Stable platform inertial guidance
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This document analyzes the mechanical stiffness of a beryllium cube design for an inertial navigation platform using finite element analysis. A 14-inch beryllium cube weighing 70 lbs is modeled with a 10-node tetrahedral mesh. The analysis shows acceleration-induced deflections of 0.0000008009 inches on the X axis, 0.0000039840 inches on the Y axis (direction of applied 20G load), and 0.0000003582 inches on the Z axis, confirming the beryllium cube's suitability as a stable platform for inertial navigation and guidance systems. Automated finite element analysis allows such calculations to be performed in just 20 seconds compared to 4 months for manual meshing in 1974
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1) The document investigates the step response of a 2 DOF quarter-car model with passive suspension using MATLAB.
2) It derives the mathematical models for the sprung-mass displacement and acceleration in response to a 100mm step road disturbance.
3) The simulations show that increasing the suspension damping coefficient decreases the overshoot and settling time of the sprung-mass displacement response, but increases the maximum acceleration. Suspension stiffness has little effect on the maximum acceleration.
Thesis_PPT
This document describes the design and validation of a slip-based traction control system using co-simulation between ADAMS and MATLAB/SIMULINK. The objectives are to develop a traction control scheme to enhance vehicle stability under changing road conditions. A sliding mode controller is designed in SIMULINK and a vehicle model is created in ADAMS. Co-simulation is performed to validate that the controller can robustly control wheel slip as road parameters and vehicle mass vary. Simulation results demonstrate the controller tracks the desired slip ratios under different road surfaces and mass values, improving vehicle stability compared to open-loop control.
Thermostamping simulation for woven thermoplastic composites (PA) with HyperForm
The thermostamping process of thermoplastic composites can be analyzed with simulation software. In addition to the optimization that can be brought to process (defects, raw material quantity …), the main interest is to integrate results from process into the performance simulation. This article presents an approach to simulate thermostamping of thermoplastic composites (PA) with HyperForm.
The material law is identified from Bias test trials, then, the simulation is performed by HyperForm with the solver Radioss or Ls-Dyna. Fiber orientations (for non-linear anisotropic behavior) and defects (global wrinkles, and wrinkles in the thickness, area with failure risk, thickness variation…) are identified and mapped on structural mesh for mechanical simulation.
Based on this approach, several test/simulation comparisons were performed on both static and dynamic. They demonstrate the necessity of considering the process phase, especially for complex geometries.
Regarding advanced application for such simulation tool: Faurecia Automotive Exterior is developing technologies to produce one-shot visible parts (CFRT thermostamping + overmolding injection in one step). This case study is the most challenging application we are working on. Combining thermostamping simulation and one-shot process brings benefits to both sides thanks to cross results on complex application.
Globaly, to improve the prediction of this simulation tool, next steps are the computation of local density; the consideration of thermal exchanges with the mold during the production process; the modelization improvement of boundary conditions during process (woven holding …, frames…).
Speakers
Guillaume CHAMBON, Product Research & Advanced Simulation Manager, FAURECIA Automotive Exterior
IRJET- Static & Dynamic Analysis on Automated Car Parking Towers & Study Beha...
This document presents a study on the static and dynamic analysis of automated car parking towers to evaluate their behavior under different loads. The study uses STAAD.Pro software to analyze a sample parking tower subjected to dead loads, live loads, wind loads for various zones in India, and seismic loads for different seismic zones. The analysis determines forces, moments, deflections, and steel quantities to compare the tower's performance under different load combinations and conditions. Key objectives are to understand factors affecting tower behavior and provide a parametric study to optimize the design.
Portfolio
This document provides a summary of an engineering portfolio belonging to Pramod Ravichandran, a mechanical engineer. It includes samples of 3D modeling and analysis projects completed using software like SolidWorks, CATIA V5, and ANSYS. Specific projects summarized include designing a kinetic sculpture called Strandbeest using a rack and pinion mechanism, modeling of vehicles like fighter jets and high-end sports cars, external flow analysis of compressible turbulent aerodynamic applications, and failure testing of concrete beams strengthened with carbon fiber reinforced polymer. The document also shows progression in the engineer's car design skills over time.
Present car racing_setup
This document summarizes research using evolutionary algorithms to optimize car setup parameters in a racing simulator called TORCS. The researchers tested both steady-state and multi-objective evolutionary approaches. In a competition involving three tracks, the multi-objective approach using SPEA2 performed best, ranking first in total distance covered across all tracks compared to other participants. Future work could involve meta-optimization of the fitness function and improvement of evolutionary algorithm parameters.
Modeling of Flexible and Rigid Pavements under Aircraft Loading
Masters thesis defense presentation by Elise Mansour, a graduate student, in the Pavement Engineering and Science program at University of Nevada, Reno (UNR).
- Project funded by the Federal Aviation Administration (FAA).
- Work Credit: Dr. Peter E. Sebaaly, Dr. Elie Y. Hajj, Dr. Gabriel M. Bazi and Elise Mansour.
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Simulation of the Surface Hardening of a Forged Crankshaft
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Thermostamping simulation for woven thermoplastic composites (PA) with HyperForm
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a lot of bolts were received with an incorrect certificate of compliance , field failures were numerous
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This document is a damage stress analysis report for a bow thruster assembly that was involved in an underwater collision. It summarizes the solidworks model of the assembly, details an FEA mesh and collision simulation with a rocky bottom, and analyzes the maximum stresses on the struts. Resonant frequency analyses were also conducted, identifying three vibration modes that could lead to propeller blade flutter or collisions with the cowling. The conclusions recommend strengthening the support struts and performing qualification testing over the full speed range.
Cross axis vibration
This document discusses vibration testing of equipment and whether cross-axis motion during testing is significant. It notes that vibration tests are usually done in three perpendicular axes but that overturning moments can cause responses in axes perpendicular to the one being excited. Modal analysis and vibration testing of a laser electronics assembly showed that cross-axis responses could be a significant fraction of the in-line responses, with quality factors ranging from 4 to 58. The conclusions are that orthogonal vibration testing does not guarantee orthogonal peak responses and that fatigue calculations should include all axial responses.
Ceramic cavity resonator
This document summarizes the assembly process for a ceramic microwave resonator cavity using a shrink fit technique. Key steps include heating the aluminum housing to expand it, inserting the ceramic puck using an alignment fixture, and allowing the assembly to cool which causes the housing to contract around the puck, holding it firmly in place through compression. Finite element analysis confirms the ceramic is held safely in compression while the housing experiences some permanent plastic deformation within its yield strength to form an interference fit.
Shock sensitive components mythology
This document discusses myths and best practices for packaging shock sensitive electronic components. It notes that shock levels measured in G units for components do not necessarily translate to the same exposure levels for those components when mounted in a system. The document recommends establishing system-level shock requirements, obtaining component shock specifications, designing mounts, and using modeling to calculate dynamic response of components in a system. It provides an example where modeling showed a crystal oscillator experienced 70Gs of shock in a system designed for a 50G specification, due to mounting factors. It concludes systems have many dynamic factors that influence component-level responses to shock.
TQFP HALT testing stress analysis
The document analyzes the potential for lead cracking in a TQFP32 package under vibration testing. A Solidworks simulation modeled the package and circuit board to determine major resonances and peak lead stresses. The simulation found a package resonance at 50kHz from lead frame and package bending. HALT testing was predicted to induce a peak lead stress of 65,000 psi, above the copper alloy's endurance limit of 20,000 psi, indicating a potential for fatigue cracking in the leads from the hammer blows.
Flex coupling stress analysis
A flexible coupling for torque transmission between misaligned shafts is proposed. Finite element stress analysis was used to estimate the life of a 0.2-0.3 inch coupling made of mild alloy steel with a 0.01 inch helical cut to manage shaft misalignment. The analysis applied torque loading and misalignment conditions to determine the stress loading and distortion over the expected range of service life.
Graphics card resonances
This document discusses how to increase the natural frequency of a graphics card assembly to reduce vibration. It shows that doubling the weight by adding a stiff heatsink that also provides cooling doubled the natural frequency. The goals are to increase stiffness and decrease mass to raise the ratio of stiffness to mass. A base graphics card had a frequency of 16hz, adding a retention bracket raised it to 18hz, and incorporating an aluminum heatsink and fans increased the frequency to 32hz while doubling the weight.
Stiffening of a shock lab test chassis
A document summarizes the testing of a lightweight chassis to reduce shock pulse deflection. The baseline perforated steel design resulted in a deflection of 9.46E-04 inches. Modifying the critical instrument mounting plate to be non-perforated reduced the deflection to 9.57E-05 inches, a 10 times reduction. Stress on the modified design was well below the yield point, indicating no damage is expected.
Cordwood electronic packaging
This document discusses cordwood discrete component electronic packaging used in the 1950s-1960s. Cordwood modules involved stacking electronic components vertically in a cylindrical housing using insulating standoffs, allowing for high packaging density. Early implementations like guidance electronics in missiles had very short service lives due to high vibration levels from tactical use. Modifications like adding mounting feet and spacers could significantly increase the first modal frequency and reduce stresses, resulting in an estimated service life of over 175 hours for applications like tactical jet fighters.
Drill bit life calculation
slightly damaged 3/8 drill bit wobbles about .003 inches
what is the estimated life before fracture?
Barrel stress in a 12lb Napoleonic cannon
FEA used to calculate stress and deflection in a field artillery piece used by Napoleon and in the US civil war
Highway wind damage
A finite element analysis was conducted to simulate the effects of Category 5 hurricane winds on a highway sign. The 3D solidworks model represented the steel construction and bolted connections to concrete supports. The FEA mesh and 200 mph steady wind loading predicted over 2 inches of permanent deformation and stress exceeding the steel yield point near the base of vertical supports, indicating failure. More advanced dynamic analysis was recommended to predict vibration from wind turbulence.
Fan blade resonances
This document summarizes a finite element analysis of a 10-blade plastic fan design for JK Locowitz Aero Ltd. The analysis found the first resonance mode of the fan blades at 672.99 Hz, corresponding to a fan speed of around 42,000 RPM, well above the target design speed of 7,000 RPM. While there is a very low risk of resonance at the target speed, the document recommends initial prototypes be tested up to 10,000 RPM to establish a safety margin.
Lap shear bolted plates
This document summarizes a study on bolt failures in a heavy steel lap shear joint. The goals were to evaluate grade 5 bolts currently in use, demonstrate sequential bolt failure, determine maximum load capacity, and calculate a safety factor for a heavy lift rigging fixture. Testing of an assembly with 8 bolts found failures at 2 bolts and 6000 lbs of load. Testing of an assembly with 6 bolts found failures at 4 bolts and 6000 lbs of load, indicating complete failure would occur at 3 tons of load. The document recommends stamping the plates with a maximum 1.5 ton load and changing to higher strength Grade 8 bolts to increase the bolt safety factor of 1.2 to an acceptable 1.5.
Santa maria revisited with fea
The document discusses using finite element simulation to model the structural design of the Santa Maria's wooden hull and frames. It details creating a CAD model from historical plans, meshing frame section #25, and running simulations applying 2 tons of lateral loading. The simulation found the oak frame experienced maximum stress of 7100 psi and deformation of 0.040 inches, while aluminum and steel alternatives had higher strengths but also higher weights. The conclusion is that modern metals provide significant design strength margins but at a large penalty in increased weight for this hull component.
Dual level vibe isolation
The document describes a dual-level vibration isolation system designed to increase noise isolation for an RF electronics assembly. It aims to provide a low-cost solution that can be introduced into forward production to enhance electrical performance. Simulation results show the system uses a 2 degrees of freedom design with two levels of isolation via rubber chassis isolators and rubber grommet isolators. Frequency response plots indicate peak isolations of 135 Hz and 65 Hz across three input axes.
Automotive CV joint rubber boot stress analysis
The document describes a nonlinear finite element analysis of an automotive CV joint rubber boot. The analysis used Solidworks Simulation 2017 to model the rubber material's incompressible behavior and applied torsion and tension loads. The 150,000 degree of freedom mesh predicted a maximum stress of 5,500 psi and deformation of 0.095 inch, exceeding the material's 3,000 psi tensile strength and indicating local tearing failure.
Engine compression ratio study
The document analyzes the stress on piston and connecting rod components from increasing the compression ratio on a small block V8 engine from 9:1 to 11:1. Finite element analysis showed that at a 9:1 ratio the maximum stress was 45,810 psi, while an 11:1 ratio would cause maximum stress of 105,400 psi, below the alloy steel safety factor of 90,000 psi. The conclusion is that increasing the ratio to 11:1 would likely cause cracking and failure of the connecting rod.
Nonlinear FEA analysis Rubber gasket
This document summarizes the nonlinear finite element analysis of a silicone rubber gasket conducted using Solidworks Simulation 2015. The analysis used nonlinear material properties and geometric nonlinearity to model the incompressible and bulging behavior of rubber under compression. The model was meshed and subjected to a 0.035 inch displacement in the -Z direction. The results showed a maximum displacement including sliding and buckling, and a maximum stress of 234 psi, which is below the material strength of 700-800 psi. Revision A changed the material to a 70 durometer silicone rubber.
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原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
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6:个人职称评审加20分
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原版一模一样【微信：741003700 】【美国波士顿大学毕业证学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
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留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
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Stable platform inertial guidance
- 1. BERYLLIUM STABLE PLATFORM for INERTIAL NAVIGATION AND GUIDANCE SYSTEMS 3/27/2015 Don Blanchet 3B Associates 339-234-3544 For Reference only
- 2. GOAL Compute the mechanical stiffness of a candidate inertial platform design using finite element analysis Loading is 20G steady state Triad compensation can be estimated
- 3. Design – 14 inch Beryllium cube Weight 70 lbs
- 5. FEA mesh – 10 node tetras
- 6. FEA mesh – 10 node tetras
- 11. Results summary Platform axis Acceleration deflection, inches X .0000008009 Y .0000039840 Z .0000003582
- 12. Footnote Automatic meshing compute time approximately 20 Seconds 1974 manual meshing time 4 months
- 13. 1974 Mainframe