We present a feasibility analysis for the development of an online ball bearing fault detection and identification system. This system can effectively identify various fault stages related to the evolution of friction within the contact in the coated ball bearings. Data are collected from laboratory experiments involving forces, torque and acceleration sensors. To detect the ball bearing faulty stages, we have developed a new bispectrum and entropy analysis methods to capture the faulty transient signals embedded in the measurements. Test results have shown that these methods can detect the small abnormal transient signals associated with the friction evolution. To identify the fault stages, we have further developed a set of stochastic models using hidden Markov model (HMM). Instead of using the discrete sequences, our HMM models can incorporate the feature vectors modeled as Gaussian mixtures. To facilitate online fault identification, we build an HMM model for each fault stage. At each evaluation time, all HMM models are evaluated and the final detection is refined based on individual detections. Test results using laboratory experiment data have shown that our system can identify coated ball bearing faults in near real-time.


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    Title :

    Online tribology ball bearing fault detection and identification


    Contributors:
    Ling, B. (author) / Khonsari, M. M. (author)

    Conference:

    Sensors and Systems for Space Applications ; 2007 ; Orlando,Florida,United States


    Published in:

    Publication date :

    2007-04-26





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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