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Optimal Active Control of Wave-Induced Vibration for Offshore Platforms

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【作者】 李华军Sau-LonJamesHUTomotsukaTAKAYAMA

【Author】 LI Huajun Sau-Lon James HUand Tomotsuka TAKAYAMA College of Engineering, Ocean University of Qingdao, Qingdao 266071, China Department of Ocean Engineering, University of Rhode Island, Narragansett, Rhode Island, 02882, USA Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

【机构】 College of EngineeringOcean University of QingdaoDepartment of Ocean EngineeringUniversity of Rhode IslandIsland02882USA Disaster Prevention Research InstituteKyoto University Qingdao 266071ChinaNarragansettRhodeGokashoUjiKyoto 611-0011Japan

【摘要】 An obvious motivation of this paper is to examine the effectiveness of the lateral vibration control of a jacket type offshore platform with an AMD control device, in conjunction with H2 control algorithm, which is an optimal frequency domain control method based on minimization of H2 norm of the system transfer function. In this study, the offshore platform is modeled numerically by use of the finite element method, instead of a lumped mass model. This structural model is later simplified to be single-degree-of-freedom (SDOF) system by extracting the first vibration mode of the structure. The corresponding "generalized" wave force is determined based on an analytical approximation of the first mode shape function, the physical wave loading being calculated from the linearized Morison equation. This approach facilitates the filter design for the generalized force. Furthermore, the present paper also intends to make numerical comparison between H2 active control and the corresponding passive control using a T

【Abstract】 An obvious motivation of this paper is to examine the effectiveness of the lateral vibration control of a jacket type offshore platform with an AMD control device, in conjunction with H2 control algorithm, which is an optimal frequency domain control method based on minimization of H2 norm of the system transfer function. In this study, the offshore platform is modeled numerically by use of the finite element method, instead of a lumped mass model. This structural model is later simplified to be single-degree-of-freedom (SDOF) system by extracting the first vibration mode of the structure. The corresponding "generalized" wave force is determined based on an analytical approximation of the first mode shape function, the physical wave loading being calculated from the linearized Morison equation. This approach facilitates the filter design for the generalized force. Furthermore, the present paper also intends to make numerical comparison between H2 active control and the corresponding passive control using a TMD with the same device parameters.

【基金】 This work was partly supported by the Japan Society for the Promotion of Science (JSPS) for RONPAKU program ; by Foundation for University Key Teacher by the Ministry of Education of China
  • 【文献出处】 China Ocean Engineering ,中国海洋工程(英文版) , 编辑部邮箱 ,2001年01期
  • 【分类号】O328
  • 【被引频次】27
  • 【下载频次】112
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