鉄道車両の上下振動に関する台車支持系の改善手法 : 空気ばね支持系の新たな設計指標(機械力学,計測,自動制御)  [in Japanese] A Methodology on Improving Vertical Oscillation in Railway Vehicles : A New Design Index for Air-Suspension System of Bogie Vehicles(Mechanical Systems)  [in Japanese]

A new design index for the air-supension system of bogie vehicles, which is derived from the existance of the firmness point in the transmissibility of the air-suspension and body mass oscillation system, is described in this article. It is obtained as the point of same frequency response, whenever the damping coeficient by the orifice has any value, and devised as the simple equation by the bellows and reservoir volume ratio. From the point of veiw in the improving the ride comfort, the ratio of the primary and secondary suspension stiffness and the damping ratio for each can be optimized numerically in a evaluating process of the vertical oscillation by using this index. The calculated results in the power spectrum density of car-body vertical accelaration are evalueated in comparison with the real data derived from the high-speed runing test of Shinkansen, and the accuracy and conveniency of this calculation methodolgy are shown in detail. Furthermore, an alterative specification of the vehicle suspention for the reduction of the vertical ride index and the car-body bending oscillation, are described as the successful manner.