Abstract
Making carbody and trucks lightweight for high-speed railway vehicle has recently progressed in competition with the other transportation. However, it is known that the lightweight tends to reduce the bending stiffness of body and to cause the fundamental vertical bending vibration which brings about the deterioration of the riding comfort. This paper aims to analyze the elastic vibration of the lightweight high-speed railway vehicle, and to propose a method of designing the vibration control system to reduce its vibration mode. First, the finite element method (FEM) model of lightweight vehicle is designed, which is composed by carbody and trucks, and three-dimensional characteristics of vehicle are examined by performing natural frequency analysis. In this study, the mechanism of trucks is taken into consideration in the analysis and is utilized for the design of controller. Next, the control system is designed on the basis of the analytical result. An active vibration absorber installed under the body floor is used for the device of vibration reduction. The controller with high robustness is designed by applying the H∞/fEcontrol method considering parameter variations and model errors in uncontrolled modes simultaneously. As a result of numerical calculations the usefuness of the proposed method was verified.
