基于短时傅里叶变换的汽车零部件耐久性载荷信号编辑方法

doi:10.3901/JME.2019.04.126

机械工程学报 ›› 2019, Vol. 55 ›› Issue (4): 126-134.doi: 10.3901/JME.2019.04.126

基于短时傅里叶变换的汽车零部件耐久性载荷信号编辑方法

朱茂桃¹, 吴新佳¹, 郑国峰², 李利平², 韩鹏飞³, 上官文斌^2,3

1. 江苏大学汽车与交通工程学院镇江 212013;
2. 华南理工大学机械与汽车工程学院广州 510641;
3. 宁波拓普集团股份有限公司宁波 315800

收稿日期:2017-08-04 修回日期:2018-03-01 出版日期:2019-02-20 发布日期:2019-02-20
通讯作者: 上官文斌(通信作者),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、粘弹性、弹塑性建模和复合耦合系统动力学特性计算分析。E-mail:sgwb@163.com
作者简介:朱茂桃,男,1963年出生,博士,教授,硕士研究生导师。主要研究方向为车辆现代设计理论与方法,汽车底盘零部件载荷信号采集及耐久性试验方法。E-mail:zhumt@ujs.edu.cn
基金资助:
国家自然科学基金资助项目（11472107，51275175）

Load Signal Edition Method Based on the Short-time Fourier Transform to Durability Test of Vehicle Component

ZHU Maotao¹, WU Xinjia¹, ZHENG Guofeng², LI Liping², HAN Pengfei³, SHANGGUAN Wenbin^2,3

1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013;
2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641;
3. Ningbo Tuopu Group Co., Ltd, Ningbo 315800

Received:2017-08-04 Revised:2018-03-01 Online:2019-02-20 Published:2019-02-20

摘要/Abstract

摘要： 为了保证汽车零部件耐久性试验能够真实复现零件的服役载荷，并将试验场所测得的实际载荷-时间历程信号编辑成有效的缩减载荷信号，提出基于短时傅里叶变换的汽车零部件载荷信号编辑方法。对零件载荷信号进行短时傅里叶变换，得到该载荷信号的累积功率谱密度。利用累积功率谱密度来识别并提取损伤贡献大的片段，得到零件的缩减载荷信号。以汽车动力总成后拉杆悬置载荷-时间历程信号为例，采用基于短时傅里叶变换和基于损伤保留两种方法来编辑载荷信号。结果表明，在伪损伤保持一致的前提下，相比基于损伤保留方法，基于短时傅里叶变换方法得到的缩减载荷信号时间长度更短，且在统计参数（均值、方均根与峰度系数）和信号幅值域等方面均与原始载荷信号一致性更高。应用该缩减载荷信号建立汽车动力总成后拉杆悬置的耐久性台架试验，验证该套方法的有效性。

关键词: 短时傅里叶变换, 耐久性试验, 汽车零部件, 遗传算法, 载荷信号编辑

Abstract: In order to ensure the durability test of the vehicle component reflects service loads actually and the compression load signal is effective, a method of editing the load signal of vehicle components based on short time Fourier transform is proposed. The accumulative power spectral density of the original load signal is obtained by short-time Fourier transform. The accumulative power spectral density is used to identify and extract the damage parts from the original load signal, and a compression load signal is created. Based on the load signal of the engine mount, this method and the damage retention method are applied to edit the load signal. The results show that, the compression load signal based on short-time Fourier transform with a shorter length of time contain almost same damage of the original load signal, and it has similar statistical parameters including mean value, root mean square and kurtosis as well as the amplitude domain of the original load signal. The engine mount bench iteration test is established by using the compression load signal, and the effectiveness of the method is verified.

Key words: durability test, genetic algorithm, load signal edition method, short-time Fourier transform, vehicle components

中图分类号:

U467

朱茂桃, 吴新佳, 郑国峰, 李利平, 韩鹏飞, 上官文斌. 基于短时傅里叶变换的汽车零部件耐久性载荷信号编辑方法[J]. 机械工程学报, 2019, 55(4): 126-134.

ZHU Maotao, WU Xinjia, ZHENG Guofeng, LI Liping, HAN Pengfei, SHANGGUAN Wenbin. Load Signal Edition Method Based on the Short-time Fourier Transform to Durability Test of Vehicle Component[J]. Journal of Mechanical Engineering, 2019, 55(4): 126-134.

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基于短时傅里叶变换的汽车零部件耐久性载荷信号编辑方法

Load Signal Edition Method Based on the Short-time Fourier Transform to Durability Test of Vehicle Component

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