【摘要】 为了研究外部激励作用下悬架系统的动态特性,建立了考虑非线性弹簧力和非线性阻尼力的二自由度四分之一车辆动力学模型。采用增量谐波平衡法分析了激励比和非线性刚度系数对悬架系统的动态特性的影响,并得到了各次谐波响应的幅频特性曲线。研究结果表明,在不同的激励比和非线性刚度系数作用下悬架系统表现出超谐波共振、主共振、多解、硬式/软式非线性以及跳跃不连续等强非线性行为。与此同时,悬架系统的超谐波共振响应对激励比具有明显的敏感性。除此之外,各参数对系统的主共振峰值及硬式非线性具有较大的影响。在一定范围内减小激励比和增大非线性刚度系数能够有效地降低悬架系统的振动幅值。更多还原

【Abstract】 In order to investigate the dynamic characteristics of the suspension system with external excitation,a 2-DOF quarter-vehicle dynamic model considering nonlinear spring and damping forces is established. The amplitude frequency curves of all the harmonics with various excitation ratio and nonlinear stiffness coefficient are calculated by using incremental harmonic balance method(IHBM). The results show that the suspension system appears strong nonlinear behaviours,such as super-harmonic resonance,primary resonance,multiple-valued solutions,hardening/softening type nonlinearity, and jumping discontinuity with different excitation ratio and nonlinear stiffness coefficient. Meanwhile,the excitation ratio has obvious sensitivity for the super-harmonic resonance. Besides,the parameters significantly affect the primary resonance and hardening type nonlinearity. The decreasing excitation ratio and enhancing nonlinear stiffness coefficient can effectively reduce the amplitude of vibration of the suspension system within certain realms.更多还原