内自由面条件下考虑前进速度效应的增强统一理论

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
M. Kashiwagi
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引用次数: 3

摘要

增强统一理论(EUT)已被用作大阪大学远洋船舶研究计划(RIOS)开发的集成系统的核心理论,用于预测船舶在实际海洋中的推进和耐波性能。在本研究中,通过部分采用Ogilvie和Tuck的有理条理论中的求解方法作为内部问题的特定解,对EUT进行了修改,从而在内部解中加入了自由表面条件对流项中的正向速度效应。分析表明,这种正向速度效应只对交叉耦合辐射力有贡献。以类似于Newman统一理论的方式,通过与外部解的匹配,在低频范围内重要的其他一些正向速度和3D效应也被包括在内部解的均匀分量中。对细长修正Wigley模型和RIOS散货船模型进行了数值计算。通过与实验数据的比较,证实了良好的一致性,这些数据涉及升沉和纵摇之间的交叉耦合附加质量和阻尼系数,以及由此产生的船舶运动,特别是在共振频率附近的升沉中。发现运动谐振波长周围增加的阻力得到了改善,但对起伏和俯仰运动的微小变化敏感。因此,需要强调的是,准确预测船舶运动和由此产生的Kochin函数对于更准确地预测波浪中的附加阻力至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced Unified Theory with Forward-Speed Effect Taken into Account in the Inner Free-Surface Condition
The enhanced unified theory (EUT) has been used as a core theory in the integrated system developed at the Research Initiative on Oceangoing Ships (RIOS) of Osaka University for predicting the propulsion and seakeeping performance of a ship in actual seas. In this study, the EUT is modified by adopting partially the solution method in the rational strip theory of Ogilvie and Tuck as a particular solution in the inner problem, thereby a forward-speed effect in the convection term of the free-surface condition is incorporated in the inner solution. This forward-speed effect is analytically shown to contribute only to the cross-coupling radiation forces. Some other forward-speed and 3D effects important in a low-frequency range are also included in the homogeneous component of the inner solution through matching with the outer solution in a similar manner to the unified theory of Newman. Numerical computations are implemented for a slender modified Wigley model and the RIOS bulk carrier model. Good agreement is confirmed in a comparison with experimental data for the cross-coupling added mass and damping coefficients between heave and pitch and also for the resulting ship motions, particularly in heave near the resonant frequency. The added resistance around the motion-resonant wavelength is found to be improved but sensitive to a slight change in heave and pitch motions. Thus, it is stressed that accurate prediction of the ship motions and resultant Kochin function is critical for more accurate prediction of the added resistance in waves.
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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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