Integrated design method of accurate modeling analysis and reliability optimization for variable stiffness composite plate shell structure

Abstract

The present invention relates to the field of structural reliability optimization, and provides an integrated design method of accurate modeling analysis and reliability optimization for a variable stiffness composite plate shell structure. The method comprises: using a primary reliability approximation method, a non-linear approximate function and a secondary reliability approximation method to carry out high reliability optimization on the variable stiffness composite plate shell structure; using a non-uniform rational B-spline function to carry out accurate modeling on the fiber lay-up path of the variable stiffness composite plate shell; and carrying out equal geometric analysis on the variable stiffness composite plate shell structure, wherein the step comprises: carrying out linear buckling analysis on the variable stiffness composite plate shell structure based on the equal geometric method, and deriving full design sensitivity of the design variables and random variables on the response to the structure. According to the method provided by the present invention, seamless docking of modeling, analysis and reliability optimization for the variable stiffness composite plate shell structure can be realized, the reliability optimization efficiency and accuracy of the method can be obviously improved, and the development cycle can be significantly shortened.

Description

technical field [0001] The invention belongs to the technical field of structural mechanics analysis methods and structural reliability optimization design, and relates to an integrated design method of precise modeling analysis and reliability optimization of variable stiffness composite material plate and shell structures. Background technique [0002] The pursuit of performance first in aerospace structures makes it a battlefield for the first experiment and transformation of advanced composite material technology. Increasing the amount of composite materials plays a vital role in promoting the lightweight and high performance of aerospace equipment. Constrained by the traditional manufacturing process, fiber-reinforced composite laminates are usually formed by laying parallel and straight fibers, and the angle of the fibers in the same layer is fixed. In engineering, the lay-up directions of 0°, 90° and ±45° are often used, so that the design Space is limited. In contra...

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Problems solved by technology

[0005] The invention mainly solves the technical problems of poor modeling and analysis accuracy of variable stiffness composite material plate and shell structure in the prior art, huge calculation cost of reliability optimization design, poor precision, and low optimization efficiency, and proposes a variable stiffness composite material plate and shell The integrated design method of precise structural modeling analysis and reliability optimization realizes the seamless connection of modeling, analysis and reliability optimization, so as to improve the modeling accuracy of variable stiffness composite plate and shell structure and improve the reliability optimization design. Calculation efficiency, calculation accuracy, and the purpose of shortening the product design cycle

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