本文選題：磁性液體　切入點：阻尼減振性能　出處：《北京交通大學》2014年碩士論文　論文類型：學位論文

【摘要】：由于各種外力的存在,在軌運行的航天器并不總是處于理想失重狀態(tài),航天器上的某些長直結(jié)構件如太陽能帆板、衛(wèi)星天線等易產(chǎn)生低頻振動,這種振動會對航天器的正常運行造成極大危害。為了減少這種振動,本論文研究了基于磁性液體粘性耗能的被動式磁性液體阻尼減振器,理論上分析了磁性液體阻尼減振機理,實驗探究了各參數(shù)對磁性液體阻尼減振性能的影響。 本論文重點進行了以下工作： 1.對磁性液體阻尼減振機理進行了理論分析,研究了永磁體在磁性液體中的受力懸浮,并對磁性液體阻尼減振進行了流體動力學建模,理論推導出磁性液體阻尼減振粘性耗能公式； 2.考慮到磁性液體阻尼減振器的工作原理,對磁性液體的粘溫特性和磁粘特性進行了實驗研究,并從微觀機理上分析了實驗結(jié)果； 3.初步設計了磁性液體阻尼減振器,合理選取了實驗用磁性液體、永磁體材料以及減振器外殼材料。為了減小重量和體積,對初步設計了磁性液體阻尼減振器進行了優(yōu)化。 4.為了研究磁性液體的阻尼減振性能,設計并搭建了實驗臺,提出了用減振率來衡量磁性液體的阻尼減振性能； 5.研究分析了磁性液體阻尼減振粘性耗能公式,得出磁性液體粘度、磁性液體加入量、圓柱永磁體直徑和黃銅板懸臂梁振動頻率是影響磁性液體阻尼減振性能的主要因素,實驗研究了這些因素對磁性液體阻尼減振性能的影響規(guī)律,并從機理上分析了實驗結(jié)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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB535.1

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