基于ESMD和快速谱峭度的电机轴承故障诊断

Fault Diagnosis of Motor Bearing Based on ESMD and Fast Kurtogram

针对复杂工况下电机轴承故障特征不明显的问题,提出了一种基于极点对称模态分解算法(Extreme-pointSymmetric Mode Decomposition,ESMD)与快速谱峭度联合分析的电机轴承故障诊断方法。首先将复杂故障信号进行ESMD分解得到若干模态分量(Intrinsic Mode Function,IMF)分量,利用信息熵与相关性选取有效IMF并由其信息熵确定信号重构的权重;利用快速峭度图自适应的确定带通滤波器的最佳滤波频带,对重构信号进行带通滤波;然后解调滤波信号分析,从平方包络谱中提取出相应故障的特征频率。最后通过试验分析表明,该方法可对故障信号进行有效降噪并提取出电机轴承故障特征,诊断出故障类型。

Aiming at the fault diagnosis of motor bearings in complex conditions,a fault diagnosis method for motor bearings based on the joint analysis of Extreme-point Symmetric Mode Decomposition(ESMD)and fast spectral kurtosis was proposed.First,a number of modal components(Intrinsic Mode Function,IMF)components were obtained by ESMD decomposition of the fault signal of motor bearing,and IMF was selected by information entropy and correlation,and the weight of the signal reconstruction was determined by its information entropy,and the best filter band of bandpass filter was selected by the fast kurtosis map,and the band pass of the reconstructed signal was carried out.Filtering,demodulation analysis,and extracting the fault characteristic frequency from the squared envelope spectrum.Finally,the experimental analysis shows that the method can effectively denoise the fault signal and extract the fault characteristics of the motor bearing,and diagnose the fault type.