Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1880
標題: 火力電廠雙併式鋼管煙囪結構振動之研究
Studies of the Vibration of the Twin Steel Stacks in Thermal Power Plants
作者: 黃達義
Huang, Dar-Yih
關鍵字: 
出版社: 機械工程學系
摘要: 
本文主要內容係使用近似解法分析雙併式高鋼管煙囪動態響應,並暸解此類高煙囪鋼管結構中各處拉桿勁度及阻尼對於結構自然頻率與振動響應的影響,以便日後作為設計煙囪固定拉桿尺寸及配置位置,或加裝阻尼器,來降低煙囪結構之振幅響應的參考。
文中採用拉格蘭治方程式配合假設模態法推導系統運動方程式,所求出煙囪結構之自然頻率,除與ANSYS軟體分析的結果比較外,並和實地實驗結果[10]對照,驗證本文所建立模式的準確性。
最後利用所建立之模式,分析各拉桿勁度對結構之自然頻率改變的影響,並探討各處拉桿勁度及阻尼係數等在結構受到地震激振時的振動響應,本文之研究應可作為改善此類雙併式煙囪結構之參考。

The analytical approximate method is applied to analyze dynamic parameters of high twin steel of the tie bars stacks. The aim is to study the effects of the stiffness and dampers connecting the twin steel stacks on the natural frequencies and dynamic responses of the structure. The findings may be served as a reference guide for designing the tie-bars or installing dampers to control the vibration of the stacks.
The Lagrange's equation in conjunction with the assumed modes method is used to obtain the equations of motion of the system. In order to verify the present model, the results are compared with those obtained using ANSYS, a commercial finite element software, and with the experimental results in Ref [10].
Finally, by employing the present model, the natural frequencies of the systems due to variation of the stiffness of the tie-bars are studied. Then the influence of the stiffness of tie-bars as well as the damping coefficients of viscous dampers on the dynamic responses of the twin-stacks structure subjected to the earthquake excitation is investigated. The results can be a useful reference for further modification of the twin-stacks structure.
URI: http://hdl.handle.net/11455/1880
Appears in Collections:機械工程學系所

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