Keywords: high-speed EMU, car body vibration, modal vibration decomposition, singular value decomposition, least squares fitting.

In order to grasp the modal vibration characteristics of the elastic car body of the high-speed EMU, the rigid–flexible coupled dynamic model of the high-speed EMU vehicle including an elastic car body is established, and according to the modal superposition theory, a modal vibration decomposition method based on singular value decomposition (SVD) and least squares fitting is proposed, and the physical vibration response of the car body is decoupled into the modal vibrations of the car body. The results show that the rigid–flexible coupled dynamic model of the vehicle established can effectively reflect the modal information of the car body, and the proposed modal vibration decomposition method can decouple the physical response into modal vibrations of various orders, moreover, the contribution of each order modal vibration of the car body to the physical vibration of the concerned position on the car body can be accurately analysed. The modal vibration decomposition method proposed can provide a basis for the vibration control of the car body and the improvement of the running quality of the vehicle.

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