Development of a Very Large Floating Structure with a Submerged Plate

超大型水下板漂浮结构的开发

基本信息

批准号：
12555280
负责人：
TAKAKI Mikio
金额：
$ 5.44万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

We have proposed a new very large floating structure with a submerged plate for the purpose of developing a very large floating structure (VLFS) with a conventional breakwater system, and have performed the following studies.1. We have developed the numerical computing program for estimating the hydrodynamic forces on the submerge plate and the fore part of the very large floating structure with the submerged plate, and have performed the experimental studies. The following conclusions are obtained.(1) The breaking waves are generated on the submerged-plate in short wave periods, and it dissipates the incident wave energy. As a result, all of the wave exciting forces on the fore part of VLFS are decreasing.(2) The added mass on the submerged-plate oscillating near VLFS is slightly larger than the one on the submerged plate only for all oscillation frequencies, while the damping forces coefficients increase with the oscillation frequencies. Thereby, it has been made clear that the incre … More ase of the total hydrodynamic forces on submerged plate is induced by the increase of damping force in the high frequency range.(3) The added mass on the submerged plate takes the negative value in the long oscillation periods, and the damping force coefficients increase at the same time. Therefore, the characteristics of these hydrodynamic forces are useful for reducing the elastic deflection of VLFS in long wave periods.2. We have applied the modal analysis method to the elastic deflection of VLFS, and have made clear the effect of the submerged plate on the elastic deflection of VLFS in waves. The following new information is obtained in this study.(1) The wave exciting forces rather than the radiation forces strongly affect the reduction of the elastic deflection of VLFS.(2) The submerged plate strongly affects on the wave exciting forces rather than the radiation forces. In particular, the submerged plate is useful for reducing the elastic deflection of VLFS for short wave periods.(3) The submerged plate strongly affects the hydrodynaraic forces with the mode of less than the 8th, and it scarcely affect the ones with the higher modes.From the above studies, we are sure that the proposed method is useful is useful for reducing the elastic deflection of VLFS in waves. Less

我们为开发了一个非常大的浮动结构（VLFS）的防水系统提供了一个新的大型板，Habe进行了以下研究。1我们开发了用于估计流体动力的数值计算计划带有浸入板的浮动结构的层状和浮动结构。在VLF的前部，浸入板上的质量在VLF附近的振荡略大，而淹没板振荡自由质量y，已经明确了进口...淹没的板是在高自由度范围内的诱导力。周期。2。在尤其是辐射力的波动力上，您淹没的板是VLFS Fort Wave时期的fort板确保支撑方法方法方法方法有助于减少波浪中VLF的弹性偏转。