摘要
对汽车发动机风扇转子及其支承轴承进行受力分析,采用改进的传递矩阵法对转子系统结构进行分析,建立风扇悬臂转子动力学模型,采用数值迭代法求解。并以某汽车风扇发动机悬臂转子为研究对象,分析轴承间距、带轮张紧力、悬臂长度、转速对风扇悬臂转子临界转速和不平衡响应的影响,结果表明:转子系统1阶临界转速随轴承间距和带轮张紧力变化不明显,2阶临界转速随轴承间距增大而增大,随带轮张紧力增大而减小;1阶与2阶临界转速随悬臂长度增大而明显减小;转子系统的不平衡响应振幅随轴承间距增大而减小,随带轮张紧力增大而增大;转子系统最大振幅随悬臂长度增大而增大,随转速增大而减小。
The force is analyzed for fan rotor and its supporting bearings of automobile engine,the rotor system structure is analyzed by using improved transfer matrix method,the dynamic model of fan cantilever rotor is established,and the numerical iteration method is used to solve it.Taking the cantilever rotor of an automobile fan engine as research object,the effects of bearing spacing,pulley tension,cantilever length and rotational speed on critical speed and unbalance response of fan cantilever rotor are analyzed.The results show that:the first-order critical speed of rotor system does not change obviously with bearing spacing and pulley tension,and the second-order critical speed increases with increase of bearing spacing and decreases with increase of pulley tension;the first-order and second-order critical speeds decrease obviously with increase of cantilever length;the unbalance response amplitude of rotor system decreases with increase of bearing spacing and increases with increase of pulley tension;the maximum amplitude of rotor system increases with increase of cantilever length and decreases with increase of rotational speed.
作者
李心怡
李正美
安琦
LI Xinyi;LI Zhengmei;AN Qi(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《轴承》
北大核心
2022年第4期28-36,共9页
Bearing
