This document provides a summary of fighter aircraft avionics and flight instruments. It discusses the basic variables that represent the thermodynamic state of air including density, temperature, and pressure. It then describes key flight instruments such as the altimeter, airspeed indicator, and how the air data computer uses total and static pressure and temperature readings to calculate important flight parameters. The roles of the pitot-static system and various gyroscopic and magnetic instruments are also summarized.
Fighter Aircraft Performance, Part I of two, describes the parameters that affect aircraft performance.
For comments please contact me at solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
This document reviews nonlinear effects that saturate wave amplitude growth in thermoacoustic prime movers. It begins with an introduction to linear theory and basic principles, then discusses nonlinear saturating processes using the example of a ThermoAcoustic Oscillator's dynamics above onset. It concludes that nonlinear effects must be considered to fully understand how thermoacoustic engines operate.
Long Term Performance Prediction of a Borehole and Determination of Optimal T...lynxcem
This document discusses long term performance prediction of boreholes and determining the optimal duration for thermal response tests. It provides information about the ground source heat pump test and research laboratory at Istanbul Technical University, including details of their vertical and horizontal ground heat exchanger facilities. It then presents the analytical model and solution methodology for performing constant temperature thermal response tests and using the results to predict long term borehole performance. Experimental data from a sample test is shown along with the process of fitting the model to determine thermal properties and predict performance over longer time periods. It finds that even a 24 hour test duration provides sufficiently accurate long term predictions.
The document discusses performance analysis of centrifugal compressors and axial flow compressors.
1. It provides equations to calculate pressure ratio and efficiency of centrifugal compressors using parameters like mass flow rate, inlet temperature and pressure.
2. It describes phenomena like surge in compressors and methods to control surge using recycle valves.
3. It compares characteristics of centrifugal and axial flow compressors and notes that axial flow compressors are more efficient though bulkier than centrifugal compressors.
This document contains summaries of common physics equations related to electricity, waves, work, weight, speed, acceleration, energy, force, and transformers. Key equations defined include potential difference equaling current times resistance, power equaling potential difference times current, wave speed equaling frequency times wavelength, work done equaling force applied times distance moved, weight equaling mass times gravitational field strength, average speed equaling distance divided by time, and acceleration equaling change in velocity divided by time taken for the change.
This document provides a summary of fighter aircraft avionics and flight instruments. It discusses the basic variables that represent the thermodynamic state of air including density, temperature, and pressure. It then describes key flight instruments such as the altimeter, airspeed indicator, and how the air data computer uses total and static pressure and temperature readings to calculate important flight parameters. The roles of the pitot-static system and various gyroscopic and magnetic instruments are also summarized.
Fighter Aircraft Performance, Part I of two, describes the parameters that affect aircraft performance.
For comments please contact me at solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
This document reviews nonlinear effects that saturate wave amplitude growth in thermoacoustic prime movers. It begins with an introduction to linear theory and basic principles, then discusses nonlinear saturating processes using the example of a ThermoAcoustic Oscillator's dynamics above onset. It concludes that nonlinear effects must be considered to fully understand how thermoacoustic engines operate.
Long Term Performance Prediction of a Borehole and Determination of Optimal T...lynxcem
This document discusses long term performance prediction of boreholes and determining the optimal duration for thermal response tests. It provides information about the ground source heat pump test and research laboratory at Istanbul Technical University, including details of their vertical and horizontal ground heat exchanger facilities. It then presents the analytical model and solution methodology for performing constant temperature thermal response tests and using the results to predict long term borehole performance. Experimental data from a sample test is shown along with the process of fitting the model to determine thermal properties and predict performance over longer time periods. It finds that even a 24 hour test duration provides sufficiently accurate long term predictions.
The document discusses performance analysis of centrifugal compressors and axial flow compressors.
1. It provides equations to calculate pressure ratio and efficiency of centrifugal compressors using parameters like mass flow rate, inlet temperature and pressure.
2. It describes phenomena like surge in compressors and methods to control surge using recycle valves.
3. It compares characteristics of centrifugal and axial flow compressors and notes that axial flow compressors are more efficient though bulkier than centrifugal compressors.
This document contains summaries of common physics equations related to electricity, waves, work, weight, speed, acceleration, energy, force, and transformers. Key equations defined include potential difference equaling current times resistance, power equaling potential difference times current, wave speed equaling frequency times wavelength, work done equaling force applied times distance moved, weight equaling mass times gravitational field strength, average speed equaling distance divided by time, and acceleration equaling change in velocity divided by time taken for the change.
This document provides physics formulas and constants for various topics in physics including:
1) Mechanics formulas for kinematics, forces, energy, momentum, and more.
2) Electromagnetism formulas for electric fields, circuits, magnetism, and more.
3) Fluid mechanics and thermal physics formulas for pressure, temperature, heat transfer, and more.
4) Waves and optics formulas for waves, reflection, refraction, lenses, and more.
5) Atomic and nuclear physics formulas for quantum mechanics, atomic structure, and more.
The document proposes a reusable lunar lander concept that would reduce costs by reusing the lander for crew rotations rather than abandoning it after each mission. Key elements include a propellant transfer module to provide fuel for lunar orbit insertion and resupply, and deployable lunar outpost modules that can be transported and stored in the lander. The initial flight would use the lander to perform lunar orbit insertion and deploy the first outpost module. Subsequent flights would use the propellant transfer module for orbit insertion while transporting additional outpost modules. The document provides details on the proposed lander design including mass estimates and equipment.
The document outlines the methodology used to calculate wave and wave wind loads on structures. It describes the 9 step process to calculate wave loads using wave theory, wave kinematics, current profiles, the Morison equation, and accounting for buoyant forces. It also describes the 7 step process to calculate wave wind loads accounting for wind speed, section properties, marine growth, ice, shape coefficients, and wind shielding factors.
This relates to a series of posts on Vibration Analysis. The purpose is education of engineers and managers to effectively improve availability, reliability and performance of their manufacturing plants and improve profitability of their business
The document is an instruction manual for an apparatus that can suspend objects from threads to study pendulums and oscillations. It contains:
1) A description of the apparatus parts including a bar, cylinders, mounting plate, and base plate that can be used to suspend objects bifilarly or trifilarly.
2) A summary of theory explaining how the period of a simple pendulum depends only on length and gravity. For objects suspended trifilarly, the moment of inertia can be determined from the period of torsional oscillations.
3) Examples of experiments calculating periods for a bar suspended bifilarly and for a cylinder suspended trifilarly to determine its moment of inertia.
10 fighter aircraft avionics - part iiiSolo Hermelin
This document provides a summary of fighter aircraft avionics across different generations of fighter jets. It discusses the avionics systems of third, fourth, 4.5 and fifth generation fighters. Specific avionics components covered include cockpit displays, communication systems, data entry/control, flight control, navigation, sensors and weapons systems. The document also discusses topics related to aircraft performance, flight instruments, propulsion and aerodynamics as they relate to fighter jet avionics.
Aerodynamics Part I of 3 describes aerodynamics of wings and bodies in subsonic flight.
For comments please contact me at solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
Compensation of time-varying clock-offset in a LBL navigationjournalBEEI
This paper presents compensation of the clock-offset in a long baseline (LBL)navigation. It departs from the existing literature mainly in dealing with a time-varyingclock-offset, i.e. the clock-rate drifts over the time. Specifically, the clock-offsetdynamics are introduced to the ToFs as an autoregressive filter.Subsequently,interactions among the now biased ToFs and the kinematics of an autonomousunderwater vehicle (AUV)–the navigation subject–are represented in a state-spaceform. Implementing the so-called graphic approach, minimum sensor requirementfor this system’s observability is then explicated. Finally, a standard discrete Kalmanfilter is deployed as the state estimator. By simulation, it is demonstrated that theestimator manages to compensate the offset and to provide localization with less than1 m accuracy.
1. Important equations in physics for IGCSE courses include equations for constant motion, acceleration, work, energy, power, density, pressure, waves, light, electricity and more.
2. Key concepts covered include kinematics equations, Newton's laws of motion, energy equations, gas laws, wave properties, optics, electromagnetism, atomic structure and radiation.
3. Over 20 core physics topics are summarized with their most important equations for quick reference in studies for IGCSE physics exams.
This document summarizes a presentation on using the 4th order Runge-Kutta method to model the trajectory of projectiles. It discusses ordinary differential equations, introduces the RK4 method, and applies it to model the trajectory of unguided missiles accounting for gravity and drag forces, as well as guided self-propelled missiles where thrust is also considered. Input parameters for a simulation of a North Korean missile are provided and the optimal range is determined. Limitations of the model and references are also noted.
This document provides a reference guide and formula sheet for physics. It includes over 100 physics formulas organized into sections on vectors, kinematics, dynamics, energy, momentum, rotational motion, fluids, thermodynamics, electricity, magnetism, optics, modern physics, and miscellaneous formulas. The formulas cover topics ranging from weight and density to projectile motion, circular motion, waves, thermodynamics laws, electric circuits, and relativity.
1. The document describes 5 experiments related to mechanical oscillations and vibrations. Experiment 1 verifies the relation between the period of a simple pendulum and its length. Experiment 2 determines the radius of gyration of a compound pendulum.
2. Experiment 3 uses a bifilar suspension to determine the radius of gyration of a bar. Experiment 4 studies longitudinal vibrations of a helical spring and determines the frequency theoretically and experimentally.
3. Experiment 5 examines vibrations of a system with springs in series. Each experiment involves setting up the apparatus, collecting observations in tables, performing calculations, and drawing conclusions by comparing experimental and theoretical results.
The document provides an overview of key physics equations and concepts for Form 4 students, including equations for relative deviation, prefixes, units for area and volume, equations for average speed, velocity, acceleration, momentum, Newton's laws of motion, and impulse. Key terms are defined for important concepts like displacement, time, mass, force, and velocity. Formulas are presented for calculations involving these fundamental physics quantities and relationships.
RADAR - RAdio Detection And Ranging
This is the Part 1 of 2 of RADAR Introduction.
For comments please contact me at solo.hermelin@gmail.com.
For more presentation on different subjects visit my website at http://www.solohermelin.com.
Part of the Figures were not properly downloaded. I recommend viewing the presentation on my website under RADAR Folder.
1) Conventional semblance analysis assumes no amplitude variation with offset (AVO), which can cause issues for events with strong AVO or polarity reversals. 2) The document proposes generalized semblance methods that incorporate AVO by modeling events with both hyperbolic moveout and amplitude variation. 3) It compares traditional, AB, and AK semblance on synthetic data, finding AK semblance maintains good velocity resolution while handling AVO better than traditional semblance.
This document summarizes an experimental investigation of transonic fluid-structure interaction phenomena on a high aspect ratio swept wing. Time-resolved pressure measurements were taken using aluminum foil coated with pressure-sensitive paint on the wing surface. For a weak shock case, spectral analysis showed shock buffeting at 0.72 reduced frequency. A strong shock case exhibited shock oscillation also at 0.73 reduced frequency and higher harmonics. Harmonic forcing experiments showed the flow response depends on amplitude and frequency of oscillations. Local energy exchange was estimated, showing regions of fluid excitation and damping. The results provide insights into unsteady transonic flows and aeroelastic interactions on wings.
This document provides physics formulas and constants for various topics in physics including:
1) Mechanics formulas for kinematics, forces, energy, momentum, and more.
2) Electromagnetism formulas for electric fields, circuits, magnetism, and more.
3) Fluid mechanics and thermal physics formulas for pressure, temperature, heat transfer, and more.
4) Waves and optics formulas for waves, reflection, refraction, lenses, and more.
5) Atomic and nuclear physics formulas for quantum mechanics, atomic structure, and more.
The document proposes a reusable lunar lander concept that would reduce costs by reusing the lander for crew rotations rather than abandoning it after each mission. Key elements include a propellant transfer module to provide fuel for lunar orbit insertion and resupply, and deployable lunar outpost modules that can be transported and stored in the lander. The initial flight would use the lander to perform lunar orbit insertion and deploy the first outpost module. Subsequent flights would use the propellant transfer module for orbit insertion while transporting additional outpost modules. The document provides details on the proposed lander design including mass estimates and equipment.
The document outlines the methodology used to calculate wave and wave wind loads on structures. It describes the 9 step process to calculate wave loads using wave theory, wave kinematics, current profiles, the Morison equation, and accounting for buoyant forces. It also describes the 7 step process to calculate wave wind loads accounting for wind speed, section properties, marine growth, ice, shape coefficients, and wind shielding factors.
This relates to a series of posts on Vibration Analysis. The purpose is education of engineers and managers to effectively improve availability, reliability and performance of their manufacturing plants and improve profitability of their business
The document is an instruction manual for an apparatus that can suspend objects from threads to study pendulums and oscillations. It contains:
1) A description of the apparatus parts including a bar, cylinders, mounting plate, and base plate that can be used to suspend objects bifilarly or trifilarly.
2) A summary of theory explaining how the period of a simple pendulum depends only on length and gravity. For objects suspended trifilarly, the moment of inertia can be determined from the period of torsional oscillations.
3) Examples of experiments calculating periods for a bar suspended bifilarly and for a cylinder suspended trifilarly to determine its moment of inertia.
10 fighter aircraft avionics - part iiiSolo Hermelin
This document provides a summary of fighter aircraft avionics across different generations of fighter jets. It discusses the avionics systems of third, fourth, 4.5 and fifth generation fighters. Specific avionics components covered include cockpit displays, communication systems, data entry/control, flight control, navigation, sensors and weapons systems. The document also discusses topics related to aircraft performance, flight instruments, propulsion and aerodynamics as they relate to fighter jet avionics.
Aerodynamics Part I of 3 describes aerodynamics of wings and bodies in subsonic flight.
For comments please contact me at solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
Compensation of time-varying clock-offset in a LBL navigationjournalBEEI
This paper presents compensation of the clock-offset in a long baseline (LBL)navigation. It departs from the existing literature mainly in dealing with a time-varyingclock-offset, i.e. the clock-rate drifts over the time. Specifically, the clock-offsetdynamics are introduced to the ToFs as an autoregressive filter.Subsequently,interactions among the now biased ToFs and the kinematics of an autonomousunderwater vehicle (AUV)–the navigation subject–are represented in a state-spaceform. Implementing the so-called graphic approach, minimum sensor requirementfor this system’s observability is then explicated. Finally, a standard discrete Kalmanfilter is deployed as the state estimator. By simulation, it is demonstrated that theestimator manages to compensate the offset and to provide localization with less than1 m accuracy.
1. Important equations in physics for IGCSE courses include equations for constant motion, acceleration, work, energy, power, density, pressure, waves, light, electricity and more.
2. Key concepts covered include kinematics equations, Newton's laws of motion, energy equations, gas laws, wave properties, optics, electromagnetism, atomic structure and radiation.
3. Over 20 core physics topics are summarized with their most important equations for quick reference in studies for IGCSE physics exams.
This document summarizes a presentation on using the 4th order Runge-Kutta method to model the trajectory of projectiles. It discusses ordinary differential equations, introduces the RK4 method, and applies it to model the trajectory of unguided missiles accounting for gravity and drag forces, as well as guided self-propelled missiles where thrust is also considered. Input parameters for a simulation of a North Korean missile are provided and the optimal range is determined. Limitations of the model and references are also noted.
This document provides a reference guide and formula sheet for physics. It includes over 100 physics formulas organized into sections on vectors, kinematics, dynamics, energy, momentum, rotational motion, fluids, thermodynamics, electricity, magnetism, optics, modern physics, and miscellaneous formulas. The formulas cover topics ranging from weight and density to projectile motion, circular motion, waves, thermodynamics laws, electric circuits, and relativity.
1. The document describes 5 experiments related to mechanical oscillations and vibrations. Experiment 1 verifies the relation between the period of a simple pendulum and its length. Experiment 2 determines the radius of gyration of a compound pendulum.
2. Experiment 3 uses a bifilar suspension to determine the radius of gyration of a bar. Experiment 4 studies longitudinal vibrations of a helical spring and determines the frequency theoretically and experimentally.
3. Experiment 5 examines vibrations of a system with springs in series. Each experiment involves setting up the apparatus, collecting observations in tables, performing calculations, and drawing conclusions by comparing experimental and theoretical results.
The document provides an overview of key physics equations and concepts for Form 4 students, including equations for relative deviation, prefixes, units for area and volume, equations for average speed, velocity, acceleration, momentum, Newton's laws of motion, and impulse. Key terms are defined for important concepts like displacement, time, mass, force, and velocity. Formulas are presented for calculations involving these fundamental physics quantities and relationships.
RADAR - RAdio Detection And Ranging
This is the Part 1 of 2 of RADAR Introduction.
For comments please contact me at solo.hermelin@gmail.com.
For more presentation on different subjects visit my website at http://www.solohermelin.com.
Part of the Figures were not properly downloaded. I recommend viewing the presentation on my website under RADAR Folder.
1) Conventional semblance analysis assumes no amplitude variation with offset (AVO), which can cause issues for events with strong AVO or polarity reversals. 2) The document proposes generalized semblance methods that incorporate AVO by modeling events with both hyperbolic moveout and amplitude variation. 3) It compares traditional, AB, and AK semblance on synthetic data, finding AK semblance maintains good velocity resolution while handling AVO better than traditional semblance.
This document summarizes an experimental investigation of transonic fluid-structure interaction phenomena on a high aspect ratio swept wing. Time-resolved pressure measurements were taken using aluminum foil coated with pressure-sensitive paint on the wing surface. For a weak shock case, spectral analysis showed shock buffeting at 0.72 reduced frequency. A strong shock case exhibited shock oscillation also at 0.73 reduced frequency and higher harmonics. Harmonic forcing experiments showed the flow response depends on amplitude and frequency of oscillations. Local energy exchange was estimated, showing regions of fluid excitation and damping. The results provide insights into unsteady transonic flows and aeroelastic interactions on wings.
Fixed and fluidized beds are commonly used for reactions, adsorption, and elution processes due to their ability to provide a large surface area for immobilized catalysts or enzymes. This document provides equations for calculating the pressure drop through a fixed bed, which depends on factors like particle properties, flow rate, and fluid viscosity. Pressure drop is determined separately for laminar and turbulent flow regimes using relationships between shear stress, velocity, and hydraulic radius that account for flow occurring between packed particles rather than in a simple tube.
Presentation - Seakeping Numerical Method Taking Into Account the Influence o...Mirel Nechita
1. The document presents a computational method for simulating ship seakeeping that considers fully nonlinear steady wave fields. Mathematical formulations are provided for steady and unsteady potential flow problems.
2. Numerical methods are described, including a desingularized Rankine panel method and a hybrid method combining the panel method and Green function method. The methods are validated against experimental data.
3. Effects of hull form variations are examined for steady wave distributions, hydrodynamic forces, and unsteady wave patterns. The importance of including nonlinear steady wave effects is demonstrated, especially in downstream regions.
This document discusses computational simulations of chaotic systems and the challenges of sensitivity analysis and optimization for such systems. It introduces the concept of Least Squares Shadowing as a solution, which formulates the problem as a least squares problem without an initial condition to avoid the divergence of solutions seen in traditional sensitivity analysis of chaotic systems. Algorithms for solving the Least Squares Shadowing problem are also presented.
EC8553 Discrete time signal processing ssuser2797e4
This document contains a 10 question, multiple choice exam on discrete time signal processing. It covers topics like the discrete Fourier transform (DFT), finite word length effects, fixed point vs floating point representation, and FIR filter design. Specifically, it includes questions that calculate the 4 point DFT of a sequence, define twiddle factors, compare DIT and DIF FFT algorithms, and discuss stability and causality of systems.
DSP_2018_FOEHU - Lec 06 - FIR Filter DesignAmr E. Mohamed
This lecture discusses the design of finite impulse response (FIR) filters. It introduces the window method for FIR filter design, which involves truncating the ideal impulse response with a window function to obtain a causal FIR filter. Common window functions are presented such as rectangular, triangular, Hanning, Hamming, and Blackman windows. These windows trade off main lobe width and side lobe levels. The document provides an example design of a low-pass FIR filter using the Hamming window to meet given passband and stopband specifications.
This thesis investigates the evolution of a turbulent patch created by an oscillating grid in water and dilute polymer solutions. Particle image velocimetry is used to measure the velocity fields. The addition of polymers is found to reduce the growth and decay rates of the patch compared to water. An algorithm is developed to detect the turbulent/non-turbulent interface from vorticity fields. Analysis of the interface, patch area, kinetic energy and entrainment rate coefficient reveals that polymers create a smaller, smoother patch with less energy transfer across the interface. The results provide insight into how polymers modify turbulent entrainment and mixing, with potential applications where localized mixing control is important.
Computation of Hydrodynamic Characteristics of Ships using CFDNabila Naz
1) The document summarizes research using computational fluid dynamics (CFD) to analyze hydrodynamic characteristics like wave patterns, resistance, and pressure around ship hulls.
2) CFD simulations were conducted using the SHIPFLOW software to model potential, boundary layer, and viscous flow around two ship hulls at varying speeds.
3) Results for wave elevation, resistance coefficients, and streamlines showed good agreement with experimental data, though some discrepancies remained, especially near bow and stern.
here is the video for an explanation of this slide ▶ https://youtu.be/QtuhyQ7grWA
Fluid dynamics describes the flow of fluids. Here, we learn about Bernoulli's equation, impulse-momentum equation, venturi meter, orifice meter and so on. This slide is focused for examination purposes, what are all the questions and relevant concepts that can be expected in exams like GATE, ESE, PSUs
The document discusses hydrostatic forces on surfaces submerged in fluids. It defines fluid statics as dealing with fluids at rest, where the only stress is normal stress due to pressure variations from fluid weight. It describes how to calculate the resultant force and center of pressure on plane and curved surfaces for non-uniform pressures. For a plane surface, the resultant force is the pressure at the centroid multiplied by the area. The center of pressure is found by equating moments. Examples are provided to demonstrate these calculations for rectangular plates and cylindrical gates submerged in water.
The document discusses hydrostatic forces on surfaces submerged in fluids. It defines fluid statics as dealing with fluids at rest, where the only stress is normal stress due to pressure variations from fluid weight. It describes how to calculate the resultant force and center of pressure on plane and curved surfaces for non-uniform pressure distributions. For a rectangular plate, the resultant force is the pressure at the centroid multiplied by the area, and the center of pressure is below the centroid. Examples are provided to demonstrate calculating these values.
Naiver strokes equations :- These balance equations arise from applying Issac Newton’s second law to fluid motion , together with assumption that the stress in the fluid is the sum of a diffusing viscous and a pressure term- hence describing viscous flow.
This document discusses fluid statics and hydrostatic forces. It defines key terms like resultant force, center of pressure, and explains how to calculate them for surfaces with non-uniform pressure distributions. Specific examples are given for calculating the resultant force and center of pressure on a submerged rectangular plate and for curved surfaces. Forces on a cylindrical gate hinged at one end are also analyzed.
OMAE2013-10454: Experimental Study on Flow Around Circular Cylinders with Low...Rodolfo Gonçalves
Experiments were carried out in a recirculating water channel regarding the flow around stationary circular cylinders with low aspect ratio piercing the water free surface. Eight different aspect ratios were tested, namely L/D= 0.1, 0.2, 0.3, 0.5, 0.75, 1.0, 1.5 and 2.0; this range corresponds to aspect ratio related to circular offshore systems, such as spar and monocolumn platforms. Force was measured using a six degree-of-freedom load cell and Strouhal number is inferred through the transverse force fluctuation frequency. The range of Reynolds number covers 10,000 < Re < 50,000. PIV measurements were performed in some aspect ratio cases, namely 0.3, 0.5, 1.0 and 2.0 for Reynolds number equal to 43,000. The results showed a decrease in drag force coefficients with decreasing aspect ratio, as well as a decrease in Strouhal number with decreasing aspect ratio. The PIV showed the existence of an arch-type vortex originated in the cylinder free end.
This document provides an overview of basic theory and formulae for small hydro projects. It reviews mathematical fundamentals like area, volume, trigonometry, and algebra. It then covers commonly applied formulae for discharge equations, deflection calculations, and physics of compressed air. The document concludes with the process for sizing a small hydro site, including estimating the flow duration curve and picking the appropriate turbine based on integrating power potential.
The document discusses the design of finite impulse response (FIR) filters. It describes ideal filters and conditions for non-distortion. It then discusses practical considerations for filter design, including the selection of FIR vs infinite impulse response (IIR) filters. The main method covered is the window method for FIR filter design, which involves truncating the ideal impulse response using a window function to reduce ripples. Common window functions like rectangular, Bartlett, Hanning, Hamming, and Blackman are described and compared. An example design using the window method is also provided.
Similar to Numerical Investigation of Flow around an Appended Ship - Svetlozar Neykov - EMSHIP (20)
Svetlozar Neykov is a Bulgarian naval architect with over 10 years of experience in ship structural modeling and design. He has expertise in programs such as Rhinoceros, Ship Constructor, Tribon M3, and AutoCAD. Neykov received a Master's degree in mechanical engineering with a focus on naval architecture. He is proficient in English and has intermediate skills in French and Russian. Neykov's preferred areas of work include CFD optimization, yacht design, and parametric modeling.
This document provides information about a trip from Liege, Belgium to Varna, Bulgaria including key locations and points of interest along the way such as the Rila and Pirin mountains, the Rozen Observatory with its 2 meter mirror, Orpheus Mountain, and Stara Planina. It also mentions a hunt called "Mazalat" near Smolyan City and provides contact information for the trip organizer, reminding travelers to respect nature, use caution in beautiful mountain areas, and think carefully about each step of the journey.
This document provides an overview of China, covering political, economic, and sociocultural factors. Politically, China is ruled by the Communist Party and has a decentralized system with limited democratic processes. Economically, China has experienced rapid growth with an average 10% GDP increase for 30 years, making it the world's second largest economy. Socioculturally, China has a large and growing population that is becoming more urbanized and educated, with rising incomes and consumption.
1) Myanmar, also known as Burma, is located in Southeast Asia and has over 50 ethnic groups, with Buddhism being the dominant religion practiced by 89% of the population.
2) It was formerly a British colony from 1885 to 1948 and experienced a military dictatorship from 1962 to 2011.
3) Some of the major attractions in Myanmar include the Shwedagon Pagoda in Yangon, the pagodas and monasteries in Mandalay, and the ancient city of Bagan with its many Buddhist temples.
Svetlozar Neykov is a Bulgarian mechanical engineer seeking a career in ship design. He has a Master's degree in mechanical engineering from the Technical University of Varna, Bulgaria. His work experience includes 3D ship outfitting at Keppel Fels Baltech Ltd. He has strong technical skills in welding, metal technology, CAD software, and CFD simulation. He is also skilled in Microsoft Office, graphics and web design software. His master's thesis involved numerical simulation of ship hull flow using SHIPFLOW software.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
How to Make a Field Mandatory in Odoo 17Celine George
In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
Numerical Investigation of Flow around an Appended Ship - Svetlozar Neykov - EMSHIP
1. NUMERICAL INVESTIGATION OF FLOW
AROUND AN APPENDED SHIP HULL
EMSHIP master thesis presentation
developed in the frame of the European master course
in “Integrated advanced ship design” named “EMSHIP”
for “European education in advanced ship design”, ref.: 159652-1-2009-1-BE-ERA
MUNDUS-EMMC
Eng. Svetlozar Neykov
Supervisors: Reviewer:
Professor Adrian Lungu Professor Lionel Gentaz
Professor Florin Pacuraru Ecole Centrale de Nantes
University of Galati - "Dunarea de Jos“ February, 2013
3. Introduction
• Main objective: to determine the flow around the fully appended
ship hull, influences exerted by different configurations of the
appendages on the wake structure in the propeller disk on
combatant DTMB 5415
Fig.1: DTMB 5415 Geometry
5. Used software
SHIPFLOW by FLOWTECH International AB with:
•Potential flow theory utilizing Laplace equation combined with
boundary layer theory for estimating the skin friction coefficient and
total resistance.
•Viscous flow theory utilizing RANS (Reynolds Averaged Navier Stokes
equations) for detailed investigation of the flow in the stern region and
zone around the sonar dome of the ship.
7. Preliminary potential flow solution
• Panazlization on the body
Free surface Hull Bulb No Transom Transom
Total
Total number number of Total number Total number
Froude points stau stam stad station point station points of panels nodes points stad of panels of nodes
0.24 45 25 84 61 150 18 5 18 10247 10650 4 61 10427 10894
0.28 43 21 63 54 150 18 5 18 8569 8938 4 54 8728 9154
0.31 43 20 53 50 150 18 5 18 7939 8293 4 50 8086 8493
0.35 42 18 43 47 150 18 5 18 7204 7542 4 47 7342 7730
0.40 43 17 33 43 150 18 5 18 6381 6703 4 43 6507 6875
0.44 43 16 28 41 150 18 5 18 6045 6359 4 41 6165 6523
Potential flow Table with different configurations of grids for different Froude numbers
panalization
8. Preliminary potential flow solution
• Panalization of the free surface generated based on λ = 2π LFn 2
• Example of grids for Fn = [0.24]
Free surface no transom case Free surface with transom case
9. Preliminary potential flow solution
• Example of results for Fn = [0.24]
Free surface computation Pressure distribution
10. Preliminary potential flow solution
• Example of results for Fn = [0.40]
Free surface computation Pressure distribution
11. Preliminary potential flow solution
• Example of results for Fn = [0.24]
Skin friction coefficient for Fn= [0.24]
12. Preliminary potential flow solution
Total Resistance [Rt] in function of Froude number [Fn] Coefficient of wave making resistance [Cw] in function of
Froude number [Fn]
14. Hybrid viscous solution using potential
free surface – grid overall view
Overall view of the grid Perspective view of whole viscous domain
15. Viscous grid in the stern region of the
hull with appendages
Overlapping grid of shaft - green, rudder – orange, ruder Grid around stern part of the ship with appendages
bracket – blue
16. Viscous grid in the sonar dome
region
No refined mesh in sonar region for Fn = 0.28 Refined mesh in sonar region for Fn = 0.28
18. Comparison of the flow results between refined
and non refined grid in the sonar dome region
Pressure results in sonar region for Fn = 0.28 Pressure results in sonar region for Fn = 0.28
no refined, contour levels = 39 refined, contour levels = 39
19. Hybrid viscous solution using potential free
surface – comparison of pressure results
Pressure results at sonar for Fn = 0.28 bare Pressure results in aft region for Fn =
hull 0.28 bare hull
Pressure results in aft region
for Fn = 0.28 hull with rudder,
bracket and shaft
Pressure results at sonar for Fn = 0.41 bare Pressure results at ship aft region for
hull Fn = 0.41 bare hull
20. Hybrid viscous solution using potential free
surface – comparison of axial velocity results
Axial velocity results in sonar region for Fn = Axial velocity results at ship stern Axial velocity results at ship
0.28 bare hull region for Fn = 0.28 bare hull stern region for Fn = 0.28
bare hull with rudder,
bracket and shaft
Axial velocity results in sonar region for Axial velocity results at ship stern
Fn = 0.41 bare hull region for Fn = 0.41 bare hull
21. Comparison between pressure of appended solutions and
appended with propeller with two different Fn around the
propeller disk region
Pressure distribution around the hull at Fn = 0.28 Pressure distribution around the hull at Fn = 0.41
with appendages and propeller with appendages and propeller
22. Comparison between axial velocity of appended solutions and
appended with propeller with two different Fn around the
propeller disk region
Axial velocity around hull and appendages at Fn = 0.28 no propeller -
slice on rudder shaft
Axial velocity around hull and appendages at Fn = 0.28 propeller Axial velocity around hull and appendages at Fn = 0.41 propeller -
slice on rudder shaft slice on rudder shaft
23. Comparison of axial velocities on the propeller plane at Fn=0.28
Axial velocity at the propeller slice x=0.95 Axial velocity at the propeller slice x=0.95 Axial velocity at the propeller slice x=0.95
at Fn=0.28 – bare hull at Fn=0.28 - hull with appendages at Fn=0.28 - hull with appendages and
propeller
The strong contra rotating vortexes created from the sonar dome traveling through the ship’s hull interfere with appendages
and the addition of the propeller actuator disks further complicates the axial velocity distribution.
24. Accuracy of the solution is around 3% for most of
the cases of potential flow solution except Fn=0.35
General Table of the resistance under potential flow
Case 1 Case 2
Experimental No transom Transom
Speed Froud % difference from % difference from
=Fn.sqrt(gL) e results [N] Value Experimental data Value Experimental data
0.24 1.93%
1.76 30.6 31.2 35.0 14.51%
0.28 -2.12%
2.07 44.3 43.4 49.3 11.10%
0.31 -2.69%
2.29 57.9 56.3 63.3 9.32%
0.35 5.52%
2.59 78.1 73.6 -5.81% 82.4
0.40 3.03%
2.99 135.3 127.8 -5.53% 139.4
0.44 -0.02%
3.30 196.7 184.5 -6.20% 196.6
25. Found workarounds and reported bugs in
SHIPFLOW Software
• Found bugs which break the solution at certain Froude numbers
in the software and reported to the support team of SHIPFLOW
version 4.6.00-x86_64.
•A workaround of the problematic Froude numbers was found
with inserting dummy values after wanted Froude numbers get
from experimental results. This gives correct solution for
potential flow with XBound and later it can be used for viscous
computation. Example:
vshi(fn=[0.350032],rn=[1.04e+007])
/instead of vshi(fn=[0.35],rn=[1.04e+007])
Gives good solution for Xbound and CF – skin friction coefficient.
26. Found workarounds and reported bugs in
SHIPFLOW Software
•Other problem with “BRACKET” command was found with the using of
section option, which blocks the software and it was also reported, and
confirmed from the support team of SHIPFLOW FLOWTECH software. This
error will be fixed for next version of the software product and workaround
for now is to use “RUDDER” command with replacement of “from” and “to”
to “span” and “origin” and for the angle is used ANGLE, CANT and TILT.
•Example:
rudder ( id="ax_carma", s=[0,1], c=[0.01488,0.01488], span=0.085837,
dimension=[51,51,48], orig=[5.5640,0.1248,0.134163], rmax=1.6, section=["ax"])
/ Instead of brack ( id="ax_carma", s=[0,1], c=[0.01488,0.01488], dimension=[51,51,48],
/ from=[5.5640,0.1248,0.134163], to=[5.5640,0.1248,0.22], rmax=1.6,
/ section="ax") gives good results for simulating hull with appendage bracket
•Allgood results and also bad are reported to support team of the software
product with great appreciation of their help.
28. Conclusion
• SHIPFLOW software captures well the main structures and characteristics
of the flow in complex hulls with appendages and predicts total resistance
allowing towing tank alternative.
• Results for combatant benchmark case were capturing reasonably well the
free surface wave elevation with main Kelvin wake pattern developed by the
hull.
• Potential flow theory determined the free surface elevation successfully,
and it is used as a starting point for further investigation with viscous flow
theory. Observation during the simulation is to use for free surface elevation
computation the cases without transom for smaller Froude numbers, and
cases with transom for bigger Froude numbers. This gives less than 3%
deviation from the experimental data except for the Froude number 0.35,
there the deviation is around 6%.
29. Conclusion
• Hybridmethodology allows incorporating free surface
flow solution from potential flow into viscous flow
computation.
• Viscous computation of the software helps
understanding of interferences between developing
vortexes from the sonar dome and the complicated
interactions at the stern region of the ship.
30. CFD has future in the ship research problems.
Quotes:
“There should be no such thing as boring mathematics. ” - Edsger Dijkstra
“Do not worry about your difficulties in mathematics. I can assure you mine are still
greater.” - Albert Einstein
Thank you for the attention!
Svetlozar Neykov (sinmania@abv.bg)