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  • Multipoint Optimal Minimum ...
    McDonald, Geoff L.; Zhao, Qing

    Mechanical systems and signal processing, 01/2017, Letnik: 82
    Journal Article

    Minimum Entropy Deconvolution (MED) has been applied successfully to rotating machine fault detection from vibration data, however this method has limitations. A convolution adjustment to the MED definition and solution is proposed in this paper to address the discontinuity at the start of the signal – in some cases causing spurious impulses to be erroneously deconvolved. A problem with the MED solution is that it is an iterative selection process, and will not necessarily design an optimal filter for the posed problem. Additionally, the problem goal in MED prefers to deconvolve a single-impulse, while in rotating machine faults we expect one impulse-like vibration source per rotational period of the faulty element. Maximum Correlated Kurtosis Deconvolution was proposed to address some of these problems, and although it solves the target goal of multiple periodic impulses, it is still an iterative non-optimal solution to the posed problem and only solves for a limited set of impulses in a row. Ideally, the problem goal should target an impulse train as the output goal, and should directly solve for the optimal filter in a non-iterative manner. To meet these goals, we propose a non-iterative deconvolution approach called Multipoint Optimal Minimum Entropy Deconvolution Adjusted (MOMEDA). MOMEDA proposes a deconvolution problem with an infinite impulse train as the goal and the optimal filter solution can be solved for directly. From experimental data on a gearbox with and without a gear tooth chip, we show that MOMEDA and its deconvolution spectrums according to the period between the impulses can be used to detect faults and study the health of rotating machine elements effectively. •Vibration from rotating machines with impulse-like fault sources are studied.•MED convolution fix is proposed to remove discontinuity-related spurious impulses.•MOMEDA is proposed as a non-iterative deconvolution problem to deconvolve impulses controlled by a target vector.•Spectrums of impulse train targets can be solved simultaneously to study the fault level according to the fault period.•On our setup, results show that AR model preprocessing before deconvolutions had no significant effect on fault detection result.