Simulation And Analysis Of Automotive Magnetorheological Semi-active Suspension Control

With the rapid development of China's economy and the rapid construction of high-speed roads,people's car ownership has gradually increased,and people's attention to the car has gradually shifted from the original vehicle durability to vehicle ride smoothness and comfort.Vehicle suspension system is one of the main components of vehicles,and its performance plays a key role in the stability and comfort of vehicles.The research of automobile suspension system has always been the focus of attention of academia and vehicle manufacturers.The biggest disadvantage of passive suspension is that spring stiffness and damper's damping coefficient are not adjustable.Active suspension has high manufacturing cost and complex structure.Semi-active suspension has relatively simple structure,lower manufacturing cost than active suspension,and can realize damping adjustment.So semi-active suspension has become the main direction of suspension research.Based on MR damper as the executive unit of semi-active suspension,the suspension system is taken as the research object,and the improvement of vehicle ride comfort and handling stability is taken as the research objective.The passive suspension and semi-active suspension models are simulated and analyzed in Matlab respectively.The dynamic models of 1/4 vehicle passive suspension and semi-active suspension are established,the corresponding dynamic and discrete equations are established,the step signal model of road excitation is established,the structure and performance of Bouc-Wen model and Bingham model are analyzed,the calculation method of damping force of Bingham MR damper model is deduced,and the Bingham simulation model is established.The model of skyscraper damping control and the model of skyscraper damping control are established,and the simulation analysis of these two control methods is carried out.The mixed damping control model of skyscraper and skyscraper is established,and the influence of damping distribution coefficient on vehicle vibration is analyzed.The BP neural network inverse model of MR damper is established,and the semi-active suspension under the mixed damping control strategy is simulated and analyzed.The whole control strategy of semi-active suspension is put forward.The control methods and principles of fuzzy control and PID control are expounded.The generation process of Fuzzy-PID controller is introduced in detail.Finally,the semi-active suspension controlled by Fuzzy-PID is simulated and analyzed under the input of random road surface and step excitation road surface.Several different control strategies are synthesized and compared in terms of control effect,feasibility of control strategy and complexity of control algorithm.