三次元弾性体を有する鉄道車両の マルチボディダイナミクスモデルによる振動特性と走行安定性評価

抄録

This paper describes evaluation of vibration characteristics and running stability of a railway vehicle. In order to improve ride comfort it is necessary to decrease carbody elastic vibration. Transmission excitation force by longitudinal vibration from bogie to carbody induces carbody elastic vibration. For reducing transmission excitation force it is effective to soften longitudinal vibration isolator between carbody and bogie. However, it is commonly considered that running stability becomes worse when longitudinal vibration isolator is softened. Therefore, we should make a device which copes with both elastic vibration reduction and running stability and an advanced model of longitudinal vibration isolator between carbody and bogie. To make a car model including longitudinal vibration isolator, excitation tests of a full-scale test vehicle to verify the vibration isolation performance was carried out in the rolling stock test plant. Then, we made a simulation model of railway vehicle with multi-body dynamics software to confirm the vibration isolation performance on the tests, and to evaluate running stability by obtaining the critical hunting speed. As a result, we confirm that vibration characteristics results at 13.3 Hz on the simulation qualitatively conform to the test, and stiffness of rubber bush through traction link do not greatly contribute to the critical hunting speed.