| Dynamic Response Analysis of Risers Subjected to Combined Wave and Current Loading |
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| 作者单位： | Nie Wu，Yu Xiukun Ma Chunyan Li Weiyang Associate Professor，Harbin Shipbuilding Engineering Institute，Harbin 150001 Research Staff，Harbin Shipbuilding Engineering Institute，Harbin 150001 Professor，Harbin Shipbuilding Engineering Institute，Harbin 150001 |
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| 摘 要： | A dynamic response analysis in the frequency domain is presented for risers subjected to combined wave and current loading. Considering the effects of current, a modified wave spectrum is adopted to compute the linearized drag force. An additional drag force convolution term is added to the linearized drag force spectrum, therefore the error is reduced which arises from the truncation of higher order terms in the drag force auto-correlation function. An expression of linearized drag force spectrum is given taking the relative velocity into account. It is found that the additional term is a fold convolution integral. In this paper dynamic responses of risers are investigated, while the influence of floater motion on risers is considered. The results demonstrate that the accuracy of the present method reaches the degree required in time domain analysis.
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Dynamic Response Analysis of Risers Subjected to Combined Wave and Current Loading |
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| Authors: | Nie Wu Yu Xiukun Ma Chunyan Li Weiyang Associate Professor Harbin Shipbuilding Engineering Institute Harbin Research Staff Harbin Shipbuilding Engineering Institute Harbin Professor Harbin Shipbuilding Engineering Institute Harbin |
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| Institution: | Nie Wu,Yu Xiukun Ma Chunyan Li Weiyang Associate Professor,Harbin Shipbuilding Engineering Institute,Harbin 150001 Research Staff,Harbin Shipbuilding Engineering Institute,Harbin 150001 Professor,Harbin Shipbuilding Engineering Institute,Harbin 150001 |
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| Abstract: | A dynamic response analysis in the frequency domain is presented for risers subjected to combined wave and current loading. Considering the effects of current, a modified wave spectrum is adopted to compute the linearized drag force. An additional drag force convolution term is added to the linearized drag force spectrum, therefore the error is reduced which arises from the truncation of higher order terms in the drag force auto-correlation function. An expression of linearized drag force spectrum is given taking the relative velocity into account. It is found that the additional term is a fold convolution integral. In this paper dynamic responses of risers are investigated, while the influence of floater motion on risers is considered. The results demonstrate that the accuracy of the present method reaches the degree required in time domain analysis. |
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| Keywords: | riser dynamic response wave and current loading additional drag force convolution term |
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