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Sensors 2017, 17(6), 1307; doi:10.3390/s17061307

Diagnosis of Compound Fault Using Sparsity Promoted-Based Sparse Component Analysis

1
College of Mechanical & Electrical Engineering, Beijing University of Chemical Technology, Chao Yang District, Beijing 100029, China
2
Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 11 April 2017 / Revised: 16 May 2017 / Accepted: 24 May 2017 / Published: 6 June 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3860 KB, uploaded 7 June 2017]   |  

Abstract

Compound faults often occur in rotating machinery, which increases the difficulty of fault diagnosis. In this case, blind source separation, which usually includes independent component analysis (ICA) and sparse component analysis (SCA), was proposed to separate mixed signals. SCA, which is based on the sparsity of target signals, was developed to sever the compound faults and effectively diagnose the fault due to its advantage over ICA in underdetermined conditions. However, there is an issue regarding the vibration signals, which are inadequately sparse, and it is difficult to represent them in a sparse way. Accordingly, to overcome the above-mentioned problem, a sparsity-promoted approach named wavelet modulus maxima is applied to obtain the sparse observation signal. Then, the potential function is utilized to estimate the number of source signals and the mixed matrix based on the sparse signal. Finally, the separation of the source signals can be achieved according to the shortest path method. To validate the effectiveness of the proposed method, the simulated signals and vibration signals measured from faulty roller bearings are used. The faults that occur in a roller bearing are the outer-race flaw, the inner-race flaw and the rolling element flaw. The results show that the fault features acquired using the proposed approach are evidently close to the theoretical values. For instance, the inner-race feature frequency 101.3 Hz is very similar to the theoretical calculation 101 Hz. Therefore, it is effective to achieve the separation of compound faults utilizing the suggest method, even in underdetermined cases. In addition, a comparison is applied to prove that the proposed method outperforms the traditional SCA method when the vibration signals are inadequate. View Full-Text
Keywords: rotating machinery; compound fault diagnosis; wavelet modulus maxima; sparse component analysis rotating machinery; compound fault diagnosis; wavelet modulus maxima; sparse component analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hao, Y.; Song, L.; Ke, Y.; Wang, H.; Chen, P. Diagnosis of Compound Fault Using Sparsity Promoted-Based Sparse Component Analysis. Sensors 2017, 17, 1307.

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