Modeling Analysis and Reliability Optimization Design Method of Variable Stiffness Composite Shell Structure

Abstract

The invention relates to the field of structural reliability optimization, and provides a variable stiffness composite material plate shell structure modeling analysis and reliability optimization design method, including: using the first-order reliability approximation method, the nonlinear approximation function and the second-order reliability approximation method to The variable stiffness composite shell structure is optimized for high efficiency and reliability. Use non-uniform rational B-spline function to accurately model the fiber laying path of the variable stiffness composite plate and shell; conduct isogeometric analysis of the variable stiffness plate and shell structure, including: linear buckling analysis of the variable stiffness plate and shell structure based on the isogeometric method , to derive the full analytical sensitivity of the design variables and random variables to the structural response. The invention can realize the seamless connection of modeling, analysis and reliability optimization of the variable stiffness composite material plate and shell structure, significantly improve the reliability optimization efficiency and accuracy, and greatly shorten the research and development period.

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, making the design Space is limited. In contras...

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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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