正弦加载液压泵故障振动信号的阶比多尺度形态滤波方法研究

 液压泵在变载荷作用下会引起转速波动且发生幅值调制现象，振动信号呈现出明显的非平稳性，传统的滤波方法难于进行有效滤波。针对正弦加载液压泵故障振动信号提出一种阶比多尺度形态滤波方法，利用基于EEMD理论的时频阶比分析方法将正弦加载液压泵故障振动非平稳信号转化成角域平稳信号，再用多尺度形态滤波方法对角域平稳信号进行多尺度寻优和解调处理获得多尺度解调信号，并进行阶次谱分析得到振动信号的特征阶次。通过实验证实，该方法能对正弦加载液压泵故障振动信号进行有效滤波，且能提取出更多的有用故障信息。

Order Ratio Multiscale Morphological Filtering Method of Fault Vibration Signal for Hydraulic Pump Under Sinusoidal Loading Condition

When a hydraulic pump is subjected to a variable load, it will cause speed fluctuation and amplitude modulation, and the vibration signal shows obvious non stationary. Traditional filtering methods are difficult to effectively filter. An order ratio multiscale morphological filtering method is proposed for fault vibration signal of hydraulic pump under sinusoidal loading condition. The time frequency order analysis method based on the EEMD theory is used to transform faulty vibration non stationary signal of sinusoidal loading hydraulic pump into angular stationary signal. The multiscale morphological filtering method is used to obtain multiscale demodulated signals by multiscale optimization and demodulation of angular stationary signals. And the order spectrum analysis is performed to obtain the characteristic order of vibration signal. The experimental results show that this method can effectively filter the fault vibration signal of sinusoidal loading hydraulic pump and can extract more useful fault information.