scholarly journals A Coupling Vibration Test Bench and the Simulation Research of a Maglev Vehicle

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Weihua Ma ◽  
Rongrong Song ◽  
Junqi Xu ◽  
Yu Zang ◽  
Shihui Luo
Keyword(s):  
Test Bench ◽  
Dynamics Simulation ◽  
Dynamics Model ◽  
Simulation Research ◽  
Coupling Vibration ◽  
Maglev Vehicle ◽  
Levitation System ◽  
Track Irregularity ◽  
Simulation Results ◽  
Track Beam

To study the characteristics of the coupling vibration between a maglev vehicle and its track beam system and to improve the performance of the levitation system, a new type of vibration test bench was developed. Take a single maglev frame as the study object; simulation of the coupling vibration of the maglev vehicle, levitation system, and track beam were achieved. In addition, all types of real track irregularity excitations can be simulated using hydraulic actuators of the test bench. To expand the research scope, a simulation model was developed that can conduct the simulation research synergistically with the test bench. Based on a dynamics model of the test bench, the dynamics simulation method determined the influence on the levitation control performance of three factors: the track beam support stiffness, the track beam mass, and the track irregularity. The vibration resonance phenomenon of the vehicle/track system was reproduced by the dynamics simulation, and a portion of the simulation results were validated by the test results. By combining the test bench and the dynamics model, experiments can be guided by the simulation results, and the experimental results can validate the dynamics simulation results.

Construction of a Rational Tire Model for High Fidelity Vehicle Dynamics Simulation Under Extreme Driving and Environmental Conditions

2010 ◽  
Author(s):  
S. C¸ag˘lar Bas¸lamıs¸lı ◽  
Selim Solmaz
Keyword(s):  
Vehicle Dynamics ◽  
Dynamics Simulation ◽  
High Fidelity ◽  
Tire Model ◽  
Dynamics Model ◽  
Vehicle Model ◽  
Prospective Design ◽  
Magic Formula ◽  
Rational Models ◽  
Simulation Results

In this paper, a control oriented rational tire model is developed and incorporated in a two-track vehicle dynamics model for the prospective design of vehicle dynamics controllers. The tire model proposed in this paper is an enhancement over previous rational models which have taken into account only the peaking and saturation behavior disregarding all other force generation characteristics. Simulation results have been conducted to compare the dynamics of a vehicle model equipped with a Magic Formula tire model, a rational tire model available in the literature and the present rational tire model. It has been observed that the proposed tire model results in vehicle responses that closely follow those obtained with the Magic Formula even for extreme driving scenarios conducted on roads with low adhesion coefficient.

The Simulation Research of Nano-Indentation Based on the Molecular Dynamics

2012 ◽  
Vol 500 ◽  
pp. 702-706
Author(s):  
Ying Zhu ◽  
Ling Ling Xie ◽  
Sen Song ◽  
Shun Hen Qi ◽  
Qian Qian Liu
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Large Scale ◽  
Optimization Method ◽  
Dynamics Simulation ◽  
Simulation Research ◽  
Nano Indentation ◽  
Simulation Calculation ◽  
Simulation Results ◽  
The Difference

The work in the optimization of the simulation of nanoindentation based on the molecular dynamics was mainly introduced in this paper. One optimization method, freeze atoms method was proposed according to the characteristics of nanoindentation process itself, then did the simulation calculation through the use of freeze atoms method and the traditional calculation method, It was found that the difference between simulation results and experimental results of hardness decreased gradually with enlarge the scale of molecular dynamics simulation (with increase of the indentation depth), from 32.39% of 5nm decreased to 14.6% of 25nm. By comparison, it was found that the optimized algorithm could improve the efficiency of simulation in large-scale molecular dynamics simulation., confirmed the correctness and effectiveness of freeze atoms method.

Optimization Design and Simulation Research of Hydraulic Test Bench

2013 ◽  
Vol 744 ◽  
pp. 23-26
Author(s):  
Fan He Meng ◽  
Jun Hua Zhang
Keyword(s):  
Experimental Data ◽  
Simulation Modeling ◽  
Optimization Design ◽  
Test Bench ◽  
Simulation Models ◽  
Hydraulic Test ◽  
Simulation Research ◽  
Simulation Results ◽  
Amesim Simulation ◽  
Hydraulic Circuits

For the limitations of the existing hydraulic test bench for experimenting with multi-species of hydraulic components, the additional cartridge valve circuit and multi-way directional valve circuit were designed. The AMESim simulation models of the hydraulic test benchs basic hydraulic circuits were established and simulated. Then the simulation results were compared with the experimental data to get some principles of simulation modeling and optimize the models. These principles were used to simulate the additional hydraulic circuits. Through analysis of the simulation results, theory supports were provided to the optimal design of hydraulic test bench. In this way, the existing hydraulic test bench can be fully used and the suitable components were selected, reducing the waste of resources. Besides, the simulation models can be used as part of the virtual hydraulic teaching.

scholarly journals Structural Design and Dynamics Simulation Analysis of A Certain Type of Co-frame Launcher

2021 ◽  
Vol 2125 (1) ◽  
pp. 012037
Author(s):  
Hanchao Liu ◽  
Anxin Guo ◽  
Xuezhi Wang
Keyword(s):  
Dynamic Response ◽  
3D Modeling ◽  
Structural Design ◽  
Simulation Analysis ◽  
Dynamics Simulation ◽  
Dynamic Parameters ◽  
Dynamics Model ◽  
Modeling Software ◽  
Design Requirements ◽  
Simulation Results

Abstract To study the dynamic response of a certain type of co-frame launcher during launch, this article uses the 3D modeling software Pro/E to import the model into Adams from the perspective of launch dynamics. the launch dynamics model of the shared-frame launcher is established. We apply the ejection thrust of the two types of missiles to the corresponding ejection devices and measure and collect the dynamic parameters of the cartridge system. The simulation results show that the dynamic parameters of the A and B missiles are in line with the available overload design requirements. The B-type missiles are superior to the A-type missiles in terms of ballistic orbit contact force and ejection attitude.

Design of the Assistive Leg and the Simulation Research

2013 ◽  
Vol 339 ◽  
pp. 147-152
Author(s):  
Zhen Ze Liu ◽  
Lei Zhang ◽  
Yan Tao Tian
Keyword(s):  
Lower Extremity ◽  
The Body ◽  
Dynamics Simulation ◽  
Human Body Model ◽  
Compact Structure ◽  
Simulation Research ◽  
Existing Problems ◽  
Body Model ◽  
Simulation Results ◽  
Exoskeleton Device

The wearable assistive leg is a kind of traditional exoskeleton device, which not only can help healthy people with walking, but also can assist those who have walking troubles to rehabilitate. Based on the bionics principle and the research on the body mechanism, a wearable assistive leg for rehabilitation training and power augmentation is designed. This device satisfies the requirement of the compact structure, portability and safety. Then the dynamic model of the assistive leg is constructed based on the Lagrange theory. The mechanical structure is devised by Solidworks2011 software in which a standard human body model and this assistive leg are assembled. Thus the assembly is introduced into Adams2007 R3. The dynamics simulation is carried in this software. The results and the existing problems are analyzed. The simulation results show that this kind of assistive leg can provide helping force for human lower extremity movements.

Dynamics Simulation Research of Planar Four-Bar Mechanism with Multi-Joint Clearance

2013 ◽  
Vol 860-863 ◽  
pp. 2650-2653 ◽  
Author(s):  
Shao Jun Bo ◽  
Xiao Wang
Keyword(s):  
Mechanical System ◽  
Mechanical Design ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Joint Clearance ◽  
Kinematic Pair ◽  
Simulation Research ◽  
Preliminary Study ◽  
Simulation Results ◽  
Dynamics Models

On the basis of dynamics simulation software ADAMS, we built dynamics models of planar four-bar mechanism, it built the model of contact force and friction to analysis the dynamics simulation of mechanism. we made a preliminary study on the effect on the flexible components and the backlash of the kinematic pair on mechanical system dynamics characteristics. The result showed that mechanism with single joint clearance had little influence on the mechanism speed and had some impact on mechanism acceleration. Mechanism with multi-joint clearance had bigger effect on the mechanism and acceleration appeared noticeable fluctuation, this model was closer to the phenomenon of objects movements in reality. The simulation results provided reliable reference of mechanical design.

Study on the Influence of Government Incentive Measures on Product Recovery Based on System Dynamics Simulation

2013 ◽  
Vol 711 ◽  
pp. 701-706
Author(s):  
Xian Liang Zong
Keyword(s):  
System Dynamics ◽  
Evolutionary Game ◽  
Stable State ◽  
Product Recovery ◽  
Dynamics Simulation ◽  
Recovery Ratio ◽  
System Dynamics Model ◽  
Dynamics Model ◽  
Reasonable Range ◽  
Simulation Results

An evolutionary game model between manufacturers is established to study the influence of government incentive measures for the EOL product recovery based on the assumption that all manufacturers have bounded rationality. Analysis on stable state shows that the evolutionary stable state does not always exist in the model. On the basis of this analysis, a system dynamics model is established to analyze the influence of the lowest recovery ratio and the fixed reward on the recovery behaviors of manufacturers by simulation. Simulation results illustrate that there exists a reasonable range of the lowest recovery ratio within which government incentive measures work well and the fixed reward can expand the width of the reasonable range. Any above or below the reasonable range of the lowest recovery ratio will invalidate government incentive measures. Government should enhance the degree of the lowest recovery ratio in the below situation, and provide manufacturers with greater amounts of reward for their product recovery actions in the above situation.

scholarly journals A modular framework to generate robust biped locomotion: from planning to control

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Mohammadreza Kasaei ◽  
Ali Ahmadi ◽  
Nuno Lau ◽  
Artur Pereira
Keyword(s):  
Numerical Simulations ◽  
Predictive Control ◽  
Biped Locomotion ◽  
Input Output ◽  
Dynamics Model ◽  
Biped Robots ◽  
The Core ◽  
Simulation Results ◽  
Reference Trajectories ◽  
Modular Framework

AbstractBiped robots are inherently unstable because of their complex kinematics as well as dynamics. Despite many research efforts in developing biped locomotion, the performance of biped locomotion is still far from the expectations. This paper proposes a model-based framework to generate stable biped locomotion. The core of this framework is an abstract dynamics model which is composed of three masses to consider the dynamics of stance leg, torso, and swing leg for minimizing the tracking problems. According to this dynamics model, we propose a modular walking reference trajectories planner which takes into account obstacles to plan all the references. Moreover, this dynamics model is used to formulate the controller as a Model Predictive Control (MPC) scheme which can consider some constraints in the states of the system, inputs, outputs, and also mixed input-output. The performance and the robustness of the proposed framework are validated by performing several numerical simulations using MATLAB. Moreover, the framework is deployed on a simulated torque-controlled humanoid to verify its performance and robustness. The simulation results show that the proposed framework is capable of generating biped locomotion robustly.

Kinematics and Dynamics Simulation Research for Roller Coaster Multi-Body System

2011 ◽  
Vol 421 ◽  
pp. 276-280 ◽  
Author(s):  
Ge Ning Xu ◽  
Hu Jun Xin ◽  
Feng Yi Lu ◽  
Ming Liang Yang
Keyword(s):  
Structural Design ◽  
3D Model ◽  
Structure Design ◽  
Dynamics Simulation ◽  
Body System ◽  
Load Spectrum ◽  
Roller Coaster ◽  
Simulation Research ◽  
Calculation Results ◽  
Multi Body

To assess the roller coaster multi-body system security, it is need to extract the running process of kinematics, dynamics, load spectrum and other features, as basis dates of the roller coaster structural design. Based on Solidworks/motion software and in the 3D model, the calculation formula of the carrying car velocity and acceleration is derived, and the five risk points of the roller coaster track section are found by simulation in the running, and the simulation results of roller coaster axle mass center velocity are compared with theoretical calculation results, which error is less than 4.1%, indicating that the calculation and simulation have a good fit and providing the evidence for the roller coaster structure design analysis.

Study on Engine Kinematics and Dynamics Simulation Based on COSMOSMotion

2012 ◽  
Vol 503-504 ◽  
pp. 731-734
Author(s):  
Xiao Xu Liu ◽  
Min Chen ◽  
Ai Hua Tang
Keyword(s):  
Virtual Prototype ◽  
Dynamics Simulation ◽  
Kinematics And Dynamics ◽  
Engine Model ◽  
Kinematics Simulation ◽  
Simulation Based ◽  
Calculation Results ◽  
Simulation Results ◽  
Dynamics Simulations

The engine model with 4 cylinders is built by SolidWorks, the kinematics and dynamics simulations of the engine virtual prototype are done by COSMOSMotion, the results of kinematics simulation are checked, there are very small errors between the simulation results and the calculation results according to formulas. The mainly results of dynamics simulation are given. The simulation result consists with the parameters of the engine.

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