Research On Changeable Damping And Inerter Of MR Semi-active Suspension

As a means of transportation,vehicle provide power for human freight and travel,at the same time,drive rapid economic development and become a pillar industry of the country.As an important part of the vehicle,the suspension system is a group of mechanical components which connect the wheels to the frame or body,which has an important influence on the handling,stability,comfort and safety of the vehicle.As an intelligent material,MR fluid has the advantages of high controllability,fast control speed,and large damping force output range.It can provide damping for semiactive suspension systems and can adjust the suspension performance better compared to passive suspensions.Adapting better to different vibrations caused by the road surface.At the same time.It can bring the adjustment effect that meets the daily needs under the condition of less energy consumption and lower system cost.However,MR suspensions also have shortcomings.It is difficult to achieve better results for vibration in the lowfrequency region.Inertial vessels are better at low-frequency vibration isolation.Therefore,the variable damping and inertia MR semi-active suspension studied in this article The system achieves a good vibration reduction effect by connecting a MR damper and an inertial vessel in parallel.The research work includes the following aspects:(1)Description of the research background of vehicle suspension,MR damper and inertial container.The development and evolution of suspensions are sorted out.Different types of suspensions and the advantages and development status of semi-active suspensions are comprehensively described.Describes the current research status and problems related to MR damper.It also introduces the different implementations of the inertial capacitance device and its application in vehicle suspension.(2)Using the parallel suspension model,complete the shock absorber structure design and theoretical mechanics model analysis.Completed part of the structure design of the MR damper,theoretical mechanics analysis,and verified the design through magnetic field simulation.According to the electromechanical similarity theory,the inertia container is introduced into the suspension system.Complete the partial structure design of the inertial container and derive the mechanical model to analyze the influence of the current on the inertial capacity coefficient.(3)Complete processing and assembly,and test the performance of the shock absorber under different excitation conditions.Use the MTS electro-hydraulic servo test system to analyze the indicator characteristics of the magnetorheological damping unit,inertial vessel unit and shock absorber as a whole,draw indicator curves under different road excitation conditions,analyze the test results,and fit the current Relation with damping force value.(4)Establish a suspension model,analyze the influence of suspension parameters,and adopt a fuzzy control strategy to compare the simulation results.The Simulink toolbox in Matlab is used to establish a dynamic model of a 1/4 vehicle suspension with variable damping and inertia MR semi-active suspension,and the root-mean-square method is used to analyze the inertia coefficient,damping coefficient and elasticity coefficient on the suspension performance.Fuzzy control strategy and random road excitation simulation are established,and the effects of semi-active control and passive suspension under sine excitation and random road excitation are compared to verify the effectiveness of the design scheme in vehicle vibration reduction.