Instability Assessment of Deep-Sea Risers Under Parametric Excitation

作     者：杨和振 李华军 

作者机构：State Key Laboratory of Ocean EngineeringShanghai Jiao Tong University College of EngineeringOcean University of China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2009年第23卷第4期

页      面：603-612页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0908[农学-水产] 08[工学] 0707[理学-海洋科学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Key Natural Science Foundation of China(Grant No.50739004) the Research Fund for the Doctoral Program of Higher Education(Grant No.20070248104) 

主　　题：deep-sea riser parametric excitation instability vibration response 

摘      要：This study deals with the nonlinear dynamic response of deep-sea risers subjected to parametric excitation at the top of a platform. As offshore oil and gas exploration is pushed into deep waters, difficulties encountered in deep-sea riser design may be attributed to the existence of parametric instability regarding platform heave motions. Parametric resonance in risers can cause serious damage which might bring disastrous accidents such as environment pollution, property losses and even fatalities. Therefore, the paranletric instability analysis should attract more attention during the design process of deep-sea risers. In this work, an equation of motion for a deep-sea riser is derived firstly. The motion equation is analyzed by the Floquet theory which allows the determination of both system response and stability properties. The unstable regions in which parametric resonance easily occurs can be determined. The effects of damping on parametric instability are also investigated, and the stability maps are presented. The results demonstrate that the available damping is vital in suppressing the instability regions. The suggestions for reduction of instability regions are proposed in deep-sea riser design.