|Table of Contents|

Dynamics modeling of asymmetrical tension and compression characteristics of gas-hydraulic and ring spring combined draft gear and impact simulation(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年04期
Page:
172-182
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Dynamics modeling of asymmetrical tension and compression characteristics of gas-hydraulic and ring spring combined draft gear and impact simulation
Author(s):
SUN Shu-lei1; 2;  LI Fu3;  WANG Guang-chao4;  TIAN Guo-ying1; 2;  DENG Peng-yi1; 2;  MI Cai-ying3
(1. School of Automobile and Transportation, Xihua University, Chengdu 610039, Sichuan, China; 2. Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology of Sichuan, Xihua University, Chengdu 610039, Sichuan, China; 3. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 4. CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd., Qingdao 266031, Shandong, China)
Keywords:
vehicle engineering;  gas-hydraulic draft gear;  ring spring draft gear;  characteristic of draft gear;  dynamics model;  impact dynamics
PACS:
U270.34
DOI:
10.19818/j.cnki.1671-1637.2021.04.013
Abstract:
A dynamics model of a gas-hydraulic and ring spring combined draft gear was established to simulate the asymmetric dynamic tension and compression characteristics of the gear.Based on the characteristics of different energy-absorbing elements,a vehicle impact dynamics model program was compiled using MATLAB/Simulink software, and the impact dynamic characteristics of two vehicles and two groups of EMUs were evaluated. Research results show that the linear loading characteristics of the ring spring draft gear under tension can be simulated precisely. Moreover, the varying nonlinear characteristics of the gas-hydraulic draft gear with impact speed under compression can be simulated satisfactorily using the combined draft gear dynamics model. The asymmetric tension and compression characteristics are shown in the combined draft gear dynamics model. Under low-speed and medium/high-speed impacts, the dynamic energy absorption process and hysteresis tension-compression characteristic curve can be entirely and effectively simulated using a combined draft gear dynamics and vehicle impact model. This is caused by the deformation of the draft gear, crushing tube, anticlimbing device, and vehicle body structure in sequence. When the impact speed is 5 km·h-1, the maximum coupler force and the maximum stroke of the combined draft gear are lower than the resistance force and stroke limit, and the loading characteristic curve of the gas-hydraulic draft gear only exhibits compression loading characteristics. When the impact speed is 20 km·h-1, the maximum coupler force is 2 900 kN, the maximum stroke is 534 mm, and the anticlimbing device is triggered. The continuous mechanical characteristics of the gas-hydraulic draft gear, crushing tube, and anticlimbing device are exhibited in the compression-loading characteristics curve, and the structure of the vehicle body is not damaged. When the impact speed reaches 25-30 km·h-1, the vehicle body structure is deformed, and the coupler force increases sharply. The structural safety of the vehicle body can be satisfied through the parameter selection of the fully automatic coupler and semi-permanent coupler within an impact speed of 20 km·h-1.2 tabs, 12 figs, 33 refs.

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Last Update: 2021-09-01