A new fault diagnosis approach for bearing based on multi-scale entropy of the optimized VMD

HUANG Da-rong1 KE Lan-yan1 LIN Meng-ting1 SUN Guo-xi2

(1.College of Information Science and Engineering, Chongqing Jiaotong University, Chongqing, China 400074)
(2.Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis, Guangdong University of Petrochemical Technology, Maoming, Guangdong Province, China 525000)

【Abstract】It is well known that the parameter K of variational mode decomposition (VMD) needs to be preset according to prior knowledge without theoretical support for optimal setting. Thus, for the existing fault diagnosis methods of bearings based on VMD, the correctness of characteristic extraction and accuracy of fault diagnosis are extremely difficult to be guaranteed. A novel collaborative diagnosis approach of petrochemical equipment for bearing based on optimal VMD and multiscale entropy (MSE) is proposed to solve this problem. Firstly, because of the difficulty in optimizing the decomposition parameter K of VMD, an effective estimation model of K is constructed according to the frequency distribution characteristics of the decomposition components of local mean decomposition (LMD). Then, a novel characteristic extraction technique combining MSE with linear discriminant analysis (LDA) is proposed to establish characteristic samples. Furthermore, aimed at the fault features of small samples for bearing, support vector machine (SVM) is introduced to identify the fault characteristics. Finally, the bearing fault data collected from the simulation platform of the petrochemical equipment laboratory is used to verify the effectiveness and engineering practicability of the proposed approach. The comparative analyses show that the proposed algorithm can effectively diagnose the faults of the bearing with good engineering operability and scalability.

【Keywords】 bearing faults; VMD algorithm; MSE algorithm; LDA algorithm; SVM fault characteristics recognition;

【DOI】

【Funds】 National Natural Science Foundation of China (61663008, 61573076, 61473094, 61304104, 61004118) Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (2015-49) Support Program for Outstanding Talents of Higher Education of Chongqing, China (2014-18) Open Fund Project of the Key Laboratory of Petrochemical Equipment Fault Diagnosis of Guangdong Province, China (GDUPKLAB201501/GDUPKLAB201604) Characteristic Innovation Projects of Universities in Guangdong Province, China (201463104) Science and Technology Research Project of Chongqing Municipal Education Commission, China (KJ1705139/KJZD-K201800701)

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This Article

ISSN:1001-0920

CN: 21-1124/TP

Vol 35, No. 07, Pages 1631-1638

July 2020

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Article Outline

Abstract

  • 0 Introduction
  • 1 Adaptive decomposition model of fault signal of bearing
  • 2 Extraction model of fault features based on MSE and LDA
  • 3 Recognition of fault features of bearing based on SVM
  • 4 Experimental verification
  • 5 Conclusions
  • References