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

Magnetorheological damper(MRD)is a new type of damper developed by taking Magnetorheological fluid as the working medium and utilizing the rheological characteristics of Magnetorheological fluid.This damper has the advantages of continuously adjustable damping,high response speed,low power consumption and relatively simple structure,making the semi-active seat suspension based on MRD become a research hotspot.In view of the difficulties in modeling MRD and the complex control of semi-active seat suspension,the following aspects are studied in this paper:(1)This paper introduces the basic structure and working principle of the MRD,determines the working mode,structural form and key size parameters of the MRD.The mechanical performance test platform of magnetorheological damper was built,and its mechanical performance was tested experimentally to obtain the relationship between damping force,excitation current,piston movement velocity and piston amplitude.Finally,the dynamic model of the MRD was established by using the acquired data and the improved BP neural network.(2)The comfort evaluation standard of the vibration damping system and the vibration damping principle of semi-active seat suspension are introduced.According to its structural characteristics,a semi-active seat suspension structure based on MRD is designed,and a dynamic model is established.In order to obtain the best damping ratio under different vibration states,the dynamic characteristics of the system were analyzed,and the simulation model of semi-active seat suspension was used to verify the correctness of the analysis.(3)According to the characteristics of semi-active seat suspension vibration control,a control strategy based on conventional PID,drosophila optimization PID,particle swarm optimization PID,improved drosophila optimization PID and improved drosophila optimization PID controller based on particle swarm optimization was designed,and the control effects of the five controllers were simulated and analyzed.The simulation results show that,compared with the conventional PID,drosophila optimization PID,particle swarm optimization PID and improved drosophila optimization PID,the improved drosophila optimization PID controller based on particle swarm optimization has faster response speed,shorter time to reach the stable state without overshoot,the whole process is stable without random jump,and has better dynamic response characteristics.(4)A semi-active seat suspension vibration reduction experimental platform based on MRD was built,and the hardware and software design of the experimental platform was introduced in detail.Current control experiment,collision excitation vibration reduction experiment and random vibration damping experiment were carried out.The results show that compared with conventional PID,drosophila optimization PID,particle swarm optimization PID and improved drosophila optimization PID,improved drosophila optimization PID controller based on particle swarm optimization has better control effect.