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• W1676999937 abstract "Classically, the modal parameters of a car are derived from FRF measurements in well-controlled laboratory conditions using hammer of shaker excitation. However, the modal vibro-acoustic behavior of a car on the road may differ significantly from the one during the laboratory test due to e.g. pre-stress and non-linear behavior of the suspension system. Hence, the need arises to identify a modal model of a car in driving condition. In this case, only response data are measurable while the actual loading condition is unknown. In the last decade, the problem of output-only operational modal analysis has typically been approached by applying a peak-picking technique to the auto-and crosspowers of the responses, resulting in approximate estimates for the resonance frequency and operational deflection shapes. These shapes were then compared to or even decomposed into the laboratory modal results. In this paper, it is investigated how more advanced techniques such as the Polyreference LSCE fed by correlation functions and the stochastic subspace method can be used for the extraction of the modes of a car on the road. The basic principles of the two methods are briefly reviewed and practical advantages and drawbacks are discussed. Subsequently, the two methods are applied to structural response data of the rear suspension system of a family car. The obtained modal parameters are correlated with the values derived from the laboratory FRF data, allowing to assess the modes which are dominant in driving condition." @default.
• W1676999937 created "2016-06-24" @default.
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• W1676999937 date "1998-02-01" @default.
• W1676999937 modified "2023-09-24" @default.
• W1676999937 title "Modal testing and analysis of a car under operational conditions" @default.
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