Control of lines of curvature for plate forming in shipbuilding
Control of lines of curvature for plate forming in shipbuilding
复制标题
DOI：
10.1016/j.cagd.2019.101785
复制
发表时间：
2019-11-01
影响因子：
1.5
通讯作者：
Maekawa, Takashi
中科院分区：
文献类型：
--
作者：
Takezawa, Masahito;Matsuo, Kohei;Maekawa, Takashi
船体由光滑的流线型表面组成，满足水动力特性，如摩擦、压力和波浪阻力。它包含双曲面，特别是在船头和船尾。在造船中，表面板是由冷弯和热弯混合而成的，这通常被称为线加热。一种有效的基于曲率线的板材成形方法最近引起了研究人员的关注。要切割的板的初始形状、冷弯的弯曲量和线加热的收缩量可以通过沿曲率线展平双曲面来确定。然而，如果曲率线是波浪形的，或者在脐带点附近通过，则该方法会受到影响。在此，我们提出了一种新的方法，通过基于非线性优化在指定的偏离设计表面的范围内变形表面来平滑曲率线并将脐带从每个隔板上扫出。我们将该方法应用于某造船厂提供的散货船的船头，验证了该方法的有效性。(C)2019爱思唯尔B.V.保留所有权利。
A ship hull consists of smooth streamlined surfaces satisfying hydrodynamic characteristics such as frictional, pressure, and wave resistances. It contains doubly curved surfaces particularly at the bow and stern. In shipbuilding, surface plates are formed by the mixture of cold and hot bending, which is typically called line heating. An efficient plate forming method based on the lines of curvature has recently garnered the attention of researchers. The initial shape of the plate to be cut, amount of bending angle for cold bending, and amount of contraction for line heating can be determined by flattening the doubly curved surface along the lines of curvature. However, the method suffers if the lines of curvature are wavy, or pass near the umbilical points. We herein propose novel methods for smoothing the lines of curvature and sweeping out the umbilics from each partitioned plate by deforming the surface within a prescribed deviation from the designed surface based on nonlinear optimization. We demonstrated the effectiveness of our proposed method by applying it to the bow of a bulk carrier, which was provided by a shipbuilding yard. (C) 2019 Elsevier B.V. All rights reserved.