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的船舶机动性临时标准非常需要在设计阶段预测船舶机动性。在该预测的研究项目中，我们测量了作用在船体上的流体动力的过渡特性，并试图通过过渡特征估算稳态的流体动力。首先，我们研究了一种估计模型船的质量的方法，这对于分析作用在运动中的船上的水动力力是必不可少的。从这项研究中，我们开发了一种简单的方法来通过模型实验来测量增加的质量，并为块类型船的额外质量估算得出了快速图表。我们还开发了一种通过使用CFD来估计质量的方法，而CFD无需进行模型实验。接下来，我们研究了动作运动中流体动力的组成型数学模型，以理解力的机理。在该研究项目中，我们对几种船舶模型进行了倾斜的牵引测试，以了解流体动力的过渡特征。从使用组分型数学模型对流体动力的时间历史分析，我们得到了以下结论。1。跨流阻力成分是过渡效应的重要因素。在恒定速度运动开始时，具有矩形横截面的船的横流阻力很快到达稳定状态。另一方面，更实用的船的跨流阻力需要大量时间才能保持状态2。粘性升力部件的过渡效果在弓上而不是船尾更为突出。但是总体流体力学作用的影响很小。3。根据上述结果，似乎可以从斜牵引运动中的过渡特征中大致估算稳态的流体动力。

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。