基于Hilbert-Huang变换的车轮扁疤识别方法(英文)  

Identification method of wheel flat based on Hilbert-Huang transform

作　　者：李忠继[1] 魏来[1] 戴焕云[1] 曾京[1] 王忆佳[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《交通运输工程学报》2012年第4期33-41,共9页Journal of Traffic and Transportation Engineering

基　　金：National Key Basic Research and Development Plan of China(973Program)(20011CB711106);National Key Technology R&D Program in the 11th Five-year Plan of China(2009BAG12A02-E01-1)

摘　　要：建立了56自由度车辆动力学模型和车轮扁疤模型,计算了车辆的动态响应,采用HHT时频分析方法研究了扁疤冲击引起的轴箱振动的HHT谱特征,对比了车轮扁疤和车轮不圆的HHT谱特征之间的差异,并分析了车辆运行速度和轨道激励对扁疤冲击振动的HHT谱的影响。分析结果表明:健康车轮轴箱加速度的HHT谱呈现均匀分布,带有扁疤车轮的轴箱加速度的HHT谱呈现纵向条带分布,条带间隔与车速成反比,车轮不圆的轴箱加速度呈现横向条带分布,故根据轴箱加速度的HHT谱特征可以识别扁疤车轮。在京津线、国内既有线和美国三级谱上,最低可辨识频率分别为30、50、80Hz。车辆运行速度在150km.h-1以下时辨识频段取为40～100Hz,车辆运行速度在150km.h-1以上时辨识频段应加宽至200Hz。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.

关 键 词：轨道车辆 车轮扁疤 HILBERT-HUANG变换 轴箱振动 车轮扁疤识别 

分 类 号：U270.7[机械工程—车辆工程]