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11.
Hiroshi Isshiki 《Journal of Marine Science and Technology》2001,6(2):93-109
To discuss water-wave problems in unlimited waters, it is important to know what type of wave radiation condition should
be placed on a virtual surface corresponding to infinity. For this kind of problem, the Sommerfeld radiation condition is
well known. In this article, the condition is extended to treat a case with an incident wave. Furthermore, a more general
wave radiation condition is introduced from a different point of view. The above-mentioned wave radiation conditions are introduced
into the variational principles of the Kelvin, Hellinnger–Reissner, and Dirichlet type. The Dirichlet-type variational principles
are then used in numerical calculations for bending waves in a bar, and the effectiveness of the wave radiation conditions
and the variational principles is shown. The numerical results for one-dimensional water-wave problems are then given. As
expected, the region required for the numerical solution is reduced drastically compared with that required by the Sommerfeld-type
formulation. Furthermore, the amplitude of the diverging wave is obtained in the process of reaching the variational solution.
Finally, two-dimensional water-wave problems are briefly discussed.
Received: August 9, 2001 / Accepted: September 17, 2001 相似文献
12.
The Powell's method was developed to determine the optimal stiffness and damping of multi-tuned mass dampers (MTMD) in offshore wind turbine (OWT) support structures under fatigue loads. Numerical examples indicated that the Powell's method results are always better than those using MTMD formulations. With the exception of the blade passing (3P) frequency, it was found in this work that a positive integer (n) multiple of the 3P frequency will also result in a large wind-induced vibration, which can be excited by the frequency of the first structural vertical rotation mode and will cause significant fatigue damage. The first translation mode TMD installed at the tower top is efficient to increase fatigue life at the tower and brace connections, but it cannot reduce fatigue damage at the column and brace connections below the platform. The second translation mode TMD can reduce fatigue damage resulting from large wave loads and thus increase the fatigue life of the braces and columns. The mode-3 TMD with a reduction in the 3(3P) vertical rotation can effectively increase the fatigue life of the braces and columns. Thus, the appropriate use of these TMDs can be effective for the fatigue problem of OWT support structures. 相似文献
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本文简要阐述了影响船舶总纵强度的主要因素,并对《钢质内河船舶建造规范》(2009)中将船舯剖面处的最小剖面模数表示成型深D的表达形式提出了自己的见解,并指出了总纵弯矩与中剖面最小剖面模数计算公式中的不协调。 相似文献
15.
Roberto?MuscariEmail author Andrea Di?Mascio 《Journal of Marine Science and Technology》2003,8(2):61-67
A numerical model for the simulation of two dimensional spilling breaking waves is described. It is derived from a previous model which, in turn, takes its underlying ideas from the Cointe and Tulin theory of steady breakers. With respect to the former model, the present one is local, i.e., the inception, extension, and geometry of the breakers are determined through the local shape of the water surface. The model has been implemented in a RANSE code, which was developed for the simulation of ship flows, through a modification in the boundary conditions. This yields a simple and effective way to reproduce the breakers influence on the underlying flow. The resulting code has been used to simulate the flow past a submerged hydrofoil. The numerical results are compared with those of the previous model and with the experimental data obtained by Duncan. 相似文献
16.
对船舶,特别是超规范船舶,进行结构的直接计算设计时,首先要知道波浪弯矩设计值。 要确切地做到这一点,设计人员应合理地选择船舶航行海域的海浪长期统计资料,然后根据船 舶的装载工况和实际可能达到的航速,借用线性理论或非线性理论进行波浪弯矩的长期预报 来确定设计值。本文就一艘大型集装箱船舶,按五个典型海域的海浪统计资料,对波浪弯矩及 波浪合成弯矩作了长期预报计算,并与 IACS的统一纵强度要求UR—S11的结果作了比较和 分析,给出了对船舶结构直接计算设计有指导意义的几点结论。 相似文献
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大开口船波浪载荷长期预报和弯扭强度整船有限元分析 总被引:11,自引:1,他引:10
大开口船全船弯扭联合变形与应力的精确计算,必须在整船结构模型上完成。本文以一艘5万吨级大开口船为例,用三维流体动力计算程序进行了波浪随机载荷的长期预报,并在此基础上导出设计波参数组,进而在全船整体结构有限元模型上计算了船体结构在各设计波上的应力分布,并采用嵌入精细舱口角区有限元网络的方法,在整船分析的同时计算出舱口角的应力集中值,获得了船体结构强度的详尽信息。文中阐述了波浪载荷的特点,设计波的确定,浮体完整结构计算的惯性平衡及大开口船的全船计算方法。 相似文献
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