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研究生:顏至鴻
研究生(外文):Chih-Hung Yen
論文名稱:以船體動態反應預估遭遇海況之研究
論文名稱(外文):The Prediction of the Encountered Sea State Based on the Ship Dynamic Responses
指導教授:方銘川方銘川引用關係
指導教授(外文):Ming-Chung Fang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:系統及船舶機電工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:93
中文關鍵詞:船體運動遭遇海況海況推估海況監控輔助系統波浪負荷
外文關鍵詞:wave loadsship motionsencountered sea statesea state monitoring systemsea state estimation
相關次數:
  • 被引用被引用:7
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  • 下載下載:40
  • 收藏至我的研究室書目清單書目收藏:0
為了降低船舶以及船上人員在惡劣海況下的危險,本研究開發出一套船舶海況監控輔助系統,協助操船者對遭遇海況的了解,並給予最佳操船建議,以利操船者根據此結果適時改變操船方式,提高人員、貨物及船體的安全以及乘客的舒適感。
本文利用波浪造成之船體運動反應及波浪負荷,推估波高、平均週期和主波波向角等波浪參數。以頻率領域船體運動程式模擬船舶在不同船速、波高及平均週期的海況下之全航向船體運動及波浪負荷,透過ITTC能量波譜模型獲得在不規則波下各物理量之有義值(Significant Value),並建立資料庫,作海況推估之需。
為了驗證本文方法之可行性,另外使用時程領域船體運動程式,模擬一段時間之船體運動反應和波浪負荷,以此結果逐一與資料庫內各海況下之船體運動反應和波浪負荷相比較,推估出即時的波高、平均週期和主波波向角作測試與驗證。並根據推估之海況,搜尋最佳的船速、航向之操船組合。
In the paper, a sea state monitoring system on board is developed to assist the ship operator to understand the encountered sea state. It also provides the optimal operational directions to enhance the safety of the ship.
The ship motion responses and wave loads, i.e. heave, pitch, roll, vertical acceleration, vertical shear force and vertical bending moment, are adopted as the parameters to estimate the ship encountered sea state including the wave height, average period and wave direction. By using the frequency domain technique, we calculate a series of ship motions and wave loads with respect to different ship speeds, wave heights, average periods and wave directions. Then, based on the significant values through ITTC spectrum, the calculated results are established as the data base to estimate the encountered sea state for the ship.
In addition, the time domain technique is also applied to simulate ship motions and wave loads in order to verify the validity of the present technique. From the comparisons, we find that the sea state monitoring system developed here can work well and the optimal operation speeds and headings can also be suggested for reference.
摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 X
符號說明 XIII
第一章 緒論 1
1-1 研究背景 1
1-2 研究方法 2
1-3 文獻回顧 3
第二章 數學模式 7
2-1 參考座標系 7
2-2 基本假設與邊界條件 8
2-3 運動方程式 10
2-4 波浪負荷 11
2-5 相對運動 12
2-6 有義值之模擬 13
2-7 時程領域運動方程式 14
2-7.1 參考座標系 14
2-7.2 運動方程式 15
2-8 短峰波下動態船體運動反應之模擬 17
2-9 短峰波下動態波浪負荷之模擬 17
第三章 推估遭遇海況及輔助操船 19
3-1 推估遭遇海況 19
3-2 相對誤差 20
3-3 輔助操船 21
3-4 硬體架構 21
3-5 運動感測器及應變規之配置 23
第四章 結果與討論 24
4-1 計算船型 25
4-2 調整權重對於推估結果之影響 26
4-3 以不同參數組合對推估海況的準確性之影響 27
4-3.1 波高 28
4-3.2 平均週期 28
4-3.3 主波波向角 29
4-4 結果推估選取方式之影響 30
4-5 最佳化操船模擬 32
第五章 結論與未來展望 35
5-1 結論 35
5-2 未來展望 35
參考文獻 37
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