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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.4; 20070610-15; San Deigo,CA(US) >EXPERIMENTAL INVESTIGATION OF HYDRODYNAMIC COEFFICIENTS OF A WAVE-PIERCING TUMBLEHOME HULL FORM
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EXPERIMENTAL INVESTIGATION OF HYDRODYNAMIC COEFFICIENTS OF A WAVE-PIERCING TUMBLEHOME HULL FORM

机译：穿孔圆鼓形船体形式的水动力系数的实验研究

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摘要

A systematic series of calm-water forced roll model tests were performed over a range of forward speeds using an advanced tumblehome hull form (DTMB model #5613-1) to examine the mechanisms of roll damping. This experimental investigation is part of an ongoing effort to advance the capability to assess seakeeping, maneuvering, and dynamic stability characteristics of an advanced surface combatant. The experiment was performed to provide data for development and validation of a semi-empirical roll damping model for use in validation of ship motion and viscous flow simulation codes, as well as to provide a basis for future work with additional experiments, contributing to the development of an improved analytical roll damping model. Two hull configurations were tested: barehull with skeg, and bare hull with skeg and bilge keels. Measurements of forces and moments were obtained over a range of forward speeds, roll frequencies, and roll amplitudes. Stereo particle-image velocimetry (SPIV) measurements were also taken for both zero and forward speeds. Test data was used to calculate added mass/inertia and damping coefficients. Two different system modeling techniques were used. The first method modeled the system as an equivalent linearly-damped second-order harmonic oscillator with the time-varying total stiffness coefficient considered linear. The second technique used equivalent linear damping, including higher-order Fourier components, and a non-linear stiffness formulation. Results are shown, including plots of added inertia and damping coefficients as functions of roll frequency, roll amplitude, and forward speed and SPIV measurements. Trends from the experimental data are compared to results from traditional component roll damping formulations for conventional hull form geometries and differences are discussed.
机译：使用先进的不倒翁船体形式（DTMB型号＃5613-1），在一系列前进速度下进行了一系列系统的平静水强制侧倾模型测试，以检验侧倾阻尼的机理。这项实验研究是不断努力的一部分，旨在提高评估先进水面战斗机的航海，机动和动态稳定性特征的能力。进行该实验以提供数据以开发和验证半经验侧倾阻尼模型，以用于验证船舶运动和粘性流仿真代码，并为以后的工作和其他实验提供基础，从而为开发做出贡献分析辊阻尼模型的改进。测试了两种船体配置：带有skeg的裸露船体和带有skeg和舱底龙骨的裸露船体。在前进速度，侧倾频率和侧倾幅度的范围内获得了力和力矩的测量值。还针对零速和前进速度进行了立体粒子图像测速（SPIV）测量。测试数据用于计算附加的质量/惯性和阻尼系数。使用了两种不同的系统建模技术。第一种方法将系统建模为等效的线性阻尼二阶谐波振荡器，其时变总刚度系数被认为是线性的。第二种技术使用等效线性阻尼，包括高阶傅立叶分量和非线性刚度公式。显示了结果，包括增加的惯性和阻尼系数与侧倾频率，侧倾幅度，前进速度和SPIV测量的关系图。将实验数据的趋势与传统船体形状的传统组件侧倾阻尼公式的结果进行了比较，并讨论了差异。

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