For some faults of refusing action,sticking and jamming under valves operation for a liquid oxygen/liquid hydrogen rocket engine,the condition monitoring technique of valve switching action based on vibration characteristic analysis was investigated. Dual self-optimizing wavelet technology was used to denoise the vibration signals of valves. Short-time Fourier transform method was then adopted to conduct the time-frequency analysis of the denoised signals. The relative instantaneous energy extracted from th...
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