|Table of Contents|

Fatigue failure mechanism and improvement method of safety suspender mounting base of speed-up passenger car bogie(PDF)

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

Issue:
2018年01期
Page:
71-78
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Fatigue failure mechanism and improvement method of safety suspender mounting base of speed-up passenger car bogie
Author(s):
LIAN Qing-lin;  LIU Zhi-ming;  WANG Wen-jing
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Keywords:
vehicle engineering;  speed-up passenger car;  bogie;  safety suspender mounting base;  modal analysis;  vibration fatigue;  dynamic stress
PACS:
U270.33
DOI:
-
Abstract:
The fatigue crack characteristics in the vicinity of bolt hole on the safety suspender mounting base of speed-up passenger car bogie were analyzed. A hypothesis was proposed that the structural vibration fatigue caused by resonant phenomena is the most important reason of the crack initiation in the position. The first 1-10 order modes’ vibration shapes of safety suspender were obtained by using finite element simulation. The frequency of each order mode was analyzed. Field tests on acceleration and dynamic stress were conducted. The equivalent stresses and accelerations as well as their dominant frequencies were obtained. Field test results were compared and analyzed with FE simulation result. Based on the command of failure mechanism of safety suspender mounting base, the structure of safety suspender and the way of connection were optimized by using structure improvement and connection adjustment. Field line tests were applied to the new structures, and the safety and economy were evaluated. Analysis result shows that because of the influence of track line conditions of normal passenger car, the vibration frequency of safety suspender, which is 91.78 Hz for acceleration and 91 Hz for dynamic stress, is very similar to the fourth order mode frequency(95.79 Hz)calculated by FE simulation, so that the resonance occurs. The longitudinal acceleration power spectral density of safety suspender is much higher than its lateral value and vertical value, which corresponds to the running direction of train, so crack initiation in the vicinity of safety suspender mounting base is resulted from vibration fatigue. The equivalent stress amplitudes can reduce effectively while placing 5 mm shims on both sides of bolt hole and altering the steel plate bending structure with flexible wire rope structure, and less fatigue damage accumulates. The improved safety suspender can meet the application requirement of running 12 million kilometers, and economic benefit is better. 2 tabs, 17 figs, 25 refs.

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Last Update: 2018-03-28