持续可变载荷条件下液压泵故障信号的多尺度形态滤波分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (14) : 169-175.

论文

刘思远1, 2, 王闯1, 2, 姜万录1, 2, 张文文2

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Multiscale Morphological Filtering Analysis on Fault Signals of the Hydraulic Pump under the Continuous Variable Loads

LIU Si-yuan1, 2, WANG Chuang1, 2, JIANG Wan-lu1, 2, ZHANG Wen-wen2

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文章历史 +

摘要

改变液压系统载荷的大小会使液压泵振动信号的幅值发生变化，从而引起信号振动特征发生改变，因此，单一尺度结构元素的数学形态学方法对液压泵变载荷条件下的信号滤波不一定有效。为此在单尺度形态分析方法的基础上，同时兼顾长度（时间）和高度（幅值）两种尺度对持续可变载荷条件下泵的振动信号进行多尺度形态滤波。以冲击特征比值和二阶原点矩为特征指标构建的复合评价体系为依据，提出结构元素长度和高度尺度的寻优方法。对持续可变载荷条件下的液压泵进行了故障模拟试验，检验了多尺度形态分析方法对液压泵正常状态、单柱塞滑靴磨损以及中心弹簧失效三种不同状态信号的滤波效果。通过与单尺度形态滤波方法相比较，证实了多尺度形态滤波方法更适合于处理液压泵变载荷条件下的振动信号。

Abstract

The method of mathematical morphology of the single-scale structural elements may not be effective for the filtering analysis on signals of the hydraulic pump under the variable loads. Because the amplitude of the vibration signal of the hydraulic pump will change with the loads of the hydraulic system, which affects the vibration characteristics of the signal. Based on the method of the single-scale morphological analysis, taking into consideration the length scale(time) and height scale(amplitude), the vibration signals of the pump were analyzed by multiscale morphological filter. Taking the impact feature ratio and second geometric moment as characteristic index, the composite evaluation system was constructed . And based on that, the optimization method of structural elements length scale and height scale was proposed. The fault simulation tests of the hydraulic pump under the variable loads were carried out, and the filtering effects of the multiscale morphological analysis algorithm for the three different signals, the hydraulic pump in normal state, single-piston slipper wear and the center spring failure, were checked. By comparison with the single-scale morphological filtering method, it was indicated that the multiscale morphological filtering method is more suited to handle the vibration signal under variable loads conditions.

导出引用

刘思远1, 2, 王闯1, 2, 姜万录1, 2, 张文文2. 持续可变载荷条件下液压泵故障信号的多尺度形态滤波分析[J]. 振动与冲击, 2016, 35(14): 169-175

LIU Si-yuan1, 2, WANG Chuang1, 2, JIANG Wan-lu1, 2, ZHANG Wen-wen2. Multiscale Morphological Filtering Analysis on Fault Signals of the Hydraulic Pump under the Continuous Variable Loads[J]. Journal of Vibration and Shock, 2016, 35(14): 169-175

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