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首页> 外文期刊>The journal of ocean technology >A SYSTEMATIC INVESTIGATION OF SHIP RESISTANCE REDUCTION BY BEAM INCREMENT FOR SMALL CRAFT
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A SYSTEMATIC INVESTIGATION OF SHIP RESISTANCE REDUCTION BY BEAM INCREMENT FOR SMALL CRAFT

机译：用小梁的梁增量系统研究降低船体的阻力

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摘要

Model tests conducted with a conventional fishing boat model (UBC series model #3) showed that its hull resistance could be reduced by a systematic application of the parabolization concept, a process in which the parallel middle body of the vessel is expanded outward with locally parabolic waterlines. To accomplish this, modifications were made to the hull of a model using add-on retrofits to parabolize the waterlines continuously about the middle body. Residuary resistance values were experimentally obtained and compared with expected predictions based on Michell's integral. These numerical and experimental results suggest that there could be a significant reduction in the ship's Effective Horse Power (EHP) at modest to relatively higher Froude numbers by parabolization of the water lines. The tests show that parabolization might also be used as a retrofit to reduce the EHP of a large class of ships including small craft.rnAn improved hull was designed and tested to combine and validate the results obtained in these tests. An extension of the experimental results to numerical optimization methods suggests that the application of conventional constraints, such as constant beam and constant displacement, may not be appropriate at higher Froude numbers. In addition, the tests showed that the frictional resistance coefficient increased during this process, which could be seen contradicting Froude's hypothesis.
机译：用常规渔船模型（UBC系列3号模型）进行的模型试验表明，通过系统地应用抛物线概念可以降低船体的阻力，在该过程中，船体的平行中体与局部抛物线一起向外扩展水线。为了实现这一目标，使用附加改装对模型的船体进行了修改，以使中体周围的水线不断地被抛物线化。通过实验获得剩余电阻值，并将其与基于Michell积分的预期预测进行比较。这些数值和实验结果表明，通过水线的抛弃，船舶的有效马力（EHP）可能会从中等到相对较高的弗洛德数显着降低。测试表明，抛物线化也可以用作降低包括小型船舶在内的大型船舶的EHP的改进。设计并测试了一种改进的船体，以结合并验证在这些测试中获得的结果。将实验结果扩展到数值优化方法表明，常规约束（例如恒定梁和恒定位移）的应用可能不适用于更高的Froude数。此外，测试表明，在此过程中摩擦阻力系数增加了，这可能与弗洛德的假设相矛盾。

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