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Research of springing and Whipping Influence on Ultra-Large Containerships' Fatigue Analysis

Journal of Shanghai Jiaotong university(Science) 2018年第3期23卷 429-437页

作者：任慧龙张楷弘李辉 College of Shipbuilding Engineering Harbin Engineering University

Rules of Classification Societies all around the world have made changes on design wave loads' value and fatigue influence factor modification due to the influence of springing and whipping on ultra-large containerships.The paper firstly introduced 3-D linear hydroelastic theory in frequency domain and 3-D nonlinear hydroelastic theory in time domain, considering large amplitude motion nonlinearity and slamming force due to the severe relative motion between ship hull and wave. Then the spectrum analysis method and time domain statistical analysis method were introduced, which can make fatigue analysis under a series of standard steps in frequency and time domain, respectively. Finally, discussions on the influence factor of springing and whipping on fatigue damages of 8500 TEU and 10000 TEU containerships with different loading states were made. The fatigue assessment of different position on the midship section was done on the basis of nominal stress. The fatigue damage due to whipping can be the same as the fatigue damage due to springing and even sometimes can be larger than the springing damage. Besides, some suggestions on calculating load case selection were made to minimize the quantity of work in frequency and time domain. Thus, tools for fatigue influence factor modification were provided to meet the demand of IACS-UR.

关键词： springing whipping fatigue analysis hydroelasticity

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Theory and applications of coupled fluid-structure interactions of ships in waves and ocean acoustic environment

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Journal of Hydrodynamics 2016年第6期28卷 923-936页

作者：吴有生邹明松田超司马灿祁立波丁军李志伟陆晔 China Ship Scientific Research Center Wuxi 214082 China

Wave induced motions and structural distortions, and machinery or propeller excited vibrations and acoustic radiations of a ship are two kinds of important fluid-structure interaction problems. The branch of ship science that describes the coupled wave induced dynamic behavior of fluid-structure interaction system is referred to as hydroelasticity. During the past three decades the development of three-dimensional hydroelasticity theories and applications gained great progress. Recently the 3-D hydroelasticity theory was further extended to account for the fluid compressibility and the effect of the ocean acoustic environment with finite water depth. A three-dimensional sono-elasticity theory was then produced. In this paper, the 3-D hydroelasticity theory and the 3-D sono-elasticity theory of ships are briefly described. To illustrate the applicability and feasibility of these theories and the corre- sponding numerical approaches, several examples are presented including the predictions of wave loads, rigid-body and flexible- body responses, springing and fatigue behaviors, machinery or propeller excited coupled structural vibrations and acoustic radiations, as well as design optimizations for improving safety and acoustic behaviors of ships.

关键词： hydroelasticity sono-elasticity wave load structural strength springing vibration acoustic radiation

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深水中TLP及Spar的粘性阻尼

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中国造船 2006年第2期47卷 17-23页

作者：陶龙宾 School of Engineering Griffith University

对深水中TLP及Spar在发生高频垂向谐振“springing Vibration”时的水动力阻尼作了较为系统的研究与数值计算分析.计算结果表明：在本文所考虑的参数范围（KC=0.001～1.0,β=89236～435298）内,由于不同的形状阻尼特性,存在着两个不同... 详细信息

对深水中TLP及Spar在发生高频垂向谐振“springing Vibration”时的水动力阻尼作了较为系统的研究与数值计算分析.计算结果表明：在本文所考虑的参数范围（KC=0.001～1.0,β=89236～435298）内,由于不同的形状阻尼特性,存在着两个不同的线性和非线性阻尼区域.基于数值计算结果分析,导出了适用于上述两个区域的粘性阻尼计算公式.

关键词：船舶、舰船工程张力腿式平台(TLP) springing Vibration 水动力阻尼摩擦阻尼形状阻尼

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