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Extraction of note in present design method of circular cylinder structure with fluid and development of reasonable design method

现有流体圆柱体结构设计方法中的注意点提取及合理设计方法的发展

基本信息

批准号：
19860086
负责人：
NAGINO Harunobu
金额：
$ 1.65万
依托单位：
Oita National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (Start-up)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2008
项目状态：
已结题

项目摘要

厳しい経済状況と環境下での社会基盤施設の建設を要求されている我国では,設計段階での設計精度の向上とコスト縮減が実務設計において急務であるため,先ず,現設計法の留意点や問題点を抽出する必要がある.本研究では,このような問題を解決するために,海洋空間に建設される円筒構造物に着目し,水中にある円筒構造物のより正確な自由振動特性を解明し,また,現設計法の留意点や問題点の抽出を試みた.その結果,(1) 液体に接する厚肉な中空円筒体及び中実円筒体では曲げ振動が基本振動数になるため,曲げに関する自由振動特性の把握が重要になること,(2) 液体に接する厚肉中空及び中実円筒体の曲げに関する固有振動数及び固有振動モードは,液体に接していない円筒体の固有振動数及び固有振動モードから推定が可能であること,(3) 中空円筒体の厚さが薄く,円筒体が長くなると液体の影響を受けやすいこと,(4) 円筒体の厚さ,長さ及び液体の高さに係わらず,Timoshenko 梁理論は3 次元弾性論の代替として十分に使用できること,(5) 古典梁理論は,円筒体の長さが十分に長い場合であれば,3 次元弾性論の代替として適用可能であること,を明らかにした.

In the normal environment, the construction of social infrastructure requires that the design accuracy of the design section should be improved, the design accuracy should be improved, and the urgent business should be met. First, pay attention to the problem points and draw out the necessary information. In this study, the engineering problems are solved, the marine space construction equipment is focused, and the free vibration characteristics of the underwater vehicle are correctly understood, and the equipment design method is used to pay attention to the problem points. The results of the test are as follows: (1) the basic number of vibration of the hollow cylinder and the middle drum of the thick meat drum of the liquid pump is very important, and the free vibration characteristics of the cylinder are very important. (2) the number of natural vibration and the natural vibration of the cylinder body of the thick meat hollow and the middle drum of the liquid pump are very important to grasp the free vibration characteristics. It is presumed that the number of natural vibration and the natural vibration of the cylinder body of the liquid cylinder may be damaged, (3) the hollow cylinder is thick and thin, and the liquid is affected by the temperature of the cylinder, and (4) the thickness of the cylinder, the length of the cylinder and the temperature of the cylinder are affected by the temperature. In Timoshenko beam theory, three-dimensional mechanical properties are used in place of mechanical devices, (5) classical girder structures, cylinder lengths are very long, and three-dimensional mechanical properties are used in place of mechanical properties.