基于EMD包络谱分析的液压泵故障诊断方法

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (9) : 44-48.

论文

基于EMD包络谱分析的液压泵故障诊断方法

唐宏宾1,2，吴运新1，滑广军1，马昌训1

作者信息 +

Fault Diagnosis of Pump Using EMD and Envelope Spectrum

Tang Hong-bin1,2，Wu Yun-xin 1，Hua Guang-jun 1，Ma Chang-xun 1

Author information +

文章历史 +

摘要

在对液压泵常见故障模式进行分析的基础上，针对液压泵早期故障诊断时故障特征信号微弱且传统的包络分析需要预先依靠经验确定分析频段的问题，提出了基于经验模式分解(EMD)和包络谱分析的诊断方法。该方法首先将采集到的液压泵壳体的振动信号利用EMD分解为有限个固有模式函数(IMF)之和；然后对前几个IMF分量进行包络分析，并求出包含主要故障信息的包络谱；最后通过对包络谱的分析，判断液压泵的工作状态和故障类型。实验结果表明，该方法有效提取了液压泵的早期故障特征，准确实现了液压泵正常、滑靴松动、滑靴与斜盘磨损及缸体与配流盘磨损四种状态的分类，是进行液压泵故障诊断行之有效的方法。

Abstract

On the basis of failure mechanism of pump and aiming at the difficulty in early fault diagnosis of pump, the fault characteristic signal is weak and the traditional envelope analysis need to to determine frequency bandwidth rely on experience. A fault diagnosis approch based on empirical mode decomposition(EMD) and envelope spectrum is proposed. According to the method, the vibration signal is decomposed into some intrinsic mode function (IMF) using EMD at first.Then the first IMF is envelope analyzed and the envelope spectrum is obtained which include the main fault information. Finally, the working conditions and fault types of the pump is determined by the analysis of the envelope spectrum. The experimental results show that the early fault characteristics of the pump is extracted effectively and four modes of no fault, slipper loosing fault, swashplate wearing fault and valve plate wearing fault are correctly identified.

导出引用

唐宏宾;吴运新;滑广军;马昌训. 基于EMD包络谱分析的液压泵故障诊断方法[J]. 振动与冲击, 2012, 31(9): 44-48

Tang Hong-bin;Wu Yun-xin;Hua Guang-jun;Ma Chang-xun . Fault Diagnosis of Pump Using EMD and Envelope Spectrum [J]. Journal of Vibration and Shock, 2012, 31(9): 44-48