This document presents the results of a modal and harmonic analysis of a tapered composite I-beam with its big end fixed and small end free. The natural frequencies and mode shapes are investigated for various fiber orientations in the top and bottom flanges and web of the beam, as well as different modulus ratios. The natural frequencies are found to increase with increasing fiber angle and modulus ratio. Harmonic analysis applying a 1N load at the free end shows the displacement decreases with increasing natural frequency for different fiber angles and modulus ratios.
The document discusses techniques for measuring the tensile properties of individual wood flour particles embedded in a polymer matrix. Specifically, it examines applying short fiber composite theory to wood-plastic composites. The key points covered include:
1) Preparing wood-plastic composite samples with wood flour particles and measuring their strain distribution using optical methods and modeling.
2) Comparing the strain measurements around embedded particles to predictions from short fiber composite theory and morphology-based material point modeling.
3) Troubleshooting challenges with the optical strain measurements, such as apparent negative strains, and exploring using 3D digital image correlation to directly measure strain on individual wood particles.
Isaf2007 Presentation Bst Ito Funakubo KoutsaroffIvo Koutsaroff
1. The document discusses the effect of strain from the substrate on the tunability of (100) one-axis oriented (Ba0.5Sr0.5)TiO3 thin films.
2. (Ba,Sr)TiO3 films were prepared on substrates with different thermal expansion coefficients to induce varying degrees of tensile and compressive strain. The dielectric properties of the films were then characterized.
3. The results showed that the relative dielectric constant and tunability of the films increased with compressive strain and decreased with tensile strain, consistent with expectations based on thermal strain calculations and previous literature.
The document describes two MRI phantoms recommended by the AAPM for evaluating MRI system performance:
1. The 3DRAS phantom contains resolution inserts and slice thickness ramps to test spatial resolution, slice thickness, position and separation.
2. The UAL phantom contains uniformity inserts to test image uniformity and linearity inserts to test spatial distortion.
3. The phantoms are designed for quick, convenient testing of key MRI parameters including resolution, artifacts, uniformity and geometry.
This document provides information about an MRI multi-purpose phantom, including:
1. The phantom contains sections to evaluate slice thickness uniformity, magnetic field homogeneity, RF uniformity, and T1 and T2 values.
2. Imaging parameters like echo time, number of slices, and slice thickness should match typical clinical sequences for daily quality assurance.
3. The phantom can be filled with any NMR signal-producing solution, such as a 0.1 millimolar manganese chloride solution, which has a T1 value of around 500 msec.
This summary provides the key points in 3 sentences:
The document discusses polarization errors in fiber optic gyroscopes that use fiber ring interferometers. It shows that applying polarizing fibers at the input and in the sensing coil can significantly suppress polarization errors. Using polarizing fibers at both locations can radically reduce errors by suppressing interfering polarization modes before they propagate through the sensing coil.
New optical w fiber panda for fiber optic gyroscope sensitive coilKurbatov Roman
This document proposes a new type of optical fiber called a W-fiber Panda that could improve fiber optic gyroscopes. The fiber has a core with nitrogen doping surrounded by stress-applying rods that create birefringence. Testing showed a polarizing version had 3 dB/km x-mode losses and 30 dB/km dichroism, while a polarization-maintaining version had ultra-low losses of 0.35 dB/km. This new fiber combines advantages of existing fibers by allowing a wide single-polarization spectral window as well as a desired mode field diameter. Its low losses could enable longer or more sensitive fiber optic gyroscope coils.
The document summarizes research characterizing the morphology of poly methyl methacrylate (PMMA) powder for use as a metal coating material. Both macroscopic and microscopic characterization techniques were used. X-ray diffraction testing showed that the PMMA powder exhibited broad peaks, indicating an amorphous structure. Fourier transform infrared spectroscopy analysis found peaks confirming the presence of PMMA and absence of impurities. The amorphous structure and lack of impurities suggest PMMA is suitable for use as a metal coating.
1) Indentation-induced failure of hard coatings is modeled using cohesive surfaces to represent interfacial delamination and coating cracking under normal and shear loads.
2) Results show that shear delamination occurs within the film along a shear plane, while normal delamination separates the film from the substrate.
3) Coating cracking is also observed radially around the indentation with high tensile stresses concentrated at the coating/substrate interface.
The document discusses techniques for measuring the tensile properties of individual wood flour particles embedded in a polymer matrix. Specifically, it examines applying short fiber composite theory to wood-plastic composites. The key points covered include:
1) Preparing wood-plastic composite samples with wood flour particles and measuring their strain distribution using optical methods and modeling.
2) Comparing the strain measurements around embedded particles to predictions from short fiber composite theory and morphology-based material point modeling.
3) Troubleshooting challenges with the optical strain measurements, such as apparent negative strains, and exploring using 3D digital image correlation to directly measure strain on individual wood particles.
Isaf2007 Presentation Bst Ito Funakubo KoutsaroffIvo Koutsaroff
1. The document discusses the effect of strain from the substrate on the tunability of (100) one-axis oriented (Ba0.5Sr0.5)TiO3 thin films.
2. (Ba,Sr)TiO3 films were prepared on substrates with different thermal expansion coefficients to induce varying degrees of tensile and compressive strain. The dielectric properties of the films were then characterized.
3. The results showed that the relative dielectric constant and tunability of the films increased with compressive strain and decreased with tensile strain, consistent with expectations based on thermal strain calculations and previous literature.
The document describes two MRI phantoms recommended by the AAPM for evaluating MRI system performance:
1. The 3DRAS phantom contains resolution inserts and slice thickness ramps to test spatial resolution, slice thickness, position and separation.
2. The UAL phantom contains uniformity inserts to test image uniformity and linearity inserts to test spatial distortion.
3. The phantoms are designed for quick, convenient testing of key MRI parameters including resolution, artifacts, uniformity and geometry.
This document provides information about an MRI multi-purpose phantom, including:
1. The phantom contains sections to evaluate slice thickness uniformity, magnetic field homogeneity, RF uniformity, and T1 and T2 values.
2. Imaging parameters like echo time, number of slices, and slice thickness should match typical clinical sequences for daily quality assurance.
3. The phantom can be filled with any NMR signal-producing solution, such as a 0.1 millimolar manganese chloride solution, which has a T1 value of around 500 msec.
This summary provides the key points in 3 sentences:
The document discusses polarization errors in fiber optic gyroscopes that use fiber ring interferometers. It shows that applying polarizing fibers at the input and in the sensing coil can significantly suppress polarization errors. Using polarizing fibers at both locations can radically reduce errors by suppressing interfering polarization modes before they propagate through the sensing coil.
New optical w fiber panda for fiber optic gyroscope sensitive coilKurbatov Roman
This document proposes a new type of optical fiber called a W-fiber Panda that could improve fiber optic gyroscopes. The fiber has a core with nitrogen doping surrounded by stress-applying rods that create birefringence. Testing showed a polarizing version had 3 dB/km x-mode losses and 30 dB/km dichroism, while a polarization-maintaining version had ultra-low losses of 0.35 dB/km. This new fiber combines advantages of existing fibers by allowing a wide single-polarization spectral window as well as a desired mode field diameter. Its low losses could enable longer or more sensitive fiber optic gyroscope coils.
The document summarizes research characterizing the morphology of poly methyl methacrylate (PMMA) powder for use as a metal coating material. Both macroscopic and microscopic characterization techniques were used. X-ray diffraction testing showed that the PMMA powder exhibited broad peaks, indicating an amorphous structure. Fourier transform infrared spectroscopy analysis found peaks confirming the presence of PMMA and absence of impurities. The amorphous structure and lack of impurities suggest PMMA is suitable for use as a metal coating.
1) Indentation-induced failure of hard coatings is modeled using cohesive surfaces to represent interfacial delamination and coating cracking under normal and shear loads.
2) Results show that shear delamination occurs within the film along a shear plane, while normal delamination separates the film from the substrate.
3) Coating cracking is also observed radially around the indentation with high tensile stresses concentrated at the coating/substrate interface.
This document summarizes a study that used computational fluid dynamics (CFD) to analyze vortex induced vibration on an offshore structure through fluid-structure interaction (FSI) modeling. The study performed 2D and 3D CFD analyses to understand flow patterns and validate results. Preliminary one-way FSI analysis was then conducted by coupling structural and fluid solvers to observe the dynamic response of the structure to periodically varying vortex loads. The goal was to better understand vortex induced loads on offshore structures through numerical simulation.
This document outlines a capstone project for a PCI Big Beam competition involving the design of pre-stressed concrete beams. A team of engineering students will study pre-stressed concrete concepts, design concrete mixes, and model one beam for the competition and two beams for their capstone project. They will also create a design spreadsheet and test the beams to compare predictions to experimental results. The document describes the competition criteria including design accuracy, cost, deflections, and predictions, as well as preliminary beam designs, timeline, and reflections on learning objectives.
The team designed and tested a prestressed concrete beam for the Big Beam competition. They designed the beam according to the competition requirements, using an inverted T-beam cross-section. They fabricated and tested the beam, finding that it cracked at 22 kips and reached its peak load of 36.1 kips before failing due to crushing of the concrete. The team learned about prestressed design, construction, and testing through their participation.
Spring 2015 problems for the course Rak-43.3110 Prestressed and precast concrete structures, Aalto University, Department of Civil and Structural Engineering. European standards EN 1990 and EN 1992-1-1 has been applied in the problems.
Parametric instability of tapered beam by Finite Element Method SUDIPTA CHAKRABORTY
‘Google Scholar Alerts informed that my paper "Parametric instability of tapered beams by finite element method", the extract of my 1st M. Tech Thesis co-authored with my guide Prof. P. K. Datta of Aerospace Engg Deptt at IIT, Kharagpur which was published in Journal Of Mechanical Engineering Science, London in December, 1982 has been cited and referred even after about 34 years, in the MSc Thesis of K Van Leeuwe at Technical University, Delft, Netherlands, during its defense presentation on 5th April ,2016. [Reference 16 in the Bibliography ] "Identification of parametric resonances in a geometrically exact model of a rotating blade" by K Van Leeuwe – 2016.
This document summarizes finite element analyses performed on a rail crane platform and wind turbine. For the rail crane, static structural analyses were conducted to analyze stress and deformation on wheels under different loading and contact conditions. A thermal analysis determined temperature distribution and additional stresses on wheels over time. For the wind turbine, static loads representing real forces were applied to a blade, and modal and harmonic response analyses examined the structure's natural frequencies and response to vibrational loads.
Free Vibration Analysis of circular plates with holes and cutoutsIOSR Journals
Circular plates with holes are extensively used in mechanical components. The existence of a hole
in a circular plate results in a significant change in the natural frequencies and mode shapes of the structure.
Especially if the hole is located eccentrically, the vibration behavior of these structures is expected to deviate
significantly from that of a plate with a concentric hole. These holes usually cause the change of natural
frequency as well as the decrease of load carrying capacity. It is important to comprehend the associated effects
in the work of mechanical design or flight control of the structure. Therefore, in this study, an experimental
method to determine the modal characteristics of a plate with multiple holes and slots are used is verified by the
finite element analysis (FEA) with ANSYS. Also, the relationship between parameter variations and vibration
modes is investigated. These results can be used as guidance for the modal analysis and damage detection of a
circular plate with a hole.
The document presents the design of a post-tensioned prestressed concrete tee beam and slab bridge deck. Key details include:
- The bridge will have an effective span of 30m and width of 7.5m with 600mm kerbs and 1.5m footpaths on each side.
- The project team will design the bridge to meet Class AA loading standards for a national highway.
- The bridge will have 4 main girders spaced at 2.5m intervals with a 250mm thick deck slab cast between them.
- The document outlines the design process for the interior slab panel, longitudinal girders, and calculation of design moments and shear forces. Properties of the main girder cross
This document describes a modal analysis workshop problem to find the first five natural frequencies and mode shapes of a flat rectangular plate with fixed-free boundary conditions. It provides the model dimensions and material properties, describes generating a finite element model in MSC/Nastran with shell elements, applying boundary conditions to one edge, and performing a normal modes analysis to obtain the natural frequencies and mode shapes. The objective is to have students manually create the finite element input file to model the plate and complete the modal analysis.
This document provides a design summary for Bridge 205 of the I-35W Extension Project. The project involved designing pre-tensioned prestressed concrete girders for the seven spans of the bridge using PGSuper software. Span 2, the longest at 230.58 feet, required 15 Tx70 girders to meet stress limits, while the other spans used mostly 5 Tx54 girders, except Span 4 which used 5 Tx70 girders. Analysis was performed for moments, shears, stresses, deflections and other limit states. Design details such as mild steel reinforcement, girder schedules, and shop drawings are provided to summarize the project.
Numerical parametric study on interval shift variation in simo sstd technique...eSAT Journals
This document presents a parametric study on the time shift interval variation in the SIMO-SSTD technique for experimental modal analysis. The SSTD (Single Station Time Domain) technique extracts modal parameters from free decay responses without using Fourier transforms. The study investigates the accuracy of natural frequency and damping ratio results from the SSTD algorithm when using different time shift intervals between data matrices. Simulated data with known modal properties is used to calculate percentage errors for different shift intervals and noise levels. The goal is to determine the effect of time shift interval on the accuracy of the SSTD technique.
Operational Modal Analysis Implementation on a Hybrd Composite PlateHazira Haidzir
This document discusses modal analysis techniques for predicting structural deformation in aerospace structures due to airflow. It compares experimental modal analysis (EMA), which uses artificial excitation, to operational modal analysis (OMA), which extracts modal properties from operational response only. The study implemented OMA on a composite plate using a laser vibrometer for contactless response measurement. OMA results matched an EMA analysis using impact testing, validating the technique. OMA avoids complex artificial excitation and represents actual operating conditions.
This document discusses continuous beam design in civil engineering. It defines a continuous beam as a statically indeterminate multi-span beam supported by hinges. Continuous beams are made to increase structural integrity by connecting spans over supports. Advantages include reduced member size, but disadvantages include increased friction loss and difficulty achieving continuity in precast elements. Methods for analyzing continuous beams include determining resisting moments and using load balancing techniques. Cable layouts and profiles are also discussed for prestressing tendons in simple, pretensioned, post-tensioned, cantilever, and continuous beams.
Example: Modal analysis using DIgSILENT PowerFactory. This example shows the application modal analysis with Power Factory to P.M. Anderson Test System
This document provides an overview of modal analysis, including:
1) Modal analysis determines a structure's natural frequencies, mode shapes, and mode participation factors. It is the most fundamental dynamic analysis type.
2) The main steps in a modal analysis using ANSYS are building the model, choosing analysis options such as the mode extraction method, applying boundary conditions, and solving for the modes.
3) Key concepts discussed include various mode extraction methods such as Block Lanczos, normalization of mode shapes, and ensuring mode shapes are expanded if needed for subsequent analyses.
This document summarizes the structural analysis of an office building performed using SAP2000 and ETABS models. Modal, seismic, and component analyses were conducted considering dead, live, wind, snow, and seismic loads based on Eurocode standards. Results from the SAP2000 and ETABS models are presented for modal frequencies, relative displacements under seismic loading from the Santa Monica earthquake in both horizontal directions, as well as analyses of girders, walls, stairs, ramps, and slabs.
The document discusses various theories of failure that are used to determine the safe dimensions of components under combined loading conditions. It describes five theories: (1) Maximum principal stress theory, (2) Maximum principal strain theory, (3) Maximum strain energy theory, (4) Maximum distortion energy theory, and (5) Maximum shear stress theory. The maximum distortion energy theory provides the safest design for ductile materials as it results in the largest allowable stresses before failure compared to the other theories. The document also compares the various theories and discusses when each is best applied depending on the material type and stress conditions.
Response Spectrum Modal Analysis of Buildings using SpreadsheetsIJMER
The document describes how to perform response spectrum modal analysis of buildings using spreadsheets. It discusses the key steps in the analysis procedure according to Indian code IS 1893-2002, including calculating modal mass, modal participation factors, design lateral forces at each floor for each mode, storey shear forces for each mode, and combining results using SRSS and CQC methods. It then presents the development of a spreadsheet tool to automate the analysis process and make it simpler to perform. The spreadsheet allows the user to input parameters like building properties, mode shapes, and performs the calculations to determine design base shear and lateral floor forces according to the specified methods.
every one should inculcate the habit of Cow feeding. the brief description of feeding cows with different pulses to over come problems in life. pl forward this to ur friends and needy.
This document summarizes a study that used computational fluid dynamics (CFD) to analyze vortex induced vibration on an offshore structure through fluid-structure interaction (FSI) modeling. The study performed 2D and 3D CFD analyses to understand flow patterns and validate results. Preliminary one-way FSI analysis was then conducted by coupling structural and fluid solvers to observe the dynamic response of the structure to periodically varying vortex loads. The goal was to better understand vortex induced loads on offshore structures through numerical simulation.
This document outlines a capstone project for a PCI Big Beam competition involving the design of pre-stressed concrete beams. A team of engineering students will study pre-stressed concrete concepts, design concrete mixes, and model one beam for the competition and two beams for their capstone project. They will also create a design spreadsheet and test the beams to compare predictions to experimental results. The document describes the competition criteria including design accuracy, cost, deflections, and predictions, as well as preliminary beam designs, timeline, and reflections on learning objectives.
The team designed and tested a prestressed concrete beam for the Big Beam competition. They designed the beam according to the competition requirements, using an inverted T-beam cross-section. They fabricated and tested the beam, finding that it cracked at 22 kips and reached its peak load of 36.1 kips before failing due to crushing of the concrete. The team learned about prestressed design, construction, and testing through their participation.
Spring 2015 problems for the course Rak-43.3110 Prestressed and precast concrete structures, Aalto University, Department of Civil and Structural Engineering. European standards EN 1990 and EN 1992-1-1 has been applied in the problems.
Parametric instability of tapered beam by Finite Element Method SUDIPTA CHAKRABORTY
‘Google Scholar Alerts informed that my paper "Parametric instability of tapered beams by finite element method", the extract of my 1st M. Tech Thesis co-authored with my guide Prof. P. K. Datta of Aerospace Engg Deptt at IIT, Kharagpur which was published in Journal Of Mechanical Engineering Science, London in December, 1982 has been cited and referred even after about 34 years, in the MSc Thesis of K Van Leeuwe at Technical University, Delft, Netherlands, during its defense presentation on 5th April ,2016. [Reference 16 in the Bibliography ] "Identification of parametric resonances in a geometrically exact model of a rotating blade" by K Van Leeuwe – 2016.
This document summarizes finite element analyses performed on a rail crane platform and wind turbine. For the rail crane, static structural analyses were conducted to analyze stress and deformation on wheels under different loading and contact conditions. A thermal analysis determined temperature distribution and additional stresses on wheels over time. For the wind turbine, static loads representing real forces were applied to a blade, and modal and harmonic response analyses examined the structure's natural frequencies and response to vibrational loads.
Free Vibration Analysis of circular plates with holes and cutoutsIOSR Journals
Circular plates with holes are extensively used in mechanical components. The existence of a hole
in a circular plate results in a significant change in the natural frequencies and mode shapes of the structure.
Especially if the hole is located eccentrically, the vibration behavior of these structures is expected to deviate
significantly from that of a plate with a concentric hole. These holes usually cause the change of natural
frequency as well as the decrease of load carrying capacity. It is important to comprehend the associated effects
in the work of mechanical design or flight control of the structure. Therefore, in this study, an experimental
method to determine the modal characteristics of a plate with multiple holes and slots are used is verified by the
finite element analysis (FEA) with ANSYS. Also, the relationship between parameter variations and vibration
modes is investigated. These results can be used as guidance for the modal analysis and damage detection of a
circular plate with a hole.
The document presents the design of a post-tensioned prestressed concrete tee beam and slab bridge deck. Key details include:
- The bridge will have an effective span of 30m and width of 7.5m with 600mm kerbs and 1.5m footpaths on each side.
- The project team will design the bridge to meet Class AA loading standards for a national highway.
- The bridge will have 4 main girders spaced at 2.5m intervals with a 250mm thick deck slab cast between them.
- The document outlines the design process for the interior slab panel, longitudinal girders, and calculation of design moments and shear forces. Properties of the main girder cross
This document describes a modal analysis workshop problem to find the first five natural frequencies and mode shapes of a flat rectangular plate with fixed-free boundary conditions. It provides the model dimensions and material properties, describes generating a finite element model in MSC/Nastran with shell elements, applying boundary conditions to one edge, and performing a normal modes analysis to obtain the natural frequencies and mode shapes. The objective is to have students manually create the finite element input file to model the plate and complete the modal analysis.
This document provides a design summary for Bridge 205 of the I-35W Extension Project. The project involved designing pre-tensioned prestressed concrete girders for the seven spans of the bridge using PGSuper software. Span 2, the longest at 230.58 feet, required 15 Tx70 girders to meet stress limits, while the other spans used mostly 5 Tx54 girders, except Span 4 which used 5 Tx70 girders. Analysis was performed for moments, shears, stresses, deflections and other limit states. Design details such as mild steel reinforcement, girder schedules, and shop drawings are provided to summarize the project.
Numerical parametric study on interval shift variation in simo sstd technique...eSAT Journals
This document presents a parametric study on the time shift interval variation in the SIMO-SSTD technique for experimental modal analysis. The SSTD (Single Station Time Domain) technique extracts modal parameters from free decay responses without using Fourier transforms. The study investigates the accuracy of natural frequency and damping ratio results from the SSTD algorithm when using different time shift intervals between data matrices. Simulated data with known modal properties is used to calculate percentage errors for different shift intervals and noise levels. The goal is to determine the effect of time shift interval on the accuracy of the SSTD technique.
Operational Modal Analysis Implementation on a Hybrd Composite PlateHazira Haidzir
This document discusses modal analysis techniques for predicting structural deformation in aerospace structures due to airflow. It compares experimental modal analysis (EMA), which uses artificial excitation, to operational modal analysis (OMA), which extracts modal properties from operational response only. The study implemented OMA on a composite plate using a laser vibrometer for contactless response measurement. OMA results matched an EMA analysis using impact testing, validating the technique. OMA avoids complex artificial excitation and represents actual operating conditions.
This document discusses continuous beam design in civil engineering. It defines a continuous beam as a statically indeterminate multi-span beam supported by hinges. Continuous beams are made to increase structural integrity by connecting spans over supports. Advantages include reduced member size, but disadvantages include increased friction loss and difficulty achieving continuity in precast elements. Methods for analyzing continuous beams include determining resisting moments and using load balancing techniques. Cable layouts and profiles are also discussed for prestressing tendons in simple, pretensioned, post-tensioned, cantilever, and continuous beams.
Example: Modal analysis using DIgSILENT PowerFactory. This example shows the application modal analysis with Power Factory to P.M. Anderson Test System
This document provides an overview of modal analysis, including:
1) Modal analysis determines a structure's natural frequencies, mode shapes, and mode participation factors. It is the most fundamental dynamic analysis type.
2) The main steps in a modal analysis using ANSYS are building the model, choosing analysis options such as the mode extraction method, applying boundary conditions, and solving for the modes.
3) Key concepts discussed include various mode extraction methods such as Block Lanczos, normalization of mode shapes, and ensuring mode shapes are expanded if needed for subsequent analyses.
This document summarizes the structural analysis of an office building performed using SAP2000 and ETABS models. Modal, seismic, and component analyses were conducted considering dead, live, wind, snow, and seismic loads based on Eurocode standards. Results from the SAP2000 and ETABS models are presented for modal frequencies, relative displacements under seismic loading from the Santa Monica earthquake in both horizontal directions, as well as analyses of girders, walls, stairs, ramps, and slabs.
The document discusses various theories of failure that are used to determine the safe dimensions of components under combined loading conditions. It describes five theories: (1) Maximum principal stress theory, (2) Maximum principal strain theory, (3) Maximum strain energy theory, (4) Maximum distortion energy theory, and (5) Maximum shear stress theory. The maximum distortion energy theory provides the safest design for ductile materials as it results in the largest allowable stresses before failure compared to the other theories. The document also compares the various theories and discusses when each is best applied depending on the material type and stress conditions.
Response Spectrum Modal Analysis of Buildings using SpreadsheetsIJMER
The document describes how to perform response spectrum modal analysis of buildings using spreadsheets. It discusses the key steps in the analysis procedure according to Indian code IS 1893-2002, including calculating modal mass, modal participation factors, design lateral forces at each floor for each mode, storey shear forces for each mode, and combining results using SRSS and CQC methods. It then presents the development of a spreadsheet tool to automate the analysis process and make it simpler to perform. The spreadsheet allows the user to input parameters like building properties, mode shapes, and performs the calculations to determine design base shear and lateral floor forces according to the specified methods.
every one should inculcate the habit of Cow feeding. the brief description of feeding cows with different pulses to over come problems in life. pl forward this to ur friends and needy.
1. The document describes an idol of Lord Ganesh called Swetarka (Tella Jilledu) Ganapati, made from the roots of a Calotropis plant.
2. Worshipping this idol is said to fulfill desires, remove obstacles, and protect against enemies according to Tantra scriptures.
3. Establishing the idol at home is believed to bring prosperity, wealth, and remove misfortune.
1. Feng shui tips include avoiding flats on stilt floors or with three doors in a line which can cause instability or bad effects, and placing sacred symbols, plants, and technical gadgets in specific areas to attract good fortune.
2. Other tips are removing clutter, lighting incense regularly, hanging a chandelier to enhance family relations, and signing documents during certain moon phases.
3. Maintaining the home by replacing leaky taps and broken items along with using water features can activate energy and improve finances according to feng shui principles.
The document provides 31 tips for saving money, including avoiding impulse purchases, reducing unnecessary expenses, refinancing debts at lower rates, waiting for prices to drop before buying electronics, rewarding yourself for savings by watching your accounts grow, limiting dining out and entertainment spending, creating a monthly savings plan, being patient and not giving up on saving goals. It also recommends saving on household energy and insurance costs, using talents to earn extra income, and reducing spending on drinking, smoking and prepared meals.
Men's health requires maintaining a healthy lifestyle. Eat a balanced diet low in fat and high in nutrients. Exercise regularly by doing activities you enjoy like walking, sports, or strength training. See your doctor for routine checkups and screenings to catch any health issues early.
Loyola Academy, Alwal , Secunderabad-10. B.Sc (chemical Technology). This document provides instructions for an engineering drawing practical exam to be held on October 18th, 2012 for 2 hours. It lists 6 questions to choose 4 from related to constructing geometric shapes like an ellipse, isometric views of solids, bisecting a line and angle, inscribing a circle in a square, constructing a hexagon, and constructing a parabola. Neatness will be considered in scoring.
The document provides 9 engineering graphics questions to choose 5 from. The questions cover topics like constructing an epicycloid, drawing an ellipse with given parameters, determining projections and measurements of lines and shapes, drawing projections of various objects like a pyramid, prism, and cone, developing the surface of a truncated cone, and constructing a vernier scale. The student is asked to answer any 5 questions by drawing the requested projections, shapes, or scales and providing any necessary measurements or calculations. Neatness is also considered in grading the responses.
This document discusses different types of astrological charts used in Vedic astrology. It mentions Moon lagna and Surya lagna charts which are based on calculating the zodiac sign rising at birth based on the Moon and Sun positions respectively. It also refers to the names of houses which likely refers to the twelve astrological houses used to analyze different areas of life in a birth chart.
(1) Students can patent their inventions and earn money if their ideas are commercialized. (2) Understanding IPR helps students respect others' creations and avoid plagiarism. (3) Learning about patents and copyrights can inspire students to be more innovative and help solve problems through new inventions.
Frequently asked questions in INTELLECTUAL PROPERTY RIGHTSSRINIVASULU N V
Intellectual property refers to creations of the mind such as inventions, designs, artistic works, and symbols used in commerce. There are seven main types of intellectual property according to international agreements: patents, industrial designs, trademarks, copyright, geographical indications, integrated circuit layout designs, and undisclosed information/trade secrets. The Designs Act protects new or original designs applied to articles to be manufactured industrially. Registration under the Act confers an initial 10-year copyright on the design. This can be extended for an additional 5 years. Piracy of a registered design for commercial purposes without permission is illegal and can result in fines.
Copy right ppt in intellectual property rightsSRINIVASULU N V
This document provides an overview of intellectual property rights (IPR) in India, including patents, industrial designs, trademarks, copyrights, geographical indications, and related rights. It discusses the types of intellectual property available, how to obtain each type of protection, and some key features and amendments of Indian IPR legislation. The document also outlines the structure of IPR administration and enforcement in India under the Controller General of Patents, Designs and Trade Marks.
novel method of differentiating palm leaf scribers using 2D corelationPaper e...SRINIVASULU N V
National Congress on Communications and Computer Aided Electronic Systems (CCAES 2012)
[1] A novel method is proposed to differentiate between palm leaf scribers using 2D correlation. Palm leaves from two scribers are used as samples.
[2] The method captures depth information from palm leaf images and compares pixel point coordinates of characters written by different scribers in the YZ plane.
[3] 2D correlation values are calculated between test character images and database images of the same character written by different scribers. Higher correlation with one scriber indicates the test character was written by that scriber. The method correctly identified the scriber for over 300 tested characters.
This document summarizes a study that performed PSD (Power Spectral Density) analysis on an automobile dash panel to reduce vibrations. PSD analysis was conducted on a bare dash panel model and a dash panel model with a damping material placed between the panel and a doubler sheet. Modal analysis was performed to obtain mode shapes, which were compared to laser vibrometer test data. PSD vs frequency graphs were plotted and vibration levels were compared between the bare panel and damped panel models. The goal was to identify natural frequencies and reduce noise by using a damping material.
The document presents an analytical method called the dynamic stiffness matrix approach to analyze the torsional vibrations and buckling of thin-walled beams of open section that are resting on an elastic foundation. The method is used to study a thin-walled beam that is clamped at one end and simply supported at the other. Numerical results for the natural frequencies and buckling loads are obtained for different values of warping and elastic foundation parameters.
This document discusses applications of nanotechnology in electronics and mechanical engineering. It outlines several key areas where nanotechnology can have impact, such as semiconductors, passive components, display materials, and packaging/interconnection. For semiconductors, it describes potential applications like doping carbon nanotubes and creating quantum dots. It also discusses using nanoparticles to fabricate nanowire structures for uses like sensors. For packaging, it notes nanotubes and diamond films can improve thermal performance. The document concludes that over the next five years, significant new nanomaterials and processes will address important industry issues, and longer-term nanotechnology will extend or replace technologies to meet customer needs.
This document discusses applications of nanotechnology in electronics and mechanical engineering. It outlines several key areas where nanotechnology can have impact, such as semiconductors, packaging, boards/substrates, and passive components. For semiconductors, nanotechnology allows for doping of nanotubes and creation of quantum dots. It also discusses using nanotubes for quantum computing. For packaging, nanotubes and diamond films can improve thermal conductivity. The document also outlines several developing applications of nanotechnology in nanoelectronics, such as flexible displays, high-density memory chips, smaller transistors, and novel transistors using graphene and nanoparticles.
This document lists 30 provisionally accepted papers for the conference NSRD-2003. The papers cover topics related to rotor dynamics, vibration analysis, fault detection, condition monitoring, and dynamic analysis of rotating machinery and components. The papers are from various organizations in India including research institutions, universities, and industries. Each paper is listed with the title, authors, and organization.
This document outlines the editorial board for the International Journal of Emerging Technology and Advanced Engineering. It lists over 60 members of the advisory and editorial board, including their names, titles, and affiliations. The board members are from a variety of countries and institutions around the world and represent different engineering and technology disciplines.
The document discusses an experimental buckling analysis of thin aluminum cylindrical shells. Three types of cylindrical shell models are considered: a plain shell and shells with longitudinal or circumferential dents. Experiments are conducted to determine the buckling strength of each shell type when compressed axially. Finite element analysis is also performed using ANSYS to calculate the buckling loads, which are then compared to the experimental results. It is found that shells with dents have lower buckling strengths compared to plain shells without dents.
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LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
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significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
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Changes in vegetation cover refer to variations in the distribution, composition, and overall
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Modal and harmonic analysis of tapered composite i
1. Modal And Harmonic Analysis Of Tapered Composite I-
Beam With Big End Fixed
Dr. N.V.Srinivasulu1, Dr.V.Veeranna2, S.Jaikrishna3
1.Associate Professor, Department of Mechanical Engineering, CBIT, Hyderabad-
500075.AP.India. Mail: vaastusrinivas@gmail.com
2. Professor, Department of Technology, Brindavan Institute of Tech and
Science,Kurnool.
3. Sr.Assistant Professor,Deprtment of Mech. Engg., MJCET, Hyderabad.
Abstract
In this paper the tapered thin walled glass epoxy composite I-beam is taken with its big
end fixed and small end is kept free. For harmonic analysis 1.0 N load is applied at free end of
the cantilever beam and. the results obtained are presented in graphical form with displacement
Vs natural frequency and results are presented in graphical form for various cases.
Introduction:
In the present study a thin-walled composite beam with I-section and length L = 8 m is
considered in order to investigate the effects of various parameters namely fibre orientation,
modulus ratio, height-to-thickness ratio and boundary conditions on the natural frequencies and
mode shapes. The geometry of the I-section is shown in Fig. 1.
Fig.1. Thin-walled composite I-beam.
1
2. Modal Analysis
A composite cantilever I-beam is modelled with element shell99 and the material and modal
analysis is carried out by fixing the bigger end and kept smaller end free. The effect of fibre angle
rotation in top and bottom flanges, elastic modulii and height to thickness ratio on natural
frequencies and mode shapes are discussed below.
Effect of fibre angle rotation in top and bottom Flanges
The top and bottom flanges are considered as angle-ply laminates [θ/ -θ], and the web
laminate is assumed to be unidirectional. In this case, the lowest four natural frequencies by the
finite element analysis exactly correspond to the first flexural mode in the x-direction, flexural
mode in the y-direction, second flexural mode in the x-direction, and torsional mode by the
orthotropic closed-form solution, respectively. It is clear that from fig.10.1, the natural
frequencies are increasing with increase in fibre angle rotation. Very small variation in the
natural frequencies for first three modes is observed from 00 and up to fibre angle 450.
10
9 ω1
Natural frequency,Hzs
8 ω2
7 ω3
6
ω4
5
4
3
2
1
0
0 15 30 45 60 75 90
Fiber angle, in degrees
Fig 2. Variation of the non-dimensional natural frequencies of a tapered cantilever
composite beam with big end fixed with respect to fibre angle change in flanges
Mode shapes
The mode shapes corresponding to the first four lowest modes with unidirectional fibre in
web and fibre angle 45° in the top and bottom flanges are illustrated in fig.3.
2
3. (a).Mode 1 (b). Mode 2
(a).Mode 3 (b). Mode 4
Fig.3. Mode shapes of the tapered composite beam with fibre angle 45 0 in top and bottom
flanges
Effect of fibre angle rotation in web
In this case the natural frequencies for first mode are constant for all fibre angles as shown in
fig.4 For second, third and fourth modes frequency is constant from fibre angle 0- 450 and a small
increment in each mode is observed .
Effect of modular ratio
The effects of modulus ratio ( E1 /E2) of composite beams on the natural frequencies and mode
shapes for Tapered Cantilever composite beam is shown below. The stacking sequence of the top
and bottom flanges are [0/90]s, and web is unidirectional. It is observed that the natural
frequencies increase with increasing orthotropy ( E1 /E2).
3
4. 5
4.5
Natural frequency, Hzs
4
3.5
3
ω1
ω2
2.5
ω3
2
ω4
1.5
1
0.5
0
0 15 30 45 60 75 90
Fiber angle, in degrees
Fig.4. Variation of the non-dimensional natural frequencies of a Tapered cantilever composite
beam with big end fixed with respect to fibre angle change in web.
16
ω1
14 ω2
Natural frequency, Hzs
12 ω3
ω4
10
8
6
4
2
0
0 10 20 30 40
Elastic modulus ratio
Fig. 4. Variation of the non-dimensional natural frequencies of a Taper cantilever composite
beam with big end fixed with respect to modulus ratio.
4
5. Harmonic analysis
The harmonic analysis is carried out for a tapered cantilever composite I-beam and load
of 1.0 N is applied at free end. The study is carried out by varying fibre angle rotation in top and
bottom flanges of I- beam and elastic modular ratio and results are obtained and represented in
the graphical form as Frequency Vs. Displacement.
3.00E-04
0
2.50E-04
15
2.00E-04 30
Displacement, in meters
45
1.50E-04
60
1.00E-04 75
90
5.00E-05
0.00E+00
-5.00E-05
-1.00E-04
-1.50E-04
-2.00E-04
0 5 10 15 20 25
Natural frequency, Hzs
Fig5. Frequency vs. Displacement for fibre angle rotation in two flanges
3.00E-04
2.50E-04 0
15
Displacement, in meters
2.00E-04 30
1.50E-04 45
60
1.00E-04 75
5.00E-05 90
0.00E+00
-5.00E-05
-1.00E-04
-1.50E-04
-2.00E-04
0 5 10 15 20 25
Natural frequency,Hzs
Fig.6. Frequency vs. Displacement for fibre angle rotation in web
Effect of fibre angle rotation in top and bottom Flanges
From the fig.5, it is clear that as the frequency increases, the value of the amplitude of
vibration for a cantilever composite beam follows sinusoidal curve, for all fibre angles. For fibre
angle 450, the value of amplitude of vibration is high at frequency of 5 Hz .
5
6. Effect of fibre angle rotation in web
From the fig.10.6, it is seen that as the frequency increases, the value of the amplitude of
vibration for a cantilever composite beam follows sinusoidal curve, for all fibre angles same as
above case.
Effect of modular ratio: From the fig.7, it is evident that there is a small variation in amplitude
of vibration for all modular ratios except for modular ratio of 40. For modular ratio of 40, the
minimum displacement is at frequency of 20 Hz.
4.00E-04
E1/E2=1
3.00E-04 E1/E2=10
E1/E2=20
Displacement, in meters
2.00E-04 E1/E2=30
1.00E-04 E1/E2=40
0.00E+00
-1.00E-04
-2.00E-04
-3.00E-04
-4.00E-04
0 5 10 15 20 25
Natural frequency, Hzs
Fig.7. Frequency vs. Amplitude for various modular ratios.
6
7. Modal and Harmonic Analysis of
Composite I-beam with three circular holes in web
Dr. N.V.Srinivasulu, Associate Professor, Department of Mechanical Engineering, CBIT,
Hyderabad-500075.AP.India.
Mail: vaastusrinivas@gmail.com
Abstract
In this paper, uniform composite thin walled I- beam is considered and three circular
holes are made in the web at 2m apart with holes diameter of 32 mm as shown in fig.1. The beam
is modeled using ANSYS with the same material properties mentioned in the chapter 8. Modal
and harmonic analysis is done for a cantilever boundary condition. Harmonic analysis is carried
out by applying a load of 1.0 N at free end and nodal results at free end are obtained in the form
of amplitude Vs natural frequency graphs for various fibre angle rotations and modular ratios.
The Finite element model of a uniform doubly symmetric composite I-beam with holes in web is
shown in fig.1.
Fig.1. Uniform composite I-beam with circular holes in web
Modal Analysis
The modal analysis is carried out with the top and bottom flanges as angle-ply
laminates [θ/ -θ], and the web laminate is assumed to be unidirectional in I beam. In this
case, the lowest four natural frequencies by the finite element analysis exactly correspond to
the first flexural mode in the x-direction, and flexural mode in the y-direction, second
flexural mode in the x-direction, torsional mode by the orthotropic closed-form solution,
respectively.
7
8. Effect of fibre angle rotation in top and bottom Flanges
14
12
ω
Natural frequency,Hzs
10
1
8 ω
2
6
4
2
0
0 15 30 45 60 75 90
fiber angle, in degrees
Fig.2. Variation of the non-dimensional natural frequencies of a cantilever Composite beam with
circular holes in web with fibre angle change in flanges
From fig.2, it is clear that natural frequencies for fourth mode increases with increasing
fibre angle from 0 to 450 , maximum at 450 and then decreases afterwards. In second mode, the
natural frequency at 450 fibre angle found to be minimum.
Mode shapes
The mode shapes corresponding to the first four lowest modes with unidirectional fibre
in web and fibre angle 45° is taken in the top and bottom flanges are illustrated in Fig.3.
(a).Mode 1 (b) Mode 2
8
9. (c) Mode 3 (d) Mode 4
Fig. 3. Mode shapes of the Cantilever composite beam with circular holes in web with fibre
angle 45 0 in top and bottom flanges
Effect of fibre angle rotation in web
12
10
Natural frequency, Hzs
8
6
4 ω
1
2
0
0 15 30 fiber angle, in60
45 degrees75 90
Fig4. Variation of the non-dimensional natural frequencies of a Cantilever composite
beam with circular holes in web with to fibre angle change in flanges
From fig.4, it is observed that natural frequencies of third mode increases with increasing
fibre angle from 0 to 450 reaches maximum at 450 and then decreases afterwards. For all other
modes, there is no variation in natural frequencies by changing the fibre angle in web.
Effect of Elastic modular ratio:
In this, it shows the effects of modulus ratio ( E1 /E2) of composite beams on the natural
frequencies and mode shapes for uniform Cantilever composite beam with circular holes in
web (Fig.5). The stacking sequence of the top and bottom flanges are [0/90]s, and web is
unidirectional. It is observed that the natural frequencies increase with increasing
orthotropy ( E1 /E2).
9
10. 8
7
6
Natural frequency, Hzs
5
4
ω
3 1
ω
2 2
1
0
0 10 20 30 40
Elastic modular ratio
Fig. 5. Variation of the non-dimensional natural frequencies of a Cantilever
composite beam with circular holes in web with elastic modular ratio
Harmonic Analysis
The harmonic analysis is carried out for a cantilever composite uniform doubly
symmetric I-beam and load of 1 Newton is applied at free end. The study is carried out by
varying fibre angle rotation in top and bottom flanges of I- beam and elastic modular ratio and
results are obtained and represented in the graphical form as Frequency vs. Displacement.
Effect of fibre angle rotation in top and bottom Flanges
From fig.6, the maximum displacement is observed at natural frequency of 20 Hz. for fibre
angle 450 and displacement is maximum for fibre angle600 at frequency 5Hz.
3.00E-04
2.50E-04 0
1
2.00E-04
Displacement, in meters
5
3
1.50E-04
0
4
1.00E-04
5
5.00E-05
0.00E+00
-5.00E-05
-1.00E-04
0 5 10 15 20 25
Natural frequency, Hzs
Fig.6. Frequency vs. Displacement for fibre angle rotation in two flanges
10
11. Effect of fibre angle rotation in web
4.00E-05
2.00E-05
0.00E+00
Displacement, in meters -2.00E-05 0
15
-4.00E-05 30
-6.00E-05 45
60
-8.00E-05 75
-1.00E-04
-1.20E-04
0 5 10 15 20 25
natural frequency, Hzs
Fig.7. Frequency vs. Displacement for fibre angle rotation in web.
From fig.7, it is observed that, for fibre angle 450, the maximum displacement is at natural
frequency of 10 Hz.
Effect of modular ratio:
From fig.8, it is observed that, for modulus ratio of 30, the maximum displacement is at
natural frequency of 5 Hz.
2.00E-04
1.00E-04
Displacement, in
0.00E+00
-1.00E-04
meters
E1/E2=1
-2.00E-04 E1/E2=10
E1/E2=20
-3.00E-04
-4.00E-04
0 5 10 15 20 25
Natural frequency, Hzs
Fig.8. Frequency vs. Displacement for various modular ratios.
Conclusions:
11