|Table of Contents|

Identification method of wheel flat based on Hilbert-Huang transform(PDF)

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

Issue:
2012年04期
Page:
33-41
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Identification method of wheel flat based on Hilbert-Huang transform
Author(s):
LI Zhong-ji;  WEI Lai;  DAI Huan-yun;  ZENG Jing;  WANG Yi-jia
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
Keywords:
rail vehicle;  wheel flat;  Hilbert-Huang transform;  axle box vibration;  identification of wheel flat 0 Introduction
PACS:
U270.7
DOI:
-
Abstract:
Vehicle system dynamics model with 56 degrees of freedom and wheel flat model were set up to compute vehicle dynamic responses. HHT(Hilbert-Huang transform)spectrum characteristics of axle box vibration caused by wheel flat impact were studied by using HHT time-frequency analysis method. HHT spectrum characteristics of axle box vertical accelerations caused by wheel flat and out-of-round were compared. The influences of vehicle running speed and track excitation on HHT spectrum characteristics of axle box vibration caused by wheel flat impact were studied. Analysis result shows that HHT spectrum distribution of axle box acceleration is uniform for healthy wheel, the stripe interval of vertical bar distribution for flat wheel is inversely proportional with the speed, and transverse bar distribution for out-of-round wheel. Therefore, wheel flat can be identified according to HHT spectrum characteristics of axle box acceleration. The lowest distinguishable frequencies are 30, 50, 80 Hz for Beijing-Tianjian Line irregularity, existing line irregularity in China and American three-grade track irregularity respectively. The identification band is 40-100 Hz when the running speed is lower than 150 km·h-1, but it should be widened to 200 Hz when the speed is over 150 km·h-1. 1 tab, 14 figs, 12 refs.

References:

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Last Update: 2012-08-30