EXPERIMENTAL STUDY ON HEAVE AND PITCH MOTION CHARACTERISTICS OF A WAVE-PIERCING TRIMARAN
EXPERIMENTAL STUDY ON HEAVE AND PITCH MOTION CHARACTERISTICS OF A WAVE-PIERCING TRIMARAN
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DOI：
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发表时间：
2014-11
影响因子：
1.3
通讯作者：
K. A. Vakilabadi;M. Khedmati;M. Seif
中科院分区：
文献类型：
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作者：
K. A. Vakilabadi;M. Khedmati;M. Seif
本文研究三体船的动力特性。三体船的船体由一个中心船体和两个外伸臂组成，中心船体具有相当细长的穿波船首剖面（长宽比为12.96），外伸臂具有Wigley数学体型。在拖曳水池中对三体船模型进行了几次耐波性试验，以研究其在不同佛汝德数0.2，0.37和0.51下的升沉和纵摇运动。拖曳水池中产生的波浪为规则波，波长在0.6 ~ 2.4m之间变化，变化幅度为0.3m。波的振幅等于25 mm或35 mm。在起伏响应振幅算子（RAO）与无量纲波长（约1.0）的曲线上可以检测到共振峰。弗劳德数的增加导致升沉RA一维波频图的后共振峰区迅速下降。螺距RAO值对小于0.8的无量纲波长的变化对弗劳德数和波幅值的变化不太敏感。此外，对于大于2.5至2.8的无量纲波频率的值，节距RAO不经历作为弗劳德数或波幅的变化的结果的任何显著变化。
Dynamic behaviour of a trimaran vessel is investigated in this study. The body of the trimaran is composed of a centre hull with a quite slender wave piercing bow profile (a length-to-width ratio of 12.96) and two outriggers with Wigley mathematical body forms. Several seakeeping tests are conducted on the model of the trimaran vessel in a towing tank in order to study its heave and pitch motions at different Froude numbers of 0.2, 0.37, and 0.51. Generated waves in the towing tank are of regular type with the wave length changing from 0.6 m to 2.4 m by an increment of 0.3 m. Amplitude of the waves is equal to either 25 mm or 35 mm. A resonance peak can be detected on the curve of the heave response amplitude operator (RAO) versus nondimensional wave length of around 1.0. Increasing the Froude number leads to rapidly descending post-resonance-peak regions of the heave RAOnondimensional wave frequency diagrams. Changes in the value of the pitch RAO versus nondimensional wave lengths of less than 0.8 are not so sensitive to the changes in the values of Froude number and wave amplitude. Also, for the values greater than 2.5 to 2.8 of the nondimensional wave frequency, the pitch RAO does not experience any significant changes as a result of variations in the Froude number or wave amplitude.