Small wave height, long wave period swells often occurin the East China Sea. The swell will influence the lift operation of the offshore platform topside. The motion responses in swells are larger than those in normal waves. This has a serious impact on the installation efficiency of offshore platformsand even threatens operational safety. Numerical simulation is carried out on the coupling motions of themooringsystem- large crane ship (including crane rigging) - large topside usingcommercial hydrodynamic code. The sensitivity analysis is studied to investigate the factors which have much influence on the coupling responses. Finally, recommendations are proposed to reduce the motion responses during lifting operations in swells.%我国东海海洋环境复杂,经常出现小波高、长周期的涌浪.长周期涌对系泊大型起重船吊装海洋平台上部组块影响比较大,尽管涌的波高较小,但是,吊物组块运动幅度明显比同等波高海况时的要大,严重影响了海洋平台的安装施工效率和进度,甚至威胁作业安全.本文采用水动力势流软件,建立系泊-大型起重船(包括吊臂)-索具-大型组块吊物的耦合运动模型,研究复杂涌浪环境下耦合系统运动响应特性及其机理,并开展了参数敏感性分析,讨论对耦合响应影响因素.最后,对东海涌浪情况下起重安装施工,提出了降低吊装组块运动响应的建议措施.
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