随机路面激励下车辆垂向振动微分几何解耦控制

分析车辆悬挂与非悬挂质量动力学耦合机理,建立装备被动悬架的整车7自由度非线性模型,利用微分几何方法对该非线性模型受到随机路面激励时的垂向振动进行解耦分析。经过解耦的非线性系统成为独立的互不干扰的线性子系统,悬架簧上质量的振动不受路面激励的影响。进行解耦前后仿真对比分析,结果表明:解耦后的车身垂向加速度、车身俯仰角和侧倾角的振动幅值和频率大幅衰减,验证了解耦算法的有效性。

Differential Geometry Decoupling Control of Vehicle’s Vertical Vibration under Random Road Excitations

The coupling dynamics mechanism between vehicle suspension and non suspension mass were analyzed, the nonlinear model of seven degrees of freedom vehicle with passive suspension was established, the vertical vibration of the nonlinear model under random excitation was analyzed by the method of differential geometry, the decoupled nonlinear system becomes an independent and non disturbed linear subsystem, the vibration of suspension spring mass is not affected by the excitation of road surface. Compared with the simulation results before and after decoupling, it showed that after decoupling the amplitude and frequency of the vertical acceleration of the body heave, pitch and roll were greatly attenuated, and verified the effectiveness of the coupling algorithm.