多自由度车辆模型半主动悬架模糊控制

STUDY ON VEHICLE SUSPENSION SEMI-ACTIVE FUZZY CONTROL FOR A MULTIPLE-DEGREE OF FREEDOM VEHICLE MODEL

考虑到发动机、座椅及乘客等多种因素影响,建立了多自由度车辆模型,并利用RD-1005型可调阻尼器及其阻尼力滞回特性,设计了车辆半主动悬架振动模糊自适应控制系统。模糊控制器以车体振动位移误差及其变化率为输入,用重心法进行模糊推理可调阻尼力,运用龙格-库塔法计算出阻尼器活塞杆的位移。利用MATLAB对模型系统进行了计算机仿真研究,并侧重实现了输出阻尼力的自适应控制算法。仿真结果证实了程序的正确性和理论的可行性,对实际车辆半主动悬架系统的设计有一定参考价值。

Considering influence of factors such as engine, seats and passengers, a multiple-degree of freedom model describing vehicle motion is set up. Using the RD-1005 adjustable damper with its damping force having hysteretic characteristics, a vehicle suspension semi-active fuzzy adaptive control system is developed. The fuzzy controller is built up by taking the vehicle vibration displacement error and its change as inputs, using the balancing method to accomplish fuzzy inference and using Runge-Kutta equation to calculate the displacement of the damper piston rod. Simulations of the model system are carried out by employing MATLAB language. Particularly, the adaptive control algorithm used to calculate the output damping force is realized. The simulated results prove the validity and feasibility of the proposed method.