MR Damper Semi-active Suspension Control

With the rapid development of the automotive industry technology,the driving speed of automobiles has also been continuously improved.Compared with other types of suspension systems,the research value of semi-active suspension systems based on magnetorheological shock absorbers is very high,and their application prospects are broad.The research on the system generally involves the structural design of the suspension,the design and selection of the shock absorber,the modeling method of the system,the choice of control strategy,the simulation of the control system,the semi-physical test and the physical test.The main purpose of this paper is to study the control strategy of semi-active suspension based on magnetorheological damper to improve the performance of semi-active suspension.Magneto-rheological damper(MRD)is a semi-active suspension actuator.Understanding and understanding of the working principle and mechanical characteristics of MR dampers is the basis for in-depth research on MRD control issues.Due to the complex structure of the MRD,the mechanical properties of the MRD are complex and diverse.When establishing the MR damper model,first obtain experimental data of MRD external characteristics test,then analyze the relationship between model parameters and current changes,and fit the identified values to the data to finally determine the MR damper.Model.And the accuracy of the identification results of the experimental data hysteresis model is used.When designing the MRD controller,and adopts the control strategy of feed-forward and feedback to design controller to achieve the purpose of accurate control of MRD.Understand the physical characteristics of semi-active suspension and establish a kinematic model of a 1/4 car semi-active suspension for the research of semi-active suspension control methods.By analyzing the inherent characteristics of the semi-active suspension,the suspension indexes and evaluation methods are determined,and the mathematical model of the road surface roughness and therandom road surface theory are analyzed.Based on this,a white noise-based road time-domain model and Convex hull traffic model.Based on MATLAB / simulink simulation software,a 1 / 4-vehicle semi-active suspension model and different road condition models are established,which provides a good model platform for the next simulation environment experimental research.Considering road excitation interference,MRD output saturation,and tire grounding,this paper proposes a semi-active suspension control method based on constrained H? output feedback.First,a sufficient condition for the existence of a constrained H? output feedback controller is derived and proved.A linear matrix inequality is used to solve the required damping force.Finally,the designed MRD controller is used to implement the MR damper,and simulation experiments are performed to verify that the constraint H? output feedback control has obvious advantages in the ability to suppress road disturbances.The stability and comfort of the semi-active suspension.There is a Tuned Mass Damper(TMD)in infrastructure projects that is often used as an energy absorbing device in buildings.If it is applied to a semi-active suspension,it will greatly reduce suspension vibration.For MR dampers,The structural characteristics of the semi-active suspension system.The TMD is set on the ideal suspension and designed as a reference model suspension.The model reference adaptive control(MRAC)method is used to make the vibration tracking of the semi-active suspension selected.TMD reference model.Firstly,the parameter values of the TMD device in the reference model were determined according to the theory of suspension invariant points,and then the Lyapunov-MRAC system structure based on state variables was used to design the adaptive controller.In this way,based on the TMD reference model adaptive control method,the optimal damping force required for the magneto-rheological semi-active suspension can be obtained,and the MR damper is still executed by the MRD controller.The model and adaptive controller are built in the simulink simulation environment,and the effectiveness of the adaptive control method is verified through experimental simulation analysis.