Stiffened plate shell structure reliability optimization method with multisource uncertainty being considered

Abstract

The invention relates to the technical field of optimization design and provides a stiffened plate shell structure reliability optimization method with the multisource uncertainty being considered. The stiffened plate shell structure reliability optimization method with the multisource uncertainty being considered comprises the following steps of performing reliability optimization on a stiffened plate shell structure by utilizing an equivalent stiffness model; performing finite element analysis validation on every elite individual in a candidate solution set, wherein the finite element analysis validation comprises performing nonlinear post-buckling analysis on the stiffened plate shell structure comprising defects by utilizing a single-point disturbing load method with defect factors being considered to screen out the elite individuals satisfying a reliability constraint condition; performing the reliability optimization on the stiffened plate shell structure by utilizing a finite element model. The stiffened plate shell structure reliability optimization method with the multisource uncertainty being considered can improve the reliability optimization efficiency of the stiffened plate shell structure and reduce calculation costs.

Description

technical field [0001] The invention relates to the technical field of optimization design, in particular to a method for optimizing the reliability of a stiffened plate shell structure considering multi-source uncertainties. Background technique [0002] Since the 21st century, the United States, Russia, the European Union and other space powers have proposed corresponding deep space exploration plans. my country's "National Medium- and Long-term Science and Technology Development Plan (2006-2020)" has also clarified the future space station construction and manned space. There is an urgent need to develop heavy-duty launch vehicles with high thrust, which is of great significance to my country's economy, society and national security. The leapfrog improvement of the payload and launch efficiency of the launch vehicle has made thin-walled and lightweight the design trend of the key load-bearing components of the rocket, which has also resulted in the extreme axial compressio...

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Problems solved by technology

[0005] The present invention mainly solves the technical problems of high calculation cost and low optimization efficiency in the reliability optimization design of the stiffened plate and shell structure in the prior art, and proposes a reliability optimization of the stiffened plate and shell structure considering multi-source uncertainties method, in order to achieve the purpose of improving the calculation efficiency and reducing the calculation cost of the reliability optimization design of the stiffened plate shell structure

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