Identification of multi-degree of freedom non-linear systems using an extension of force appropriation

Michael F. Platten, Jan R. Wright, Jonathan E. Cooper, Mehdi Sarmast

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


    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 non-linearly or exhibiting damping coupling, is presented. The approach is illustrated on non-linear 5 and 9 degree-of-freedom simulated systems. 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. The effectiveness of the reduced model in representing the non-linear characteristics of the system is considered. The potential of the approach for the identification of high order non-linear systems is discussed.
    Original languageEnglish
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering|Proc SPIE Int Soc Opt Eng
    Number of pages6
    Publication statusPublished - 2002
    EventProceedings of IMAC-XX: A Conference on Structural Dynamics - Los Angeles, CA
    Duration: 1 Jul 2002 → …


    ConferenceProceedings of IMAC-XX: A Conference on Structural Dynamics
    CityLos Angeles, CA
    Period1/07/02 → …


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