磁悬浮转子系统减振阻尼器研究

发布时间：2018-11-14 10:22

【摘要】：本文主要对用于磁悬浮转子系统减振的鼠笼弹支—金属橡胶阻尼器进行了设计研究。磁悬浮转子系统因自身刚度阻尼相对较小，存在振动抑制能力差的问题，将系统支承在能够提供附加刚度和阻尼的鼠笼弹支—金属橡胶阻尼器上，则可有效改善系统的振动抑制能力。主要内容如下：首先，分析了金属橡胶的阻尼减振机理，并结合原有磁悬浮转子系统试验台结构尺寸以及系统动态性能的需要，，完成了阻尼器各组件的结构设计及加工。其次，研究了磁悬浮轴承转子系统在不同阻尼下的不平衡响应，并初步探究了阻尼器不同阻尼对转子减振效果的影响。基于ANSYS Workbench的Exploration优化模块，以支承在阻尼器上转子系统的不平衡响应作为目标函数，完成了阻尼器的刚度和阻尼参数优化。另外，利用传递矩阵法分析了引入阻尼器前后转子的不平衡响应，并与有限元法所得结果进行了对比。然后，根据优化得出的阻尼器最佳刚度值，对鼠笼弹支和金属橡胶的刚度进行分配，并基于ANSYS Workbench的静力学分析模块完成鼠笼弹支的结构设计。最后，对引入阻尼器前后的转子系统分别进行试验模态分析以及稳态和瞬态不平衡响应试验。由于磁悬浮轴承刚度、阻尼难以准确测量，在仿真时取其各路刚度相同，而实际各路刚度值偏差较大，使最终试验结果与仿真结果未能保持一致性。但对比试验结果仍可发现，鼠笼弹支—金属橡胶阻尼器的引入增大了转子系统的模态阻尼比，有效降低了转子通过一弯临界转速时的振动位移，使转子振动特性得到有效改善。
[Abstract]:In this paper, the design and research of the metal rubber damper for the magnetic suspension rotor system are presented. Because the stiffness damping of magnetic suspension rotor system is relatively small, there is the problem of poor vibration suppression ability. The system is supported on the cage projectile support metal rubber damper which can provide additional stiffness and damping. It can effectively improve the vibration suppression ability of the system. The main contents are as follows: firstly, the damping mechanism of metal rubber is analyzed, and the structural design and processing of the damper components are completed according to the structural size of the original maglev rotor system test rig and the need of the dynamic performance of the system. Secondly, the unbalanced response of magnetic bearing rotor system under different damping conditions is studied, and the effect of different damping of damper on rotor vibration damping is discussed. Based on the ANSYS Workbench Exploration optimization module, the stiffness and damping parameters of the damper are optimized by taking the unbalanced response of the rotor system supported on the damper as the objective function. In addition, the unbalance response of rotor before and after introducing damper is analyzed by transfer matrix method, and the results are compared with those obtained by finite element method. Then, according to the optimum stiffness of the damper, the stiffness of the cage bomb and metal rubber is allocated, and the structure design of the cage support is completed based on the statics analysis module of ANSYS Workbench. Finally, the experimental modal analysis and transient unbalance response tests of the rotor system before and after the dampers are carried out. Because the stiffness of the magnetic bearing is difficult to be measured accurately, the stiffness of the bearing is the same in the simulation, but the deviation of the actual stiffness is large, which makes the final test result and the simulation result not consistent. However, the experimental results show that the introduction of the squirrel-cage project-metal rubber damper increases the modal damping ratio of the rotor system, effectively reduces the vibration displacement of the rotor when it passes through the first bending critical speed, and effectively improves the rotor vibration characteristics.
【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】：TB535.1

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