Research on Current Drive System of Magnetorheological Damper Based on Fuzzy PI Control

Abstract

Magnetorheological dampers (MRD) are increasingly used in smart structural damping systems due to their good damping properties. In practical applications, as a nonlinear device, the parameters of the internal excitation coil of the magnetorheological damper will change during operation under the influence of the temperature and external environment, deteriorating the dynamic performance of the output current of the driver and reducing the damping effect of the system. Therefore, the current driver needs to be optimized for this phenomenon in order to ensure accurate current output. In this paper, a mathematical model of the buck circuit combined with the MRD equivalent circuit is established, and after analyzing the model, the parameters of the PI controller are rectified to lay the foundation for the design of the adaptive law. Then, with the help of the fuzzy control method, a fuzzy PI control strategy for MRD current driver is established, which enables the current driving system to adjust the control parameters adaptively when the MRD parameters change and ensure the accurate driving current output. The experimental results demonstrate that the fuzzy PI control strategy has a stronger robustness in the face of parameter changes of the control object compared with the traditional PI control at a system parameter change rate of 40%.

Quasi-Static Modelling of a Full-Channel Effective Magnetorheological Damper with Trapezoidal Magnetic Rings

“…The material of A2 is No.45 steel, whose maximum magnetic induction intensity B 2max is 1.5 T. B f is 0.304 T according to the structural size of the FEMRD_TMR in Table 1 and calculated by Equation (27). According to Figure 8, the simulation result of the average magnetic induction intensity of the FEMRD_TMR damping channel is 0.312 T. It can be seen that the magnetic induction intensity obtained by the theoretical calculation method of the magnetic circuit has a minor error with the simulation result; the magnetic circuit calculation method has a high calculation accuracy.…”

“…An accurate damping characteristics model is essential when MRD is applied to vehicle suspension systems [27]. The quasi-static model is based on the theory of fluid mechanics, has a rigorous mathematical derivation process, and the model parameters have definite physical significance, usually used in the structural design process of MRD.…”