Vertical Vibration Analysis of the Flexible Carbody of High Speed Train

The elastic vibrations in carbody affect the safety of suspension components and the riding comfort of high speed trains. The vertical vibration of a carbody was studied based on a coupled rigid-flexible dynamic model. The vibration characteristics and the transfer relationship under flexible effect were investigated in frequency domain. Analysis results show that the symmetrical and non-symmetric mode responses achieve maximum in specific wavelengths. The resonance speed and resonance wavelength of the first-order vertical bending vibration have significant impact on the operation of the train. When the modal frequencies of the carbody are equal to the natural frequencies, the carbody produces modal resonance. Therefore, high first-order bending frequency improves the safety and the riding comfort.