Abstract
In this paper, comparison of results between the self-programming model (considering the track flexibility) and SIMPACK model (considering only fastener support) is carried out. The wheelset vibration is more obviously for the self-programming model as the track flexibility is considered. For the traditional dynamic calculation, the SIMPACK multi-rigid-body model is acceptable. Two kinds of harmonic vibrations in the car body for a metro car, which were found in the service operations, are reproduced by using self-programming model. High tread conicity leds to the harmonic vibrations in the car body about 4.8Hz. Reducing wheel conicity can improve the bogie hunting stability, and solve this problem. Another harmonic vibration with the frequency of about 2.2Hz in the car body is caused by the constant excitation wavelength in the track, which causes vibration transmited through the primary and secondary suspensions to the carbody. To reduce this harmonic vibration, more advanced suspensions are needed.
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