磁性液体的阻尼减振性能研究

发布时间：2018-03-23 07:02

本文选题：磁性液体　切入点：阻尼减振性能　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于各种外力的存在,在轨运行的航天器并不总是处于理想失重状态,航天器上的某些长直结构件如太阳能帆板、卫星天线等易产生低频振动,这种振动会对航天器的正常运行造成极大危害。为了减少这种振动,本论文研究了基于磁性液体粘性耗能的被动式磁性液体阻尼减振器,理论上分析了磁性液体阻尼减振机理,实验探究了各参数对磁性液体阻尼减振性能的影响。本论文重点进行了以下工作： 1.对磁性液体阻尼减振机理进行了理论分析,研究了永磁体在磁性液体中的受力悬浮,并对磁性液体阻尼减振进行了流体动力学建模,理论推导出磁性液体阻尼减振粘性耗能公式； 2.考虑到磁性液体阻尼减振器的工作原理,对磁性液体的粘温特性和磁粘特性进行了实验研究,并从微观机理上分析了实验结果； 3.初步设计了磁性液体阻尼减振器,合理选取了实验用磁性液体、永磁体材料以及减振器外壳材料。为了减小重量和体积,对初步设计了磁性液体阻尼减振器进行了优化。 4.为了研究磁性液体的阻尼减振性能,设计并搭建了实验台,提出了用减振率来衡量磁性液体的阻尼减振性能； 5.研究分析了磁性液体阻尼减振粘性耗能公式,得出磁性液体粘度、磁性液体加入量、圆柱永磁体直径和黄铜板悬臂梁振动频率是影响磁性液体阻尼减振性能的主要因素,实验研究了这些因素对磁性液体阻尼减振性能的影响规律,并从机理上分析了实验结果。
[Abstract]:Due to the existence of various external forces, spacecraft in orbit are not always in ideal weightlessness. Some long-straight structures on the spacecraft, such as solar panels and satellite antennas, are prone to produce low-frequency vibration. In order to reduce the vibration, the passive magnetic fluid damping damper based on the viscous energy dissipation of magnetic fluid is studied in this paper, and the mechanism of damping vibration of magnetic fluid is analyzed theoretically. The effect of various parameters on the damping and damping performance of magnetic fluid is investigated experimentally. This paper focuses on the following work:. 1. The damping mechanism of magnetic fluid is theoretically analyzed, the force suspension of permanent magnet in magnetic fluid is studied, and the hydrodynamic model of damping vibration reduction of magnetic fluid is established. The formula of damping and viscous energy dissipation of magnetic fluid is derived theoretically. 2. Considering the working principle of the magnetic liquid damping damper, the viscosity and temperature characteristics of the magnetic fluid and the magnetic viscosity characteristic are studied experimentally, and the experimental results are analyzed from the microscopic mechanism. 3. The magnetic liquid damping damper is designed, and the magnetic liquid damping damper is optimized to reduce the weight and volume of the shock absorber by selecting the magnetic liquid, the permanent magnet material and the shell material of the shock absorber. 4. In order to study the damping and vibration absorption performance of magnetic fluid, an experimental platform is designed and built, and the damping rate is proposed to measure the damping and damping performance of magnetic fluid. 5. The formula of damping damping and viscous energy dissipation of magnetic fluid is studied and analyzed. The main factors affecting the damping and damping performance of magnetic fluid are the viscosity of magnetic fluid, the amount of magnetic fluid, the diameter of cylinder permanent magnet and the vibration frequency of cantilever beam of brass plate. The influence of these factors on the damping and damping performance of magnetic fluid is studied experimentally, and the experimental results are analyzed from the mechanism.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1

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