STUDIES ON RELIABILITY ANALYSIS SYSTEMS OF LARGE FLOATING STRUCTURES

大型浮动结构可靠性分析系统研究

基本信息

批准号：
08305041
负责人：
OKADA Hiroo
金额：
$ 1.66万
依托单位：
OSAKA PREFECTURE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08305041/
关键词：
Large floating structures Dynamic response and strength Propagation of deflection wave Fluid-structure interaction analysis Characteristic wave number Short term prediction of extreme response Damping matrix and vibration level Identificatio

项目摘要

This study is concerned with structural strengty and reliability analysis systems of large floating structures. Results obtained in this study are summarized as follows :1) Characteristics are investigated for the dynamic response and strength of a very large floating structure (VLFS) using the simple beam modeling by analytical methods. From analytical results for the same structure replaced with a plane framework, it is also pointed out that not only vertical bending vibrations but horizontal bending and longitudinal vibrations should be considered at the lower frequency zone.2) An estimation method is also proposed for the dynamic response behavior of such a structure considering deflection wave propagation based on fluid-structure interaction analysis. From analytical results, effects of wave length and direction of incident waves on the response and strength are examined. Moreover, the dispersion relation of the deflection wave is also derived based on the analogy of the linear water wave theory.3) A simplified estimation method for dynamic response and strength under long crested irregular wave conditions is presented by combining above results. The applicability of the method is investigated through numerical examples carried out for 4700m class VLFS.4) An estimation method is presented for the fluid damping matrix and vibration level of large floating structures on comparatively higher frequency zone.5) As a structual parameter identification method ion the possible modeling for overall structural analysis of a VLFS,rational formulation of a torsional stiffness of grillage beam elements considering shear deformation of deck and bottom plating is proposed.6) As a part of the study on the structural reliability analysis of marine plate structure, a simplified method is presented for the collapse and reliability analysis using 8 node hexahedral element models.

这项研究涉及大型浮动结构的结构螺旋和可靠性分析系统。在本研究中获得的结果总结如下：1）使用分析方法的简单束建模研究了非常大的浮动结构（VLF）的动态响应和强度的特征。从与平面框架取代的相同结构的分析结果中，还可以指出，不仅应在较低的频率区域考虑垂直弯曲振动，而且还应考虑水平弯曲和纵向振动。2）2）还提出了一种估计方法，用于考虑基于流动性构造相互作用的挠度传播的这种结构的动态响应行为。从分析结果中，检查了波长的长度和入射波方向对响应和强度的影响。此外，还基于线性水波理论的类比来得出偏转波的分散关系。3）一种简化的估计方法，用于通过将上述结果结合到长长的不规则不规则波条件下的动态响应和强度。该方法的适用性通过用于4700m类VLF进行的数值示例进行了研究。4）提出了一种估计方法，用于流体阻尼矩阵和大型浮动结构的振动水平相对较高的频率区域。提出了甲板和底板的变形。6）作为有关海洋板结构结构可靠性分析的一部分，提出了一种简化的方法，用于使用8个节点六面体元素模型进行塌陷和可靠性分析。