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中文摘要：
为了深入揭示滚动轴承的振动特性，以深沟球轴承6304为研究对象，考虑轴承座和套圈变形对轴承振动的影响，建立了轴承一轴承座系统全柔体三维接触非线性动态有限元分析模型。针对轴承刚度的非线性特征，提出了轴承时变刚度计算方法，研究了转动过程中的滚动轴承刚度的时变特性。在充分考虑时变刚度、径向游隙以及非线性接触等非线性因素的基础上，对深沟球轴承进行了转动过程非线性数值仿真，获得了轴承内、外圈和滚动体等结构零件的振动加速度，并分析了轴承内、外圈和滚动体的时域和频域振动特征以及游隙对轴承振动特性的影响，为轴承的减振降噪和运行状态监测提供了理论分析依据。
英文摘要：
In order to gain an in-depth insight into the vibration characteristics of the rolling element bearing, the deep-groove ball bearing 6304 is taken as the investigation object and the flexible multibody finite element model for a 3D contact nonlinear dynamic problem of the bearing-pedestal system is established, taking account of the deformation of the pedestal and the races. To capture the nonlinear characteristics of the bearing stiffness, a method for calculating the time-varying stiffness of the bear- ing is put forward and its time-varying characteristics during running process is studied. Based on the consideration of nonlinear factors such as time-varying stiffness, radial clearance, nonlinear contact, the nonlinear numerical simulation of the running process is made and the vibration accelerations of the inner race, the outer race and the rolling element of the bearing are ob- tained. The vibration characteristics of the inner-race, the outer-race and the rolling element in time domain and frequency do- main are also analyzed. The effect of the radial clearance on the vibration characteristics of the bearing is also studied. The re- suits could provide a theoretical basis for reducing the vibration and the noise of the bearing, and also for running state monito- ring.
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