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In recent years, railway vehicle are becoming lighter because this corresponds not only to the improvement of the running speed but also to the reduction of running cost and environmental noise, especially for ultra-high-speed vehicle such as new Shinkansen and MAGLEV vehicle. However, this causes the deterioration of riding comfort. Bending vibration control method using piezoelectric actuators were proposed and good control performances were obtained through simulations and experiments. In this paper, active vibration control by combined use of piezoelectric actuators and linear actuators is investigated. Elastic vibrations are suppressed by piezoelectric actuators and rigid-body vibrations are reduced by linear actuators. Simulation studies and experiments using scale model were conducted and the effectiveness of the proposed control was confirmed. [ABSTRACT FROM AUTHOR]

In recent years, railway vehicles have become lighter, corresponding to improvement in the running speed. However, this causes the deterioration of the body rigidity, and leads to the increase in a vertical bending vibration of the body, because the natural frequency of the first bending vibration overlaps with a human's uncomfortable and sensitive frequency band. Many vibration suppression strategies have been proposed, i.e. a method to conduct active control for the secondary suspension system between the body and bogie, and a method to attach visco-elastic layers and constraint layers on the outside sheeting of the car body. In this paper, new control methods by shunt damping using stack type piezoelectric devices are proposed and the effectiveness and the robustness of designed circuits were confirmed through 1/6 scale model experiments. [ABSTRACT FROM AUTHOR]