基于高阶循环平稳的柴油发动机活塞销振动信号分析

中国机械工程 ›› 2010, Vol. 21 ›› Issue (12): 1410-1414.

基于高阶循环平稳的柴油发动机活塞销振动信号分析

夏天1;王新晴1;肖云魁2;梁升1

1.解放军理工大学,南京,210007

2.解放军军事交通学院,天津,300161

出版日期:2010-06-25 发布日期:2010-07-01

Analysis of Vibration Signals of Piston Pin in Diesel Engine Based on Higher Order Cyclostationarity

Xia Tian1;Wang Xinqing1;Xiao Yunkui2;Liang Sheng1



1.PLA University of Science and Technology,Nanjing,210007

2.Academy of Military Transportation,Tianjin,300161

Online:2010-06-25 Published:2010-07-01

摘要/Abstract

摘要：

分析了柴油发动机活塞销振动信号的高阶循环平稳性,提出了一种基于高阶循环平稳理论提取柴油发动机活塞销磨损故障特征的新方法。利用循环双谱分析活塞销振动信号,考察了振动信号循环双谱图中频率成分的分布情况。定义循环双谱图中幅值的平均累加值与发动机活塞销磨损间隙变化相对应的区域为特征频率平面,提出一种全局搜索策略以搜索特征频率平面。仿真结果及试验结果表明了循环双谱的有效性。利用所述方法在实际活塞销振动信号的循环双谱图中提取的5个特征频率平面内幅值的平均累加值可以作为活塞销磨损故障诊断的特征值。

关键词:

高阶循环平稳, 循环双谱, 柴油发动机, 活塞销, 故障诊断



Abstract:

Higher order cyclostationarity of the vibration signals of the piston pin of a diesel engine was studied, and a novel feature extraction method of diesel engine’s piston pin’s wear fault based on the higher order cyclostationarity was proposed herein.Vibration signals of piston pin were analysed with the cyclic bispectrum, the frequency component’s distribution of the vibration signals in the cyclic

bispectrum was studied, and a new global search method was proposed.The cyclic bispectrum characteristic planes whose average modulus values can reflect the wear clearances of the piston pin were found as fault features. The results demonstrate the effectiveness of the cyclic bispectrum method, and 5 cyclic bispectrum planes connecting with the wear clearances of the piston pin are found in the vibration signals’ cyclic bispectrum and the average modulus values of these planes can be extracted as the feature of the crankshaft bearing wear fault of diesel engine.

Key words: higher order cyclostationarity, cyclic bispectrum, diesel engine, piston pin, fault diagnosis

中图分类号:

夏天, 王新晴, 肖云魁, 梁升.

基于高阶循环平稳的柴油发动机活塞销振动信号分析

[J]. 中国机械工程, 2010, 21(12): 1410-1414.

JIA Tian, WANG Xin-Qing, XIAO Yun-Kuai, LIANG Sheng.

Analysis of Vibration Signals of Piston Pin in Diesel Engine Based on Higher Order Cyclostationarity

[J]. China Mechanical Engineering, 2010, 21(12): 1410-1414.

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