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总览 评价 白长青 * （ 西安交通大学 机械结构强度与振动国家重点实验室/航天航空学院； ） 摘要： 考虑滚动轴承中滚珠与滚道间的间隙和轴承运行表面波纹度，提出用于研究滚动轴承-转子系统动力特性的滚动轴承五自由度非线性动力学模型，其中引入了高速下滚
白长青*
（
西安交通大学 机械结构强度与振动国家重点实验室/航天航空学院； ）
摘要：
考虑滚动轴承中滚珠与滚道间的间隙和轴承运行表面波纹度，提出用于研究滚动轴承-转子系统动力特性的滚动轴承五自由度非线性动力学模型，其中引入了高速下滚珠离心力和陀螺力矩的影响。结合转子有限元法建立滚动轴承支撑的转子系统有限元模型，通过数值分析仿真和实验研究分析转子系统的非线性动力特性。实验数据和数值仿真结果是一致的，证实了所建立动力学模型的合理性。发现由于滚动轴承中Hertzian接触力、内间隙等非线性因素的影响，当转速达到系统临界转速的两倍时，激起了系统亚谐共振。
关键词：
滚动轴承；转子；非线性振动；亚谐共振
BAI Changqing*
（
State Key Laboratory for Strength and Vibration of Mechanical Structures/School of Aerospace, Xi’an Jiaotong University； ）
Abstract：
In this paper, a ?ve-degree-of-freedom nonlinear dynamic model is presented for studying the dynamic properties of ball bearing-rotor system supported by ball bearings under the effects of both internal clearance and bearing running surface waviness. The nonlinear dynamic model includes the high-speed effects of ball centrifugal force and gyroscopic moment. Using the finite element method to establish the finite element model of rotor system supported by ball bearings.Through the numerical approach and experimental research, the nonlinear dynamic behavior of ball bearing-rotor system is investigated. Numerical results of this research are in good agreement with experimental data, thus validating the proposed model. It is shown that the resonance frequency is provoked when the speed is about twice the synchroresonance frequency, while the subharmonic resonance occurs due to the nonlinearity of ball bearings which includes the Hertzian contact force, bearing internal clearance, and so on.
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