Collaborative optimization of a composite pressure cylindrical shell based on dynamic penalty functions

This article reports the design and optimization of pressure cylindrical shells comprising carbon/epoxy and glass/epoxy composite materials. It presents a method for analyzing the pressure cylindrical shells of composite materials, analyzes the strength and buckling of composite pressure cylindrical shells with different rib numbers, and investigates the influence of thickness and ply angles ([+/-theta]10 and [903(+/-theta)2903]) on the critical buckling and strength-failure stresses. An approximate model of composite pressure cylindrical shells and collaborative optimization based on dynamic penalty functions are combined into a multidisciplinary optimization framework of composite pressure cylindrical shells. The optimization aims to maximize the critical buckling stress while minimizing the buoyancy coefficient. At a buoyancy coefficient similar to that of the initial scheme, the critical buckling stresses of the carbon/epoxy and glass/epoxy cylindrical shells increased by 21.85% and 9.5%, respectively, verifying the effectiveness of the collaborative optimization framework based on dynamic penalty functions.