• crack identification in a freely vibrating plate using bayesian parameter estimation

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 376
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -

    in this paper a new approach is proposed for identifying the presence and location of a crack in a simply supported plate undergoing free vibration. specifically, the approach uses a markov-chain monte-carlo implementation of bayes’ rule to estimate the crack parameters (i.e., its location, orientation, and size) and their probability distributions. special attention is paid to developing a fast and accurate forward model for the response of the cracked plate. to generate the required time series, a semi-analytical free response is calculated using an fem based eigen-solution. to speed up the simulations, modified elements are used at the crack tips; this permits a more course mesh without sacrificing accuracy. the approach is demonstrated to be effective at identifying all of the crack parameters. furthermore, a natural by-product of this method is that it also provides a confidence (credible) interval for each of these parameters. the results show the utility and accuracy of this method in identifying cracks of various sizes, orientations, and locations.

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