• Journal of the Korean Society for Railway
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• v.11 no.1
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• pp.39-44
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• 2008

A two degree-of-freedom model for the bogie and car body of an EMU(Electrical Multiple Unit) was implemented on the basis of the experimental data which was actually measured during the running test of an EMU. The air spring of the EMU was modeled using Nishimura's air spring model to accommodate viscoelastic characteristics. Numerical simulation for the variation of th e design parameters of the suspension system shows that reduction of the stiffness of the air spring by decreasing the internal pressure of the air tank or increasing the size of the auxiliary tank can reduce the bounce of the car body within the stability range of the suspension system.