The dynamic coupling mechanism between vehicle's suspension mass and non-suspension mass is analyzed. The 7-DOF nonlinear model of vehicles with passive suspension is established. The vertical vibration of the nonlinear model under random road excitations is analyzed by means of the method of differential geometry. After the decoupling, the nonlinear system becomes several independent linear subsystems, and the vibration of the suspension spring mass is not affected by the excitations of road surface any more. The simulation results before and after decoupling are compared mutually. It is shown that after the decoupling, the amplitude and frequency of the vertical vibration, pitch vibration and roll vibration of the vehicle's body are greatly attenuated. And the effectiveness of the decoupling algorithm is verified.%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.
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