Abstract:To suppress the vibration of flexible carbody of railway vehicle,flexible damper is proposed to be longitudinally installed under carbody underframe.Taking the carbody as a uniform Euler beam supported on secondary suspension,including the structure damping ratio and the flexible damper,a vertical model was built to research the effects of flexible damper on the vehicle ride quality by using the fast ride quality calculation algorithm.The results show flexible damper can help control the flexural vibration of the flexible carbody and the higher the flexible carbody damping coefficient,the lower the first bending frequency of carbody need to be.Researches also show that the nearer the carbody damper installation position is to the center of the carbody,the better effects it will achieve.An example is illustrated in the paper.When the coefficient of flexible damper reaches to 5.0× 109 N·s·m-1,the required lowest bending frequency will drop to 6.5 Hz,which can still achieve good ride quality under 200 km·h-1 operational speed.
