The Impulse Response Function and Motions of Floating Body

浮体的脉冲响应函数与运动

• 批准号: 60550311
• 负责人: SAITO Kimio
• 金额: $ 1.47万
• 依托单位: Faculty of Engineering, Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550311/
• 关键词: Impulse Response Function; Memory Effect Function; 海洋構造物の運動シミュレーション

In order to obtain the precise results of the motions of a moored ocean structure under the combined action of waves and/or stepwise wind force, the convolution integral equation with the memory effect function in the time domain simulation are frequently used. Therefore, in this study, the following subjects are investigated.1) Approximate evaluation method for the impulse response function (memory effect function) which is involved in the convolution integral equation.2) Validity of the time domain simulation for the motions of a moored marine structures in waves with the memory effect function evaluated by the method of 1).3) Estimation method of the memory effect function from the forced oscillationtests.From the present study, the following results are found. 1) An approximation of the integrand at high frequency region by a triangle is to be applicable for the evaluation of the memory effect function.2) Time domain simulations using the convolution integral equation for motions of a moored semi-submersible platform show a good agreement with the measurements.3) The memory effect function evaluated from the measured data in the forced oscillation test show somewhat good agreement with the one obtained by the method of 1). In order to more accurate results, further investigations are needed.

为了得到系泊海洋结构物在波浪和/或逐级风共同作用下运动的精确结果，在时域模拟中经常使用带有记忆效应函数的卷积积分方程。为此，本文研究了以下几个方面的内容：1)卷积积分方程中的脉冲响应函数(记忆效应函数)的近似计算方法；2)利用记忆效应函数的方法对系泊海洋结构物在波浪中的运动进行时域模拟的有效性；3)从受迫振动试验中估计记忆效应函数的方法。1)被积函数在高频区用三角形近似可用于记忆效应函数的评价。2)用半潜式系泊平台运动的卷积积分方程法进行的时间域模拟与测量结果吻合较好。3)强迫振动试验中由测量数据估算的记忆效应函数与文[1]中的方法得到的记忆效应函数有较好的一致性。为了得到更准确的结果，还需要进一步的调查。

项目成果

Takagi, M., Saito, K., Ookawa, Y. and Kyoe, t.: "Comparisons of Second Order Analyses on a Moored Semi-Submersible Motions in Waves" Journal of the Kansai Society of Naval Architects, Japan. No.207. 1-10 (1987)

Takagi, M.、Saito, K.、Ookawa, Y. 和 Kyoe, t.：“系泊半潜式波浪运动的二阶分析比较”日本关西造船学会杂志。

高木又男,斎藤公男,大川豊,京江宰: 関西造船協会誌. 207. 1-10 (1987)

Matao Takagi、Kimio Saito、Yutaka Okawa、Osamu Kyoe：关西造船协会杂志 207. 1-10 (1987)。