Abstract
Active suspension is considered to be a good way to improve the ride comfort of high-speed trains. According to the output index requirements of train’s active suspension, a giant magnetostrictive actuator(GMA) is proposed. This is mainly because giant magnetostrictive materials(GMM) has the characteristics of fast response, large output force and high energy conversion rate. It is verified by experiments that the output force is proportional to the excitation current. It is found in the experiment that the excitation frequency should be greater than 120Hz to obtain a stable output force, and it is also found that preload and excitation frequency will affect response time. On the basis of experiments, a 2-DOF physical and mathematical model of the vertical quarter train is built. An MPC algorithm is designed to control GMA active suspension. Through simulation analysis, the proposed control algorithm is compared with passive suspension and active suspension based on PID control algorithm. Both theory and practice show that the proposed control algorithm is effective.
Highlights
Active suspension system is an active control system which can reduce the vibration by using dynamic force
Experiments shown that the output force of the GMA designed by us had a good linear relationship with the excitation current, and the GMA could be applied to the active suspension of the train
We found that the output force fluctuated greatly under the influence of small excitation frequency, and the actuator’s response time was large when the excitation frequency was small
Summary
Active suspension system is an active control system which can reduce the vibration by using dynamic force. The active suspension system consumes a lot of energy when the output force is used for vibration reduction (Liu et al 2021), and the general actuator is difficult to meet the application occasions of the train’s suspension system, which greatly limits the development of active suspension for trains. The combination of GMA and active suspension system to train’s bogie is a new direction of research on active suspension system, which is an effective method to reduce vehicle vibration and improve the safety, stability and comfort of highspeed train’s operation. The research work in this paper can provide reference for the design of new active suspension system, and has important practical significance for the promotion and application of GMA in the field of railway vehicles. It is very important to study the theory and application of GMA applied to the vibration control of train’s active suspension
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