Modeling and optimization design method of variable stiffness composite cylindrical shell

Abstract

The invention discloses a modeling and optimization design method of a variable stiffness composite cylindrical shell. The method comprises the following steps: performing unit discretization design on a geometric model of a cylindrical shell; endowing discrete units of the geometric model of the cylindrical shell with attributes of the variable stiffness composite material; carrying out variableangle parameter assignment on discrete units in the model, and establishing a finite element analysis model; and performing a small amount of finite element analysis on the parameterized analysis model of the discrete unit in the model, extracting sample points, and establishing an approximate model of buckling analysis and optimization design. According to the modeling and optimization design method, through a discrete finite element method and parametric programming, establishment of a simulation analysis model of the variable stiffness composite cylindrical shell is achieved, and a neural network approximation model is introduced in the design optimization process; rapid response analysis and optimization design of the mechanical property of the cylindrical shell are conducted with thefiber laying start-stop angle and the laying layer number sequence as variables, and the optimization design efficiency in application of the underwater pressure-resistant cylindrical shell is greatlyimproved.

Description

technical field [0001] The invention relates to the technical field of modeling of a composite material revolving body, in particular to a modeling and rapid optimization design method for a variable stiffness composite material cylindrical shell. Background technique [0002] As the core component of an underwater vehicle, the cylindrical pressure-resistant shell not only needs to have greater strength and higher stability to ensure the safety of its internal instruments and equipment, but also must have a greater buoyancy / gravity ratio for underwater vehicles. Provides buoyancy reserve. Compared with the traditional isotropic, such as high-strength steel, aluminum alloy, titanium alloy and other pressure-resistant shell structures, the composite material pressure-resistant shell has the advantages of light weight, high specific stiffness, high specific strength, good corrosion resistance, and structural It has the characteristics of designability, low noise and good conce...

AI Technical Summary

Problems solved by technology

In terms of simulation modeling and analysis of variable stiffness composite pressure shells, the continuously changing fiber layup angle and the uncertainty of various path laying methods make it difficult to directly rely on existing commercial software to build variable stiffness structures. On the other hand, the optimal design process of variable stiffness composite structures is usually based on repeated finite element calculations and iterations to find the optimal solution, so the design analysis cycle is long and the efficiency is not high

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