Study Of Collaborative Optimization On Cylindrical Shell Subjected To Underwater Explosion Shock Waves

Cylindrical shell is a form of basic structure of submarines and other underwaterpressure-resistant structures. Cylindrical shell was subjected to hydrostatic pressure andunderwater explosion shock waves.Design optimization of cylindrical shell which subjectedto underwater explosion shock waves in deep water is a very complicated task because itincludes static and dynamic disciplines that they are highly interdependent and interacted.But up to now, the optimization of cylindrical shell structures was done on the base ofsingle discipline. It is meaningful to use static and dynamic collaborative optimization (CO)in a cylindrical shell structural subjected to underwater explosion shock waves in deepwater optimization design.Static and dynamic collaborative optimization model of cylindrical shell structure isconstructed in this paper for combined static and dynamic properties. There are differentobjective functions in various subsystem-level optimization models. In system-leveloptimization model, the objective function is minimum relative deviation between thecollaborative objective function and subsystem-level’s. A bilevel optimization strategy isproposed which uses the Multi-Island Genetic Algorithm. Then, a cylindrical shell isimplemented with static and dynamic collaborative optimization model and strategy.The content and conclusions are as follows:(1) Analyze the propagation of the underwater explosion pressure, elaborated themultidisciplinary design optimization (MDO) methods, focus on collaborative optimizationin the MDO.(2) The3D finite element model of a cylindrical shell was built. Structural strength isanalyzed and the dynamic response of the structures subjected underwater explosionloading is studied.(3) The structural quality was selected as the optimization objectives, establish staticstructure optimization model based on the multi-island genetic algorithm to cylindrical shellin deep water. Effectively reduce the quality of the structure and by optimizing and reducethe project cost.(4) The largest deformation was selected as the optimization objectives, establishdynamic structure optimization model based on the multi-island genetic algorithm tocylindrical shell subjected underwater explosion shock waves. The maximum deformation of the structure was reduced by optimizing and improve the structure of the antiknockperformance.(5) The model comprehensive consideration static and dynamic response wasconstructed. Multi-island genetic algorithms was used in the system-level anddiscipline-level. Static and dynamic collaborative optimization model was used in acylindrical shell which subjected to underwater explosion shock waves in deep wateroptimization design. The result shows the model is feasible and suitable for optimization ofengineering structures. The CO results are better than single discipline individuallyoptimized results with a very good theoretical and practical significance.