Theoretical Analysis for Flexural Vibration Damping Method of Rolling Stock Carbody.

A new method for enhancing riding comfort by reducing vertical flexural vibration of a carbody is studied in this paper. In order to dissipate the energy of flexural vibration while minimizing the weight to be added, viscoelastic layers and constraint layers are stuck partially onto the outside sheathing of the carbody. Riding comfort, including the flexural vibration of the carbody excited by vertical track irregularities, is analyzed theoretically assuming that the carbody is a partially multilayered beam. As a result of the analysis it is revealed that there exists an optimum length of the damping layers which leads to the maximum damping. It is found that damping of the vibration can be maximized by choosing appropriate characteristics of the damping layers. It is concluded that this method can contribute to better riding comfort of a lightweight carbody of a high-speed train.