• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (17): 162-174.doi: 10.3901/JME.2023.17.162

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Time-varying Noise Structure Inspired Adaptive Weighted Sparse Model for Aero-engine Bearing Fault Diagnosis

ZHANG Han1,2, TIAN Yi1, DU Zhaohui3   

  1. 1. School of Construction Machinery, Chang'an University, Xi'an 710064;
    2. Key Laboratory of Road Construction Technology and Equipment of Ministry of Education, Chang'an University, Xi'an 710064;
    3. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072
  • Received:2022-09-20 Revised:2023-02-10 Online:2023-09-05 Published:2023-11-16

Abstract: Due to non-stationary operating conditions and time-varying air flows, the background noises embedded into aero-engine vibration signals have time-varying structures or different statistical variances in different temporal parts. Meanwhile, the fault waveforms of aero-engine bearing present an overlapping distortion morphology. Therefore, it is a challenging task to extract the latent and distorted fault patterns for popular fault diagnosis methods. Exploring the time-varying statistical variance structures, an adaptive weighted sparse diagnosis model is proposed. Based on the characteristic period of the fault signal, a segmentation operator is firstly designed to construct two-dimensional matrix with low-rank patterns, and then an singular value decomposition(SVD) Dictionary is established adaptively to obtain the sparse representation of overlapping distortion fault waveforms. Secondly, the time-varying variance structure of background noises is revealed by sufficient statistical analysis, and then a weighted matrix with different column values is designed to describe that time-varying priors. Furthermore, the low-rank patterns of data matrix are incorporated into the weighted matrix through designating different weights to all rows based on the singular values. Based on the sparse representing model and elaborated weighted-matrix, an adaptive weighted sparse diagnosis model(AWSM) is constructed and meanwhile an optimization algorithm is developed for it. Simulation analysis shows that the proposed algorithm can effectively filter out the time-varying noise of aero-engine bearings, and reliably extract the weak fault features of bearings. Finally, experiments indicate that the proposed algorithm can perform the fault diagnosis of aero-engine bearing with spalling area of 1.0 mm2 at speed up to 25 000 r/min.

Key words: aero-engine bearing, fault diagnosis, time-varying gaussian noise, sparse representation, adaptive weighted matrix

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