Keywords: structure borne noise, bogie frame, transfer path, vibration transmission, elastic multi-body simulation, MBS, model order reduction, MOR, Morpack.

This paper deals with the modeling of the structure borne (SB) sound transmission in the bogie frame using multi-body simulation (MBS). In this context the study, presented in this paper, provides an overview of current practices in elastic MBS. As a practical example, a detailed finite element (FE) model of a current bogie frame has been built up and numerically validated for a frequency range up to 1000 Hz. This model was reduced with two different model order reduction (MOR) methods, the conventional component mode synthesis and the rational Krylov subspace method. The reduction was performed using the specialized software package Morpack. The reduced models are compared both in the unconstrained as well as in the installed state of a rail vehicle. To obtain transfer functions (admittances were considered), these MBS models are linearized and the calculation is performed in the frequency domain using the state space description. The investigations show that the behavior of the two reduced models are comparable. Finally, the difference in the transfer functions between the unconstrained (free) model and the installed state are focused on. The comparison shows, that the global trend is maintained while the global evaluated mean deviation, considering all 30276 transfer paths, is 13.2 to 13.5 dB.

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