基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究

doi:10.3901/JME.2018.10.156

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 156-166.doi: 10.3901/JME.2018.10.156

基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究

郑国峰¹, 上官文斌^1,2, 韩鹏飞², AHMED Waizuddin¹

1. 华南理工大学机械与汽车工程学院广州 510641;
2. 宁波拓普集团股份有限公司宁波 315800

收稿日期:2017-06-02 修回日期:2017-11-20 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 上官文斌(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为汽车振动分析方法与控制,汽车设计理论与方法;超弹性、黏弹性、弹塑性建模和复杂耦合系统动力学特性计算分析。E-mail:sgwb@163.com
作者简介:郑国峰,男,1989年出生,博士研究生。主要从事汽车底盘零部件载荷谱采集及耐久性试验方法研究。E-mail:zhengguofeng1989@163.com
基金资助:
国家自然科学基金（51275175）资助项目。

Study of Multi-axis Load Spectrum Edition Method Based on the Wavelet Transform to the Accelerated Durability Test of the Vehicle Components

ZHENG Guofeng¹, SHANGGUAN Wenbin^1,2, HAN Pengfei², AHMED Waizuddin¹

1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 501641;
2. Ningbo Tuopu Group Co., Ltd., Ningbo 315800

Received:2017-06-02 Revised:2017-11-20 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 开展基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法的研究。提出一种修正重采样的载荷谱预处理方法，该方法能够消除重采样因峰谷值漏采带来的信号损伤计算误差。将预处理后的零件载荷谱进行小波分解，分解后的高频小波系数进行重构得到高频小波分量，基于高频小波分量，利用包络线损伤成分识别方法，提取出原始信号中对零件损伤有较大贡献的部分，得到零件的编辑载荷谱。基于小波变换的多轴载荷谱编辑方法得到的压缩信号，在伪损伤保留量、统计参数、穿级计数分析及功率谱密度等方面均与原始信号有较好的一致性，并且没有改变通道之间的相位关系，可以达到与原始信号相同的加载效果。通过控制臂的疲劳仿真计算，进一步验证编辑载荷谱与原始载荷谱具有相同的加载效果。该编辑方法可用于汽车零部件的加速耐久性试验研究中。

关键词: 包络线损伤识别法, 多轴载荷谱编辑, 耐久性研究, 汽车零部件, 小波变换

Abstract: The multi-axis load spectrum edition based on the wavelet transform to the vehicle component accelerated durability test is introduced. And a modified resampling method is proposed to preprocess the acquisited load spectrum. Some peak and valley points of the load spectrum are ignored in the general resampling method. And these neglecting points will lead to the damage calculation error of the load spectrum. The modified resampling method eliminates the error of damage calculation through reassign the neglected peak and valley points. After the resampling, wavelet decomposition is conducted to the load spectrum. The high frequency wavelet component is obtained by the load spectrum wavelet transformation. And the envelope damage identification method is used to identify the damage contribution parts of the load spectrum by setting a threshold value to the high frequency wavelet component. The shorten load spectrum is obtained by organizing the most the damage contribution parts identified before. The edition load spectrum based on the wavelet transform edition method has the similar parameters including pseudo-damage, mean value, root mean square and kurtosis as well as the energy to the original spectrum. It is illustrated that the edited load spectrum has the same effect to the original one. The proposed load spectrum edition method can be used in the accelerated durability test research of all the vehicle components.

Key words: durability research, envelope damage identification method, multi-channel load spectrum edition method, vehicle components, wavelet transform

中图分类号:

TN911

郑国峰, 上官文斌, 韩鹏飞, AHMED Waizuddin. 基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究[J]. 机械工程学报, 2018, 54(10): 156-166.

ZHENG Guofeng, SHANGGUAN Wenbin, HAN Pengfei, AHMED Waizuddin. Study of Multi-axis Load Spectrum Edition Method Based on the Wavelet Transform to the Accelerated Durability Test of the Vehicle Components[J]. Journal of Mechanical Engineering, 2018, 54(10): 156-166.

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基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究

Study of Multi-axis Load Spectrum Edition Method Based on the Wavelet Transform to the Accelerated Durability Test of the Vehicle Components

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