Identification of multi-degree of freedom non-linear simulated and experimental systems

M. F. Platten, J. R. Wright, J. E. Cooper, M. Sarmast

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    In this paper, the potential classification of a real dynamic system (e.g. aircraft) with a large number of modes into a number of different categories of modes (i.e. linear / non-linear, coupled / uncoupled in damping and/or non-linearity) that may be identified individually, or in small groups, is presented. The use of a multi-exciter identification approach using a mixture of classical curve fitting for modes that behave linearly with proportional damping, and appropriated excitation applied in bursts for modes behaving nonlinearly or exhibiting damping coupling, is presented. The approach is illustrated on a non-linear 9 degree-of-freedom simulated system and experimentally on a non-linear single-bay panel structure. This burst approach, based on an extension of the Resonant Decay Method, is essentially a derivative of the Restoring Force Surface method and involves a regression analysis based in modal space.
    Original languageEnglish
    Title of host publicationProceedings of the 2002 International Conference on Noise and Vibration Engineering, ISMA|Proc. Int. Conf. Noise Vib. Eng. ISMA
    EditorsP. Sas, B. Hal
    Pages1195-1202
    Number of pages7
    Publication statusPublished - 2002
    EventProceedings of the 2002 International Conference on Noise and Vibration Engineering, ISMA - Leuven
    Duration: 1 Jul 2002 → …

    Conference

    ConferenceProceedings of the 2002 International Conference on Noise and Vibration Engineering, ISMA
    CityLeuven
    Period1/07/02 → …

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