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標題: 可調式調諧質量阻尼器對機器運轉引致樓板振動之減振研究
A Study on Adjustable Tuned Mass Damper to Reduce Floor Vibration due to Machinery
作者: 張民岦
Chang, Min-Li
關鍵字: Tuned mass damper
Floor vibration
Full-Scale experiment
出版社: 土木工程學系所
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摘要: 本文研究TMD對降低機器產生之樓板振動,作最佳化設計。由於理論上,TMD在無阻尼的情況下,其TMD頻率調整至機器運轉頻率時有最佳之控制效果。考量現實環境下無法設計零阻尼的構件,且精確的結構模態參數及機器振動頻率不易取得,因此本文發展頻率可調整式之垂直向TMD(簡稱VTMD),及配合「現地設計」即可解決以上問題,獲得樓板裝設TMD之最佳減振效果。 本研究發展之可調整式VTMD,分別以更換規格化彈簧及改變質量來調整VTMD之頻率。而製造完成後之實體VTMD除在本校大型結構實驗室以簡支承鋼梁(3公尺長),作VTMD之功能測試外,並在兩座實尺寸建築物之樓板(鋼筋混泥土一般樓板及預鑄格子梁板)進行現地樓板振動試驗,經由實驗成果可驗證樓板裝設VTMD後具有減振效果;其中鋼筋混泥土樓板裝設VTMD之實驗,其樓板振動加速度可被降低超過40%,而在格子梁板裝設VTMD之實驗中,雖然VTMD之質量比非常小,其樓板振動加速度仍有17~23%之折減效果。 最後,本文以中部科學園區內某一高科技製造廠房為例,以數值驗證,設計採用本研究之VTMD作為樓版振動控制裝置。由廠房樓板裝設VTMD前後之反應結果得知,本文研究之VTMD確可應用於現有之高科技廠房樓板。
This study deals with the optimum design of a tuned mass damper (TMD) for mitigating machine-induced vertical vibration of structures. Theoretically, a TMD without damped tuning of the machine operating frequency provides the optimum control performance. Considering the fact that zero damping is impossible, and since there are many uncertainties in structural modal parameters and machinery excitation frequencies, this study proposes a new field-based design procedure and an adjustable vertically moving TMD (VTMD) to obtain the optimum vibration reduction. The proposed VTMD is made up of variable mass blocks and changeable commercial springs. A prototype of the VTMD was tested on a simply supported beam (3 m length) to investigate its characteristics in the Large-scale Structure Laboratory of National Chung Hsing University. Both of the Full-Scale building experimental results (one was the Full-scale RC school building floor, and the other was the Full-scale pre-cast RC waffle slab building) confirmed the effectiveness of the VTMD. The result of the floor test indicated a reduction in acceleration of more than 40 %. The result of the waffle slab test showed that a reduction in acceleration of 17-23 % can be achieved even though the mass ratio of VTMD to structure is very small. The last part of this study, the numerical results from floors equipped with a VTMD in a high-tech fabrication factory in Central Taiwan Science Park, shows that the proposed VTMD can be used as an effective control device to reduce floor vibrations in high-tech fabrication factories.
其他識別: U0005-1708200909290800
Appears in Collections:土木工程學系所



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