中文摘要：

为了分析路面不平度激励幅值、激励频率、减振器阻尼系数和非线性阻尼系数对空气悬架系统发生分岔和混沌的影响，文章以某客车为研究对象，考虑阻尼非线性和空气弹簧非线性建立单自由度1／4车体空气悬架系统模型，采用相轨迹图、Poincar＆233;映射图、时间历程图、功率谱图和Lyapunov指数验证悬架系统的运动状态。数值仿真表明：路面不平度激励幅值在0.036～0.100 m之间悬架系统发生分岔和混沌运动，激励频率在1.50～3.24 Hz之间发生跳跃和分岔现象，阻尼系数在0～300 N／（m · s－1）之间作混沌运动，非线性阻尼系数的变化没有引起分岔。即路面不平度激励幅值越大，汽车发生混沌运动的可能性越大；减振器阻尼系数越小，汽车越容易发生混沌运动；非线性阻尼系数对汽车发生分岔和混沌的影响较小。

英文摘要：

In order to analyze the effect of the road irregularity excitation amplitude ,the excitation fre‐quency ,the shock absorber damping coefficient and nonlinear damping coefficient on the bifurcation and chaos of the air suspension system ,a one‐degree‐of‐freedom model of 1/4 vehicle air suspension system is established by taking a bus as study object and considering damping nonlinearity and air spring nonlinearity .The motion state of the system is verified by phase diagram ,Poincar＆233; map ,time history diagram ,spectrum diagram and Lyapunov index .The numerical simulation results show that the system is prone to bifurcation and chaos with road irregularity excitation amplitude in the range of 0.036~0.100 m ;chaos with damping coefficient between 0 and 300 N/（m · s-1 ）;the system shows jumping phenomenon and bifurcation with the excitation frequency in the range of 1.50‐3.24 Hz .The change of nonlinear damping coefficient does not cause bifurcation .The greater the road irregularity excitation amplitude ,the greater the car has the chance of chaotic motion .The smaller the shock ab‐sorber damping coefficient ,the more the system is prone to chaotic motion .The nonlinear damping coefficient has little effect on the bifurcation and chaos of the car .