动力定位系统推力能力曲线计算分析

Thrust ability evaluation analysis of a dynamic positioning system

推力能力曲线与传统的动力定位能力评估结果不同,它显示着动力定位作业控制时推进系统的推力可执行域。文章通过对动力定位系统仅在力矩平衡约束下的最大推力进行求解,计算了推力能力曲线,并结合相关算例对推力能力曲线的应用进行了分析研究。研究结果表明推力能力图线尽管对于环境载荷的估算依赖很小,但对动力定位能力仍有着很好的反映。而且在动力定位作业控制时,它不但能反映动力定位系统当前的工作状态,同时对可能出现的一些临界状态做出预判,给动力定位系统操控人员提供很好的指导建议。

Thrust ability analysis is different from the conventional dynamic positioning（DP） capability analysis. It mainly expresses the thrust feasible region of a thruster system during DP operations. In this paper,thrust ability analysis of a DP system is presented. Based on the constraint of moment balance, the maximum resultant force of thrust system is calculated and the thrust ability plot is obtained spontaneously.Some examples are demonstrated to investigate its effects on DP operations. The results show that although thrust ability program depends on the environmental force evaluation little, it also can reflect dynamic capability of DP system. Furthermore, during dynamic positioning operation, it can reflect DP system current status, and can predict critical status, and give DP system operator some useful suggestions.