Abstract: Model Frequencies of carbody structure are the important parameters in the design
of rail vehicles. In order to assure the first warp model frequency that is above 10Hz during the
design phase, the formulas is derived, and FEA proceed. Then the results are compared with each
other and the reasons for the difference between them are concluded. The calculation is useful for
the design of carbody structure.

Key words: carbody structure, model frequency, analysis calculation, numerical calculation;
model analysis