The Control Research Of Semi-active Seat Suspension Based On Magnetorheological Damper

With the development of transportation and automobile industry,the requirements for vehicle driving safety are getting more and more important.The introduction of seat suspension can greatly improve the vibration isolation performance of car seats,reduce the driver’s fatigue during long-distance driving,and thus improve driving safety.The magnetorheological damper uses magnetorheological fluid as the working fluid.Because the magnetorheological fluid has the characteristics of changing its molecular arrangement with the change of current,the magnetorheological damper has the advantages of continuously adjustable damping and fast response speed.Therefore,semi-active suspension based on magnetorheological damper has become a research hotspot.This article focuses on the semi-active seat suspension based on the magnetorheological damper,studies the dynamic characteristics of the magnetorheological damper,the control strategy of the semi-active seat suspension and the specific performance of the semi-active seat in the full-vehicle environment.The research content is as follows:First,this article introduces the characteristics of magnetorheological fluid,analyzes the working characteristics of magnetorheological damper,and completes the dynamic performance test of magnetorheological damper.The performance test results fully show the force-speed characteristics under different working current.According to the experimental results,the Bouc-Wen model and the polynomial model of the magnetorheological damper were established,and the parameter identification of the two models was conducted based on genetic algorithm.The relationship between the change of parameters and the working current of magnetorheological damper is summarized.Subsequently,a 2-degree-of-freedom(2DOF)seat suspension model was established,and fuzzy logic control and MPC model predictive control strategies were adopted respectively.Corresponding seat suspension damping controllers were established.Using the above control strategies to build a seat suspension model in Matlab/Simulink for simulation,and applying multiple types of excitation signals,the results are analyzed and compared to verify the feasibility of two types of control algorithms in semi-active seat control.The advantages and disadvantages of the two control algorithms are proposed separately.Finally,a 7-DOF full-vehicle model is established,and the full-vehicle model is integrated with the dynamic model of magnetorheological damper,two-degree-of-freedom seat suspension model,and damping control strategy to verify the performance of the semi-active suspension machine control strategy.In order to fully simulate the application scenarios of semi-active suspension,this paper generates a variety of road file inputs through algorithms in the simulation environment.This paper compares the MPC model predictive control strategy,fuzzy control strategy,and the effect of passive suspension under multiple inputs,summarizes the characteristics of several control strategies and their application potential.The application prospects and the current technical limitations of the seat semi-active suspension are summarized at the end of the paper.