Performance Simulation Analysis Of A Double Skyhook Semi-Active ISD Suspension Based On An Actuator Test Model

Relying on the advantages of better performance than passive suspension and lower cost than active suspension,semi-active suspension has gradually become the main direction of suspension system development.Skyhook damping control is a mature method of semiactive suspension control that allows the vehicle to better adapt to changes in road conditions by dynamically adjusting damping.However,the skyhook damping suspension has the issue of vehicle suspension smoothness varying with load.At the same time,the skyhook inertance suspension,also based on skyhook control,uses the inerter to amplify the virtual mass,allowing the vehicle to better adapt to changes in load,effectively improving driving smoothness.But this suspension does not involve damping adjustments,resulting in the vehicle’s suspension not adapting to changes in road conditions.Therefore,this paper combines the characteristics of skyhook damping suspension and skyhook inertance suspension to propose a double skyhook controlled semi-active ISD(Inerter-Spring-Damper)suspension,so that the vehicle can obtain load adaptability and road condition adaptability at the same time.First,a virtual double skyhook suspension system is proposed and a mechanical impedance model of the virtual double skyhook suspension is established using electromechanical similarity theory.The parameters of the virtual double skyhook suspension are optimized using a multi-target genetic algorithm,and the double skyhook suspension were preliminarily validated through frequency response and power spectrum response simulation analysis to improve the driving smoothness of the vehicle under different loads and different road conditions.Secondly,a semi-active implementation method for virtual double skyhook system is proposed,and three control strategies based on different actuator forms are proposed.An adjustable device integrated by inerter and damper is designed for the joint double skyhook control strategy.Furthermore,a rig test was carried out based on the designed adjustable device integrated by inerter and damper.The damping force was isolated and the damping model was fitted by quasi-static and static mechanical characteristics tests,which verified that the damping model of the device is highly accurate and can meet the engineering needs of the combined double skyhook control strategy.Finally,the damping model and the combined double skyhook control strategy were revised based on the results of the actuator stand test.Based on this,the control effect of the double skyhook semi-active suspension was analyzed by time domain and frequency domain simulations,and the results showed that the double skyhook semi-active suspension effectively improved driving smoothness under different loads and different road conditions.