| Semi-Active Control of Wave-Induced Vibration for Offshore Platforms by Use of MR Damper |
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| 作者姓名： | Li Huajun |
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| 作者单位： | College of Engineering，Ocean University of Qingdao，College of Engineering，Ocean University of Qingdao，College of Engineering，Ocean University of Qingdao Qingdao 266071，China，Qingdao 266071，China，Qingdao 266071，China |
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| 摘 要： | The objective of the present research is to examine the effectiveness of the lateral vibration control of wave-excited re-sponse of offshore platforms with magnelo-rheological (MR) damper, In this study, the offshore platform is simplified to be a single-degree-of-freedom (SDOF) system by extracting the first vibration mode of the struclure. The exlernal 'generalized' wave force is determined with a white noise via a designed filler. A semi-active control method based on optimal control the-ory is proposed considering that the yield stress of the MR damper can be varied continuously within a certain range. The dy-namics of SDOF structure coupled with the MR damper is investigated. Numerical simulation demonstrates that the MR damper with this control strategy can significantly reduce the maximum responses and the root-mean-square (RMS) values.
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Semi-Active Control of Wave-Induced Vibration for Offshore Platforms by Use of MR Damper |
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| LI Huajun,WANG Shuqing and JI Chunyan
College of Engineering,Ocean University of Qingdao,Qingdao ,China.Semi-Active Control of Wave-Induced Vibration for Offshore Platforms by Use of MR Damper[J].China Ocean Engineering,2002,16(1):33-40. |
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| Authors: | LI Huajun WANG Shuqing and JI Chunyan
College of Engineering Ocean University of Qingdao Qingdao China |
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| Institution: | College of Engineering, Ocean University of Qingdao, Qingdao 266071 , China College of Engineering, Ocean University of Qingdao, Qingdao 266071 , China College of Engineering, Ocean University of Qingdao, Qingdao 266071 , China |
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| Abstract: | The objective of the present research is to examine the effectiveness of the lateral vibration control of wave-excited re-sponse of offshore platforms with magnelo-rheological (MR) damper, In this study, the offshore platform is simplified to be a single-degree-of-freedom (SDOF) system by extracting the first vibration mode of the struclure. The exlernal 'generalized' wave force is determined with a white noise via a designed filler. A semi-active control method based on optimal control the-ory is proposed considering that the yield stress of the MR damper can be varied continuously within a certain range. The dy-namics of SDOF structure coupled with the MR damper is investigated. Numerical simulation demonstrates that the MR damper with this control strategy can significantly reduce the maximum responses and the root-mean-square (RMS) values. |
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| Keywords: | semi -active control offshore platform vibration reduction wave loading magneto- rheological damper |
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