The reliability analysis and experiment verification of pressure spherical model for deep sea submersible based on data BP and machine learning technology

• Published in: Marine structures Vol. 96; p. 103635
• Main Authors: Du, Qinghai, Liu, Wei, Zou, Guang, Qiu, Xiangyu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2024
• Subjects: BP neural network; Deep-sea spherical hull; Experimental verification; Genetic algorithm; Monte Carlo simulation; BP neural network; Deep-sea spherical hull; Genetic algorithm; Experimental verification; Monte Carlo simulation
• ISSN: 0951-8339; 1873-4170
• DOI: 10.1016/j.marstruc.2024.103635

Spherical pressure-resistant shells, as a universal structural component of deep-sea submersibles, provide a safe and normal operating environment for personnel and internal equipment. In the paper it presented and optimized the BP neural network model based on a genetic algorithm (GA) accordingly, and the method and accuracy are validated through by a beam model. Simultaneously focusing on steel spherical shells, the study proposed a dataset that captures the influence of the primary dimension of the shell (radius-to-thickness ratio, R/t) on the critical pressure response. The genetic algorithm is employed to optimize the back propagation (BP) neural network model for predicting critical pressure. The structural reliability is adopted as a design criterion to determinate and optimize the geometric parameters and critical pressure of the spherical shell structure. Finally, an ultra-high-strength steel spherical model is designed, constructed and meanwhile collapse pressure tests are accomplished to verify the accuracy of the presented improved BP neural network model based on the computational reliability method. The results reveal that the machine learning optimization design method proposed in this paper can effectively enhance the accuracy of critical pressure predictions and the precision of reliability assessments for deep-sea spherical shells. •An optimized BP neural network model based on a genetic algorithm accordingly is proposed, and its accuracy is validated by a beam model.•An improved BP neural network model based on the reliability method (CV-GA-BP-MCS) is presented and confirmed accordingly.•A deep-sea ultra-strength steel spherical model designed by CV-GA-BP-MCS has been designed, tested and verified respectively.