深海半潜式平台不同构型的运动性能

Motion performance of different types of semisubmersible platforms in deep water

深海半潜式平台的运动性能预报是平台方案设计阶段的重要工作,而平台性能的优劣主要取决于水下的浮体构型。通过对国外主推的半潜平台设计方案进行构型特点分析,分别对立柱、连接横撑以及下浮筒进行多方案设计,共组合得到8个平台设计方案。应用数值方法首先对A1方案完成性能计算,并与该平台的模型试验结果对比,验证了理论预报的可靠性。基于该理论方法,分别完成了8个平台方案的系列水动力性能预报,并采用指标权重法得到了各个平台方案的综合运动效能,通过对比分析,明确了不同构型对于运动性能的影响规律。研究表明:浮体构型对于半潜式平台的运动性能有较大影响,且尖角型浮筒、变截面立柱及圆管型横撑的构型具有更优的综合运动性能。

The motion performance of semisubmersible platforms is of vital importance during the concept design stage, and the performance is largely decided by the floater＇s type. By analyzing the floater＇s characteristics of major foreign semisubmersible platforms, this paper establishes eight design schemes for pontoon, column, and bracing, and applies the numerical method to hydrodynamic performance calculation for scheme-A1. The result＇s credibility is further verified through model experiments. Based on this theory, the motion performance of the eight platform schemes are predicted respectively, and the comprehensive performance is then obtained with the method of weighting. Through comparison, it is concluded that the floater has great influence on the motion performance, and sharp pontoon, tapered column, and tubular bracing types demonstrate better comprehensive performance. In brief, the research provides a worthy reference for the type selection of semisubmersible platforms during the concept design stage.