涌浪环境下大型起重船吊装上部组块耦合运动响应模型试验研究

Experimental study on the coupled motion responses of the topside structure while lifting it with large scale crane vessel in the swell environment

针对东海海域涌浪环境,选用“蓝鲸”号起重船为研究对象,开展了系泊情况下吊装上部组块运动响应的水池模型试验研究。采用双峰谱不规则波模拟涌浪,针对不同吊高参数测量起重船和上部组块的耦合运动响应;采用谱分析方法对能量频谱分布特性进行了研究,并与单谱峰波浪下的运动响应进行了对比,揭示了其耦合响应机理。研究发现涌的长周期容易接近上部组块的纵荡自振周期,会引起上部组块的纵荡共振,导致上部组块纵荡运动剧烈,不能满足安全作业的要求。研究成果可为涌浪环境下系泊起重船吊装组块作业提供指导,提高海洋平台的安装施工效率以及作业安全性。

Aiming at the swell environment in the East China Sea,with the mooring crane vessel“Lanjing”as the study object,model tests were carried out in the wave basin to study the motion responses during the topside lifting operation.The double-peaked spectrum irregular waves were used to simulate the swells in the East China Sea.For different lifting heights,the coupled motion responses of the crane vessel and the topside structure were measured.The energy spectrum distribution characteristics were studied by the spectral analysis,by comparing the results with the motion responses under the unimodal spectrum wave,it is able to reveale the mechanisms of the coupled motions.The results indicate that the long period of swell is prone to approximating the surge natural period of top structure and can cause its surge resonance,resulting in the excessive motions of top structure,which doesn't meet the operation requirements.The results can provide guidance for the lifting operation of mooring crane vessels in swell waves and are beneficial to improving the efficiency and safety of top structure installation.