【摘要】 为深入研究工程车辆橡胶悬架的非线性动力学特性,提高车辆的行驶平顺性,建立了车辆两自由度动力学模型及包含悬架刚度立方非线性的运动微分方程,采用多尺度法和李亚普诺夫一阶近似理论求解系统的幅频响应特性、稳定性及其判定.通过数值仿真,获得了主共振和内共振条件下的非线性橡胶悬架系统在不同刚度参数时的幅频响应、转迁集与分岔.结果表明非线刚度参数对车辆系统幅频响应曲线弯曲程度、共振区大小及稳定区域的有很大影响.根据所获得的规律,合理地选择悬架的刚度参数,可以避开系统可能出现的内共振及跳跃等不稳定现象,从而有效地控制车辆的振动.更多还原

【Abstract】 In order to ascertain the nonlinear dynamic characteristics of the rubber suspension of construction vehicle,a two-DOF(degree of freedom) dynamic equation with cubic nonlinear stiffness was established/ The amplitude frequency response was obtained by the method of multiple-scales.The stability of the nonlinear rubber suspension system was analyzed by adopting Liapunov first approximation theory.Via numerical simulation,the nonlinear dynamic behavior of the rubber suspension under the conditions of master resonance and internal resonance was acquired.The relationship between stiffness parameters and system response,bifurcation and transition sets of the system were analyzed.The acquired results show that stiffness parameters should be chosen properly when optimizing the suspension system,so that the instability of rubber suspension system under some parameters can be avoided and the vibration of the vehicle can be controlled effectively.更多还原