Abstract: In order to improve the ride comfort of commercial vehicles, this study combined with a commercial truck semi-active suspension system design research. Firstly, the structure of the magneto-rheological (MR) damper is designed, and the structure is optimized with Ansoft finite element analysis software to avoid the under-saturation and over-saturation of the magnetic field strength of the MR damper. Secondly, fuzzy control and proportional integral derivative (PID) control are used to track the damping force of the damper, so that the damping force is always close to the best comfort and safety. Finally, the damping performance of the damper is simulated based on Matlab/Simulink numerical analysis software, and a semi-active suspension system based on MR damper is designed. The MR damper designed in this study has a compact structure and is easy to be integrated. The final simulation results show that compared with the traditional passive suspension, the semi-active suspension has better vibration reduction effect and faster response speed, which makes the vehicle have better ride comfort and driving safety.

Key words: Magneto-rheological effect; Semi-active suspension; Fuzzy PID control; Damper; Matlab/Simulink

摘要： 为提高商用车乘坐舒适性，文章结合某款商用载货汽车进行半主动悬架系统的设计研 究。首先进行磁流变阻尼器结构设计，并使用 Ansoft 有限元分析软件对阻尼器进行结构优化， 避免磁流变（MR）阻尼器磁场强度的欠饱和与过饱和；其次采用模糊控制与比例-积分-微分 （PID）控制相结合的方式对阻尼器阻尼力大小进行控制输出，使得阻尼力始终等于或接近最 佳舒适性与安全性要求下的阻尼力大小；最后基于 Matlab/Simulink 数值分析软件对阻尼器减 振性能进行仿真，完成了一款基于磁流变阻尼器的半主动悬架系统设计。此研究中的磁流变 阻尼器结构紧凑，易于集成化设计，通过最终仿真结果表明，与传统被动悬架相比较，此半 主动悬架减振效果更为优秀，响应速度更快，使得车辆具有更好的平顺性、舒适性与行驶安 全性。

关键词: 磁流变效应；半主动悬架；模糊 PID 控制；阻尼器；Matlab/Simulink