Research On Variable Inerter And Variable Damping Composite Device Of Suspension

Compared with active suspension,semi-active suspension has the advantages of more energy saving and lower cost.Its performance is better than that of passive suspension.The typical one is MR semi-active suspension(MR suspension).The MR suspension mainly improves the vibration damping effect of the resonance region by adjusting the damping of suspension.However,the vibration damping effect of suspension with only variable damping is limited.The vibration damping performance can be improved by increasing the mass of the spring load or reducing the stiffness of the suspension.However,increasing the spring load will cause the vehicle bulky,and reducing the spring stiffness will reduce the vehicle’s carrying capacity.The inerter can effectively reduce the resonance frequency of the suspension system.In addition,it will not affect the load-bearing capacity of the suspension system,and has a more obvious effect on improving the vibration reduction performance of the suspension system.The inerter is divided into ball screw type,rack and pinion type,hydraulic type,and hydraulic type.Among them,the rack and pinion and roll-to-screw inerters are more studied.The rack and pinion inerter has a serious backlash problem,and the ball screw type inerter container has the problem of greater friction.The hydraulic inerter can avoid the above problems due to no mechanical friction and transmission problems.In this paper,based on the MR suspension,a hydraulic inerter is introduced.Combining with the frequency modulation characteristics of the hydraulic inerter and the energy consumption characteristics of the MR damper,the variable inerter and variable damping composite device of suspension is studied to improve the damping performance.The purpose of this paper is to improve the vibration damping performance of suspension,and take the variable inerter and variable damping composite device as the research object.The design,theoretical modeling and structural design of the variable inerter and variable damping composite device have been researched,mainly involving the following aspects:(1)Theoretical analysis of variable inerter and variable damping composite device design.Based on the design theory of the hydraulic inerter and the variable damping theory of the MR damper,the design idea of the composite device is proposed.The design scheme of the suspension is established.The effect of the three parameters on suspension characteristics is studied.(2)Structural design of variable inerter and variable damping composite device.According to the design theory of the composite device,the realization scheme of the composite device is proposed.The magnetic field analysis of the MR damping unit is completed utilizing ANSYS,and the structural design of the composite device is completed considering factors such as installation size,output force value,and processing cost.The pressure difference model of the composite device is established,and the influence of each parameter in the composite device on the pressure drop output is analyzed by MATLAB simulation.(3)Prototype experiment of variable inerter and variable damping composite device.A prototype of composite device is developed and tested.The theoretical curve and the experimental curve are compared.(4)Simulation analysis of variable inerter and variable damping semi-active suspension.1/4 model of semi-active suspension with variable inerter and variable damping is established,and simulation analysis is carried out.Compared with traditional passive suspension and traditional MR semi-active suspension,the performance of variable inerter and variable damping semi-active suspension is better,which verifies the effectiveness of the suspension based on the variable inerter and variable damping composite device.