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板モデルを用いたVLFSの波浪中弾性挙動に関する研究

利用板模型研究 VLFS 在波浪中的弹性行为

基本信息

批准号：
10750666
负责人：
坪郷尚
金额：
$ 1.22万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Encouragement of Young Scientists (A)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10750666/
关键词：
VLFS Hydroelasticity Dispersion Relation Group Velocity Phase Velocity Water Wave Diffraction Pontoon Type Semi-submersible Type 流力弾性分散関係

项目摘要

ポンツーン型VLFSの波浪中弾性挙動に関する研究として,本年度は大楠らの方法を用いて波浪応答の様子を調ベるともに,上部構造体の振動とVLFS上に発生する流力弾性波との関係について調べた.また,セミサブ型VLFSに作用する波浪外力の共振問題についても考察を行った.得られた知見を以下にまとめる.1.長大なVLFSの自由端において,低い振動数の変位励振を行うと水面上・浮体上共に発散波振幅は小さく,高い振動数の変位励振を行うと,水面上の発散波振幅は非常に大きくなり,浮体上の発散波振幅は強制変位振幅の1/3倍程度となる.2.長大なVLFSの中央部において,傾斜が常に0であるような,低い振動数の変位励振を行うと浮体上の発散波振幅は小さく,高い振動数の変位励振を行うと浮体上の発散波振幅は強制変位振幅程度となる.3.VLFS上を伝播する流力弾性波は波長の長いものほど水波側に透過しやすい.4.VLFS上の上部構造物が振動することによりVLFS上に流力弾性波が発生するが,これにより上部構造物自身の振動は減衰する.5.この場合の造波減衰係数はVLFSの剛性が大きいほど,また水深が浅いほど大きい.6.セミサブ型VLFSに作用する波浪外力はある特定の入射波長で非常に大きくなり,注意が必要である.

The study of sexual activity in VLFS waves has been carried out. This year, the wave response method is used to answer the waves. The upper part of the body vibrates on the VLFS to generate current force. The effect of VLFS on the resonance of external wave forces is studied in detail. You have to know the following information. 1. The amplitude of the common scattered wave on the floating body on the water surface is small, the amplitude of the scattered wave on the floating body with high vibration number is very high, the amplitude of the scattered wave on the water surface is very high, and the amplitude of the scattered wave on the floating body is 3 times higher than that of the floating body. 2. In the central part of the VLFS, the amplitude of the scattered wave on the floating body is small, and the amplitude of the scattered wave on the floating body is small. The amplitudes of scattered waves on the floating body are much higher than those of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body increases the amplitude of scattered waves. 3.The amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is much higher than that of the floating body. the amplitude of scattered waves on the floating body is dependent on the amplitude of scattered waves on the floating body. 3. The amplitude of scattered waves on the floating body The number of wave decay caused by the combination of waves, the number of VLFS waves, the depth of water, the number of waves, the number of waves. The wave external force is very sensitive to the wave external force. The incident wave length is very large, so pay attention to the necessary wave length.