固定矩形容器中多个月池的共振振荡

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
Suraj Garad, A. Bhattacharyya, R. Datta
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引用次数: 0

摘要

我们给出了三个圆形月池内共振自由表面振荡的实验结果,这些月池串联布置在固定矩形船只的前、中、后位置。主要捕获活塞模式共振频率,该频率随着容器吃水深度的增加而减小。目的是研究物体衍射对三个位置振荡水柱自由表面振幅和相位的影响。结果表明,通常情况下,前月球池具有最高的响应振幅,而中央和后月球池的相对振幅取决于波的频率。观察到,无量纲响应振幅随着接近共振频率的波陡度的降低而非线性增加,而这种影响在较低的波频率下减小。月池之间的振荡相位差显示了波体相互作用的影响,这一现象取决于船只吃水深度和波浪频率。最后,该研究包括对多个和单个配置在三个月池位置的响应的比较。月池是一个穿过甲板并在底部通向大海的垂直开口,安装在专门从事某些海上作业的船只上。由于波浪中的船只操作,月池中会遇到共振水柱振荡(Aalbers 1984)。另一方面,振荡水柱(OWC)已被广泛研究,主要是因为其具有海浪能量转换的潜力(Evans 1978;Heath 2012;Falcão和Henriques 2016)。现在,从设计角度来看,波浪中水柱共振的研究重点取决于特定的海洋应用。例如,波浪能转换器需要最大限度的OWC响应才能有效捕获能量(Evans&Porter 1995;Morris-Thomas等人,2007年),而钻井船月池内的大自由表面振荡会对船舶动力学产生不利影响(Fakuda 1977)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Resonant Oscillations within Multiple Moonpools for a Fixed Rectangular Vessel
We present experimental results of resonant free surface oscillations within three circular moonpools arranged in tandem at forward, central, and aft positions of a fixed rectangular vessel in head waves. The piston mode resonance frequency is primarily captured, which decreases with the increase in the vessel draft. The aim is to study the effect of body diffraction on the free surface amplitude and phase of the oscillating water columns at the three locations. The results indicate that, in general, the forward moonpool has the highest response amplitude, whereas the relative amplitudes of the central and aft moonpools depend on the wave frequency. It is observed that the nondimensional response amplitude increases nonlinearly with decreasing wave steepness close to the resonance frequency, while the effect diminishes at lower wave frequencies. The oscillation phase differences between the moonpools show effects of wave-body interaction, a phenomenon dependent on the vessel draft and wave frequency. Finally, the study includes a comparison of the responses at the three moonpool locations between multiple and single configurations. A moonpool is a vertical opening through the ship deck and open to the sea at the bottom, which is installed in vessels specialized in certain offshore operations. Resonant water column oscillations are encountered in moonpools (Aalbers 1984) due to vessel operations in waves. On the other hand, oscillating water columns (OWCs) have been extensively researched, primarily due to their potential for ocean wave energy conversion (Evans 1978; Heath 2012; Falcão & Henriques 2016). Now, considering design perspectives, the focus of the studies on water column resonance in waves depends on the specific marine application. For example, wave energy converters would require maximized OWC responses for efficient energy capture (Evans & Porter 1995; Morris-Thomas et al. 2007), while large free surface oscillations within moonpools of drillships have adverse effects on the vessel dynamics (Fakuda 1977).
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来源期刊
Journal of Ship Research
Journal of Ship Research 工程技术-工程:海洋
CiteScore
2.80
自引率
0.00%
发文量
12
审稿时长
6 months
期刊介绍: Original and Timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economic, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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