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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 VISCOUS ROLL DAMPING ON THE DTMB MODEL 5617 HULL FORM
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EXPERIMENTAL INVESTIGATION OF VISCOUS ROLL DAMPING ON THE DTMB MODEL 5617 HULL FORM

机译：DTMB 5617型船型粘性轧制阻尼的实验研究

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A systematic series of model tests have been performed at NSWCCD to explore the mechanisms of roll damping around a conventional combatant hull form (DTMB model #5617) and an advanced tumble-home hull form (DTMB model #5613-1). Both free roll decay and forced oscillation experiments were carried out in calm water and in waves, over a range of forward speeds. These experimental investigations were performed within the overall context of continuing efforts to advance the capability to assess seakeeping, maneuvering, and dynamic stability characteristics of a surface combatant. Data gathered in these experiments are currently being utilized to develop empirical and analytical roll damping models and to validate the accuracy of simulation programs in the calculation of various components of hydrodynamic forces. This paper will specifically discuss a single-degree-of-freedom free roll decay experiment, with measurements of the appendage lateral force and the associated flow field generated during ship roll motion on the DTMB #5617 model. Using particle-image velocimetry (PIV) measurements, two-dimensional unsteady flow patterns around the bilge keels were performed to study the mechanisms of viscous roll damping due to bilge keels. In addition, lateral forces and moments on the bilge keels, rudders, and propellers have been measured to provide a direct assessment of component roll damping. Analysis for appendage forces and correlation with the measured flow field yield several new important insights into the physical mechanisms of bilge keel roll damping. Flow field observation reveals complex phenomena of viscous flow separations and vortex formation around the bilge keel during different phases of the roll motion cycle. The lateral force on
机译：在NSWCCD上已进行了一系列系统的模型测试，以探索围绕传统战斗舰船体形式（DTMB型号＃5617）和高级滚滚式船体形式（DTMB型号＃5613-1）的侧倾阻尼机制。自由滚动衰减和强制振荡实验均在一定范围的前进速度下在平静的水面和波浪中进行。这些实验研究是在不断努力的整体背景下进行的，以提高评估水面战斗舰的航海，机动和动态稳定性特征的能力。这些实验中收集的数据目前正用于开发经验和分析侧倾阻尼模型，并在计算流体动力的各个分量时验证模拟程序的准确性。本文将专门讨论单自由度自由侧倾衰减实验，并测量在DTMB＃5617模型上船舶侧倾运动过程中产生的肢体侧向力和相关流场。使用颗粒图像测速（PIV）测量，对舱底龙骨周围的二维非稳态流动模式进行了研究，以研究舱底龙骨引起的粘性侧倾阻尼机制。此外，还对舱底龙骨，舵和螺旋桨上的侧向力和力矩进行了测量，以直接评估部件的侧倾阻尼。附属力的分析以及与测得的流场的关系产生了一些新的重要见解，这些见解是舱底龙骨侧倾阻尼的物理机理。流场观察揭示了在侧倾运动周期的不同阶段，在船底龙骨周围粘性流分离和涡流形成的复杂现象。侧向力

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