Simulation Research Of Hydraulic Servo Road Simulation Rig And CMAC-PID Compound Control

The road simulation equipment has become an important test-equipment in the automobile industry, and it could save plenty of time in R&D and improve the efficiency of experiments by using it. According to the construction of the road simulation test rig in the vehicle engineering lab of our university, this paper mostly discusses the main theory and technology involving hydraulic-servo road simulation system, and do systemic research on such problem as the mathematical model of road surface roughness, design of the hydraulic-servo system, application of CMAC control and so on.The paper firstly summarizes the development and the present situation of the road simulation system technology. The generating way of the road surface roughness signal is studied, and the random road surface signal is simulated by using AR model method, and then the expected power spectral density is compared with the simulated power spectral density, to prove the validity of simulation road surface and the advantage it has to other methods.Secondary, according to the technology requirement of the road simulation test rig, the parameters of the hydraulic-servo system are designed by using the 3a principle of the random signal. And then a simulation model of the system is set up in AMESim application, according to the result of designation. What's more, the designed parameters are optimized by using Genetic algorithm, and the result shows the veracity of the system parameters and the optimization method.Thirdly, according to the problem that high-frequency random road surface excitation is need to be realized in road simulation system, a compound controller is designed basing on CMAC and PID. And then the specific structure and relevant algorithm of the controller are given, the Simulink simulation model is also set up. A co-simulation model of the servo system is set up by using AMESim and Simulink, and the co-simulating result shows that comparing with the normal PID control, the designed controller has such character as small output error, good practicality, strong self-adaptability and so on.