|Table of Contents|

Safety analysis of railway vehicle in leakage process of air spring(PDF)

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

Issue:
2012年03期
Page:
60-66
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Safety analysis of railway vehicle in leakage process of air spring
Author(s):
GAO Hao;  LUO Ren;  CHI Mao-ru;  DAI Huan-yun
Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
Keywords:
vehicle engineering;  air spring;  leakage process;  vehicle dynamics;  stick-slip model;  stiffness decay;  running security
PACS:
U270.11
DOI:
-
Abstract:
The leakage model of air spring with stiffness decay characteristics and the nonlinear stick-slip contact model were established. The dynamic process in loss of gas and the state of emergency after loss of gas were simulated by combining the two models with vehicle system dynamics. The stability of vehicle system with air spring failure was analyzed. The impact of air spring's sudden leakage on the dynamics performance of vehicle was simulated. The running safeties of vehicle under different times of loss of gas, different speeds and curve negotiation conditions were studied. Analysis result shows that the critical speed of vehicle system with air spring failure significantly decreases from 623 km·h-1 to 351 km·h-1. Because of air spring's sudden leakage, wheel-rail vertical force decreases and reduction rate of wheel load increases. The shorter the leakage process is, the greater reduction rate of wheel load is. It reaches 0.651 when the leakage time is 0.2 s. The influence of speed on reduction rate of wheel load and wheel-rail force is not obvious when vehicle speed is less than 300 km·h-1. But, when it is greater than 300 km·h-1, reduction rate of wheel load increases rapidly with speed increase. Leakage occuring on circular curve is most dangerous when vehicle runs, and the maximum of reduction rate of wheel load is 0.652. 2 tabs, 12 figs, 15 refs.

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Last Update: 2012-06-30