Optimal design method for stiffened plate structure

Abstract

The invention discloses an optimal design method for a stiffened plate structure. The optimal design method comprises the following steps of: building a free vibration equation of the stiffened plate structure, identifying parameters of the stiffened plate structure, if the parameters are unchanged parameters, identifying the parameters to be known parameters, giving specific parameter values, setting the residual parameters to be parameters to be optimized, giving an optimization range, setting an optimization target with a fixed frequency of the stiffened plate structure, selecting a proper optimization algorithm, performing optimal solution search on the set parameters to be optimized according to the free vibration equation so that the stiffened plate structure obtains a parameter value closest to the optimization target, and forming a stiffened plate according to a parameter optimization result. By the method, the optimal design for the stiffened plate structure can be instructed under any boundary condition; a desired structure fixed vibration frequency can be obtained by properly adjusting the parameters; one or more of the parameters can be selected as optimization parameters for optimization; optimal values of the parameters can be automatically and quickly found; and the structure optimization target close to a user desired value can be finally fulfilled.

Description

technical field [0001] The invention relates to an optimal design method of a stiffened plate structure. Background technique [0002] Stiffened plate structure is one of the most common structures in engineering, and is widely used in ship and ocean engineering, aerospace engineering, civil engineering, vehicle engineering and other structures. Among them, the design parameters of the stiffener (including the number, material, size and location of the stiffener) have an important influence on the static and dynamic characteristics of the stiffened plate structure. In order to obtain the optimal performance of the stiffened plate structure, many scholars have studied the optimal design of the stiffened strip in recent years. [0003] W.Akla, et al, "Optimization of the static and dynamic characteristics of plates with isogrid stiffeners", Finite Elements in Analysis and Design, Vol.44(8), pp 513-523, 2008. The inclination angle of the ribs is used to improve the static and...

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Problems solved by technology

[0006] These emerging optimization methods provide good theoretical tools for improving the static and dynamic characteristics of stiffened plate structures, but there are still shortcomings: in the existing optimization methods, the influence of boundary conditions on stiffened plate structures is generally not considered Or simplify the boundary conditions to simplified conditions such as "fixed support" or "simply supported"

[0009] All in all, the above-mentioned optimization methods for stiffened plate structures are only proposed for several simple boundary conditions, and there are still great limitations in practical applications.

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