Research On Structure Optimization And Control Method Of Electromagnetic Active Suspension

Suspension system plays a very important role in vehicle performance when driving.However,the parameters of traditional passive suspension have been fixed when leaving the factory,and its performance can not meet the high demand of people.Active suspension has excellent performance because of its adjustable parameters.Therefore,the study of active suspension has become a research hotspot.Based on the above reasons,this paper designs a linear motor as the electromagnetic actuator of the suspension system.The electromagnetic active suspension has a dual working mode,which can realize the control and energy collection under different working conditions.This paper focuses on the design of the overall structure of the active suspension and the linear motor,and analyzes its performance.On the basis of passive suspension structure optimization,the cylindrical linear motor is proposed as the suspension electromagnetic actuator,combined with inverted damper structure design.The working principle and structural design of the electromagnetic actuator are described in detail.The structural design scheme of the primary and secondary parts of the actuator is preliminarily formulated.The actuator and the inverted damper are jointly designed.The connection forms of each part are designed and integrated into the interior space of the suspension.The two working modes of electromagnetic active suspension are analyzed to determine the overall structure of the suspension.The Ansoft finite element model of the actuator is established,the parameters of the model are set,and the simulation analysis is carried out to verify the thrust constant of the actuator.The internal structure size of the actuator is further optimized to analyze the influence of structural parameters of each part on the electromagnetic force.The mathematical model of the actuator in d-q coordinate system is deduced and established,and the vector control is used to realize the precise control of the actuator.The control performance of the four operating states of the actuator is analyzed.A random road model and a two-degree-of-freedom 1/4 suspension dynamic model are established to determine three performance evaluation indexes: body acceleration,suspension dynamic deflection and tire dynamic load.The dynamic model of active and passive suspension system is established,and the suspension system is controlled by PID control strategy.The dynamic simulation results of suspension under different vehicle speeds and different road conditions are analyzed respectively.The comparison results show that the electromagnetic active suspension has better performance than the passive suspension.The electromagnetic actuator test prototype is designed,the bench structure is designed,and the test bench is built for actuator test analysis.The positioning force and induction voltage of the actuator are tested and compared.