Abstract
Active suspensions have been studied to improve the ride quality of railway vehicles. In many cases, pneumatic actuators were employed in those studies. This paper deals with the application of oil-hydraulic actuators, which are expected to have stronger control effect on the running vibration. This is examined experimentally by using an actual-size vehicle model on a test stand. The LQG control law, in which state variables are estimated from measurable accelerations on actual railway vehicles, is adopted. The LQ control law, in which state variables are measured accelerations and their integrated quantities, is also adopted. The results show that both controllers have good vibration isolation performance in both harmonic and random excitations. The control force and the stability are improved by decreasing the lateral damping in parallel with the actuator in the secondary suspension. In this case, it is confirmed that the relative displacement between the car body and bogie does not increase.
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