操縦性流体力の過渡特性に関する研究

机动流体力瞬态特性研究

• 批准号: 09651011
• 负责人: KARASUNO Keiichi
• 金额: $ 2.18万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09651011/
• 关键词: Hydrodynamic forces in maneuvering motion; Towing test with ship models; Transitional characteristics of hydrodynamic forces; 拘束曳航試験

The interim standards of ship maneuverability by IMO are badly in need of the prediction of ship maneuverability at design stage. In this research project for the prediction, we measured the transitional characteristics of hydrodynamic forces acting on ship hulls and tried to estimate the hydrodynamic forces in steady state from the transitional characteristics. First, we studied a method to estimate the added mass of a model ship, which is indispensable to analyze hydrodynamic force acting on the ship in motion. From this study, we developed a simple method to measure the added mass by a model experiment and made out a quick chart of the added mass estimation for block type ship. We also developed a method to estimate the added mass by using CFD, which does not need to carry out model experiments. Next, we studied about a component-type mathematical model of hydrodynamic forces in maneuvering motion to comprehend the mechanism of the forces. In this research project, we carried out oblique towing tests of several ship models to understand the transitional characteristics of hydrodynamic forces. From the analysis of time histories of hydrodynamic forces by using the component-type mathematical model, we got the following concluding remarks.1. The cross flow drag component is a significant factor of the transitional effect. At the beginning of constant velocity in motion, the cross flow drag of the ship that has a rectangular cross section, reaches quickly to a steady state. On the other hand, the cross flow drag of more practical ship needs much time to be stead state.2. The transitional effect of the viscous lift component is more prominent at the bow rather than the stern. But the effect is very little in total hydrodynamic force.3. From the results described above, it seems to be possible to estimate roughly the hydrodynamic forces in steady state from the transitional characteristics in the oblique towing motion.

IMO关于船舶操纵性的临时标准迫切需要在设计阶段对船舶操纵性进行预测。在这个预测研究项目中，我们测量了作用在船体上的水动力的过渡特性，并尝试根据过渡特性来估计稳态下的水动力。首先，我们研究了一种估计模型船附加质量的方法，这对于分析运动中船舶所受的水动力是必不可少的。通过这项研究，我们开发了一种通过模型实验测量附加质量的简单方法，并制作了块式船舶附加质量估算的快速图表。我们还开发了一种利用CFD来估计附加质量的方法，该方法不需要进行模型实验。接下来，我们研究了机动运动中水动力的分量型数学模型，以理解力的机制。在本研究项目中，我们对多个船模进行了斜拖试验，以了解水动力的过渡特性。利用分量型数学模型对水动力时程进行分析，得到以下结论： 1．错流阻力分量是过渡效应的重要因素。在匀速运动开始时，矩形截面船舶的横流阻力很快达到稳定状态。另一方面，较实用的船舶横流阻力需要较长的时间才能达到稳态。 2．粘性升力分量的过渡效应在船头而不是船尾更为突出。但对总水动力的影响很小。3．从上述结果来看，似乎可以根据倾斜拖曳运动的过渡特性粗略地估计稳态下的水动力。

项目成果

K. KARASUNO: "A Quick Chart for Added Mass of Floating Structures with Block Types"J. Kansai Soc. Nav. Archt., Japan. Vol.229. 79-85 (1998)

K. KARASUNO：“带有块类型的浮动结构增加质量的快速图表”J。

前川和義: "CFDによる定加速度斜航試験"関西造船協会誌. 312. 55-62 (1999)

Kazuyoshi Maekawa：“使用 CFD 的恒定加速度倾斜测试”关西造船协会杂志 312. 55-62 (1999)。

K. MAEKAWA: "Estimation of Added Mass Coefficients m'x, m'y by using CFD through Oblique Towing Test with Constant Acceleration"J. Kansai Soc. N.A., Japan. Vol.232. 55-61 (1999)

K. MAEKAWA：“通过恒定加速度倾斜牵引试验使用 CFD 估算附加质量系数 mx, my”J.

前川和義: "CDFによる定加速度斜航試験"関西造船協会誌. 232. 55-61 (1999)

Kazuyoshi Maekawa：“使用 CDF 的恒定加速度倾斜试验”关西造船协会杂志 232. 55-61 (1999)。

K. KARASUNO: "A Component-type Mathematical Model of Hydrodynamic Forces in Steering Motion Derived from a Simplified Vortex Model (3) - Trim Condition and 2 Support Point System Analysis -"J. Soc. Nav. Archt. Japan. Vol.184. 71-80 (1998)

K. KARASUNO：“由简化涡模型导出的转向运动水动力的分量型数学模型（3）-配平条件和 2 个支撑点系统分析 -”J。