在磁悬浮轴承系统中,需要一套保护轴承作为磁悬浮轴承失效后转子的临时支撑,保护设备不受损坏.传统保护轴承往往无法支撑速转子旋转,且难以承受转子跌落后所带来的振动和冲击.针对传统保护轴承的不足,本文提出了将双层滚珠轴承作为保护轴承来使用,并进行了一系列相关研究. 在双层滚珠轴承作为保护轴承使用之前,首先对其力学特性进行了分析.基于拟静力学原理,在考虑轴承所承受的径向载荷,轴向载荷,滚珠自身离心力以及陀螺力矩联合载荷作用下,建立了双层滚珠轴承的力学模型,基于MATLAB平台,编制了单,双层滚珠轴承力学特性分析的计算程序,并研究了相关参数对轴承力学特性的影响，搭建了转子—轴承系统试验平台,对仿真结果进行了试验验证.研究结果表明:内外层轴承节径比直接影响到双层滚珠轴承的转速分配;在相同的工作状态下,相对于单层滚珠轴承,双层滚珠轴承具有较小的径向和轴向支撑刚度;外载荷和工作转速影响着单,双层角接触球轴承的滚珠接触角的变化,滚珠的离心力使得滚珠与相应的内,外滚道间的接触角不再相等;外载荷,工作转速,滚珠材料,沟曲率半径和滚珠初始接触角对单,双层角接触球轴承轴向和径向变形均有一定的影响;径向游隙,工作转速和径向载荷对单,双层深沟球轴承的径向变形存在一定的影响. 在对双层滚珠轴承力学特性研究的基础上,对转子跌落到
In the magnetic levitation bearing system, a set of protective bearings is needed as temporary support for the rotor after the magnetic levitation bearing fails, to protect the equipment from damage. Traditional protective bearings often cannot support the rotation of the high-speed rotor and are difficult to withstand the vibration and impact caused by the rotor falling. In response to the shortcomings of traditional protective bearings, this article proposes to use double-layer ball bearings as protective bearings and conducts a series of related studies Before the double-layer ball bearing was used as a protective bearing, its mechanical characteristics were analyzed first. Based on the principle of quasi Statics, the mechanical model of the double-layer ball bearing was established by considering the radial load, axial load, centrifugal force of the ball itself and the combined load of gyroscopic torque. Based on the MATLAB platform, the calculation program for the mechanical characteristics analysis of single and double-layer ball bearings was compiled, And studied the influence of relevant parameters on the mechanical characteristics of bearings, built a rotor bearing system test platform, and verified the simulation results through experiments. The research results showed that the pitch diameter ratio of the inner and outer layer bearings directly affects the speed distribution of the double-layer ball bearings; Under the same working state, compared to single-layer ball bearings, double-layer ball bearings have smaller radial and axial support stiffness; The external load and working speed affect the changes in the ball contact angle of single and double layer angular contact ball bearings. The centrifugal force of the ball causes the contact angle between the ball and the corresponding inner and outer raceways to no longer be equal; External load, working speed, ball material, groove curvature radius, and initial contact angle of the ball have certain effects on the axial and radial deformation of single and double layer angular contact ball bearings; The radial clearance, working speed, and radial load have a certain impact on the radial deformation of single and double layer deep groove ball bearings On the basis of studying the mechanical characteristics of double-layer ball bearings, the rotor drops to