Multi-information fault feature extraction method for hydraulic pumps based on the vibration intensity

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (14) : 269-276.

LIU Si-yuan^1,2 , LI Xiao-ming^1,2 , LIU Jian-xun^1,2 , ZHANG Jian-jiao^1,2 , ZHAO Jing-yi^1,2

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Abstract

The single information fault feature extraction usually shows the fuzziness and incompleteness, so that the working state of hydraulic pumps can not be evaluated accurately. Therefore, a multisensor information feature extraction method based on the vibration intensity theory was proposed. By means of the physical quantity conversion method, the filtered flow signals and pressure signals at the pump outlet were converted into speed signals and acceleration signals respectively. By using the frequency domain calculation method for the vibration intensity, the intensity factors of vibration, flow and pressure signals were extracted and the sensitivity of the intensity characteristic factors was analysed. The wear failure of a slipper was taken as an example ,and it is found the intensity factor is quite sensitive to faults. The study is of significance to increase the completeness of information and improve the accuracy of state assessment.

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Multi-sensor information / Axial piston pump / The vibration intensity / Feature extraction / Sensitivity analysis

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LIU Si-yuan1,2 LI Xiao-ming1,2 LIU Jian-xun1,2 ZHANG Jian-jiao1,2 ZHAO Jing-yi1,2. Multi-information fault feature extraction method for hydraulic pumps based on the vibration intensity[J]. Journal of Vibration and Shock, 2018, 37(14): 269-276

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