Research on Optimization Design of Dual Derrick for Offshore Platform Based on RSM

Abstract

The structure of dual derrick for offshore platform is optimized in this study. The special arrangement is establishing a mathematical model to minimize the stress and mass of dual derrick. The beam is divided into vertical, horizontal and oblique beam. The beam’s section sizes are design variables. After calculating test point data by ANSYS under operating conditions, the multi-objective optimization method is adopted to solve the optimal section size based on the regression equation of RSM fitting influence factors and response variables. This study will check the safety of the optimized dual derrick under storm self-storage conditions. The result shows that dual derrick meets safety requirements under extreme conditions, the optimized structure’s mass reduced about 21.2%, and the maximum safety factor increased about 8.3%.