Abstract
In the magnetorheological (MR) impact buffer system, the internal or external disturbance of the MR damper is one of the main factors that affect the buffer performance of the system. This study aims to suppress or eliminate the influence of the disturbance of the MR damper. The continuous terminal sliding mode control (CTSMC) strategy with a high gain has a strong antidisturbance ability. However, the high gain may cause fluctuation of the damping force of the system. Therefore, a composite control strategy of sliding mode active disturbance rejection control (ADRC) based on an extended state observer (ESO) is proposed in this study. The total disturbance of the system is estimated by the ESO in real time, and the estimated disturbance is used as a feedforward compensation to the controller to reduce the influence of disturbance on the system. The gain of the CTSMC law of the closed-loop system can be reduced. In addition, the Lyapunov stability criterion is used to ensure the stability of the proposed controller. In order to verify the performance of the proposed CTSMC controller on response speed, overshoot, and hysteresis suppression ability, the window function, square wave function, and multistep function are given as the inputs of the control system. To verify the performance of the proposed sliding mode ADRC for the MR impact buffer system, the mechanical model and the control model are established and simulated using MATLAB/Simulink. The simulation results show that the CTSMC controller has the fastest response time and no overshoot and can suppress the hysteresis nonlinearity of the MR device compared with the open-loop control, PID control, and fractional order PID control. The MR impact buffer system with the sliding mode ADRC obtained the minimum peak value of 4350N within the permitted buffer displacement range compared with the other three traditional control methods. That means the proposed control method in this study has the advantage on buffer performance for the MR impact buffer system.
Highlights
With magnetorheological (MR) fluid as the working medium, MR dampers, a kind of semiactive control device with a new structure, have a simple mechanical structure, fast response speed at the millisecond level, low power consumption, damping force that can be continuously adjusted forward and backward in a wide range, etc
Under the circumstance of hysteresis disturbance and temperature (20–50°C) disturbance, the simulation results of the MR impact buffer system under the controller of open loop, PID, fractional PID, continuous terminal sliding mode control (CTSMC), and the sliding mode active disturbance rejection control (ADRC) are shown in Figure 17 and Table 1
In order to suppress the influence of disturbance on the MR impact buffer system, the temperature disturbance and hysteresis disturbance of the system are analyzed
Summary
With magnetorheological (MR) fluid as the working medium, MR dampers, a kind of semiactive control device with a new structure, have a simple mechanical structure, fast response speed at the millisecond level, low power consumption, damping force that can be continuously adjusted forward and backward in a wide range, etc These excellent characteristics make them have broad application prospects in the fields of impact resistance and high-speed vibration reduction and have been initially applied in the fields of aerospace, vehicles, buildings, bridges, and civil engineering (Carlson, 2002; Liu et al, 2005; Wereley et al, 2011; Hughes et al, 2017; Guo et al, 2019; Tudon-Martinez et al, 2019; Du et al, 2020; Yoon et al, 2020). The large amount of effort put into this field has led to a good understanding of the control method of MR dampers under high-speed vibration damping
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