| A Study on Crack Detection with Modal Parameters of A Jacket Platform |
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| 作者姓名： | 张兆德 王德禹 |
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| 作者单位： | SchoolofNavalArchitectureandOceanEngineering,ShanghaiJiaoTongUniversity,Shanghai200030,China |
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| 基金项目： | ThisresearchissupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .5 0 3790 2 5 )andbyTeach ingandResearchAwardProgram (2 0 0 2 )forOutstandingYoungTeachersinHigherEducationInstitutionsofMinistryofEducationP .R .China |
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| 摘 要： | Crack detection procedures by different modal parameters are analyzed for identitying a crack and its location and magnitude in a jacket plafform. The first ten natural frequencies and modal shapes of the jacket models are obtained by numerical experiments based on NASTRAN Code. A crack at different locations and of different magnitudes is imposed in the model at the underwater beams. Then, the modal evaluation parameters are calculated numerically, to illustrate the evaluation of modal parameter criteria used in jacket crack detection. The sensitivities of different modal parameters to different cracks are analyzed. A new technique is presented for predicting the approximate location of a breakage in the absence of the data of an intact model. This method can be used to detect a crack in underwater menbers by use of incomplete mode shapes of the top members of the jacket.
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| 关 键 词： | 损失探测 建筑损伤 基线 动力学特征 使用寿命 沥青铀矿 编码 |
A Study on Crack Detection with Modal Parameters of A Jacket Platform |
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| ZHANG Zhao-de and WANG De-yu School of Naval Architecture and Ocean Engineering,Shanghai Jiao Tong University,Shanghai ,China.A Study on Crack Detection with Modal Parameters of A Jacket Platform[J].China Ocean Engineering,2004,18(1):1-10. |
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| Authors: | ZHANG Zhao-de and WANG De-yu School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai China |
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| Institution: | ZHANG Zhao-de 1 and WANG De-yu School of Naval Architecture and Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200030,China |
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| Abstract: | Crack detection procedures by different modal parameters are analyzed for identifying a crack and its location and magnitude in a jacket platform. The first ten natural frequencies and modal shapes of the jacket models are obtained by numerical experiments based on NASTRAN Code. A crack at different locations and of different magnitudes is imposed in the model at the underwater beams. Then, the modal evaluation parameters are calculated numerically, to illustrate the evaluation of modal parameter criteria used in jacket crack detection. The sensitivities of different modal parameters to different cracks are analyzed. A new technique is presented for predicting the approximate location of a breakage in the absence of the data of an intact model. This method can be used to detect a crack in underwater members by use of incomplete mode shapes of the top members of the jacket. |
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| Keywords: | jacket crack detection modal parameter FEM |
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