Weak fault diagnosis based on adaptive Wiener denoising and optimized matching pursuit algorithm
In order to accurately diagnose the early weak fault of rotating machinery,based on the analysis of signal characteristics,adaptive Wiener filtering was used to remove the random impact interference in the signal,and a method for extracting weak fault characteristics based on optimized matching pursuit algorithm was proposed.Firstly,the characteristics of early weak fault signals in rotating machinery were analyzed,a window length adaptive strategy was introduced in short-term Wiener filtering to achieve the removal of random impact interference,and the removal of random impact interference of early weak fault signal was realized,therefore the useful component in the fault signal was retained.Secondly,by analyzing the shortcomings of the iterative threshold in the reconstruction accuracy of the current matching pursuit algorithm,a robust termination condition based on adjacent residuals of matching pursuit algorithm was designed,and the reconstruction accuracy and quality of fault signal were effectively improved by the proposing method.Finally,the optimized matching pursuit algorithm was applied to extract the fault feature,and strong characteristic signal extraction from weak signal was realized.The simulation and experimental results show that the adaptive Wiener filter can effectively remove random interference while preserving the periodic fault signals.The characteristic frequencies 160 Hz and their harmonics in the signal envelope spectrum reconstructed by the optimized matching pursuit algorithm is significantly highlighted.In other frequency bands,the signal energy is almost zero,it means the method can accurately determine the type of fault.The results show that comparing with the traditional Wiener denoising and matching pursuit algorithm,the adaptive Wiener denoising and optimized matching pursuit algorithms have feasibility and superiority in weak fault extraction.
rotary machineadaptive Wiener denoisingmatching pursuit algorithmweak signal fault diagnosisrobust termination conditionsignal envelope
万方数据
维普
