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Numerical analysis method for connection between three-dimensional and two-dimensional finite element units

A technology of unit connection and numerical analysis, applied in image data processing, electrical digital data processing, special data processing applications, etc., can solve problems such as mismatching of degrees of freedom, increase of analysis time and cost, and achieve analysis time and cost. Time-saving and cost-effective analysis

Inactive Publication Date: 2015-06-10
CHINA AIRPLANT STRENGTH RES INST
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Problems solved by technology

Therefore, when connecting plate elements or beam elements to volume elements, there is often a problem of mismatching degrees of freedom
The existing solution is to use all three-dimensional elements for analysis, which leads to a significant increase in analysis time and cost

Method used

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  • Numerical analysis method for connection between three-dimensional and two-dimensional finite element units
  • Numerical analysis method for connection between three-dimensional and two-dimensional finite element units
  • Numerical analysis method for connection between three-dimensional and two-dimensional finite element units

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] When establishing the finite element model, the three-dimensional unit and the two-dimensional unit are connected by rigid body elements, so as to realize the purpose of organically coupling the translational degree of freedom of the three-dimensional unit and the rotational degree of freedom of the two-dimensional unit.

[0014] (1) Construct three-dimensional elements (volume elements) and two-dimensional elements (plate elements and beam elements) at the actual position of the structure, and endow the three-dimensional element with rotational degrees of freedom for simulation at the connection between the three-dimensional element and the two-dimensional element. The rigid body element establishes the connection relationship between the 2D unit and the new 3D unit.

[0015] For the connection of plate elements and volume elements, two rigid body ele...

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Abstract

The invention provides a numerical analysis method for the connection between three-dimensional and two-dimensional finite element units, and aims to save time and reduce analysis cost by replacing part of a test result with numerical simulation. The numerical analysis method is characterized by comprising the following steps: (1) constructing a three-dimensional unit and a two-dimensional unit at actual structure positions respectively, endowing the three-dimensional unit with a simulated rotating freedom degree at the connection between the three-dimensional unit and the two-dimensional unit, and establishing a connection relationship between the two-dimensional unit and a new three-dimensional unit by virtue of a rigid body element; (2) creating a card required by structure analysis according to a connection form and a constraint relationship of the rigid body element; (3) creating a unit rigidity matrix according to the card required by analysis, assembling the unit rigidity matrix with other unit rigidity matrixes of the structure to form an overall rigidity matrix, and creating structure deformation and unit stress distribution according to a structure load and a boundary condition.

Description

technical field [0001] The invention belongs to numerical simulation technology, and relates to a three-dimensional unit model and a two-dimensional unit model in structural finite element analysis. Background technique [0002] In aircraft structural modeling, in order to better express the force transmission and detailed stress state of the structure, 3D elements (volume elements) and 2D elements (plate elements, beam elements, etc.) are often used at the same time. The nodes of voxels have only translational degrees of freedom and do not provide stiffnesses corresponding to rotational degrees of freedom, but both plate and beam elements have stiffnesses corresponding to rotational degrees of freedom (although plate elements may not have normal rotational stiffness). The inconsistency of the rigid matrix of this kind of unit will lead to the problem of mismatching degrees of freedom when the plate and beam units are connected with the body unit. Both plate and beam elemen...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
Inventor 常亮王立凯张国凡
Owner CHINA AIRPLANT STRENGTH RES INST
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