Research On Active Suspension Technology Of A Certain Type SUV Based On Electromagnetic Linear Actuator

It is difficult for traditional passive suspension to consider both vehicle driving smoothness and handling stability,while active suspension can provide real-time active force for vehicle according to vehicle driving status and road surface condition,so that the driving smoothness and handling stability of vehicle with active suspension can be improved at the same time.Therefore,the research on active suspension based on self-developed electromagnetic linear actuator is conducted in this paper.Firstly,a vehicle dynamics model is established based on the parameters of a certain type of SUV,including a suspension subsystem and a steering subsystem.And a frequency-domain model and a time-domain model of road surface are established.The performance parameter requirements of electromagnetic linear actuator are obtained,by simulation and analyzing.Secondly,the installation dimensions of electromagnetic linear actuator on the SUV suspension are analyzed.And the specific design objectives of electromagnetic linear actuator are obtained,considering the performance parameter requirements of electromagnetic linear actuator.Based on the specific design objectives,the electromagnetic linear actuator is designed.A mathematical model and a finite element model of electromagnetic linear actuator are established.The influence of main design parameters on electromagnetic characteristics is obtained and the specific structure and parameters of electromagnetic linear actuator are determined,through simulation analysis.Besides,the relationship between electromagnetic thrust and input current is obtained,through the thrust characteristic test of electromagnetic linear actuator prototype.Finally,a fuzzy PID control method of active suspension is proposed,and a fuzzy PID controller is designed.The collaborative simulation of MATLAB and ADAMS demonstrates that,compared with the passive suspension,the vehicle body acceleration,suspension dynamic deflection and tire dynamic displacement of active suspension are reduced by 25.60%,26.41% and 10.08% respectively,under the excitation of C level road roughness.And the vehicle driving smoothness and handling stability is improved.Furthermore,the effectiveness of control method is verified theoretically,through 1/4 active suspension test.