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Experimental study of hydraulic cylinder leakage and fault feature extraction based on wavelet packet analysis

机译：基于小波包分析的液压缸泄漏及故障特征提取实验研究

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摘要

Hydraulic cylinder is the actuator in hydraulic system, and its failure directly affects the normal operation of the system. The leakage of hydraulic cylinder is a major failure mode usually caused by failure or damage of the seal, and it should be detected as early as possible to avoid worse breakdowns of system. However, the leakage is difficult to be diagnosed in the early stage, so the basic aim of the paper is to seek out the fault features which could forecast the early leakage of hydraulic cylinder. In this study, inlet and outlet pressure signals and displacement signal of piston rod of hydraulic cylinder have been collected from a special designed test-bed, which simulates different leakage levels of hydraulic cylinder. The result shows that there are five fault features in total can be extracted by wavelet packet analysis to distinguish different levels of the leakage obviously.
机译：液压缸是液压系统中的执行器，其故障直接影响系统的正常运行。液压缸的泄漏是主要的故障模式，通常是由于密封件的故障或损坏而引起的，应尽早发现，以免造成系统故障。但是，泄漏是很难早期诊断的，因此本文的基本目的是寻找可以预测液压缸早期泄漏的故障特征。在这项研究中，从专门设计的试验台上收集了液压缸活塞的进出口压力信号和位移信号，该试验台模拟了液压缸的不同泄漏水平。结果表明，通过小波包分析可以提取出总共五种故障特征，从而明显区分出不同程度的泄漏。

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