Finite Element Analysis has been used extensively in the past for modelling the system response of coupled vibro-acoustic systems, and recently has been used for predicting the performance of active noise control systems in cavities enclosed by contiguous structures. The analysis of such fully-coupled models requires considerable computational resources; however, CPU time may be significantly reduced if the systems are modelled separately and then combined using modal coupling theory. The success of this approach requires accurate numerical models which must be validated experimentally and which often involve significant investment of time and effort. Measured transfer fuctions may also be used to estimate control system performance. Although this technique provides acurate system data, it requires that each point of interest be excited by a source (even if reciprocity is assumed) in order to identify each transfer function which again can involve significant effort. In this paper, it is shown that use of modal analysis of measured data in conjunction with modal superposition and modal coupling provides an alternative analysis approach which is more efficient than using measured FRF and is potentially as accurate as FEA. In the remainder of the paper, the latter approach is described and results obtained using this technique are compared with experimental results and those using the FEA approach.


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    Title :

    Modelling the structural/acoustic coupling of an aircraft fuselage for optimising an active noise control system


    Contributors:


    Publication date :

    1996


    Size :

    4 Seiten, 6 Bilder, 5 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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