Control Strategy Analysis And Simulation Research Of Human-seat-vehicle Active Suspension System

With the progress of modern science and technology,the emergence of automobiles has greatly changed people’s way of life.Automobiles make our lives convenient,but also bring side effects on human body,especially because of the vehicle vibration caused by the uneven road.Therefore,ride comfort of vehicles is getting more and more attention.Long hours of exposure to vehicle vibration can affect driver’s performance and cause health problems or even accidents,especially for the people who engage in transportation.Hence,providing better ride quality has gradually become an important survival ability of automobile enterprises in the fiercely competitive market.This paper firstly summarizes the definition,structure and classification of suspension system and some main control strategies,and studies the development status of vehicle suspension at home and abroad.Secondly,according to human body vibration,comfort evaluation methods and suspension performance indicators,the white noise is selected as the input of random road surface,and the 13-DOF human-seat-vehicle passive and active suspension dynamic models are established with level C random road surface as input.The parallel control method of seat-vehicle active suspension system is constructed afterwards and the corresponding controllers using PID control and Fuzzy-PID control strategies are designed respectively to control the system model.Then,with the help of Matlab/Simulink software,the corresponding human-seat-vehicle suspension system simulation model was built through the previous dynamic model to simulate the controlled system.At last,the simulation results of passive suspension system and active suspension systems with PID and Fuzzy PID control strategies are compared qualitatively and quantitatively.Taking the vertical acceleration,which includes the head of he human body model,the body of the vehicle and the seat,and the angle acceleration of rolling and pitching of the body of the vehicle as the main evaluation indicators,at the same time,observing whether it has an impact on the indicators such as the vehicle suspension dynamic deflection and dynamic tire load,the results show that human-seat-vehicle system with the active suspension control strategies has dramatically reduced vibration intensity and improved the ride comfort.In conclusion,this paper verifies that active control strategy can effectively improve the dynamic characteristics of human-seat-vehicle system,providing an application reference for future research.