter.
The important advantage of the proposed solution is its integration a new mechanism, the inerter, this
system can increase advance in development and have effects on the vehicle dynamics in stability vehicle.
Bifurcation Analysis of High-Speed Railway Vehicle in a CurveIDES Editor
This paper investigates the bifurcation and limit cycle behavior of a 38 degree-of-freedom model of a high-speed railway vehicle. The model considers longitudinal, lateral, vertical, rolling, pitching and yawing motions. The paper finds that the critical hunting speed decreases with increasing wheel conicity. It also finds that the critical hunting speed and hunting frequency calculated using a linear elastic rail model are higher than those calculated using a nonlinear elastic rail model. Frequency analysis shows the main frequencies from the linear model are higher than the nonlinear model.
The document proposes using model predictive control (MPC) to optimize the trajectory of an unmanned aerial vehicle (UAV) transporting passengers between Berkeley, San Francisco, and Palo Alto. MPC is used to minimize input power while keeping the UAV within a virtual tube around the reference trajectory. Simulation results showed the UAV successfully followed the trajectory between destinations while obeying constraints. Future work could utilize a curvilinear coordinate system and learning MPC to further optimize travel times.
The document discusses dynamic modeling of robot manipulators using the Euler-Lagrange approach. It introduces dynamic models and the direct and inverse problems. The Euler-Lagrange approach is then explained in detail. It involves computing the kinetic and potential energies of each link based on the link masses, centers of mass, moments of inertia, and joint velocities and positions. This allows deriving the dynamic equations of motion for the manipulator.
This document describes a constructive solution for a rotating machine with profiled rotors that can function as either a force machine or work machine. Key points:
- The machine has two counter-rotating profiled rotors inside casings that transport fluid from a suction to discharge connection.
- A mathematical relationship is derived showing that the height of the rotating pistons should equal the rotor radius to maximize efficiency.
- Details are provided on the gear mechanism used to synchronize rotation of the rotors without penetrating shafts.
- Equations are given to calculate the coordinates that define the contour profile of the rotors based on design parameters like rotor radius.
- Tables show example coordinate points used to
Robust Control of a Spherical Mobile RobotIRJET Journal
This document summarizes a research paper about controlling a spherical mobile robot using sliding mode control. It begins with an abstract that describes the challenges of controlling spherical robots due to their underactuated systems. It then provides background on previous control methods for spherical robots. The document presents the kinematic model of a 2-DOF spherical robot and describes how sliding mode control can be used to provide robust control and path following for the robot. It provides the equations for the sliding mode controller design. Finally, it presents simulation results showing the robot following a desired trajectory with minimal tracking error using the sliding mode controller.
This document presents a detailed modelling and analysis of parasitic effects in the dynamics of multi-rotor hovercrafts. It focuses on modelling these effects for a T-configuration tri-rotor hovercraft called a T-Copter. The parasitic effects modelled include air drag moments, tilt reaction moments, precession moments, and various angular acceleration effects like Coriolis and centripetal accelerations. Equations are developed to model these effects based on the hardware configuration and dynamics of the T-Copter system. Experimental data is also used to generate polynomial functions modelling the air drag moments.
Structural Analysis of a Bungalow Reportdouglasloon
Taylor's University Lakeside Campus
School of Architecture, Building & Design
Bachelor of Science (Hons) in Architecture
Building Structures (ARC 2523 / BLD 60103)
Project 2: Structural Analysis of a Bungalow
A Mixed Bi-directional S-curve Acceleration/Deceleration Control Algorithm fo...IJRES Journal
This document presents a mixed bi-directional S-curve acceleration/deceleration control algorithm for continuous line segments in high-speed machining. The algorithm aims to simplify velocity planning calculations and improve machining efficiency by determining the optimal S-curve type (7-period or 5-period) based on the displacement and velocity parameters of each segment. It can classify six cases to identify the S-curve type and calculate the corresponding velocity, acceleration, time and displacement parameters. The algorithm was analyzed through a simulation example to validate it can effectively control velocity changes and avoid mechanical vibration during interpolation of continuous segments.
This document presents the design of a measurement device using accelerometers to analyze the behavior of railroad gladhand assemblies used for connecting air brake hoses. The goal is to help Union Pacific quantify peak forces and torques that cause gladhands to detach during operation. The preliminary design proposes using six 3-axis accelerometers - three placed on each gladhand assembly to record acceleration data, from which forces and torques can be calculated. Key challenges addressed include choosing between accelerometers and torque meters, and determining the optimal accelerometer configuration and placement on the gladhand assembly.
This document contains lecture slides about dynamics and kinematics concepts including curvilinear motion, velocity and acceleration in polar coordinates, and dependent motion analysis. Examples are provided to demonstrate how to relate the motion of connected objects using position, velocity, and acceleration equations in systems with pulleys and ropes. Procedures are outlined for analyzing dependent motion problems involving multiple connected particles moving along rectilinear paths. Specific practice problems are assigned from the textbook at the end.
This document investigates how changing the position of the tool point on the moving platform affects the dynamic performance of a 3RRR planar parallel manipulator. Lagrange-d'Alembert formulation is used to develop the dynamic model. The manipulator's dimensions and parameters remain the same, while only the tool point position is changed. Simulation results show that locating the tool point at an optimal position reduces the generalized forces and energy consumption of the manipulator, improving its dynamic performance.
The researchers used strain gauges to experimentally determine the drag coefficient of a scale model Toyota car. Tests were conducted in a subsonic wind tunnel from 21.17 to 33 m/s. Drag coefficients were obtained ranging from 1.10 to 0.53, decreasing about 50% over the speed range tested. Flow visualization showed recirculating vortices at the rear that influence drag. Measurement errors for velocity, drag force, and drag coefficient decreased with increasing air speed.
This document discusses various aerodynamic models used to predict the performance of straight-bladed vertical axis wind turbines (VAWTs). It first describes momentum models, including the rotor blade model and single streamtube model. The rotor blade model calculates forces on blade sections, while the streamtube model represents the turbine as an actuator disk. It then introduces the double-multiple streamtube model which divides the swept volume into streamtubes and calculates upstream and downstream induced velocities. The document also discusses experimental wind tunnel tests using laser Doppler velocimetry and pressure sensors on turbine blades to measure velocities and pressures and validate the momentum model calculations.
Abstract This paper presents the design and implementation of a quadcopter capable of payload delivery. A quadcopter is a unique unmanned aerial vehicle which has the capability of vertical take-off and landing. In this design, the quadcopter was controlled wirelessly from a ground control station using radio frequency. It was modeled mathematically considering its attitude and altitude, and a simulation carried out in MATLAB by designing a proportional Integral Derivative (PID) controller was applied to a mathematical model. The PID controller parameters were then applied to the real system. Finally, the output of the simulation and the prototype were compared both in the presence and absence of disturbances. The results showed that the quadcopter was stable and able to compensate for the external disturbances.
IRJET- Seismic Analysis of Curve Cable-Stayed BridgeIRJET Journal
1) The document analyzes the seismic performance of cable-stayed bridges with different horizontal curvatures, ranging from straight to 5 degrees of curvature.
2) Six bridge models were analyzed using the software SAP2000, including a straight bridge and bridges with 1, 2, 3, 4, and 5 degrees of curvature.
3) The results show that base shear, pier displacement, and deck displacement all decreased as curvature increased from straight to 3 degrees, but then increased again from 3 to 5 degrees of curvature. The bridges with intermediate (2-3 degree) curvature demonstrated the best seismic performance.
The Effect of Arm Stiffness on the Elasto-Kinematic Properties of Single-Axle...theijes
The paper is focused on the stiffness analysis of the longitudinal arm of single-axle suspension on elastokinematic behaviour of the vehicle axle which is highly important when considering the handling characteristics related tovehicle safety.The elasto-kinematic behaviour of the axle determines the course of the geometrical parameters of wheel suspension, the toe angle and camber as the function of wheel movement during force loading. This paper presents the complex MBS (Multi-Body Simulation)model of the wheel suspension with nonlinear characteristics of rubber-metal bushings. The model also comprises force elements such as springs, shock absorbers, stops and the transverse stabilizer. The model of flexible arm is implemented in the MBS model using the Craig-Bampton method, which represents a flexible body based on the synthesis of its own modal shapes. Subsequently,elasto-kinematic simulations are performed with the help ofthe computational system Hyperwork. The computational part of the paper presents the results of the elasto-kinematic behaviour of wheel axle for the flexible arm with different sheet metal thicknesses (2, 3 and 4 mm) and different materials (steel and aluminium alloy AlSi7Mg). Individual calculation models are compared to each other and also to the model of suspension with therigidarm. Elasto-kinematic analyses are also validated by the measurement inthe testing stage.
This document analyzes the suspension system of an automobile modeled as a two-degree-of-freedom spring-mass-damper system. Equations of motion were derived using Lagrange's equations and modeled in SIMULINK. Natural frequencies were found to be 5.1 rad/s and 6.5 rad/s. Increasing damping reduced bounce by 3x10-3 m to 1x10-3 m and pitch by 5x10-4 m to less than 1x10-4 m. MATLAB modal analysis verified results and natural frequencies were compared.
The document summarizes a master's thesis that analyzes and develops controllers for a quadcopter. It presents the dynamic equations of the quadcopter and linearizes them. Two backstepping controllers are developed - a simpler one that cannot absorb disturbances, and a more advanced one that can handle disturbances like changes in mass. Both controllers separate attitude from horizontal/vertical position control. The controllers are simulated and compared to evaluate their performance.
Prediction tool for preliminary design assessment of the manoeuvring characte...Enrico Della Valentina
This document describes the development of a prediction tool to assess the manoeuvring characteristics of a twin screw displacement yacht in preliminary design. The tool uses numerical simulations in MARIN's SURSIM software to evaluate how variations in rudder area, position, rate of turn, and metacentric height impact yaw checking, course changing, turning ability, and directional stability. Standard manoeuvres like zigzags and turning circles were simulated across a range of design parameters to provide sensitivity analysis and guidance for design improvement. The results of the simulations are presented and discussed.
This document summarizes a degree project that designed a concept for a single-manned human-powered aircraft to theoretically complete the Kremer International Marathon prize course of flying 42,195 meters in under one hour. The project introduces human-powered flight basics and the prize requirements. It then details the aircraft design process, which included evaluating airfoils, calculating lift and thrust needs. The designed concept aircraft, called Euler One, is presented along with analyses of its aeronynamic properties and propeller. The conclusion is that the prize is theoretically feasible but not economically viable with today's materials costs. Future work could improve the design and potentially lead to a successful prize attempt.
2006 Green Incorporating Pulse to Pulse Motion Effects anto Side Looking Arra...Justin Green
This document presents a technique for incorporating pulse-to-pulse motion effects into side-looking array radar data models. The technique accounts for changes in platform attitude between pulses, which affects the geometry between the radar and targets. It uses coordinate transformations to describe how the platform orientation changes with each pulse. This allows calculation of pulse-dependent parameters like spatial frequency and Doppler, extending the existing radar data model to be sensitive to platform motion. The new motion-sensitive space-time snapshot can then be used to characterize how motion impacts the performance of space-time adaptive processing algorithms.
The formula cars need high tire grip on racing challenge by reducing rolling displacement at corner or
double change lands. In this case study, the paper clarifies some issues related to suspension system with
inerter to reduce displacement and rolling angle under impact from road disturbance on Formula SAE
Car. We propose some new designs, which have an advance for suspension system by improving dynamics.
We optimize design of model based on the minimization of cost functions for roll dynamics, by reducing the
displacement transfer and the energy consumed by the inerter. Base on a passive suspension model that we
carried out quarter-car and half-car model for different parameters which show the benefit of the inerter.
The important advantage of the proposed solution is its integration a new mechanism, the inerter, this
system can increase advance in development and have effects on the vehicle dynamics in stability vehicle.
Bifurcation Analysis of High-Speed Railway Vehicle in a CurveIDES Editor
This paper investigates the bifurcation and limit cycle behavior of a 38 degree-of-freedom model of a high-speed railway vehicle. The model considers longitudinal, lateral, vertical, rolling, pitching and yawing motions. The paper finds that the critical hunting speed decreases with increasing wheel conicity. It also finds that the critical hunting speed and hunting frequency calculated using a linear elastic rail model are higher than those calculated using a nonlinear elastic rail model. Frequency analysis shows the main frequencies from the linear model are higher than the nonlinear model.
The document proposes using model predictive control (MPC) to optimize the trajectory of an unmanned aerial vehicle (UAV) transporting passengers between Berkeley, San Francisco, and Palo Alto. MPC is used to minimize input power while keeping the UAV within a virtual tube around the reference trajectory. Simulation results showed the UAV successfully followed the trajectory between destinations while obeying constraints. Future work could utilize a curvilinear coordinate system and learning MPC to further optimize travel times.
The document discusses dynamic modeling of robot manipulators using the Euler-Lagrange approach. It introduces dynamic models and the direct and inverse problems. The Euler-Lagrange approach is then explained in detail. It involves computing the kinetic and potential energies of each link based on the link masses, centers of mass, moments of inertia, and joint velocities and positions. This allows deriving the dynamic equations of motion for the manipulator.
This document describes a constructive solution for a rotating machine with profiled rotors that can function as either a force machine or work machine. Key points:
- The machine has two counter-rotating profiled rotors inside casings that transport fluid from a suction to discharge connection.
- A mathematical relationship is derived showing that the height of the rotating pistons should equal the rotor radius to maximize efficiency.
- Details are provided on the gear mechanism used to synchronize rotation of the rotors without penetrating shafts.
- Equations are given to calculate the coordinates that define the contour profile of the rotors based on design parameters like rotor radius.
- Tables show example coordinate points used to
Robust Control of a Spherical Mobile RobotIRJET Journal
This document summarizes a research paper about controlling a spherical mobile robot using sliding mode control. It begins with an abstract that describes the challenges of controlling spherical robots due to their underactuated systems. It then provides background on previous control methods for spherical robots. The document presents the kinematic model of a 2-DOF spherical robot and describes how sliding mode control can be used to provide robust control and path following for the robot. It provides the equations for the sliding mode controller design. Finally, it presents simulation results showing the robot following a desired trajectory with minimal tracking error using the sliding mode controller.
This document presents a detailed modelling and analysis of parasitic effects in the dynamics of multi-rotor hovercrafts. It focuses on modelling these effects for a T-configuration tri-rotor hovercraft called a T-Copter. The parasitic effects modelled include air drag moments, tilt reaction moments, precession moments, and various angular acceleration effects like Coriolis and centripetal accelerations. Equations are developed to model these effects based on the hardware configuration and dynamics of the T-Copter system. Experimental data is also used to generate polynomial functions modelling the air drag moments.
Structural Analysis of a Bungalow Reportdouglasloon
Taylor's University Lakeside Campus
School of Architecture, Building & Design
Bachelor of Science (Hons) in Architecture
Building Structures (ARC 2523 / BLD 60103)
Project 2: Structural Analysis of a Bungalow
A Mixed Bi-directional S-curve Acceleration/Deceleration Control Algorithm fo...IJRES Journal
This document presents a mixed bi-directional S-curve acceleration/deceleration control algorithm for continuous line segments in high-speed machining. The algorithm aims to simplify velocity planning calculations and improve machining efficiency by determining the optimal S-curve type (7-period or 5-period) based on the displacement and velocity parameters of each segment. It can classify six cases to identify the S-curve type and calculate the corresponding velocity, acceleration, time and displacement parameters. The algorithm was analyzed through a simulation example to validate it can effectively control velocity changes and avoid mechanical vibration during interpolation of continuous segments.
This document presents the design of a measurement device using accelerometers to analyze the behavior of railroad gladhand assemblies used for connecting air brake hoses. The goal is to help Union Pacific quantify peak forces and torques that cause gladhands to detach during operation. The preliminary design proposes using six 3-axis accelerometers - three placed on each gladhand assembly to record acceleration data, from which forces and torques can be calculated. Key challenges addressed include choosing between accelerometers and torque meters, and determining the optimal accelerometer configuration and placement on the gladhand assembly.
This document contains lecture slides about dynamics and kinematics concepts including curvilinear motion, velocity and acceleration in polar coordinates, and dependent motion analysis. Examples are provided to demonstrate how to relate the motion of connected objects using position, velocity, and acceleration equations in systems with pulleys and ropes. Procedures are outlined for analyzing dependent motion problems involving multiple connected particles moving along rectilinear paths. Specific practice problems are assigned from the textbook at the end.
This document investigates how changing the position of the tool point on the moving platform affects the dynamic performance of a 3RRR planar parallel manipulator. Lagrange-d'Alembert formulation is used to develop the dynamic model. The manipulator's dimensions and parameters remain the same, while only the tool point position is changed. Simulation results show that locating the tool point at an optimal position reduces the generalized forces and energy consumption of the manipulator, improving its dynamic performance.
The researchers used strain gauges to experimentally determine the drag coefficient of a scale model Toyota car. Tests were conducted in a subsonic wind tunnel from 21.17 to 33 m/s. Drag coefficients were obtained ranging from 1.10 to 0.53, decreasing about 50% over the speed range tested. Flow visualization showed recirculating vortices at the rear that influence drag. Measurement errors for velocity, drag force, and drag coefficient decreased with increasing air speed.
This document discusses various aerodynamic models used to predict the performance of straight-bladed vertical axis wind turbines (VAWTs). It first describes momentum models, including the rotor blade model and single streamtube model. The rotor blade model calculates forces on blade sections, while the streamtube model represents the turbine as an actuator disk. It then introduces the double-multiple streamtube model which divides the swept volume into streamtubes and calculates upstream and downstream induced velocities. The document also discusses experimental wind tunnel tests using laser Doppler velocimetry and pressure sensors on turbine blades to measure velocities and pressures and validate the momentum model calculations.
Robots play important roles in day to day
activities of human endeavour and can perform
complex tasks speedily and accurately. Robots are
employed to imitate human behaviours and then
apply these behaviours to the skills that lead to
achieving a certain task in solving the challenges
faced by impaired people in society. This robotic arm
was achieved using light-weight steel iron for the
frames, a moderate torque MG995 Towerpro, and
servo motor. Two Atmega328 Arduino
microcontroller was employed to control the motors
through the use of pulse width modulation
technique. Mathematical models were developed for
the mechanism to represent the kinematics involved
at each joint with mathematical variables. Then, the
stability of the system was carried out using a step
input signal being a type zero system.
1) The document summarizes a simulation of air flow over an airfoil (NACA 0010-35) at various angles of attack using computational fluid dynamics (CFD) in ANSYS.
2) The simulation calculates lift and drag coefficients and determines that maximum lift occurs at an angle of 10 degrees, which is considered the stalling point of the airfoil.
3) The simulation also finds that maximum efficiency, defined as the ratio of lift to drag coefficients, occurs at an angle of 1 degree.
Researchers used strain gauges in a wind tunnel experiment to determine the drag coefficient of a 1:20 scale model Mercedes SEL 300 passenger car. Strain gauges measured bending moments on a cantilever beam as wind speeds up to 33 m/s were applied to the model. Drag coefficients between 0.37 and 0.19 were obtained, decreasing by about 50% as wind speed increased from 21.17 to 33 m/s. Analysis of measurement errors showed they decreased from around 8% to 3% over the same wind speed range. Flow visualization confirmed the formation of trailing vortices behind the model consistent with previous research. The strain gauge method was deemed practical and accurate for estimating automobile drag coefficients.
1. The document describes the process of identifying key parameters for modelling a quadrotor drone.
2. Two custom test rigs were designed to measure the thrust coefficient, torque coefficient, and throttle command relation parameters.
3. Tests were conducted to determine values for the thrust coefficient, torque coefficient, throttle command relation, motor time constant, and mass moments of inertia for different quadrotor components.
4. The identified parameters will be used to accurately represent the quadrotor in simulations for controller design and evaluation.
This document presents a mathematical model and control schemes for a hexacopter unmanned aerial vehicle. It first develops the nonlinear dynamic model of the hexacopter using Newton-Euler equations, including rotor dynamics. It then proposes two control schemes - PID and backstepping controllers - to control the hexacopter's attitude and altitude. Simulation experiments in Simulink are used to evaluate and compare the performance and stability of the two control techniques under possible disturbances.
OPTIMIZATION OF AERODYNAMIC AND STRUCTURAL PERFORMANCES OF A WIND TURBINE BLA...IAEME Publication
The purpose of this study is to optimize the energy efficiency of a wind turbine
blade and reduce its cost. In this paper, we define several optimization targets such as
maximizing Cl / Cd ratio and minimizing the deformation and mass of the blade. To
solve this multi-objectives optimization problem, we used the ant colony heuristic
optimization method on a blade model computed by the BEM and the FEM methods.
The optimization results are compared with the results obtained by the BEM method.
COMPARISON OF RESPONSE TO UNBALANCE OF OVERHUNG ROTOR SYSTEM FOR DIFFERENT SU...IAEME Publication
Rotor unbalance is most common fault found in the rotating machines. Methods
are adopted to analyze the position of unbalance and to bring its effect into acceptablelimit. Vibration analysis is the most common technique used to analyze the rotor
system. Research have been performed on rotor supported atboth ends, however lessstudy has been done for overhung rotor. In this paper the response of overhung rotoron isotropic support and anisotropic support subject tounbalance has been presented.and equations aresolved using MATLAB programming. The effect of unbalancehas been studied on thebode plot. Forward and Reverse whirl are observed through Campbell diagram andmode shapes are plotted.
The effect of rotor disc clearance on the lift performance of contra rotating...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document presents a mathematical model and analysis of the vibration response characteristics of a half car model subjected to different sinusoidal road excitations. The half car model is modeled as a two degree of freedom system, considering bounce and pitch motions. Lagrange's equations are used to derive the governing equations of motion. The natural frequencies of the system are calculated. MATLAB is used to simulate the dynamic response of the vehicle for different road bump amplitudes and vehicle velocities. The results show that vibration amplitude increases with bump amplitude and velocity up to a point, after which amplitude decreases with further increases in velocity.
IRJET- Analyzing Vehicle Handling using BICYCLE MODEL in MATLAB/OCTAVEIRJET Journal
This document presents a mathematical model and simulation of vehicle handling characteristics using a bicycle model in MATLAB/Octave. It begins with an introduction to vehicle handling and the bicycle model approach. Next, it derives the governing equations of motion for the bicycle model and represents them in state space form for simulation. The document then shows MATLAB code and results from simulating a passenger car and F1 race car using a sinusoidal steering input. Key results include Bode plots, step responses, and sine responses of lateral speed, yaw rate, and lateral acceleration. Finally, it compares the passenger car and race car responses, finding that the passenger car model is less stable with greater overshoot.
This work presents the kinematics model of an RA-
02 (a 4 DOF) robotic arm. The direct kinematic problem is
addressed using both the Denavit-Hartenberg (DH) convention
and the product of exponential formula, which is based on the
screw theory. By comparing the results of both approaches, it
turns out that they provide identical solutions for the
manipulator kinematics. Furthermore, an algebraic solution of
the inverse kinematics problem based on trigonometric
formulas is also provided. Finally, simulation results for the
kinematics model using the Matlab program based on the DH
convention are presented. Since the two approaches are
identical, the product of exponential formula is supposed to
produce same simulation results on the robotic arm studied.
Keywords-Robotics; DH convention; product of exponentials;
kinematics; simulations
Analytical solution of the relative orbital motion in unperturbed elliptic or...IRJET Journal
This document presents an analytical solution to the relative orbital motion of two objects (a chief and deputy object) moving in unperturbed elliptic orbits about a central body. It begins by deriving the equations of motion for the deputy object relative to the chief in terms of the true anomaly of the chief's orbit. These equations are then linearized and solved using Laplace transformations, representing the solution in terms of the eccentricity of the chief's orbit and its true anomaly. Finally, the document states that the analytical solution will be applied to a numerical example to validate the approach.
Three-dimensional Streamline Design of the Pump Flow Passage of Hydrodynamic...IJMER
The design methods of three-element, centripetal turbine hydrodynamic torque converters
were investigated. A new design method, three-dimensional streamline design method, was proposed.
Firstly, the three-dimensional central streamline of the flow passage was designed and the streamline
consists of a circular arc and a short straight line segment. After that, the central streamline equation was
obtained and the design path equation was derived. Next, any other meridional flow path can numerically be
obtained. Finally, the three-dimensional streamline corresponding to any meridional flow path was
computed numerically. Investigation results show that the proposed method is feasible and possesses
obvious advantages. First, the curvature radius of the three-dimensional central streamline remains
unchanged, while any other three-dimensional streamline is close to a circular arc as well. Therefore, the
energy losses caused by streamline bending can be reduced. Second, because the fluid particle near the flow
passage outlet flows in a straight line law and the energy losses due to flow deviation can be reduced. Third,
all the three-dimensional streamlines are theoretically located in an identical plane. Thereby energy losses
caused by the turbulence can be reduced. Fourth, because of the flat blades, the manufacture cost of a torque
converter can be reduced.
PSO and SMC based Closed Loop V/F Control of AC Drive using SVPWMIRJET Journal
This document proposes a particle swarm optimization and sliding mode control scheme for V/F control of an induction motor drive. Space vector pulse width modulation is used to control the motor voltage and frequency, reducing total harmonic distortion. Particle swarm optimization is used as the main controller, while sliding mode control provides stability without requiring precise system knowledge. Simulation results in MATLAB validate the effectiveness of the proposed control system in controlling motor speed, current, and torque.
Research paper on indoor drone application with acoustic localization. Paper was accepted to the ISEEE 2019 conference (International Symposium on Electrical and Electronics Engineering).
COMPUTATIONAL FLUID DYNAMIC ANALYSIS OF NACA 0006 AEROFOIL AT DIFFERENT PARAM...IRJET Journal
The document describes a computational fluid dynamics (CFD) analysis of flow over a NACA 0006 airfoil at different wind speeds and angles of attack. A numerical simulation was performed in ANSYS Fluent to analyze incompressible 2D flow over the airfoil profile. Mesh generation and boundary conditions are described for the simulation. Variations in coefficient of lift and drag with changing angle of attack are analyzed to study airflow patterns and aerodynamic forces on the airfoil.
Implementation and assemplingof a small wind turbineRayan Hameed
This document summarizes a student project to assemble and implement a small wind turbine. It includes the following:
1) The project aims to assemble unlabeled wind turbine components in the lab to understand how wind energy is converted to electricity.
2) Challenges include a lack of documentation for the components and difficulties integrating the mechanical parts.
3) A preliminary simulation of the wind turbine system was developed in Simulink to model the rotor dynamics, induction generator, and wind energy conversion process.
4) While the project faced challenges integrating the unlabeled components, it provides an educational opportunity to learn about renewable energy systems.
Similar to IRJET- Four Propellers Submarine Drone Modelling (20)
TUNNELING IN HIMALAYAS WITH NATM METHOD: A SPECIAL REFERENCES TO SUNGAL TUNNE...IRJET Journal
1) The document discusses the Sungal Tunnel project in Jammu and Kashmir, India, which is being constructed using the New Austrian Tunneling Method (NATM).
2) NATM involves continuous monitoring during construction to adapt to changing ground conditions, and makes extensive use of shotcrete for temporary tunnel support.
3) The methodology section outlines the systematic geotechnical design process for tunnels according to Austrian guidelines, and describes the various steps of NATM tunnel construction including initial and secondary tunnel support.
STUDY THE EFFECT OF RESPONSE REDUCTION FACTOR ON RC FRAMED STRUCTUREIRJET Journal
This study examines the effect of response reduction factors (R factors) on reinforced concrete (RC) framed structures through nonlinear dynamic analysis. Three RC frame models with varying heights (4, 8, and 12 stories) were analyzed in ETABS software under different R factors ranging from 1 to 5. The results showed that displacement increased as the R factor decreased, indicating less linear behavior for lower R factors. Drift also decreased proportionally with increasing R factors from 1 to 5. Shear forces in the frames decreased with higher R factors. In general, R factors of 3 to 5 produced more satisfactory performance with less displacement and drift. The displacement variations between different building heights were consistent at different R factors. This study evaluated how R factors influence
A COMPARATIVE ANALYSIS OF RCC ELEMENT OF SLAB WITH STARK STEEL (HYSD STEEL) A...IRJET Journal
This study compares the use of Stark Steel and TMT Steel as reinforcement materials in a two-way reinforced concrete slab. Mechanical testing is conducted to determine the tensile strength, yield strength, and other properties of each material. A two-way slab design adhering to codes and standards is executed with both materials. The performance is analyzed in terms of deflection, stability under loads, and displacement. Cost analyses accounting for material, durability, maintenance, and life cycle costs are also conducted. The findings provide insights into the economic and structural implications of each material for reinforcement selection and recommendations on the most suitable material based on the analysis.
Effect of Camber and Angles of Attack on Airfoil CharacteristicsIRJET Journal
This document discusses a study analyzing the effect of camber, position of camber, and angle of attack on the aerodynamic characteristics of airfoils. Sixteen modified asymmetric NACA airfoils were analyzed using computational fluid dynamics (CFD) by varying the camber, camber position, and angle of attack. The results showed the relationship between these parameters and the lift coefficient, drag coefficient, and lift to drag ratio. This provides insight into how changes in airfoil geometry impact aerodynamic performance.
A Review on the Progress and Challenges of Aluminum-Based Metal Matrix Compos...IRJET Journal
This document reviews the progress and challenges of aluminum-based metal matrix composites (MMCs), focusing on their fabrication processes and applications. It discusses how various aluminum MMCs have been developed using reinforcements like borides, carbides, oxides, and nitrides to improve mechanical and wear properties. These composites have gained prominence for their lightweight, high-strength and corrosion resistance properties. The document also examines recent advancements in fabrication techniques for aluminum MMCs and their growing applications in industries such as aerospace and automotive. However, it notes that challenges remain around issues like improper mixing of reinforcements and reducing reinforcement agglomeration.
Dynamic Urban Transit Optimization: A Graph Neural Network Approach for Real-...IRJET Journal
This document discusses research on using graph neural networks (GNNs) for dynamic optimization of public transportation networks in real-time. GNNs represent transit networks as graphs with nodes as stops and edges as connections. The GNN model aims to optimize networks using real-time data on vehicle locations, arrival times, and passenger loads. This helps increase mobility, decrease traffic, and improve efficiency. The system continuously trains and infers to adapt to changing transit conditions, providing decision support tools. While research has focused on performance, more work is needed on security, socio-economic impacts, contextual generalization of models, continuous learning approaches, and effective real-time visualization.
Structural Analysis and Design of Multi-Storey Symmetric and Asymmetric Shape...IRJET Journal
This document summarizes a research project that aims to compare the structural performance of conventional slab and grid slab systems in multi-story buildings using ETABS software. The study will analyze both symmetric and asymmetric building models under various loading conditions. Parameters like deflections, moments, shears, and stresses will be examined to evaluate the structural effectiveness of each slab type. The results will provide insights into the comparative behavior of conventional and grid slabs to help engineers and architects select appropriate slab systems based on building layouts and design requirements.
A Review of “Seismic Response of RC Structures Having Plan and Vertical Irreg...IRJET Journal
This document summarizes and reviews a research paper on the seismic response of reinforced concrete (RC) structures with plan and vertical irregularities, with and without infill walls. It discusses how infill walls can improve or reduce the seismic performance of RC buildings, depending on factors like wall layout, height distribution, connection to the frame, and relative stiffness of walls and frames. The reviewed research paper analyzes the behavior of infill walls, effects of vertical irregularities, and seismic performance of high-rise structures under linear static and dynamic analysis. It studies response characteristics like story drift, deflection and shear. The document also provides literature on similar research investigating the effects of infill walls, soft stories, plan irregularities, and different
This document provides a review of machine learning techniques used in Advanced Driver Assistance Systems (ADAS). It begins with an abstract that summarizes key applications of machine learning in ADAS, including object detection, recognition, and decision-making. The introduction discusses the integration of machine learning in ADAS and how it is transforming vehicle safety. The literature review then examines several research papers on topics like lightweight deep learning models for object detection and lane detection models using image processing. It concludes by discussing challenges and opportunities in the field, such as improving algorithm robustness and adaptability.
Long Term Trend Analysis of Precipitation and Temperature for Asosa district,...IRJET Journal
The document analyzes temperature and precipitation trends in Asosa District, Benishangul Gumuz Region, Ethiopia from 1993 to 2022 based on data from the local meteorological station. The results show:
1) The average maximum and minimum annual temperatures have generally decreased over time, with maximum temperatures decreasing by a factor of -0.0341 and minimum by -0.0152.
2) Mann-Kendall tests found the decreasing temperature trends to be statistically significant for annual maximum temperatures but not for annual minimum temperatures.
3) Annual precipitation in Asosa District showed a statistically significant increasing trend.
The conclusions recommend development planners account for rising summer precipitation and declining temperatures in
P.E.B. Framed Structure Design and Analysis Using STAAD ProIRJET Journal
This document discusses the design and analysis of pre-engineered building (PEB) framed structures using STAAD Pro software. It provides an overview of PEBs, including that they are designed off-site with building trusses and beams produced in a factory. STAAD Pro is identified as a key tool for modeling, analyzing, and designing PEBs to ensure their performance and safety under various load scenarios. The document outlines modeling structural parts in STAAD Pro, evaluating structural reactions, assigning loads, and following international design codes and standards. In summary, STAAD Pro is used to design and analyze PEB framed structures to ensure safety and code compliance.
A Review on Innovative Fiber Integration for Enhanced Reinforcement of Concre...IRJET Journal
This document provides a review of research on innovative fiber integration methods for reinforcing concrete structures. It discusses studies that have explored using carbon fiber reinforced polymer (CFRP) composites with recycled plastic aggregates to develop more sustainable strengthening techniques. It also examines using ultra-high performance fiber reinforced concrete to improve shear strength in beams. Additional topics covered include the dynamic responses of FRP-strengthened beams under static and impact loads, and the performance of preloaded CFRP-strengthened fiber reinforced concrete beams. The review highlights the potential of fiber composites to enable more sustainable and resilient construction practices.
Survey Paper on Cloud-Based Secured Healthcare SystemIRJET Journal
This document summarizes a survey on securing patient healthcare data in cloud-based systems. It discusses using technologies like facial recognition, smart cards, and cloud computing combined with strong encryption to securely store patient data. The survey found that healthcare professionals believe digitizing patient records and storing them in a centralized cloud system would improve access during emergencies and enable more efficient care compared to paper-based systems. However, ensuring privacy and security of patient data is paramount as healthcare incorporates these digital technologies.
Review on studies and research on widening of existing concrete bridgesIRJET Journal
This document summarizes several studies that have been conducted on widening existing concrete bridges. It describes a study from China that examined load distribution factors for a bridge widened with composite steel-concrete girders. It also outlines challenges and solutions for widening a bridge in the UAE, including replacing bearings and stitching the new and existing structures. Additionally, it discusses two bridge widening projects in New Zealand that involved adding precast beams and stitching to connect structures. Finally, safety measures and challenges for strengthening a historic bridge in Switzerland under live traffic are presented.
React based fullstack edtech web applicationIRJET Journal
The document describes the architecture of an educational technology web application built using the MERN stack. It discusses the frontend developed with ReactJS, backend with NodeJS and ExpressJS, and MongoDB database. The frontend provides dynamic user interfaces, while the backend offers APIs for authentication, course management, and other functions. MongoDB enables flexible data storage. The architecture aims to provide a scalable, responsive platform for online learning.
A Comprehensive Review of Integrating IoT and Blockchain Technologies in the ...IRJET Journal
This paper proposes integrating Internet of Things (IoT) and blockchain technologies to help implement objectives of India's National Education Policy (NEP) in the education sector. The paper discusses how blockchain could be used for secure student data management, credential verification, and decentralized learning platforms. IoT devices could create smart classrooms, automate attendance tracking, and enable real-time monitoring. Blockchain would ensure integrity of exam processes and resource allocation, while smart contracts automate agreements. The paper argues this integration has potential to revolutionize education by making it more secure, transparent and efficient, in alignment with NEP goals. However, challenges like infrastructure needs, data privacy, and collaborative efforts are also discussed.
A REVIEW ON THE PERFORMANCE OF COCONUT FIBRE REINFORCED CONCRETE.IRJET Journal
This document provides a review of research on the performance of coconut fibre reinforced concrete. It summarizes several studies that tested different volume fractions and lengths of coconut fibres in concrete mixtures with varying compressive strengths. The studies found that coconut fibre improved properties like tensile strength, toughness, crack resistance, and spalling resistance compared to plain concrete. Volume fractions of 2-5% and fibre lengths of 20-50mm produced the best results. The document concludes that using a 4-5% volume fraction of coconut fibres 30-40mm in length with M30-M60 grade concrete would provide benefits based on previous research.
Optimizing Business Management Process Workflows: The Dynamic Influence of Mi...IRJET Journal
The document discusses optimizing business management processes through automation using Microsoft Power Automate and artificial intelligence. It provides an overview of Power Automate's key components and features for automating workflows across various apps and services. The document then presents several scenarios applying automation solutions to common business processes like data entry, monitoring, HR, finance, customer support, and more. It estimates the potential time and cost savings from implementing automation for each scenario. Finally, the conclusion emphasizes the transformative impact of AI and automation tools on business processes and the need for ongoing optimization.
Multistoried and Multi Bay Steel Building Frame by using Seismic DesignIRJET Journal
The document describes the seismic design of a G+5 steel building frame located in Roorkee, India according to Indian codes IS 1893-2002 and IS 800. The frame was analyzed using the equivalent static load method and response spectrum method, and its response in terms of displacements and shear forces were compared. Based on the analysis, the frame was designed as a seismic-resistant steel structure according to IS 800:2007. The software STAAD Pro was used for the analysis and design.
Cost Optimization of Construction Using Plastic Waste as a Sustainable Constr...IRJET Journal
This research paper explores using plastic waste as a sustainable and cost-effective construction material. The study focuses on manufacturing pavers and bricks using recycled plastic and partially replacing concrete with plastic alternatives. Initial results found that pavers and bricks made from recycled plastic demonstrate comparable strength and durability to traditional materials while providing environmental and cost benefits. Additionally, preliminary research indicates incorporating plastic waste as a partial concrete replacement significantly reduces construction costs without compromising structural integrity. The outcomes suggest adopting plastic waste in construction can address plastic pollution while optimizing costs, promoting more sustainable building practices.
Rainfall intensity duration frequency curve statistical analysis and modeling...bijceesjournal
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Design and optimization of ion propulsion dronebjmsejournal
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024Sinan KOZAK
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)