Finite element modeling and correcting method and system for structure with connection relationship

A connection relationship, finite element technology, applied in the aerospace field, can solve problems such as poor approximation effect

Active Publication Date: 2021-04-20
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the optimization target of this algorithm is the weighted value of multi-order modal frequencies, which will result in the best correction effect on a certain order, but poor approximation effect on natural frequencies of other orders.

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  • Finite element modeling and correcting method and system for structure with connection relationship
  • Finite element modeling and correcting method and system for structure with connection relationship
  • Finite element modeling and correcting method and system for structure with connection relationship

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[0040] In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.

[0041] see figure 1, the research object of the embodiment of the present invention is this kind of structure with connections, shown as three cylindrical shell structures connected by screw structures. Since there is a large difference between the stiffness of the threaded structure and the stiffness of the material, it can b...

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Abstract

The invention discloses a finite element modeling and correcting method and system for a structure with a connection relationship. The method comprises the following steps: establishing an initial finite element model of the structure with the connection relationship; carrying out a modal test on the structure with the connection relationship; performing simulation calculation on the finite element model to obtain a simulation result; comparing the simulation result with the test result to obtain a result error; using an optimization algorithm to transmit a result error, correcting the connection layer grid, and performing simulation calculation on the corrected finite element model to obtain a corrected simulation result; and iterating to a preset convergence condition to obtain a corrected final finite element model, and completing finite element modeling and correction. According to the method, equivalent modeling is carried out on a connection part in an engineering structure by adopting a connection layer grid, and grid parameters are corrected by adopting a multi-target particle swarm algorithm to obtain an accurate finite element model.

Description

technical field [0001] The invention belongs to the field of aerospace technology, in particular to a method and system for correcting a finite element model based on a multi-objective particle swarm algorithm. Background technique [0002] For large-scale practical engineering projects, due to the existence of various connection relationships in the structure, the modeling error of the connection structure will cause the obtained model to fail to describe the dynamic characteristics of the structure well. Therefore, it is very difficult to use a single finite element modeling method. It is difficult to accurately obtain the dynamic parameters of complex structures. An effective solution is to conduct correlation analysis between the modal parameters with high reliability obtained through the test and the modal parameters obtained by the finite element simulation, and modify and optimize the original finite element model according to the results of the correlation analysis u...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/23G06F30/27G06N3/00G06F111/10
CPCY02T10/40
Inventor 董龙雷吴有福李宇东严健唐攀涛
Owner XI AN JIAOTONG UNIV
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