| Along with the rapid development of our national economy and the people’s living standard, vehicle has gradually become an important part in people’s life and an indispensable traffic tool. As a key component of vehicle’s Chassis, Suspension, to a great extent, determines the comfort and stability of a car. As an emerging smart materials, magnetorheological materials has been widely applied in many fields. The latest MRE smart spring and MR Damper can help to improve comfort when moving and stability when driving, as well as to reduce the damage to the key Bearing parts of vehicles and the damage to the road by vehicles, especially Heavy Vehicle. Nowadays, most investigations are based on leveraging vibration control of magnetic damper vehicle suspension systems. But the study based on Vibration control magnetic fluid elastomeric spring intelligent vehicle suspension systems is just a beginning, which is an important area in the study of new vehicle active suspension vibration control. Hence this thesis investigates in automotive active suspension system based on MRE smart spring. And the main content is as follow:Firstly, we use software to simulate and study the Hysteresis features of MR Smart actuator spring of the system. By modifying Bouc-wen model, we get the curves of displacement and force, speed and force of MR Smart springin and various current amplitude. Then we build the pavement random white noise input signal modeland mathematical model of four degrees of freedom of one half of the suspension system, as well as a simulation in Matlab/Simulink. By/In Random road excitation, we construct PID controller、Fuzzy PID controller and adaptive fuzzy-PID controller based on the one-half of four degrees of freedom vehicle dynamics model. Finally, we evaluate our methods by simulating and analyzing a certain type of vehicles. The simulation results indicate that when comparing to the Passive suspension these three control strategies largely improve the ride of the car when driving. The controlling performance of the three control strategies are compared and analyzed. The results show that the performance of Adaptation fuzzy-PID control outweighs the other two strategies in cutting the other two strategies in cutting the performance index values such as body vertical acceleration, dynamic load tire and suspension dynamic deflection, which makes cars more ride comfort when moving and more stable when driving. |
