Dynamic Response Analysis of Risers Subjected to Combined Wave and Current Loading  

作　　者：Nie, Wu  Yu, Xiukun  Ma, Chunyan  Li, Weiyang 

机构地区：[1] Harbin Shipbuilding Engineering Inst, Harbin, China

出　　处：《China Ocean Engineering》1993年第2期147-156,共10页中国海洋工程（英文版）

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.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.

关 键 词：Drag Dynamic loads Dynamic response Frequency domain analysis Loads (forces) Ocean currents Spectrum analysis Time domain analysis VELOCITY Water waves 

分 类 号：P7[天文地球—海洋科学]