Research On Solenoid Valve Damper Suspension Based On FOA Optimization Algorithm

With the development of science and technology and the improvement of people's quality of life,the expectations of people on the performance of automobiles such as driving safety,riding comfort and handling stability are becoming higher and higher.When purchasing an automobile,consumers' requirements on the safety,comfort and intelligent experience of the automobile have become necessary conditions that must be met.In the structure of the automobile,the performance of the damping system is one of the indexes for people to evaluate the overall performance of the automobile,and the performance of the suspension system determines the performance of the automobile vibration damping system.Among them,the semi-active suspension system of solenoid valve damper has a wide application prospect in the automobile industry because of its simple structure and reliable vibration reduction performance,which can meet the different requirements of damping force in different working conditions.However,due to the lack of simple and effective vehicle driving condition identification technology,no practical control law can make the suspension performance to achieve real-time optimal damping coefficient matching and other reasons,which made the development of the solenoid valve damper semi-active suspension system restricted.In this dissertation,the semi-active suspension and its control strategy of solenoid valve damper in multi-road conditions were studied.The FOA optimization algorithm was used to optimize the parameters of the suspension system to improve the vibration reduction performance of the suspension system.Through the study of the damping coefficient of the damper under different working conditions and the multi-level road random excitation of the automobile,a simulation model of the solenoid valve damper semi-active suspension system which can automatically adjust the damping coefficient according to the driving conditions was built,and a controller with excellent performance was designed to improve the vibration reduction performance of the suspension system.The research content and work is showed as follows:(1)Based on the structure of the ordinary two-barrel inflatable hydraulic damper,the working principle and dynamic characteristics of solenoid valve damper of a certain type of automobile were analyzed.According to the basic principle of the solenoid valve damper and the related theory of fluid mechanics,the structural design of the damper was completed,and the finite element statics analysis of the main components of damper was carried out,then the mathematical model and damping characteristics simulation test of the damper under different working conditions were established.(2)An electro-hydraulic servo suspension test system was built to complete the bench test of the damper.Through comparing the simulation results and the bench test results to analyze performance of damper and mathematical model whether meet the requirements.(3)According to the basic principle and improvement strategies of conventional FOA optimization algorithm,the optimization of the FOA optimization algorithm was proposed.Five classical test functions were used to detect the optimization effect of the modified FOA optimization algorithm,and then the modified FOA optimization algorithm was applied to the optimization of suspension system parameters to improve the damping performance of the suspension system.(4)Taked the semi-active suspension system as the research object,the basic principles of random excitation signals on different roads and semi-active suspension system were studied,and the mathematical model of semi-active suspension and the mathematical model of random multi-stage road conditions were established.Based on the research of switch control algorithm,the semi-active suspension system simulation model controlled by the switch control algorithm was built and its multi-level road conditions simulation test was carried out to detect the control effect of the switch control algorithm.The results indicated that the designed switch controller can effectively improve the vibration reduction performance of the suspension system.