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为了获得在怠速工况下发动机曲轴带轮端轴颈轴心轨迹动力学行为,文中将曲轴带轮与带轮轴颈从曲轴系统中提取出来作为悬臂转子系统研究。通过建立二自由度动力学方程,运用数值分析的方法进行仿真分析,结果表明带轮小端轴颈轴心轨迹具有复杂动力学行为,具体表现为:在低速时,随着间隙由大变小,轴心轨迹稳定的周期运动进入混沌状态;在高速时,随着间隙由大变小,轴心轨迹不仅从周期运动进入混沌状态,而且在特定的间隙值下,出现拟周期运动。这些结果为发动机带轮曲轴系统匹配设计提供理论参考。
In order to obtain the dynamic behavior of the crankshaft journal end of the engine crankshaft under idle condition, crankshaft pulley and pulley journal are extracted from the crankshaft system as the cantilever rotor system. Through the establishment of two-degree-of-freedom kinetic equation, the numerical analysis method is used to simulate the analysis. The results show that the axial locus of the small-end journal of the pulley has complicated dynamic behavior. The concrete manifestation is that at low speed, , The periodic movement with stable orbital trajectory enters the chaos state. At high speed, as the clearance decreases from large to small, the trajectory of the axis not only enters the chaotic state from the periodic motion, but also appears the quasi-periodic motion under the specific clearance value. These results provide a theoretical reference for the matching design of engine pulley crankshaft system.