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Abstract
A carbody of a highspeed train sometimes vibrates with a bending mode of less than 10Hz, which leads to poor riding quality. This paper describes a method for analyzing the vibration of a truck frame and a carbody taking account of their flexural rigidity. The vertical vibration of a carbody induced by vertical track irregularities is analyzed using the transfer matrix method. The numerical results are compared with the measurements on a Shinkansen train. The results show that this method well simulates the vibration of a carbody at higher frequencies above 10Hz compared with the classical method that disregards the flexural rigidity of the truck frame. Effects of the truck frame rigidity, wheelbase and axle spring characteristics on riding comfort are studied in detail. It is found that the effects of truck frame rigidity on riding quality are not significant but that the vibration characteristics at higher frequencies above 10Hz are affected significantly by the truck frame rigidity.
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