基于小波-平滑能量算子解调的液压泵故障分析

Fault Analysis Based on Wavelet-smoothed Energy Operator Demodulation for Hydraulic Pump

在对液压泵的常见故障进行机理分析的基础上,针对液压泵振动信号出现的调制现象以及Hilbert变换解调的非瞬时响应特性,提出基于小波-平滑能量算子解调的液压泵故障分析方法。首先对采集到的液压泵壳体的振动信号进行小波分解,并对高频系数进行重构以获得高频信号分量;然后对高频信号分量进行平滑能量算子解调;最后对解调得到的瞬时幅值进行频谱分析,判断液压泵的工作状态和故障类型。实验结果表明,该方法能实现液压泵正常、滑靴松动、滑靴磨损三种状态的分类,是进行液压泵故障诊断行之有效的方法。

On the basis of analyzing the common fault mechanism of hydraulic pumps,aiming at the modulation phenomenon of vibration signal in hydraulic pumps and the non-instantaneous response characteristic of Hilbert transform demodulation,we put forward a fault analysis method based on the wavelet-smoothed energy operator demodulation.According to the method,the vibration signal is decomposed by the wavelet function,and the high frequency coefficient is reconstructed to a high frequency signal component.Then,the high frequency signal component is demodulated by the smoothed energy operator; finally,the working conditions and fault types of the pump are determined by the amplitude spectrums analysis.The experimental results show that the three modes of no fault,slipper loosing fault and slipper wearing fault can be correctly identified.