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Optimal Elastic Response and Design of Very Large Floating Structure

超大型漂浮结构的最优弹性响应与设计

基本信息

批准号：
07305065
负责人：
SUZUKI Hideyuki
金额：
$ 2.18万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07305065/
关键词：
Very Large Floating Structure Elastic Response Pontoon Type Semi-submersible Type Matching Resonance Natural Frequency Elastic Foundation 半潜式海洋構造物

项目摘要

A very large floating structures is a promising solution to satisfy the demand for flat land in Japan. Shallow waters suitable for reclamation have been already reclaimed, and deeper waters where reclamation is not easy must be utilized.The general dynamic response characteristics of a very large floating structure in the order of kilometers were analyzed and discussed using simplified numerical models. The models are of an anisotropic plate or beam on an elastic foundation. This modeling is a simple one but gives a general understanding and perspective of the elastic response characteristics of a very large floating structure. Based on the understanding obtained from this model, structural planning and design which utilize the advantages and avoid the disadvantages of the structure become possible.It was shown that the natural frequencies of the eigenmodes are higher than the natural heave frequency of the structure. The matching of the elastic mode and the spatial wave excitation pat … More tern, in addition to the coincidence of natural frequency and wave frequency, is necessary for the divergent resonance response. The characteristic length, which is a useful measure to juddge the deformation of the structure, is defined from the bending rigidity and the spring constant of the restoring force. For waves whose wavelength is longer than the characteristic length, the structure is relatively flexible and shows deformation on the wave slope. For waves of shorter wavelength than the characteristic length, the structure is relatively rigid and shows little deformation.A new pontoon type very large floating structure was proposed. The outer edge were modified and utilized as a control device to improve response characteristics of overall response of the structure. The improved response was confirmed by a series of calculations. The method of analysis used was to connect segmentally the analytical solutions of a uniform beam on an elastic foundation.The response of very large floating structure under take-off and landing loads of aircrafts was evaluated and the effect of interaction between the aircraft and the structure was discussed. The accuracy of calculation method was confirmed by experiment with small clastic experimental model. From the calculation, it can be said that net increase of resistance on the aircraft induced by the structure is very small. Less

在日本，超大型浮式结构物是一种很有前途的解决方案，可以满足对平地的需求。适合填海的浅沃茨已经填海，较深的不容易填海的沃茨必须利用。采用简化的数值模型，分析和讨论了千米级超大型浮体结构的一般动力响应特性。模型是弹性地基上的各向异性板或梁。该模型是一个简单的模型，但给出了一个非常大的浮式结构的弹性响应特性的一般理解和观点。基于该模型的认识，可以进行结构的规划和设计，使结构的优化设计成为可能，其特征模态的固有频率高于结构的固有垂荡频率。弹性模态与空间波激励模态的匹配 ...更多信息除了固有频率与波频的一致性外，端部的共振响应发散也是必要的。由弯曲刚度和恢复力的弹簧常数定义了结构的特征长度，它是判断结构变形的一个有用尺度。对于波长大于特征长度的波，结构相对柔性，在波坡上表现出变形。在波长小于特征长度的波浪作用下，该结构具有较好的刚性，变形较小，提出了一种新型的浮筒式超大型浮体结构。对结构的外边缘进行了改进，并将其作为控制装置，以改善结构的整体响应特性。通过一系列计算证实了改善的响应。采用分段连接弹性地基上均匀梁解析解的分析方法，计算了大型浮体结构在飞机起降载荷作用下的响应，并讨论了飞机与结构相互作用的影响。通过小型碎屑岩模型试验验证了计算方法的准确性。从计算中可以看出，结构引起的飞机阻力净增加很小。少