| 研究生: |
陳亭宇 Chen, Ting-Yu |
|---|---|
| 論文名稱: |
以磁力固定精密機台基座之動態特性研究 Dynamic Characteristics of Precision Machinery Foundation Fastened by Magnetic Force |
| 指導教授: |
姚昭智
Yao, Chao-chih |
| 學位類別: |
碩士 Master |
| 系所名稱: |
規劃與設計學院 - 建築學系 Department of Architecture |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 103 |
| 中文關鍵詞: | 磁力 、動態剛度 、精密機台基座 |
| 外文關鍵詞: | precision machinery foundation, dynamic stiffness, magnetic force |
| 相關次數: | 點閱:102 下載:4 |
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摘要
於高科技廠房中之精密機台基座底部增設滑磁隔震系統,在地震發生時可保護精密機台免於震害,平時亦可利用磁力吸固基座。本文即在探討無地震時以磁吸力固定基座,對其動態特性(如動態剛度、自振頻率及阻尼比)之影響。因此本研究規劃了鋼柱試驗及基座試驗,討論試體以磁力固定時之動力行為,並以電腦模擬試圖找出可模擬磁力之元件,預測試體以磁力固定之動力行為。
研究成果如下:
1.鋼柱試驗中,以八組800kgf吸力之磁力裝置做為固定機制時,其系
統剛度保有以螺栓固鎖之80%,但阻尼比提升約30倍。
2.基座試驗中,以八組磁力裝置固定時,水平向之動態剛度較基座未
固定時,於長向及短向分別提升5.2倍及2.4倍。
3.基座以磁力固定時,水平向自振頻率較未固定時提升,其與非位於
振動中心軸上之開磁磁力裝置距離系統中心軸之最遠距離有關。
4.基座試體以八組開磁磁力裝置固定時,其三向之阻尼比約為5%。
5.以linear spring分別模擬垂直及平行振動方向之開磁磁力裝置,
其勁度設定值分別為83000N/cm、111000N/cm;以friction
isolator模擬未開磁之磁力裝置,其勁度設定值為55000N/cm。
6.以磁力模擬元件配合本文之模擬勁度修正公式,並帶入基座之基本
資料即可用以預測基座以磁力固定時之動態剛度。
Abstract
Precision machinery foundation in the Hi-Tech factory building made of the sliding magnet isolator (SMI), can protect the precision machinery from the earthquake damage, and the foundation can also be fastened by magnetic force during daily operation. This research investigates the behavior of foundation fastened by magnetic force, which influence to its dynamic characteristics, such as dynamic stiffness, system frequency and damping ratio.
This research was planned to test in the steel column and the simulated machine foundation, to discuss the dynamic behaviors when the specimen is fastened by magnetic force, and try to find out the elements simulating the magnetic force by the simulation of computer, and to predict the dynamic behaviors of the specimen fastened by magnetic force.
This research has obtained following conclusions:
1.In the test of steel column, while regarding eight groups
of magnetic force devices, each provides 800kgf of
magnetic force as the fixed mechanism. It still maintains
80% stiffness compare to that fixed by bolts, but the
damping ratio increases about 30 times.
2.In the foundation test, when the foundation is fastened
by eight groups of magnetic force devices, the horizontal
dynamic stiffness increases 5.2 times and 2.4 times in
longitudinal and transversal directions, respectively,
compared to that not fastened.
3.When the foundation is fastened by magnetic force, the
horizontal frequency of the foundation increases compared
to that not fastened. The increment is influenced by the
farthest distance from the system central line to the
power-on magnetic device that is not placed on the
vibration central axis.
4.When the foundation is fastened by eight groups of
power-on magnetic devices, the tri-axes damping ratio are
about 5%.
5.The power-on magnetic devices of vertical and parallel
vibration direction are simulated with linear spring
elements of which the stiffness are 83000 N/cm and 111000
N/cm, respectively. The power-off magnetic device is
simulated by friction isolator elements of which the
stiffness is 55000 N/cm.
6.For a foundation with the basic data specified, using the
magnetic simulation elements and cooperating with the
revision formula of stiffness proposed in this study can
predict the dynamic stiffness of the foundation fastened
by magnetic force.
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