1D31 The performance improvement of active lateral secondary suspension control system for conventional line vehicles by controller switching between straight and curve(Vehicles-Dynamics)

抄録

Previously, lateral vibration suppressions of railway vehicles were realized by passive secondary suspensions. However, its effects were limited; therefore, an active lateral secondary suspension control system (ALS) was developed to improve passenger comfort. ALS has two actuators and two acceleration sensors to control yawing, lateral, and rolling vibrations of a car body. Considering linear equations of motion above bogie trucks, the vibrations can be separated into two modes. One is the lateral/roll coupled mode; the other is yaw mode. Controllers for each mode are designed by H-infinity control theory. We focus on the following problem: the control performance of ALS for conventional trains that decreases in curve sections as compared with straight sections. First, we investigate a reason of the cause by simulation. We found that due to a centrifugal acceleration included in lateral/roll acceleration and lateral/roll controller's gain, saturation of the command value to actuators are caused in curve sections, and thus, the control performance deceases. Next, we analyzed two methods to find a solution for this problem. One is FFT analysis for the centrifugal acceleration because most centrifugal accelerations have a low frequency component that doesn't have a strong correlation with passenger comfort. The other method is a simulation analysis of control performance in straight section. Accordingly, a comparison between a lateral/roll controller and a yaw controller reveals that contribution to improving passenger comfort is more for the yaw controller. Considering these problems and their solutions, we developed a new control method that has each lateral/roll controllers for straight and curve sections. Next, performance of the proposed method is verified by simulation. Consequently, we found that in comparison with the conventional method, the proposed method enhances the ride quality level by a maximum of 2dB, which can vary according to improvement in the performance of the yaw control by reducing the saturation of command value.