Abstract
Recent light-weighted railway vehicle carbodies tend to have complicated three dimensional vertical elastic vibrations and such vibrations affect riding quality. In particular, the modes similar to the first bending mode of free supported elastic beam ("B mode") and diagonal distortion mode ("D mode") are important because natural frequencies of the two modes are around lOHz which is known to be a sensitive frequency range for human. A method to reduce the two elastic vibrations simultaneously with two active mass dampers (AMDs) was proposed in our previous researches and the validity was confirmed. As a next step, we are trying to develop a more practical AMD system with smaller and lighter actuators and more effective control law. In order to study the specification of actuator, such as maximum force and maximum stroke, a number of numerical simulations in time domain have to be carried out, therefore, we need a compact numerical model of a railway vehicle including AMDs. In this paper, examined a method to obtain reduced model with small DOF by using modal analysis is proposed, and the accuracy of the modal is examined by comparing with measurement results. By using the reduced model, the suitable specifications for the practical AMDs are studied numerically.
