|Table of Contents|

Influence rule of dynamic stress of high-speed train gearbox housing(PDF)

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

Issue:
2019年01期
Page:
85-95
Research Field:
Publishing date:

Info

Title:
Influence rule of dynamic stress of high-speed train gearbox housing
Author(s):
WANG Wen-jing1;  LI Guang-quan2;  HAN Jun-chen3;  LI Qiu-ze3
(1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, Shandong, China; 3. CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, Jilin, China )
Keywords:
high-speed train;  gearbox housing;  running speed;  line condition;  wheel profiling;  dynamic stress;  equivalent stress;  acceleration
PACS:
U260.332
DOI:
-
Abstract:
The influence rules of running speed, line condition and wheel profiling on the dynamic stress of gearbox housing were studied based on the line test, and the change rule of dynamic stress of gearbox housing was analyzed combined with the vibration acceleration of axle box. Analysis result shows that the amplitude spectrums of dynamic stress of gearbox housing and the vertical acceleration of axle box are the same, and the main frequency is 570 Hz, which reflects that the dynamic stress level of the housing is closely related to the high frequency excitation caused by wheel-rail interaction. When the train running speed increases from 200 km·h-1 to 300 km·h-1, the stress amplitude of gearbox housing shows an increasing trend, especially in the tooth surface inspection hole of cracking housing. The equivalent stress increases from 5.56 MPa to 16.67 MPa, which is about 2 times larger. The irregularity caused by the rail wear has a great influence on the vibration of axle box and gearbox housing. When the train is running from worn line to grinding line, the vibration amplitude level of axle box in high frequency stage obviously reduces, and the equivalent stress of key point of the housing reduces from 16.26 MPa to 10.16 MPa, which decreases by 38%. The high frequency(550-650 Hz)excitation caused by the high-order polygon of the wheel at high speed(300 km·h-1)causes the high frequency vibration, the dynamic stress and equivalent stress of the housing increase substantially, and the equivalent stress of key point of the housing decreases from 17.45 MPa to 8.56 MPa before and after wheel profiling, which decreases by 51%. So rail grinding and wheel profiling can improve the stress state of gearbox housing. Therefore, reasonable rail grinding and wheel profiling cycle can effectively prolong the fatigue life of gearbox housing. 24 figs, 33 refs.

References:


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Last Update: 2019-02-28