Complex structure finite element model correction method based on multistage super units

A technology for model correction and complex structures, applied in 3D modeling, image data processing, instruments, etc., can solve problems such as long correction time and difficult calculations, and achieve the effect of improving efficiency

Active Publication Date: 2019-08-30
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problems that the correction time is too long and the calculation is difficult due to the large scale of the large-scale complex structure model, the present invention provides a complex structure based on multi-level superunits The finite element model correction method, based on multi-level super-element modeling, performs model correction, which effectively improves the efficiency of finite element model correction

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  • Complex structure finite element model correction method based on multistage super units
  • Complex structure finite element model correction method based on multistage super units
  • Complex structure finite element model correction method based on multistage super units

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Embodiment

[0079] A method for correcting complex structure finite element models based on multilevel superelements, comprising the following steps:

[0080] (1) Establish an initial finite element model, and divide the initial finite element model into multi-level super-element finite element models; the specific division steps include:

[0081] (1.1) Taking the planetary gear train and the supporting shaft as the research object, including a sun gear, four planetary gears, an inner ring gear and a supporting shaft; the geometric parameters of the planetary gear train are shown in Table 1, and its overall structure is steel Material, elastic modulus E=190000MPa, Poisson's ratio μ=0.3, density ρ=7500kg / m 3 ; In the commercial finite element software Hypermesh, the hexahedron element is used for modeling, figure 2 The finite element model of the structure is shown; a total of 57492 nodes and 45485 elements are established; the full model is defined as a finite element model including al...

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Abstract

The invention discloses a complex structure finite element model correction method based on multi-stage super units, which comprises the following steps of establishing an initial finite element model, and dividing the initial finite element model into multi-stage super unit finite element models; carrying out condensation polymerization on the multi-stage super-unit model by adopting a modal synthesis method, carrying out condensation polymerization on the super-units to obtain a mass matrix and a rigidity matrix, assembling the obtained mass matrix and the obtained rigidity matrix to a residual structure, and carrying out modal analysis on the residual structure to obtain a modal shape and an inherent frequency; and measuring a test mode of an actual structure, constructing a residual error of a test inherent frequency and the inherent frequency obtained by modal analysis by adopting a perturbation method, establishing an objective function, and realizing the model correction by optimizing a reverse problem solution. According to the present invention, on the basis of the initial finite element model, the multi-stage super-unit modeling analysis is firstly carried out, and an appropriate structure is selected as the residual structure, and the modal analysis is carried out on the residual structure, and the model correction is carried out on the residual structure, so that the finite element model correction efficiency is effectively improved.

Description

technical field [0001] The invention relates to a finite element model correction method, in particular to a complex structure finite element model correction method based on multi-level super-units. Background technique [0002] For engineering structures such as transmission systems, it is often necessary to quickly and accurately analyze the dynamic characteristics of the entire structure, so there is an urgent need to improve calculation accuracy and efficiency, and mathematical modeling analysis is the most critical part of structural dynamic analysis. Due to the increasing size and complexity of engineering structures and some factors in the modeling process, such as element types, material properties, and geometric shapes, there are often certain errors that affect the accuracy of analysis results. Therefore, it is a very difficult task to establish a refined finite element model of a complex structure and perform accurate calculation and analysis. [0003] Therefore...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/20
CPCG06T17/20G06F30/17G06F30/23Y02T90/00
Inventor 姜东曹鑫费庆国曹芝腑张大海李彦斌
Owner SOUTHEAST UNIV
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