The Development And Application Of Semi-active Suspension System Test Platform

Suspension systems are all connected devices collectively force transmission between the frame and body, is to ensure that cars ride and comfort of the important components.Traditional suspension spring stiffness and damping is based on experience or method to determine the optimal design, according to the suspension system design parameters, in the car driving course, its performance remains unchanged and can not be adjusted, affect the car’s ride comfort and comfort, the rapid development in technology today, the traditional suspension system has been unable to meet human requirements for vehicle performance.The emergence of active suspension changed the status quo, their stiffness and damping can be adjusted according to the state of motion vehicles and road conditions in real time to adjust the stiffness and damping, so that the suspension damping in the best condition, but because of the difficulty of its development, controlling the complexity of manufacture and use of such expensive elements, yet to be widely applied.On this basis, derived from the semi-active suspension, semi-active suspension only overcome the shortcomings of the passive suspension performance on the driving performance of the car, but also to avoid the high cost of active suspension control complex and other shortcomings, to improve vehicle ride and comfort have a significant effect, so the development of semi-active suspension system in recent years has gradually become a hot new car technology.In this paper, the development of semi-active suspension system test platform for the goal, design and development testing platform, multi-condition bench, test bench to provide a semi-active suspension system developmentFirstly, according to the vehicle ride comfort evaluation index (the wheel acceleration, the vehicle body acceleration, suspension dynamic deflection), design and development of test platform, put forward the technical route, test method, the PC program development and testing system, including the inverter control program and data acquisition program. Secondly, the vehicle of different bench test according to the test method research, record and save the test data, the preliminary analysis of test data, verified the vibration platform design to achieve the desired design requirements. Finally, the state space of the coefficient matrix method to derive the seven degrees of freedom model of vehicle, and the establishment of seven degrees of freedom model of vehicle in Matlab/Simulink, the use of Matlab programming mix with Isight build seven degrees of freedom model of system identification, identification results obtained. The comparative analysis of the accuracy of the identification algorithm to validate the model with experimental data and identification data. Provide test data with seven degrees of freedom model model for the development of semi-active suspension system.