臺灣博碩士論文加值系統

本文利用水彈性力學理論，以模態疊加法求解考慮波振效應之船體結構應力分佈，並求得船體於單位波高作用下之反應振幅運算子(Response Amplitude Operator, RAO)；利用頻譜疲勞分析法，針對選定熱點區域，探討波振效應對結構疲勞壽命之影響。
波振效應(Springing Effect)為當船舶航行時之波浪遭遇頻率接近船舶結構自然振動頻率時，船體結構與波浪交互作用之流固耦合現象。波振效應會對船體造成額外負荷，進而降低船舶之疲勞壽命。隨著貨櫃輪持續朝大型化發展及高張力鋼的大量使用，船舶結構自然振頻降低，與遭遇頻率重疊之機率上升，使波振效應成為探討大型船舶結構疲勞壽命之重要議題。
本文首先透過建立全船有限元素模型求解船體結構之自然振動模態及對應之模態振頻，並利用法國驗船協會開發之分析軟體以小板法進行水動力計算。針對台灣國際造船股份有限公司8,000 TEU貨櫃輪，首先建立兩種裝載狀況之全船有限元素結構模型、探討之熱點局部細網格模型及水動力網格模型，利用所建立之模型進行全船有限元素分析，配合局部細網格模型搭配熱點處所適用之應力評估法，選擇適當之應力，求解不同波高、波頻、航向角下結構熱點考慮波振之應力反應振幅運算子，與波浪頻度表(Wave Scatter Diagram)組合，配合適當之S-N Curve，以頻譜疲勞分析計算結構疲勞壽命，並探討波振效應之影響。
本文選定兩不同形式之熱點進行分析，針對選定之兩種裝載狀況、分別就兩種船速假定進行計算，最後以兩種不同波浪頻度表進行頻譜疲勞分析，探討不同環境設定下波振效應之影響。

This study employs modal superposition method to conduct hydro-elastics analysis, and evaluates stress distribution on ship structure considering springing effect. With the calculated stress response amplitude operators (RAO), spectral fatigue analysis (SFA) is used to obtain the fatigue life of hot spot on ship structure.
Springing effect is the phenomenon of ship hull structure resonance induced by wave load, which will cause extra cyclic loads on ship structure, therefore, fatigue life of ship would be decreased. The natural frequency of ship structure becomes lower while the size of container vessel growing larger and the widely use of high tensile steels are applied considerably, thus it is more probable to have the encounter frequency of wave loads approaching the natural frequency of ship hull structure, which makes springing an important subject in large container vessel design.
This study considered the CSBC’s 8,000TEU container vessel with two different loading conditions. A spectral approach using hydroelastic software Homer and Springing tools which contributed by Bureau Veritas has been used to evaluate the springing effect. To perform spectral fatigue analysis, the stress RAOs of hot spot which obtained by FE analyses were further combined with the wave scatter diagram. Two hotspot positions were chosen to compare their fatigue lives with/without springing effect. In the spectral fatigue analyses, two different wave scatter diagrams and two ship speeds were also considered as parameters in order to compare springing effects under different operating conditions.

誌謝 I
中文摘要 II
Abstract III
目錄 IV
圖目錄 VII
表目錄 X
符號表 XII
第一章 緒　論 1
1-1 研究動機 1
1-2 文獻回顧 1
1-3 論文架構 3
第二章 船舶水動力之探討方法 4
2-1 擬靜態之水動力分析 4
2-1-1 擬靜態分析理論 4
2-1-2 邊界值問題求解 6
2-2 線性水彈性力學之水動力分析 8
2-2-1 線性水彈性力學之結構反應 9
2-2-2 水動力分析 10
2-3 水動力分析之計算流程與分析工具 18
第三章 船體結構疲勞強度之探討方法 20
3-1 疲勞壽命預估方法 20
3-1-1 簡易計算法 20
3-1-2 正規頻譜疲勞分析法 20
3-2 應力評估 21
3-2-1 公稱應力(Nominal Stress) 22
3-2-2 熱點應力(Hot Spot Stress) 22
3-3 缺口應力(Notch Stress) 29
3-4 S-N Curve 31
3-4-1 S-N Curve選擇 33
3-4-2 船級規範之比較 35
3-5 疲勞壽命評估 42
3-5-1 頻譜疲勞分析法(SFA) 42
3-5-2 機率密度與分佈 42
3-5-3 海況統計 44
3-5-4 短期評估 47
3-5-5 長期評估 48
第四章 實例分析 50
4-1 基本資訊 50
4-1-1 參考船資料 50
4-1-2 環境參數設定 51
4-2 分析模型 54
4-2-1 結構模型 54
4-2-2 積分模型 56
4-2-3 水動力模型 57
4-3 實例分析 60
4-3-1 擬靜態分析 60
4-3-2 線性水彈性力學分析 74
4-3-3 頻譜疲勞分析 78
4-3-4 波振效應探討 83
4-3-5 局部結構設計之探討 88
第五章 結論 91
5-1 研究結論 91
5-2 未來展望 92
參考文獻 94

1.吳政緯, 水彈性力學分析貨櫃輪之疲勞強度. 台灣大學工程科學及海洋工程研究所碩士論文, 2013.
2.Heller S. R. and Abramson H. N., Hydroelasticity：A new naval science[J]. Journal of American Society of Naval Engineers, 1959(71(2)): p. 205-209.
3.Bishop, R.E.D. and W.G. Price, Hydroelasticity of ships. 1979, Cambridge Eng. ; New York: Cambridge University Press. ix, 423 p.
4.Bishop, R.E.D., W.G. Price, and Y.S. Wu, A General Linear Hydroelasticity Theory of Floating Structures Moving in a Seaway. Philosophical Transactions of the Royal Society a-Mathematical Physical and Engineering Sciences, 1986. 316(1538): p. 375-426.
5.Bishop, R.E.D.a.W.G.P., Hydroelasticity of Ship. 1979: Cambridge University Press.
6.Hirdaris, S.E., W.G. Price, and P. Temarel, Two- and three-dimensional hydroelastic modelling of a bulker in regular waves. Marine Structures, 2003. 16(8): p. 627-658.
7.Wu, M.K. and T. Moan, Linear and nonlinear hydroelastic analysis of high-speed vessels. Journal of Ship Research, 1996. 40(2): p. 149-163.
8.Xia, J.Z. and Z.H. Wang, Time-domain hydroelasticity theory of ships responding to waves. Journal of Ship Research, 1997. 41(4): p. 286-300.
9.Jensen, J.J.a.Z.W., Wave Induced Hydroelastic Response of High Speed Monohull Displacement Ship, in 2nd Int. Conf. on Hydroelasticity1999: Fukuoka, Japan.
10.Rao, T.V.S.R.A., Iyer, N. R., Rajasankar, J. and Palani G. S., Dynamic response analysis of ship hull structures. Marine Technology and Sname News, 2000. 37(3): p. 117-128.
11.Chen, X.B., B. Molin and F. Petitjean,, Numerical evaluation of the springing loads on tension leg platforms. Marine Structures, 1995(8): p. 501-524.
12.S Malenica, J.T., F Bigot and FX Sireta, Some aspects of 3D linear hydroelastic models of springing, in International Conference on Hydrodynamics2008: Nantes.
13.Senjanovic, I., S. Malenica, and S. Tomasevic, Investigation of ship hydroelasticity. Ocean Engineering 35, 2008a: p. 523-535.
14.田超，&;#21556;有生, 船舶水行性力&;#23398;理&;#35770;的研究&;#36827;展. 2008, 上海: 上海交通大&;#23398;船舶海洋与建筑工程&;#23398;院.
15.第216研究協會, 大型船縱向骨材強度之研究成果報告書. 財團法人日本造船研究協會, 平成6年3月.
16.Bureau Veritas, Manual of Starspec. 2010.
17.凌志榮, 雙層船殼超大型油輪之疲勞強度分析. 台灣大學造船及海洋工程研究所碩士論文, 民國88年.
18.張志鴻, 對接焊道缺陷之散裝貨輪疲勞強度研究. 台灣大學造船及海洋工程研究所碩士論文, 民國90年.
19.劉仲益, 貨櫃船疲勞壽命強度之探討. 台灣大學造船及海洋工程研究所碩士論文, 民國84年.
20.廖飛揚, 貨櫃船疲勞壽命預估方法之探討. 台灣大學造船及海洋工程研究所碩士論文, 民國84年.
21.謝靜如, 以共同結構規範分析雙層船殼油輪疲勞強度之研究. 台灣大學工程科學及海洋工程研究所碩士論文, 民國99年.
22.蔡思潔, 考慮水彈性效應之散裝貨輪頻譜疲勞分析. 台灣大學工程科學及海洋工程研究所碩士論文, 2012.
23.Moskowitz, L., Estimates of the powe of spectrums for fully developed seas for wind speeds of 20 to 40 knots. J. Geophys.Res.,69,5161-5179, 1964.
24.Pierson, T.J., The interpretation of wave spectrum in terms of the wind pro&;#64257;le instead of the wind measured at a constant height. J. Geophys. Res., 69,5191–5203, 1964.
25.Bretschneider, C.L., Significant waves and wave spectrum, Ocean Industry. 1968.
26.Hasselmann, K., Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP). Erga&;#776;nzungsheft zur Deutschen hydrographischen Zeitschrift Reihe A (8&;#8304;), Nr 12. 1973, Hamburg,: Deutsches Hydrographisches Institut. 95 p.
27.Kukkanen, T. and T.P.J. Mikkola, Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad. Marine Structures, 2004. 17(1): p. 75-90.
28.IACS, Guidance &; recommendation REC_56-Fatigue assessment of ship structures. 1999.
29.Lotsberg, I. and G. Sigurdsson, Hot spot stress S-N curve for fatigue analysis of plated structures. Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme, 2006. 128(4): p. 330-336.
30.Hashin, Z., A cumulative damage theory of fatigue failure. Materials Science and Engineering, 1978. 34(2): p. 147-160.
31.Golos, K. and F. Ellyin, Generalization of Cumulative Damage Criterion to Multilevel Cyclic Loading. Theoretical and Applied Fracture Mechanics, 1987. 7(3): p. 169-176.
32.Kujawski, D. and F. Ellyin, A Cumulative Damage Theory for Fatigue Crack Initiation and Propagation. International Journal of Fatigue, 1984. 6(2): p. 83-88.
33.Mathieu RENAUD, E.D.L., Jean-Baotiste BOUTILLIER, Ludovic GERARD. Fatigue and weather on ultra large ContainerShips. in 12th International Symposium on Practical Design of Ships and Other Floating Structures,PRADS. 2013. Cangwon, Korea.
34.J.B. Koo, et al., Fatigue Assessment of the 18,000TEU Container Vessel Considering the Effect of Springing, in International Society of Offshore and Polar Engineers (ISOPE)2013.
35.Owen F. Hughes, Ship Structural Design. SNAME, 1988.
36.Malenica, S., Hydro structure interactions in seakeeping. International Workshop on Coupled Methods in Numerical Dynamics, 2007.
37.O. M. Faltinsen, Sea Loads on Ships and Offshore Structures. Cambridge Ocean Technology. 1990: Cambridge University Press.
38.Salvesen, N., Tuck, E.O. and Faltinsen, O.,, Sea Motion and Sea Loads. Transaction, Vol. 70, SNAME, 1970: p. 150-287.
39.Chen, X.B. Approximation on the quadratic transfer function of low-frequency loads. in Proc. 7th Intl. Conf. Behaviour Offshore Structures. 1994.
40.Chen, X.B., Hydrodynamics in offshore and naval applications – Part I, in Keynote lecture of 6th Intl. Conf. Hydrodynamics2004: Perth ,Australia. p. 289-302.
41.IACS, Dynamic Response, in 16th International Ship and Offshore Structure Congress2006.
42.Storhaug, G., and E. Moe. Measurements of Wave induced Vibrations Onboard a Large Container Vessel Operating in Harsh Environment. in 10th international symposium on practical design of ships and other floating structures. 2007. Houston, US.
43.Tuitman, J.T.a.M., S.,, Fully coupled seakeeping, slamming, and whipping calculations. Proceedings of the Institution of Mechanical Engineerings, Part M: Journal of Engineering for the Maritime Environment, 2009.
44.Det Norske Veritas, Fatigue Assessment of Ship Structures. 2014.
45.IACS, Common Structural Rules for Bulk Carriers and Oil Tankers. 2013.
46.American Bureau of Shipping, Rules for building and classing: Steel Vessels. 2014.
47.Bureau Veritas, Rules for the Classification of Steel Ships. 2014.
48.American Bureau of Shipping, Guidance for Application of High-Strength Hull Structural Thick Steel Plates in Conainer Carriers. 2014.
49.Bureau Veritas, Guidline for Ultra Large Container Ships. 2010.
50.M.S. Longuet Higgins, On the statistical distribution of the heights of sea waves. Journal of Marine Research, 1952. 11: p. 245-266.
51.Hasselmann K. et al, Measurements of Wind-Wave Growth and Swell Decay during the Joint North Sea Wave Project (JON SWAP). 1973.