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

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (14) : 169-175.

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

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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.

Key words

Continuous variable loads / Multiscale / Morphological filtering / Hydraulic pump

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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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