Adaptive separation method for impact features based on multiscale morphological filtering and recursive subtraction
HE Dan1,2,QUAN Wei1,TANG Mingjun3,LIU Hui1
1.College of Mechanical Engineering,Xi’an Polytechnic University,Xi’an 710048,China; 2.Xi’an Municipal Key Lab of Modern Intelligent Textile Equipment,Xi’an 710600,China; 3.School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China
Abstract:Aiming at the difficult problem that the coupled impact feature extraction and separation in fault diagnosis, a method of adaptive extraction and separation of impact features based on multiscale morphological filtering (MMF) and recursive differencing was proposed. Firstly, the CMFH morphological operator suitable for impact feature separation is selected from the typical combinatorial operators using EA index and frequency response characteristic analysis; Secondly, the periodic impact features are extracted using the CMFH morphological operator and the weighted harmonic-to-noise ratio (WHNR) index; Then, the SOSO technique is used to suppress harmonic interference and white noise to further enhance the periodic impact features; Finally, the cyclic filter is constructed by iterative difference idea to extract and separate the periodic impact features at multiple scales. The simulation data and the analysis results of the traction motor bearing fault data show that the proposed method is better than the latest blind deconvolution (CYCBD) method and the classical spectral kurtosis method in extracting periodic impact under random impacts and harmonic disturbances.
和丹1,2,权伟1,汤明军3,刘晖1. 基于多尺度形态滤波和递归求差的冲击特征自适应分离方法[J]. 振动与冲击, 2024, 43(5): 149-158.
HE Dan1,2,QUAN Wei1,TANG Mingjun3,LIU Hui1. Adaptive separation method for impact features based on multiscale morphological filtering and recursive subtraction. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(5): 149-158.
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