A Thrust Allocation Method for Efficient Dynamic Positioning of a Semisubmersible Drilling Rig Based on the Hybrid Optimization Algorithm

Table 1

Summary of related studies and comparison with this study.

Studies	Application	Optimization algorithm	Design variables for formulation	Consideration of thruster interaction
Wit [5]	Ship	Local algorithm (QP)	Thrust and azimuth direction	◯
Liang and Cheng [6], Johansen et al. [7]	Ship	Local algorithm (SQP)	Thrust and azimuth direction	×
Parikshit [8]	Drilling rig	Global algorithm (GA, ITHS, etc.)	Thrust and azimuth direction	◯
Zhao et al. [9]	Drilling rig	Global algorithm (GA)	Thrust and azimuth direction	◯
This study	Drilling rig	Global algorithm (hybrid optimization algorithm)	Rotation speed and azimuth direction	◯