【作者】 杜裴乐；

【导师】 徐龙祥；

【作者基本信息】 南京航空航天大学 ， 机械设计及理论， 2010， 硕士

【摘要】 本文基于冲击阻尼理论设计了磁悬浮转子的冲击阻尼吸振器,并在附加阻尼结构的理论基础上设计了磁悬浮转子的阻尼复合结构。分析了冲击阻尼的吸振原理,并利用复刚度法和能量损耗机理推导出了阻尼复合结构阻尼特性的重要指标——结构损耗因子,定量地研究了影响结构损耗因子的剪切参数、阻尼材料损耗因子以及几何参数,并作了近似优化和综合优化计算。分析总结了磁悬浮转子的噪声来源,为阻尼器针对性的设计提供了理论依据。研究结果表明:通过附加阻尼器可提高磁悬浮转子的阻尼特性,即磁悬浮转子的振动强度减小,同时磁悬浮转子的噪声降低。利用动力学分析软件ADAMS,对冲击阻尼的减振特性进行了仿真。对本文设计的有冲击阻尼吸振器的磁悬浮转子结构在静态悬浮时受脉冲激励或有偏移初速度的前提下,以及旋转状态下进行了仿真研究。仿真结果表明:冲击阻尼块的质量越大,冲击阻尼减振效果越好;碰撞间隙要进行优化,否则冲击阻尼没有减振效果。综合仿真结果,对有冲击阻尼吸振器的磁悬浮轴承系统进行了试验研究,最终得到了冲击阻尼的质量和碰撞间隙参数最优值,进一步证实了冲击阻尼对磁悬浮轴承系统的减振降噪作用。更多还原

【Abstract】 Based on the theory of impact damping and added damping structure, impact damper and composite damping structure in the magnetic rotor are designed. Principle of vibration absorption of impact damping is analyzed, and factor-loss on structure which is the important indicator of the damping characteristics of composite damping structure is derived by complex stiffness method and mechanism of energy loss. Shearing parameter, loss factor of damping material, and geometric parameters are quantitative studied, of which approximate and integrated optimization is calculated. Noise sources of the magnetic rotor are also analyzed and summarized, which is to provide theoretical basis for the design of the damper. The results of theoretical research show that the damping characteristics of the magnetic rotor can be improved by the added damper, specifically speaking, the vibration intensity and noise of the rotor are reduced.Vibration damping characteristics of impact damper are simulated with ADAMS, which is dynamic analysis software. Simulation research has been made when the magnetic rotor is suspended with pulse excitation, or initial velocity offset, and when the magnetic rotor rotates. Simulation results show that the effect on vibration reduction becomes better with the increase of the quality of the impact blocks, and the impact gap should be optimized in order to having good effect on vibration reduction. Combined with the simulation results, experiments have been studied for the magnetic bearing system with the impact damper. Optimal parameters of the impact damper are finally determined; moreover the effect on vibration reduction of the impact damper is further demonstrated.更多还原