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Kuniaki Shoji Rajesh Ramachandran Yuzo Kurobe Yasuhisa Hashizume 《Journal of Marine Science and Technology》2002,7(2):86-90
As a result of frequent marine disasters leading to the loss of human life and pollution of vast areas of the ocean, ship
manoeuvrability has become a very important characteristic of ship design. Among several recent experimental techniques to
determine ship manoeuvrability, the most popular is captive model testing using a planar motion mechanism (PMM). This article
describes some tests, analyses, and results of PMM tests in a circulating water channel (CWC) using a model of a training
ship. The hydrodynamic forces and moments acting on a model of the training ship Shioji Maru in pure yawing motion were measured, and hydrodynamic derivatives were obtained using two different methods of analysis:
singular value decomposition (a least-squares fit method) and Fourier analysis. Derivatives obtained from the tests were used
to simulate the turning trajectory of the actual ship, and these were compared with the results of sea trials. The results
indicate that both methods of analysis yield fairly similar derivatives. The simulation results were also found to be a close
match with the trial results.
Received: February 7, 2002 / Accepted: May 14, 2002
Address correspondence to: K. Shoji (shoji@ipc.tosho-u.ac.jp) 相似文献
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循环水槽同传统拖曳水池相比具有许多优点,因而日益广泛地应用于船型开发和船舶水动力性能研究。在水槽中设置隔板可以模拟海洋中的分层流,但隔板的迟滞作用必然会对循环水槽计测部流场品质造成一定的影响。为了研究这一设想对流场的影响,数值模拟循环水槽在无隔板、整段隔板以及分段隔板情况下的流动情况。对比结果表明,采用分段隔板形式较为理想。另一方面,循环水槽作为一种基础实验设施,对其计测部的水平度有着严格要求,探讨安装中的误差或投入使用后地基沉降引起的水槽倾斜对计测部流动带来的影响。基于VOF模型,模拟水平及各倾角二维条件下循环水槽计测部的流动情况,结果表明,较大倾角时,计测部波面变化较大,且计测部末端有气泡产生,而在微小倾角时,波面变化不明显。 相似文献
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