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De-noising and extraction of the weak signature are crucial to fault diagnostics in which case features are often very weak and masked by noise. The wavelet transform has been widely used in signal de-noising due to its extraordinary time-frequency representation capability. In this paper, wavelet decomposition-based de-noising method is employed for fault feature extraction of hydraulic pump. The...
Considering the drawback of the big error when using fixed threshold in fault diagnosis for hydraulic servo system, many factors that may affect the fault threshold are analyzed. By integrating the key factors in threshold model, such as modeling error, random disturbance, input instructions, system current status and etc, an adaptive threshold scheme for fault diagnosis is proposed in this paper,...
With the development of the aircraft hydraulic power supply system towards high pressure and large load, Fluid-borne vibration in piping systems leads to serious problems. Because of pump's periodic flow pulsation and fluid-structure interaction, mechanical fatigue can readily take place. Traditionally, passive pulsation dampers have been used to reduce fluid pulsation of high frequencies, but the...
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