Optimization design of pressure hull structure based on MIGA algorithm

The optimization design of titanium alloy pressure shell structure is studied to meet the needs of lightweight and high reliability of deep-sea submersible, and the difficulties faced by titanium alloy pressure shell in engineering applications such as high cost, conflict of optimization objectives are analyzed. In this paper MIGA multi-objective optimization algorithm are used to achieve the collaborative optimization of minimizing structural mass and maximizing critical instability pressure. Firstly, samples are generated by Latin hypercube sampling method, finite element simulation and approximate model establishment are carried out, and sensitivity of design variables is analyzed. It is proved that the height of web plate has the greatest influence on stability, and shell thickness is the most sensitive to structure quality. Algorithms are used to obtain the Pareto optimal solution set of optimal solution, and the minimum distance method is used to determine the optimal solution. The effectiveness of the proposed method is verified.