Morphological Filtering Method for Vibration Signals of Hydraulic Pump under Sinusoidal Variable Load Conditions

Abstract

Abstract: Vibration characteristics of the pump vibration signals would change when they suffered a significant variable loads, especially in the role of sinusoidal load changes, and would produce amplitude modulation phenomenon. The filtering effects of the traditional single-scale structure element morphological methods was not necessarily ideal to this kind of signals. Therefore, for vibration signal characteristics of sinusoidal load pump, on the basis of the single-scale morphological analysis, a multi-scale morphological filtering method was proposed, which took both of length and height scale of the morphological structure elements. Firstly, taking the impact feature ratio and second geometric moment as characteristic index, then, the optimization method of structural elements length scale and height scale was proposed, which determined the optimal length and height scale operator combination. Afterwards, filtering the sinusoidal load simulation signals and variable load hydraulic pump failure vibration signals using the optimal scale combination, the results confirm that the filtering effectiveness is better than that of single-scale filtering method.

Key words: variable load, hydraulic pump, morphological filtering, multiscale

摘要： 液压泵的振动信号在受到大幅度变载荷作用时将引起振动特征的变化，特别是在正弦载荷变化的作用下，将会产生幅值调制现象。采用传统的单一尺度结构元素的形态学方法对该类信号进行滤波的效果不一定理想。因此，针对正弦载荷液压泵振动信号的特点，在单尺度形态滤波分析方法的基础上，提出了兼顾形态学结构元素长度和高度尺度的多尺度形态学滤波方法。首先，以冲击特征比值和二阶原点矩作为评价指标，提出综合考虑结构元素长度和高度尺度的寻优方法，确定最优长度和高度尺度算子组合。然后，用最优尺度组合对正弦载荷模拟仿真信号和变载荷液压泵故障振动信号进行滤波处理，分析结果证实其滤波效果优于单尺度滤波方法滤波效果。

关键词: 变载荷, 液压泵, 形态滤波, 多尺度

CLC Number:

TP277

Liu Siyuan, Yang Mengxue, Wang Chuang, Zhang Wenwen. Morphological Filtering Method for Vibration Signals of Hydraulic Pump under Sinusoidal Variable Load Conditions[J]. China Mechanical Engineering.

刘思远, 杨梦雪, 王闯, 张文文. 正弦变载荷工况下液压泵振动信号的形态学滤波方法[J]. 中国机械工程.

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