浮式結構物在海洋工程上被應用的相當廣泛，如用於海岸保護的消坡設施、開採海洋資源的海上平台、海上箱網養殖平台等，如何建造穩定的浮式結構物來擷取海洋資源，一直是海洋工程界關心的議題，在本研究中探討在浮式平台上裝載一具調諧液柱阻尼器(Tuned Liquid Column Damper；TLCD)後，浮台遭受到波浪作用後的運動特性及TLCD管內水位的變化特性。
本數值模式以勢能理論為基礎，採用邊界元素法發展二維非線性數值水槽，模擬裝載TLCD之浮式平台在波浪場中的動力特性，並於造波水槽內進行水工模型實驗，以實驗結果來驗證數值模式的正確性。
實驗結果發現，當波浪頻率與TLCD液柱的自然頻率接近時，TLCD管內液柱會大幅的上升，而且會抑制surge及pitch的運動，而TLCD對heave運動的影響較不明顯。數值模式與實驗結果比較顯示，在共振頻率附近，受到黏性效應的影響，數值模式會有高估的現象而且容易造成數值發散，為了降低黏性效應的影響，在數值模式中加入非耦合的阻尼係數矩陣，其結果發現當阻尼比ζ=0.06時，在共振頻率附近的運動反應有明顯的下降，使得數值計算整體的趨勢與實驗結果更為吻合。至於 TLCD水位震盪方面，研究結果發現，當有效液柱長(Le)增加會使得共振頻率的位置朝低頻處移動，當水平液柱長b越短、垂直液柱高hv越高、垂直及水平管口寬(Av和Ah)越窄及管口水平垂直截面積比(Ar=Av/Ah)越小都能夠有效的使水位振幅比(A2/A1)的峰值上升。

Floating structures are widely used in marine engineering, for example, wave absorption facilities for the protection of the coast, offshore platforms for the exploitation of marine resources, the sea cages platform for aquaculture. How to design stable floating structures to capture marine energy has become one of the main interests in ocean engineering. This study is to investigate the liquid oscillatory phenomenon inside the tuned liquid column damper (TLCD) and the dynamic behaviors of its floating platform under regular waves conditions.
The nonlinear numerical wave tank, developed based on the velocity potential function and the boundary element method (BEM), is used to simulate dynamic properties including surge, heave, pitch, and tension responses. In addition, a physical model of the floating platform with a TLCD was tested in a hydrodynamic wave tank to validate a 2-D numerical model for simulation of wave- structure interaction.
The experimental results indicate that when the incident wave frequency near the natural frequency of the TLCD, fluid in the TLCD column would oscillate vigorously but other motions such as surge, pitch and heave will be suppressed. The comparisons of numerical simulations and experimental data indicate that the numerical predictions are larger than measurements especially at frequencies near to the resonant frequency. This discrepancy is probably due to the fluid viscous effect. To overcome this problem, an uncoupled damping ratio (ζ) is adopted and incorporated into the vibration system. The results showed that when damping ratio ζ=0.06 the responses of body motion near the resonant frequency have significantly reduced and matched to the measurements. The results of the liquid column oscillation in TLCD reveal that the increase of effective length of liquid column (Le), the resonant frequency of TLCD would move downward. The peak value of the amplitude ratio (A2/A1) would increase as the length of the horizontal column (b), the cross-sectional area of the vertical column (Av), the cross-sectional area of the horizontal column (Ah), and the ratio of the cross-sectional areas (Av/ Ah) were reduced.

誌謝 i
中文摘要 ii
Abstract iii
目錄 v
表目錄 viii
圖目錄 ix
符號對照表 xiii
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1 繫纜式浮式結構物 2
1.2.2 數值水槽 3
1.2.3 TLCD之研究 3
1.2.4 水工模型實驗之研究 5
1.3 研究目的 5
1.4 研究方法 5
1.5 文章架構 6
第二章 理論基礎 7
2.1 二維數值水槽 7
2.1.1控制方程式 8
2.1.2邊界積分方程式 8
2.2 邊界條件 9
2.2.1造波邊界 9
2.2.2 Ω1自由液面邊界 10
2.2.3數值消波區 11
2.2.4直立壁及底床邊界 12
2.2.5浮式平台結構物邊界條件 12
2.2.6 TLDC水槽結構物邊界條件 13
2.2.7 Ω2自由液面邊界 13
2.3 結構物外力計算 13
2.4 模態分解法 14
2.5 錨碇系統 18
2.6 含阻尼效應的自由振動系統 19
2.7 數值模式流程 20
第三章 水工模型實驗 22
3.1 實驗目的 22
3.2 實驗規劃 22
3.2.1 實驗模型尺寸及材質 22
3.2.2 實驗儀器與設備 24
3.2.3 量測項目 29
3.2.4 實驗佈置 30
3.2.5 水工模型實驗實驗步驟 30
3.2.6 TLCD液柱自然頻率測量 32
3.2.7實驗波浪設計條件 32
3.3 分析方法 33
3.3.1 水位分析 33
3.3.2 張力分析 34
3.3.3 平台剛體運動分析 34
3.3.4 TLCD自然頻率分析 36
第四章 結果與討論 38
4.1 實驗結果與數值模式之比較 38
4.2 數值模式的應用 43
4.2.1改變入射波波高(HI)的影響 43
4.2.2 改變TLCD尺寸的影響 47
4.2.2.1 改變TLCD垂直液柱高hv的影響 48
4.2.2.2改變TLCD水平液柱長b的影響 52
4.2.2.3 TLCD有效液柱長Le不變，改變hv及b的影響 56
4.2.2.4同時改變TLCD的Av及Ah的影響 60
4.2.2.5僅改變垂直管口寬Av的影響 64
4.2.2.6 僅改變水平管口寬Ah的影響 68
4.2.3改變浮台寬度L1的影響 72
4.2.4改變浮台錨碇角度θ0的影響 75
第五章 結論與建議 78
5.1結論 78
5.2建議 79
參考文獻 81
附錄A 結構物運動及邊界條件 84
附錄B 數值方法 90
附錄C 影像處理 94
附錄D 反射率計算 103
附錄E 質量慣性矩 105
附錄F U型管液柱運動方程式 108
附錄G TLCD水槽內液體的影響 110

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