中文摘要：

为了论证主动悬架在改善汽车行驶平顺性方面的优越性,在建立车辆1/4主动悬架模型和随机路面激励模型的基础上,采用线性最优控制作为主动悬架的控制策略,并设计线性最优控制器,利用MATLAB建立频域和时域的主动悬架仿真模型,在随机路面激励上对主动悬架分别在频域和时域内进行仿真并与被动悬架进行对比分析.结果表明：主动悬架能够有效降低车身加速度、轮胎动载荷和悬架动挠度,从而显著提高汽车的行驶平顺性和操纵稳定性.该设计的模型建立、最优设计和仿真分析为主动悬架的进一步研究及实际应用提供了有益参考.

英文摘要：

In order to demostrate that the active suspension is superior in improving the vehicle riding comfort,1 /4 vehicle active suspension model and random road excitation model are established. Based on this models,by adopting linear optimal control as the active suspension control strategy,the linear optimal controller is designed. The frequency domain and time domain simulation model of active suspension is established by MATLAB. Frequency domain and time domain simulation of active suspension are carried out respectively under random road excitation and compared with the passive suspension. The results show that the active suspension can effectively reduce the vehicle body acceleration,the dynamic load of the tire and the dynamic deflection of the suspension,thereby improving the ride comfort the handling stability of the vehicle. The model establishement,the optimal design and the simulation analysis of the design provide a useful reference for further research and practical application for active suspension.