Research on vibration and damages with water-jet propulsion in high speed ships

高速船舶喷水推进振动与损伤研究

• 批准号: 09651016
• 负责人: YASUZAWA Yukitaka
• 金额: $ 1.92万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09651016/
• 关键词: high speed ship; water-jet; vibration; hydro-elasticity; FEM; BEM

Vibration and damages in water-jet propulsion in high speed ships are investigated. Water duct in which water flows fast may reduce the natural frequencies of the duct structures which are pipe structures with rectangular cross section, that is, box girder. In the present study the mechanism of the reduction of natural frequencies are clarified by constructing mechanical models arid calculation of eigen systems. In the formulation finite elements for duct structures and boundary elements for inner flow of water are used.As the result of the formulation, It has been proved that the flow reduces thestiffness of the fluid-structure coupled system and the reduction matrix is propotional to dencity and the square of the fluid velocity but added mass of water does not depend on the velocity.Furthermore the features of coupling vibration between adjacent panels or opposite panels due to the internal fluid could be obtained by the developed numerical analysis. The numerical results have been verified by the experiments.

研究了高速船舶喷水推进系统的振动和损伤。水流湍急的输水管道会降低管道结构的固有频率，而管道结构是矩形截面的管结构，即箱形梁。本文通过建立力学模型和特征系统的计算，阐明了其固有频率降低的机理。在公式中采用了管道结构的有限元和水内流的边界元，已经证明，流动降低了流体的刚度-结构耦合系统的阻尼矩阵与密度和流速的平方成正比，而附加水质量与流速无关或相对的面板由于内部流体可以通过开发的数值分析获得。数值结果得到了实验的验证。

项目成果

Y.YASUZAWA A, S.Y.Bae,et.al: "Fluid-Structure Coupled Vibration of Thin Walled-Structures" Proc. of the 12th Asian Technical Exchange and Advisary Meeting on Marine Structures. 315-324 (1998)

Y.YASUZAWA A、S.Y.Bae 等人：“薄壁结构的流固耦合振动”Proc。

安澤幸隆,香川洸二 他: "複数パネルからなる接水タンク構造の数値解析" 西部造船会々報. 96. 181-192 (1998)

Yukitaka Yasuzawa、Koji Kakawa 等人：“由多个面板组成的湿式储罐结构的数值分析”西方造船学会通报 96. 181-192 (1998)。

Y.Yasuzawa, K.Kagawa, et.al.: "Vibration analysis of water tank structures with multiple panels" Trans.of The west-japan society of naval architects. No.96. 181-192 (1998)

Y.Yasuzawa、K.Kakawa 等人：“多面板水箱结构的振动分析”Trans.of 西日本造船学会。

Y.YASUZAW,S.Y.Bae.et al.: "Fluid-Structure Coupled Vibration of Thin Walled Structures" Proc. of the 12th Asian Technical Exchange and Advisary Meeting on Marine Structures. 315-324 (1998)

Y.YASUZAW，S.Y.Bae.et al.：“薄壁结构的流固耦合振动”Proc。

Y.Yasuzawa, S.Y.Bae.et.al.: "Fluid-structure coupled vibration of thin walled structures" Proc.of the 12th Asian Technical Exchange and Advisary Meeting on Marine Structures. 315-324 (1998)

Y.Yasuzawa，S.Y.Bae.et.al.：“薄壁结构的流固耦合振动”第12届亚洲海洋结构技术交流和咨询会议记录。