Journal of Mechanical Science and Technology

, Volume 31, Issue 4, pp 1587–1601 | Cite as

Low-speed rolling bearing fault diagnosis based on EMD denoising and parameter estimate with alpha stable distribution

  • Qing Xiong
  • Yanhai Xu
  • Yiqiang Peng
  • Weihua Zhang
  • Yongjian Li
  • Lan Tang
Article

Abstract

When low-speed rolling bearings fail, it is hard to diagnose the extent of their damage. We developed a test rig to simulate the lowspeed rolling bearing operating condition, where bearings with various fault states are installed on the test wheelset and subjected to the same external loading condition. The collected bearing box acceleration time histories are processed with the Empirical mode decomposition (EMD) method combined with kurtosis criterion to filter the trend and noise components. Five characteristic parameters of Alpha stable distribution (ASD) are identified by fitting the ASD distribution to the vibration acceleration signals and computing the Probability density function (PDF). To highlight the advantage of ASD method in feature extraction, kurtosis also has be calculated. Through sensitivity and stability analysis of the six parameters and utilization of Least squares support vectors machine (LSSVM) with Particle swarm optimization (PSO), three most sensitive and stable feature parameters including the characteristic exponent α, the scale factor γ and the peak value of the PDF h are located and applied to evaluate the low-speed rolling bearings’ damage position and damage extent. The proposed method was validated by test data, and the results demonstrated that the ASD characteristics combined with PSO-LSSVM can not only achieve fault diagnosis of low-speed rolling bearings' damage position and damage extent, but also have better diagnosis accuracy and operational efficiency than other methods.

Keywords

Low-speed rolling bearing Fault diagnosis Empirical mode decomposition Alpha stable distribution Particle swarm optimization algorithm Least squares support vector machine 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Qing Xiong
    • 1
    • 2
  • Yanhai Xu
    • 2
  • Yiqiang Peng
    • 2
  • Weihua Zhang
    • 3
  • Yongjian Li
    • 3
  • Lan Tang
    • 2
  1. 1.Key Laboratory of Fluid and Power Machinery, Ministry of EducationXihua UniversityChengdu, SichuanChina
  2. 2.School of Automobile & TransportationXihua UniversityChengdu, SichuanChina
  3. 3.State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu, SichuanChina

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