高速滚动轴承-转子系统非线性特性研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (20) : 168-176.

论文

高速滚动轴承-转子系统非线性特性研究

王梓，朱才朝

作者信息 +

Investigation on the nonlinear characteristics of high-speed rolling element bearing-rotor systems

WANG Zi,ZHU Caichao

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文章历史 +

摘要

滚动轴承是旋转机械设备中极其重要的基础件。高速运转情况下，滚动轴承-转子系统振动噪声问题突出的主要根源在于轴承支承力以及转子动不平衡力的强非线性特征。提出滚动轴承平均刚度和局部刚度的定义和计算方法，分析轴承的支承特性以及扰动特性。考虑轴承刚度的时变性和载荷非线性以及转子动态偏心位移导致的不平衡力激励，提出一种改进的轴承-转子系统一体化动力学模型。以两种不同类型的轴承为例，通过有限元/接触力学半解析法(finite element/contact mechanics mixed method, FE/CM)得到完整周期下滚动轴承三维载荷-位移分布曲线，分析轴承平均刚度与局部刚度的非线性特性，通过改进的轴承-转子动力学模型准确的获取滚动轴承动态支承力的载变与时变特征，观察到由于滚动轴承动态激励作用导致强非线性振动响应。

Abstract

A rolling element bearing is an extremely important basic component in rotating machinery.For high-speed work condition, the main source for the vibration and noise problem of the rolling element bearing-rotor system lies in the strong nonlinear characteristics of bearing forces and rotor unbalance force.Two different bearing stiffness calculation techniques were proposed and the carrying capacity and disturbance resisting ability of bearing were analyzed in this work.An improved analysis model for the nonlinear vibration behaviors of the bearing-rotor coupled system, which is excited by the time-dependent and nonlinear characteristics of bearing supporting force and the unbalance force from rotor dynamic displacement, was proposed.Two different types of bearings were brought in for case studies.The comprehensive 3-dimensional load-displacement distributions over one whole ball pass cycle were captured by a Finite Element/Contact Mechanics mixed method.The nonlinear characteristics of mean stiffness and alternating stiffness of rolling element bearings were discussed.The load-dependence and time-variation characteristics of rolling element bearing dynamic support forces were obtained through the improved dynamic model and the strong nonlinear vibration responses caused by the bearing dynamic excitations were observed.

导出引用

王梓，朱才朝. 高速滚动轴承-转子系统非线性特性研究[J]. 振动与冲击, 2021, 40(20): 168-176

WANG Zi,ZHU Caichao. Investigation on the nonlinear characteristics of high-speed rolling element bearing-rotor systems[J]. Journal of Vibration and Shock, 2021, 40(20): 168-176

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