The Seakeeping Investigation of an Inverted Bow Hull by Experimental Method

Majid Askary Sayar, Abolfath Askarian khob, Karim Akbari Vakil Abadi, H. Ghassemi
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Abstract

This paper investigates the heave and pitch motion responses of an inverted bow hull. The experimental data were obtained from seakeeping tests with two scaled models of reference fishing vessel NA8-14 BSRA. The bow shape of the models is redesigned by inverted shape in two angles of 45 and 60 degrees. Several tests were conducted on the models at different speeds of 0.6, 0.9, and 1.2.m/s. Generated waves in the towing tank are of the regular type with the wavelength changing from 0.6L to 1.6L by an increment of 0.2L m. The amplitude of the waves was equal to either 35 mm. The heave and pitch response amplitude operator (RAO) versus no dimensional frequencies are presented. The investigations demonstrated that by decreasing inversion angle of bow to 45 degrees motions of the model improved. The results also showed that the interactions between the motions responses leads to the frequent appearance of “Kinks” in a coupled form with the responses of other motions .
用实验方法研究倒船首船体的耐浪性
本文研究了倒置船头船体的升沉和纵摇运动响应。实验数据是通过使用两个比例模型的参考渔船NA8-14 BSRA的耐波性测试获得的。模型的弓形通过45度和60度两个角度的倒置形状进行了重新设计。在0.6、0.9和1.2.m/s的不同速度下,对模型进行了几次测试。拖曳池中产生的波浪是规则类型的,波长从0.6L变化到1.6L,增量为0.2L m。波浪的振幅等于35mm。给出了垂荡和纵摇响应振幅算子(RAO)与无量纲频率的关系。研究表明,通过将船头的反转角减小到45度,模型的运动得到了改善。结果还表明,运动响应之间的相互作用导致“扭结”以与其他运动响应耦合的形式频繁出现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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