Numerical Analysis of the Dynamic Interaction Between Pantograph and Overhead Contact Line Using FEM

2011 ◽  
Author(s):  
Sung Pil Jung ◽  
Tae Won Park ◽  
Jin Hee Lee
Keyword(s):  
Numerical Analysis ◽  
Contact Line ◽  
Dynamic Interaction ◽  
Fe Analysis ◽  
Contact Forces ◽  
Analysis Program ◽  
Analysis Model ◽  
Element Analysis ◽  
Simulation Results ◽  
Analysis Models

This study aims to create a numerical analysis model which can investigate the interaction between pantograph and overhead contact line used for railway vehicles, and validate the simulation results according to EN 50318 standards. Finite element analysis models of pantograph and overhead contact line are created using SAMCEF, a commercial FE analysis program, and mean, standard deviation, maximum and minimum values of contact forces are obtained. The simulation results are validated according to EN 50318, and the reliability of SAMCEF as an analysis solver of railway vehicle’s catenary system is discussed.

Corn-Seed Modeling and Simulation Analysis Based on Shape Features

2014 ◽  
Vol 602-605 ◽  
pp. 779-782 ◽  
Author(s):  
Hui Yan ◽  
Duo Long
Keyword(s):  
Modeling And Simulation ◽  
Simulation Analysis ◽  
Modeling Method ◽  
Combination Method ◽  
Shape Features ◽  
Analysis Model ◽  
Corn Seed ◽  
Simulation Results ◽  
Analysis Models

Based on the shape features of corn seed, this paper proposes the modeling method of manual combination of eight spheres, which constructs the analysis models for corn seed Ji Feng 218 and Chang Dan 228 with the purpose of better simulation of corn seeds. Furthermore, another analysis model for Chang Dan 228 is also built with reference to the four-sphere combination method. The comparison between the simulation results from these two models demonstrates the feasibility and superiority of the model of combination of eight spheres.

Finite Element Analysis of the Mechanical Structure in Portable Exoskeleton Based on DOF Coupling

2013 ◽  
Vol 706-708 ◽  
pp. 1140-1145
Author(s):  
Fang Liu ◽  
Wen Ming Cheng ◽  
Yi Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Human Motion ◽  
Analysis Model ◽  
Human Body Model ◽  
Element Analysis ◽  
Standard Format ◽  
Mechanical Structure ◽  
The Finite Element Analysis ◽  
Simulation Results

Since the posture of portable exoskeleton is consistent with human motion and each joint degree of freedom is same, on the basis of DOF coupling in portable exoskeleton, the finite element analysis of the mechanical structure in portable exoskeleton has been calculated. According to the anthropomorphic mechanism design method, the universal joint structure has been used to meet the requirements of degrees of freedom in the mechanical structure of the exoskeleton; using the Hydraulic cylinder to simulate the contraction or stretch of human muscle, and the three-dimensional model of the exoskeleton mechanical systems has been created with the Solidworks software; selecting Human CAD software and setting the parameters of the movement of the human body model, the variations of the various joints can be obtained; using the Parasolid as the standard format for data transfer between the two software Solidworks and ANSYS, the finite element analysis model was established, and according to the principle of coupling, the three translational DOF and two rotating DOF was coupled, besides through both legs vertical standing, one knee kneeling, and one leg vertical standing three conditions, the exoskeleton strength was analyzed. The simulation results show that under the three conditions, a concentrated stress all has been found in the exoskeleton structure, besides the concentrated stresses all have been obtained in the cross-section changing site or the junction of the two components, which stress values exceeded the allowable stress values of the aluminum alloy material, so the suggestions for improvement of the structure are put forward in the article; at the same time, the simulation results provide a numerical basis for the optimization of the portable exoskeleton structure.

Soil-High-Rise Building Group Dynamic Interaction Considering Site Effect

2013 ◽  
Vol 683 ◽  
pp. 903-908
Author(s):  
Qi Ge ◽  
Feng Xiong ◽  
Qun Yi Huang
Keyword(s):  
Finite Element ◽  
Free Field ◽  
Dynamic Interaction ◽  
Second Step ◽  
Analysis Model ◽  
Element Analysis ◽  
High Rise ◽  
High Rise Building ◽  
External Domain ◽  
Internal Domain

This article reports a sub-domain method to analyze the dynamic interaction of soil-high-rise building group considering sit effect, which is the extension of the domain reduction method proposed by Bielak and his coworkers in the framework of the finite-element method, originally for building–soil–foundation interaction problems. The whole domain with high-rise building group is divided into two interrelated sub-domains, the external domain and the internal one. And the method contains two steps. In addition, the effect of the external domain to the internal domain is expressed by the equivalent forces which are put on the nodes of the interface between the two sub-domains in the second step. The formation of the equivalent force is attained according to the equation of motion. In the first step the free-field ground motion is calculated under the bedrock wave excitation, and all the nodal displacements are stored. Then the equivalent forces are calculated according the data in the first step, using the formulation of the equivalent force. In the second step a finite element analysis model of the sub-domain containing the internal domain and the high-rise building group is established, and the equivalent forces are put on the nodes of the interface. Later the seismic response of soil-high-rise building group can be calculated.

Study on the Analysis Model of the Self-Centering Wall

2013 ◽  
Vol 353-356 ◽  
pp. 1850-1857 ◽  
Author(s):  
Xiao Bin Hu ◽  
Wen Xia Li ◽  
Hao Xiang ◽  
Hui Gao He
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Theoretical Analysis ◽  
Mechanical Behavior ◽  
Numerical Simulations ◽  
The Self ◽  
Hysteresis Curve ◽  
Analysis Model ◽  
Horizontal Connection ◽  
Analysis Models

The self-centering wall including both prestressed tendons and dampers is proposed in this paper, and the corresponding general finite element numerical analysis model, simplified numerical analysis model and theoretical analysis model were established respectively, focusing on how to simulate the prestressed tendons, dampers and the horizontal connection between the wall and the foundation. The numerical simulations of the self-centering wall subjected to reversal loading were performed using the above two numerical analysis models, and the results were compared to those obtained from theoretical analysis. It is indicated that the hysteresis curve of the self-centering wall under reversal loading exhibits flag shape and no residual displacement exists after the wall is unloaded completely. The numerical analysis results match well with those from theoretical analysis, which shows the two numerical analysis models proposed in this paper can be well used to capture the mechanical behavior of the self-centering wall.

The Finite Element Analysis of Pile-Raft Foundation after Optimization of the Raft Thickness

2013 ◽  
Vol 712-715 ◽  
pp. 1037-1040
Author(s):  
Wei Yu Wang ◽  
Tuo Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Raft Foundation ◽  
The Finite Element Analysis ◽  
Pile Length

The numerical analysis model about pile-raft foundation was bulited by using finite element analysis software.The raft settlement, pile-top counterforce and soil counter force were analyzed by changing the thickness of raft .The thickness were 0.15m,0.20m,0.25m and 0.30m. It was said that it could effectively reduce the raft uneven settlement and realize the redistribution of the pile and soil counterforce by increasing raft thickness.After changing the pile length and the raft thickness The rule of raft settlement were analyzed. After the pile length and thickness of optimization,it was good to control settlement of the pile raft foundation.

scholarly journals Numerical Analysis of Ratcheting Under Bending- Membrane Loading Conditions

2020 ◽  
Vol 01 (01) ◽  
pp. 11-15
Author(s):  
Sajib Kumar Nath ◽  
Md Makfidunnabi ◽  
Md Abdullah Al Bari
Keyword(s):  
Numerical Analysis ◽  
Loading Conditions ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Primary Stress ◽  
Fea Model ◽  
Nonlinear Elastic ◽  
Secondary Membrane ◽  
Incremental Collapse

Ratcheting is a vital failure mode when dynamic loading is present in the scenario and it can lead to fatigue or incremental collapse if not restricted. The purpose of this study is to propose a ratchet diagram for primary bending and secondary membrane loading conditions. For this, a finite element analysis model of a rectangular beam is prepared and solved by the numerical analysis software ‘ABAQUS’. The FEA model is validated by carried out a dynamic nonlinear elastic-plastic analysis with the analytical solution of Yamashita et al. for similar loading conditions. The ratchet occurrence conditions plotted in a non-dimensional stress parameter plot similar to the Bree diagram. The findings suggest that secondary stress rises for the occurrence of ratchet conditions as primary stress decreases. It also found a strong frequency dependency feature. The nature of the input frequency of cyclic loading in the proposed ratchet diagram has been discussed in terms of dynamic displacement over static displacement in the change of non-dimensional frequency of the loading.

scholarly journals Performance validation and dynamic response analysis of a deepwater cable bending restrictor

2020 ◽  
Vol 37 (3) ◽  
pp. 95-101
Author(s):  
Kang Yongtian ◽  
Xiao Wensheng ◽  
Zhang Dagang ◽  
Zhang Liang ◽  
Zhou Chouyao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Numerical Analysis ◽  
Dynamic Response ◽  
Bending Stiffness ◽  
Offshore Wind ◽  
Response Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Cable Structure ◽  
Pipe Model

The deepwater cable bending restrictor is an important protective device for risers, umbilicals and cables in offshore engineering, protecting cable structure by controlling minimum bending radius. Its mechanical properties are analysed based on the numerical analysis model and finite element analysis (FEM) of ø175. The sensitivity analysis of using quantity of bending restrictors is also performed to show the effect of the quantity on bending stiffness. A testing scheme of bending stiffness of the bending restrictor is then formulated based on its structure. From numerical analysis results through test simulation, the tolerance is less than 3 %, which verifies the reliability of the numerical analysis model. Performance of the bending restrictor and dynamic response are analysed according to environmental parameters that occur once per 100 years from offshore wind power farms and pipein-pipe models, respectively. The results show the bending restrictor can effectively protect cable structure, and the pipein-pipe model is suitable for calculating mechanical properties of interaction between the bending restrictor and cable.

scholarly journals Initial validation of the method for simulating the dynamic interaction between pantograph and overhead contact line

2017 ◽  
Vol 2017 (6) ◽  
pp. 34-45
Author(s):  
Danuta Bryja ◽  
Adam Popiołek
Keyword(s):  
Contact Line ◽  
Dynamic Behaviour ◽  
Reference Model ◽  
Dynamic Interaction ◽  
The Other ◽  
Mechanical Parameters ◽  
European Standard ◽  
Limit Values ◽  
Initial Validation ◽  
Simulation Results

The paper presents the results of initial validation of the method for simulating the dynamic interaction between a pantograph and a overhead contact line. According to European Standard EN50318, the first step of validation was done, which consists of comparison of the simulation results with limit values given in European Standard for the reference model. The dynamic behaviour characteristics, in terms of TSI ENE, were calculated from simulated vibrations of the ten-span overhead contact line and the pantograph, and the rate of contact force change in time. Geometrical and mechanical parameters of the overhead contact line and the pantograph were based on the annex to European Standard EN50318. It was proved, that the part of the characteristics meets European Standard requirements and the other slightly exceed the limit values. Based on the analysis, the direction of further research was proposed.

THE STATIC BEHAVIORS AND NUMERICAL PREDICTION ON DISPLACEMENT OF AN EXISTING ARCH DAM

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Nishiuchi Tatsuo
Keyword(s):  
Numerical Analysis ◽  
Load Capacity ◽  
Numerical Prediction ◽  
Arch Dam ◽  
Mechanical Resistance ◽  
Analysis Model ◽  
Element Analysis ◽  
Seismic Safety ◽  
Arch Dams ◽  
Contraction Joints

In order to estimate the seismic safety of existing arch dams, it is essential to assess the static behavior and the mechanical resistance of arch dam. Numerical analysis model for transverse joints (contraction joints) of the arch dam is developed considering the separation, sliding and re-contact behaviors of contraction joints. The static behaviors of an arch dam under annual change of temperature and water level were calculated by using non-linear three-dimensional finite element analysis method that incorporated the developed numerical analysis model of contraction joints. The displacement of the dam body was compared both in analysis and in measured data. At a result, the calculated results can give a good estimation for dam deformation of an existing arch dam caused by those loads. In addition, the effective arch zone was formed under consecutive contraction joints. Thus, the nature of load capacity mechanism was identified. Using these calculated results, the numerical prediction on the displacement of an existing arch dam was proposed for daily management.

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