Model updating of flexible vehicle body based on experiment modal parameter

Abstract

Due to the important contribution of flexible modal in rigid-flexible coupled multiple body system (MBS) dynamics, model updating of flex-body generation became a significant and necessary procedure. In this paper, a model updating method based on the measured frequency response function (FRF) is proposed to modify the flexible body in finite element analysis (FEA). To overcome the complexity of multiple measured responses and the huge cost of computation, the Kriging surrogate model with multi-objective function which considers the FRF’s magnitude and shape of curves is proposed. Moreover, the FRF measurement of a high-speed railway carbody is conducted and the measured FRF is transferred into proposed model updating procedure. The results show that the proposed method is performed successfully on a high-speed railway vehicle after model updating and the simulated FRFs tend to coincide with the experimental FRFs. Finally, the updated model is transferred to the rigid-flexible MBS model to validate the influence of the model updating with a comparison of the vibration spectrum and ride comfort index. The results show that the updating procedure will make the prediction of vibration and ride comfort index closer to experimental results.

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