Abstract

The ship hull form is directly related to each design phase of a ship. This form is thus frequently designed based on a variation of a well-made parent ship to avoid new design risks. However, in hull form variation, satisfactory geometric preservation and good performance continuity of the parent ship are considered competing requirements. To effectively facilitate the variation, an appropriate compromise between these requirements should be achieved. Instead of altering hull form parameters, we propose a flexible and intuitive approach to interactively vary the hull surfaces with arbitrary curve constraints and to focus on preserving the properties of the original hull surface. The advantage of the superposition of the curve or surface is leveraged to modify the hull shape. An intermediate surface that satisfies an intermediate curve constraint and has a smooth shape is constructed and superimposed on the top of the original surface to yield the desired surface. A shape control mechanism using a shape function simplifies the control of the surface modification with a curve constraint. The developed method was applied to modify the characteristic curves and section curves situated on the stern part of a container vessel. The changes in the geometric shape and hydrodynamic performance due to the curve-constraint variation were assessed to demonstrate the practicality and efficiency of the proposed method. The results show that the proposed method produces a smooth shape and almost unchanging hydrodynamic patterns. The proposed variation provides an effective tool for varying the hull in a linear fashion.

中文翻译：

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通过在表面上叠加满足由任意特征曲线给出的船体变化的分段形状函数进行表面修饰

摘要

船体形式与船舶的每个设计阶段直接相关。因此，这种形式通常是根据制造精良的母船的变体设计的，以避免新的设计风险。然而，在船体形式变化中，母船的令人满意的几何保留和良好的性能连续性被认为是相互竞争的要求。为了有效地促进变化，应在这些要求之间实现适当的折衷。我们没有改变船体形状参数，而是提出了一种灵活直观的方法，以交互方式改变具有任意曲线约束的船体表面，并专注于保留原始船体表面的属性。利用曲线或曲面叠加的优势来修改船体形状。构造满足中间曲线约束并具有平滑形状的中间曲面并叠加在原始曲面的顶部以产生所需曲面。使用形状函数的形状控制机制通过曲线约束简化了对表面修改的控制。所开发的方法用于修改位于集装箱船尾部的特性曲线和剖面曲线。评估了由于曲线约束变化引起的几何形状和流体动力学性能的变化，以证明所提出方法的实用性和效率。结果表明，所提出的方法产生平滑的形状和几乎不变的流体动力学模式。提议的变化提供了一种以线性方式改变船体的有效工具。