磁悬浮转子跌落在自消除间隙保护轴承上的动力学研究

发布时间：2018-03-17 18:00

本文选题：自消除间隙　切入点：磁悬浮轴承　出处：《南京航空航天大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文针对一种可以自动消除滚动轴承外圈径向间隙的新型保护轴承机构装置，研究转子跌落在自动消除间隙保护轴承的动力学特性。首先简述了自消除间隙保护轴承装置的工作原理，，并在此基础上分析转子组件跌落到装置上的运动形式，转子组件跌落到自消除间隙保护轴承机构上的碰撞运动以及建立了转子组件和支撑座分体碰撞的碰撞力模型，从理论上求解得出转子组件跌落后的最大振动位移、轴承内部碰撞力、支座与轴承外圈的碰撞力以及支座与销钉之间的碰撞力。采用Pro/E对转子组件和自消除间隙机构进行建模利用多体动力学软件ADAMS进行了动力学的仿真分析，分析机构不同参数（转子的不平衡量、轴承的游隙、支撑座表面摩擦系数、支撑座的转动惯量以及支撑座与定位销的摩擦等）对转子组件跌落后动力学行为的影响，根据得到的仿真结果对保护轴承装置进行参数改进。在实验室现有的五自由度磁悬浮轴承试验台上，搭建了一个专门用于转子组件跌落的试验平台，分别对三组不同参数的自动消除间隙保护轴承进行跌落试验，并利用电涡流传感器测得转子组件跌落的位移信号和光纤传感器测得转子组件的外圈转速信号，分析得到转子组件跌落到不同参数保护轴承上的动力学行为。改进参数后的自消除间隙保护轴承机构相比于传统的保护轴承，转子跌落后的振动明显减小，高频转速跌落更加可靠。
[Abstract]:This paper aims at a new type of protective bearing mechanism which can automatically eliminate the radial clearance of the outer ring of the rolling bearing. In this paper, the dynamic characteristics of the rotor drop bearing with automatic clearance protection are studied. Firstly, the working principle of the self-canceling clearance protection bearing device is briefly described, and on this basis, the motion form of the rotor component falling onto the device is analyzed. The impact motion of rotor component falling into self-canceling clearance protection bearing mechanism and the collision force model of rotor component and support seat are established. The maximum vibration displacement of rotor component after falling is obtained theoretically. The internal impact force of bearing, the impact force between bearing and bearing outer ring, and the collision force between bearing and pin. The rotor assembly and self-canceling clearance mechanism are modeled by Pro/E and the dynamic simulation analysis is carried out by using the multi-body dynamics software ADAMS. The effects of different mechanism parameters (rotor unbalance, bearing clearance, friction coefficient on the surface of support seat, moment of inertia of support seat and friction between support seat and pin, etc.) on the dynamic behavior of rotor components after falling are analyzed. According to the simulation results, the parameters of the protective bearing device are improved. A special test platform for rotor component drop is set up on the existing five degree of freedom maglev bearing test bed in the laboratory. The drop test of three groups of automatic eliminating clearance protection bearings with different parameters was carried out, and the displacement signal of rotor component drop was measured by eddy current sensor and the speed signal of outer ring of rotor assembly was measured by optical fiber sensor. The dynamic behavior of rotor assembly falling onto the bearing with different parameters is analyzed. Compared with the traditional protection bearing, the vibration of the self-canceling clearance protection bearing mechanism with improved parameters is obviously reduced. High frequency speed drop is more reliable.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH133.33

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