Reaserch On Model Of Active Suspension And Effect On Related Vehicle Performance Based On AMESim

With the continuous development of modern technology and the rapid growth of social and economic level, the rhythm of social development has become more and more fast. Automobile have gradually become an indispensable part of people’s lives, with the fast pace of life, the automobile industry is also increasing the pace of replacement, while the performance requirements are also higher, which needs a new R & D method and a shorter production cycle for the new models and new accessories, but the performance need to be better. As an important component of vehicle, the suspension system has important influence on the performance of the vehicle. With the continuous breakthrough of the automotive technology, the active suspension technology with its superior performance characteristics, is gradually becoming the mainstream technology of the suspension system in automobile industry.Based on the current research status and development trend of the active suspension, this paper selects the active hydraulic suspension system as the research object of this paper. First the active actuator of hydraulic active suspension is studied and modeled, selects the double cylinder shock absorber as active actuator and the structure and working principle are introduced. According to the model, the mathematical model of the double cylinder shock absorber is analyzed, and the simulation model and force control loop are built in AMESim, then the model is verified by fitting the test data. Then two degrees of freedom and seven degrees of freedom mathematical model of the vehicle are analyzed, and through to present various mainstream control strategy research selects the LQG control strategy as the main active controller. In the Simulink design the LQG controller of active hydraulic suspension, and the random road model is also established in Simulink. Based on the active actuator and controller the active hydraulic suspension model is built through co-simulation of AMESim and Simulink, and in AMESim established with different suspension system with 2DOF vehicle model and the integrated vehicle model with other chassis subsystems.In order to further research the influence of the active hydraulic suspension on the vehicle performance, the simulations and analysis under the relevant conditions are taken. In the time domain analysis and frequency domain analysis for the 2DOF vehicle model equipped with three different suspension systems, the results show that the active hydraulic suspension have a great effect on the vehicle performence, such as the velocity of the body, the suspension deflection and the tire deflection. In addition, to analyze the optimization effect of active hydraulic suspension on vehicle performance, the related simulations are done. The performence of the vehicle anti-roll and anti-pitching is improved, the vehicle with active hydraulic suspension has an effective improve on the vehicle handling and stability performance.