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Abstract
Car body and trucks of lightweight high-speed train tend to vibrate in elastic modes at frequencies higher than about 5 Hz, and sometimes their flexural vibration leads to the deterioration of the riding comfort. This paper presents a theoretical analysis on the vibration of a truck frame and a car body with flexural rigidity. The vibrations induced by vertical track irregularities are analysed using the transfer matrix method. Numerical results are compared with results of measurements made on the Shinkansen train. The results show that this method well simulates the vibration of a truck frame at high frequencies over 5 Hz compared with the classical method that disregards the flexural rigidity of the truck frame. Effects of the truck frame rigidity, the loss factor and the wheelbase on the vibration characteristics of truck frame are studied in detail, which leads to a conclusion that the rigidity of truck frame should be considered in the vibration analysis of truck at excitation frequencies higher than 10 Hz.
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