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Parameterization static state ultra-unit structuring method

A construction method and a technology of superunits, which are applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as long calculation time, heavy workload, and difficult optimization

Active Publication Date: 2008-10-01
深圳网蓝通用科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For some large and complex structures with a large number of continuous flat central openings, such as figure 1 As shown, the two sides of the plate are constrained and loaded, and there is stress concentration at the central hole. When performing finite element analysis on it, in order to obtain more accurate results at the opening, it is necessary to divide it into denser grids for calculation. Large amount, long calculation time, and it is not easy to optimize it

Method used

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  • Parameterization static state ultra-unit structuring method
  • Parameterization static state ultra-unit structuring method
  • Parameterization static state ultra-unit structuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] 1 superunit structure

[0101] Determine the basic size of the superelement as 0.3×0.2m; the long radius of the central opening is r1=0.07m, the short radius is r2=0.03m, and the solid182 unit is used; material properties: elastic modulus E=2e11Pa, Poisson’s ratio Pr = 0.3. Create a finite element model such as Figure 7 As shown, the total rigid point number of the superelement is as follows Figure 8 As shown, the single rigid point number of the central hole of the superelement is as follows Figure 11 shown. Nodes 1 to 17 are fully constrained, nodes 18 to 23 are loaded with a load of 800N in the x direction, nodes 24 to 34 are loaded with a load of 1000N in the x direction, and nodes 18 to 34 are loaded with a load of 1000N in the y direction.

Embodiment 2

[0103] 3 consecutive superunit structures

[0104] Adopt solid182 unit. Material properties: modulus of elasticity E=2e11Pa, Poisson's ratio Pr=0.3.

[0105] Central elliptical hole radius from left to right:

[0106] The first unit r1=0.06m, r2=0.04m;

[0107] The second unit r1=0.07m, r2=0.05m;

[0108] The third unit r1=0.10m, r2=0.06m.

[0109] Finite element models such as Figure 9 As shown, the overall total rigid point number is as follows Figure 10 As shown, the single rigid point number of the central hole of the superelement is as follows Figure 11 As shown, nodes 1 to 17 are fully constrained, nodes 52 to 60 apply a load of 800N in the x direction, nodes 61 to 68 apply a load of 1000N in the x direction, nodes 52 to 60 apply a load of 800N in the y direction, and nodes 61 to 68 Apply a load of 1000N in the y direction.

[0110] ANSYS calculation results and superelement calculation results such as Figure 12 , Figure 13, Figure 14.

[0111] It can be se...

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Abstract

The invention discloses a parameterized static super-unit construction method. The unit reduces the model freedom by the substructure method, then parameterizing various sizes of the structure; fits rigidity matrix K and strain matrix B to construct the super-unit that has a small number of nodes, so that considerable computing time is saved for easy optimization and the guaranteed accuracy of calculations. Based on the construction method for the super-unit, various super-units with computational complexity greatly reduced are constructed.

Description

technical field [0001] The invention relates to the fields of numerical simulation and CAE, in particular to a parameterized static superelement construction method. Background technique [0002] With the development of modern computer technology, numerical modeling technology has become the main means to describe the structural characteristics. At present, the numerical simulation method of finite element method is commonly used in engineering field to carry out numerical modeling. The basic idea of ​​the finite element method is to divide the solution domain of the problem into a series of units, and the units are only connected by nodes. The quantity to be demanded inside the unit can be interpolated by the unit node through the selected functional relationship. Because the shape of the unit is simple, it is easy to balance the relationship and energy relationship to establish the equation of the node quantity, and then integrate the equations of each unit into the overa...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 丁桦周昊
Owner 深圳网蓝通用科技有限公司
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