Immittance identification: An application to the dynamic modelling of vehicle components Online publication date: Sun, 25-May-2014
by N.G. Hemingway
International Journal of Vehicle Design (IJVD), Vol. 6, No. 1, 1985
Abstract: If the dynamic characteristics of a number of components or sub-systems can be defined then it is possible to predict the vibration characteristics of an assembly comprising these sub-systems. One method of defining the dynamic characteristics of the sub-system is to specify its immittance matrix. It is therefore desirable to obtain a mathematical model of a component that is capable of generating this immittance matrix. Such a model can be obtained from experimental data produced from a vibration test on the component and the process of extracting the model from this data is termed immittance identification. This paper shows how such a modelling was performed, on components comprising a vehicle suspension, from mobility test data obtained using relatively simple experimental instrumentation, together with an analytical method that reduced the computation necessary when determining the modal parameters of the model.
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