远海作业锚泊定位大型抓斗船时域耦合分析

在环境复杂、作业水深较大的远海开敞海域进行作业时,大型抓斗船需采用锚泊定位方式,且船体运动响应受风浪影响较大。同时,在抓斗提升和旋转过程中,抓斗运动速度快,提升质量大,抓斗出水时全船所受载荷发生瞬时变化,加上复杂环境载荷的作用,对船舶安全具有很大影响。以适用于远海开敞海域、采用锚泊定位方式的200m3级大型抓斗疏浚船为研究对象,建立了船舶的水动力计算模型,对其运动响应RAO和载荷RAO进行了计算分析。考虑船舶主体、抓斗及锚泊系统之间耦合作用的影响,对抓斗作业时提升和旋转过程中船舶运动响应和锚泊线张力进行时域动力分析,得到了该船动力载荷结果,为后续的设计工作提供基础。

Time-domain Coupling Analysis of Large Grab Dredger with Mooring System in Open Sea

When working in the open sea with complex environment and deep water, the large grab dredger should use mooring positioning system. AndSthe ship motion responseSaffected by waves and winds. During the lifting and turning operations of grab bucket, the stability and safety of ship are affected significantly by the complex environmental loading, the high moving speed of grab, and the transient fluctuation of loadingSon the whole ship structure. The research object of this study is a 200m₃ capacity large grab dredger with mooring system working in open sea. Ahydrodynamic model of this ship was established for calculation. The calculation of motion response RAO and load RAO were finished. Considering the coupling effect among the hull, grab and mooring system, the research on dynamic response analysis of ship and mooring lines, during elevating and rotating process, were performed. Provide important theoretical basis for the further structural calculation.