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系統識別號 U0002-1708200513515100
中文論文名稱 二維方柱橫向與扭轉向振動耦合之氣動力研究
英文論文名稱 Aerodynamic forces of a square prism in transverse and torsional coupled motion
校院名稱 淡江大學
系所名稱(中) 水資源及環境工程學系碩士班
系所名稱(英) Department of Water Resources and Environmental Engineering
學年度 93
學期 2
出版年 94
研究生中文姓名 呂宜靜
研究生英文姓名 Yi-Ching Lu
學號 692330631
學位類別 碩士
語文別 中文
口試日期 2005-07-22
論文頁數 83頁
口試委員 指導教授-盧博堅
委員-鄭啟明
委員-陳若華
中文關鍵字 二維方柱  強制振動  頻率比  偏心量 
英文關鍵字 A square prism  forced vibration  ratio of frequency  eccentricity 
學科別分類 學科別應用科學環境工程
中文摘要 本研究將探討一二維方柱體在受強制振動影響下,改變其橫風向與扭轉向振動間的頻率比及二維方柱之偏心量,進而瞭解橫風向與扭轉向振動間發生耦合時,結構物所產生之氣動力現象。
結果顯示,當Fr大於1.0時,在勁度中心往上游偏離,偏心量為10%時可得最小的擾動昇力係數峰值及渦散頻率的尾跡風速;而在勁度中心往上游偏離,偏心量為20%可得最大的擾動昇力係數峰值及渦散頻率的尾跡風速。當Fr等於1.0時,在勁度中心往上游偏離,偏心量為10%時可得最大的擾動昇力係數峰值及渦散頻率的尾跡風速;而在勁度中心往上游偏離,偏心量為20%可得最小的擾動昇力係數峰值及渦散頻率的尾跡風速。與Fr大於1.0正好相反。當Fr小於1.0時,在勁度中心無偏離時,可得最大的擾動昇力係數峰值及渦散頻率的尾跡風速;而最小值則不一定發生在哪一個偏心上。
英文摘要 Wind tunnel measurements were performed to study the aerodynamic
phenomenon of a two dimensional prism when the mass center separates from the center in transverse and torsional coupled vibration modes.

When the torsion/transverse frequency ratio (Fr) is greater than 1.0, as long as the eccentricity is introduced in the upstream direction at 10%, the spectral peaks of the lift fluctuation coefficient and the vortex shedding reach a minimum value compared with other eccentricities. However, as the eccentricity increases to 20%, the spectral peaks reach a maximum value.

Whereas when Fr=1, eccentricity 10% and 20% in the upstream direction, the spectral peaks of lift fluctuation coefficient and vortex shedding show the opposite trend. A maximum value is obtained when Fr is smaller than 1.0 and without eccentricity. However, there is no obvious trend for the minimum value.
論文目次 摘要
目錄 Ⅰ
圖目錄 Ⅳ


第一章 緒論
1-1 前言……………………………………………………...…1
1-2 研究動機………………………………………………..….1
1-3 研究方法與內容……………………………………………2

第二章 文獻回顧
2-1 結構物振動…………………………………………….…….4
2-2 橫風向振動…………………………………………………..5
2-2-1 橫風向振動對壓力係數的影響……………………..…...6
2-2-2 橫風向振動對尾跡反應的影響……………….………....9
2-3 扭轉向振動.…………………………………….……….…..10
2-4 壓力之量測..…………………………………………....…..14
2-5 尾跡之量測…………………………………………..…..…14
第三章 理論背景介紹
3-1 風對結構物之作用……………………………………....…..16
3-1-1分離 (separation)…………………………………………..16
3-1-2再接觸現象(reattachment)…………………………………16
3-1-3 尾跡(wake)………………………………………………..17
3-1-4 渦散作用(vortex shedding)……………………………….17
3-1-5 鎖定現象(lock-in)…………………………………………18
3-2 端板效應(end plate effect)…………………….….………….19
3-3 阻塞比效應(blockage ratio effect)………………………..….20
3-4 雷諾數效應(Reynolds number effect)…...……………….….20
3-5 均勻紊流場(homogeneous turbulence flow)………....…..….21
3-5-1 紊流強度(turbulence intensity)……………………………21
3-6 風力係數(wind coefficient)…………………………………..23
3-7 數位訊號之處理與分析技巧………………………………..25
3-8 散漫數據分析(random data analysis)………………………..26
第四章 結果與討論
4-1 風洞簡介…………………………………………………….29
4-2 結構之模擬…………………………………….……………29
4-2-1 結構物外型設計………………………………................29
4-2-2 結構物偏心…………………………..…………………..29
4-3 實驗設置……………………………....................................30
4-3-1 實驗參數……...................................................................30
4-3-2 實驗種類包括……….…………………………………..31
4-4 實驗設備……………………………………………………32
4-4-1 強制振動扭轉基台…..………………………………….32
4-4-2 流場風速量測設置……………………………………..32
4-4-3 模型壓力量測設置……………………………………..33
4-4-4 尾跡風速的量測………………………………………...34
4-5 率定與校正…..……………………………………………..34
4-5-1 TSI定溫式熱膜探針之率定……………..…….………34
4-5-2 壓力轉換器之率定.…………………..…………………35
4-5-3 管線系統訊號之校正……….....………………………..35
4-6 位移反應量測與率定………................................................37
4-6-1結構位移之量測………………………………………….37
4-6-2位移率定………………………………………………….38
第五章 結果與討論
5-1 實驗種類…………………………………..…….…………39
5-2 實驗參數………………………………………………..….39
5-3 擾動昇力係數的實驗結果…………………………………40
5-4 尾跡反應的實驗結果……………………………………….46
5-5 討論………………………………………………………….51
第六章 結論

參考文獻……………………………………………………………......54









圖 目 錄
圖4-1淡江大學風洞實驗室配置圖……………………………………61
圖4-2昇力模型壓力孔位置示意圖.....………………………………..62
圖4-3模型偏心示意圖…………………….…………………………..63
圖4-4二軸平台之馬達…………………………………………………64
圖4-5振動平台架設圖………………….……………………………..64
圖4-6皮拖管………….………………………………………………..65
圖4-7昇力量測流程圖…………………………………………………66
圖4-8探針之架設………………………………………………………67
圖4-9 IFA-100智慧型流速儀…………………………………………67
圖4-10管線系統校正流程圖…………………………………………..68
圖4-11實驗採樣分析流程圖…………………………………………..69
圖4-12 Labview儀控程式……………………………………………..70
圖4-13 Labview取值程式……………………………………………70
圖5-1方柱模型在耦合實驗中當F=1.2時,各順風向偏心量之擾動昇力係數尖峰值…………………………………………………71
圖5-2方柱模型在耦合實驗中當F=1.1時,各順風向偏心量之擾動昇力係數尖峰值………………………………………………….71
圖5-3方柱模型在耦合實驗中當F=1.0時,各順風向偏心量之擾動昇
力係數尖峰值……….……………………………………….72
圖5-4方柱模型在耦合實驗中當F=0.9時,各順風向偏心量之擾動昇力係數尖峰值………………………………………………..72
圖5-5方柱模型在耦合實驗中當F=0.8時,各順風向偏心量之擾動昇力係數尖峰值…………………………………………………73
圖5-6方柱模型在耦合實驗中當Ex=20%時,各順風向偏心量之擾動昇力係數尖峰值…………………………………………………74
圖5-7方柱模型在耦合實驗中當Ex=10%時,各順風向偏心量之擾動昇力係數尖峰值…………………………………………………74
圖5-8方柱模型在耦合實驗中當Ex=20%時,各順風向偏心量之擾動昇力係數尖峰值…………………………………………………75
圖5-9方柱模型在耦合實驗中當Ex=-10%時,各順風向偏心量之擾動昇力係數尖峰值………………………………………………75
圖5-10方柱模型在耦合實驗中當Ex=-20%時,各順風向偏心量之擾動昇力係數尖峰值……………………………………………..76
圖5-11方柱模型在各順風向偏心量,不同頻率比共振點之擾動昇力係數尖峰值…………………………………………………..77
圖5-12方柱模型在耦合實驗中當F=1.2時,各順風向偏心量之尾跡風速尖峰值………………………………………………….78
圖5-13方柱模型在耦合實驗中當F=1.1時,各順風向偏心量之尾跡風速尖峰值……………………………………………………78
圖5-14方柱模型在耦合實驗中當F=1.0時,各順風向偏心量之尾跡風速尖峰值……………………………………………………….79
圖5-15方柱模型在耦合實驗中當F=0.9時,各順風向偏心量之尾跡風速尖峰值………………………………………………………79
圖5-16方柱模型在耦合實驗中當F=0.8時,各順風向偏心量之尾跡風速尖峰值………………………………………………………80
圖5-17方柱模型在耦合實驗中當Ex=20%時,各順風向偏心量之尾跡風速尖峰值……………………………………………………81
圖5-18方柱模型在耦合實驗中當Ex=10%時,各順風向偏心量之尾跡風速尖峰值……………………………………………………81
圖5-19方柱模型在耦合實驗中當Ex=0%時,各順風向偏心量之尾跡風速尖峰值………………………………………………………82
圖5-20方柱模型在耦合實驗中當Ex=-10%時,各順風向偏心量之尾跡風速尖峰值……………………………………………………82
圖5-21方柱模型在耦合實驗中當Ex=-20%時,各順風向偏心量之尾跡風速尖峰值……………………………………………………83
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