CN105975683B - The fast searching method that finite element mesh model updates - Google Patents
The fast searching method that finite element mesh model updates Download PDFInfo
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- CN105975683B CN105975683B CN201610287423.5A CN201610287423A CN105975683B CN 105975683 B CN105975683 B CN 105975683B CN 201610287423 A CN201610287423 A CN 201610287423A CN 105975683 B CN105975683 B CN 105975683B
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- G06F30/00—Computer-aided design [CAD]
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
A kind of fast searching method that finite element mesh model updates, which is characterized in that specifically: the CAD model that will be updated first is imported into grid model；Then it is checked according to curved surface of the preset tolerance to grid model and CAD model；When the minimum range of grid node and CAD model curved surface is greater than the tolerance of setting, then it represents that CAD model updates, and records, dash number belonging to meshing is set out；When the minimum range of grid node and CAD model curved surface is less than or equal to the tolerance of setting, then it represents that do not update.The present invention can fast and accurately find update part of the new CAD model relative to grid model.
Description
Technical field
The invention belongs to computer-aided engineering fields, and in particular to a kind of quick lookup that finite element mesh model updates
Method.
Background technique
With the development of computer software and hardware, the scale of model of CAE simulation calculation is continuously improved.It is with complete automobile collision emulation
Example, the previous simple whole vehicle model element number of mesh is about at 1,500,000 or so.And according to development progress, grid model is wanted
Accomplish real-time update as far as possible with CAD model to verify design.To accurately finding update in such large-scale grid model
Part or new feature, it is both bothersome, laborious, be also easy to happen omission.
Summary of the invention
In order to solve the above problems existing in the present technology, this application provides a kind of the fast of finite element mesh model update
Fast lookup method makes timely, accurate modification convenient for part or feature of the engineer to update.
The present invention provides a kind of finite element mesh model update fast searching method, specifically:
Step 1: the CAD model that will be updated first, imported into grid model；
Step 2: then being checked according to curved surface of the preset tolerance to grid model and CAD model；
Step 3: when the minimum range of grid node and CAD model curved surface is greater than the tolerance of setting, then it represents that CAD
Model updates, and records, dash number belonging to meshing is set out；
When the minimum range of grid node and CAD model curved surface is less than or equal to the tolerance of setting, then it represents that do not occur
It updates.
Specifically, this method further include: the grid model updated is uniformly put into a collection by the 4th step, is convenient for
It updates later.
Specifically, the geometric surface of CAD model and grid model are denoted as surface and mesh respectively；For every in mesh
One node, being denoted as Ni, (i=1,2,3 ... n).
Specifically, for Ni, if the minimum range of the point and geometric surface is less than tolerance, then it represents that point fitting
On surface.
More specifically, circulation comparison is carried out to nodes all in mesh, if the minimum range of all nodes and surface
Respectively less than tolerance, then indifference between surface and mesh；If there is the minimum range of part of nodes and surface are greater than
Equal to tolerance, then the corresponding region surface of this Partial Mesh is updated.
As more specific, grid model region division is specific as follows: certain node Ni, asks it to surface if necessary
Minimum range, then need the point to operate all surface, to obtain a minimum value.
As more specific, carry out node and when surface minimum range solves, first have to the range for calculating surface.
As more specific, the range of surface is determined in the sphere of the node by default sphere diameter
Surface is solved.
The present invention is due to using the above technical method, and can obtain following technical effect: the present invention can be quick and precisely
Find update part of the new CAD model relative to grid model, save a large amount of model times of engineer inspection, and effectively keep away
Exempt from the omission of model modification.
Detailed description of the invention
The present invention shares 3 width of attached drawing:
Fig. 1 is CAD model；
Fig. 2 is grid model；
Fig. 3 is the schematic diagram that range is limited with auxiliary.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present invention clearer, below with reference to the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention carries out clear and complete description:
Embodiment 1
The present invention provides a kind of finite element mesh model update fast searching method, specifically:
Step 1: the CAD model that will be updated first, imported into grid model；As being explained further, such as Fig. 1, figure
Shown in 2, the geometric surface of CAD model and grid model are denoted as surface and mesh respectively；For each node in mesh,
Be denoted as Ni (i=1,2,3 ... n)；
Step 2: then being checked according to curved surface of the preset tolerance to grid model and CAD model；
Step 3: when the minimum range of grid node and CAD model curved surface is greater than the tolerance of setting, then it represents that CAD
Model updates, and records, dash number belonging to meshing is set out；As being explained further, have part of nodes with
The minimum range of surface is more than or equal to tolerance, then the corresponding region surface of this Partial Mesh is updated.
When the minimum range of grid node and CAD model curved surface is less than or equal to the tolerance of setting, then it represents that do not occur
It updates.As being explained further, for Ni, if the minimum range of the point and surface are less than tolerance, then it represents that point patch
It closes on surface；Or circulation comparison is carried out to nodes all in mesh, if the minimum range of all nodes and surface
Respectively less than tolerance, then indifference between surface and mesh.
Embodiment 2
As the supplement of embodiment 1, a kind of fast searching method that finite element mesh model updates, specifically:
Step 1: the CAD model that will be updated first, imported into grid model；As being explained further, by CAD mould
Type and grid model are simultaneously denoted as surface and mesh respectively；For each node in mesh, be denoted as Ni (i=1,2,3 ...
n)；
Step 2: then being checked according to curved surface of the preset tolerance to grid model and CAD model；
Step 3: when the minimum range of grid node and CAD model curved surface is greater than the tolerance of setting, then it represents that CAD
Model updates, and records, dash number belonging to meshing is set out；As being explained further, have part of nodes with
The minimum range of surface is more than or equal to tolerance, then the corresponding region surface of this Partial Mesh is updated.
When the minimum range of grid node and CAD model curved surface is less than or equal to the tolerance of setting, then it represents that do not occur
It updates.As being explained further, for Ni, if the minimum range of the point and surface are less than tolerance, then it represents that point patch
It closes on surface；Or circulation comparison is carried out to nodes all in mesh, if the minimum range of all nodes and surface
Respectively less than tolerance, then indifference between surface and mesh；
Step 4: the CAD model updated is uniformly put into a collection, convenient for updating later.
Embodiment 3
It is supplemented as embodiment 1 or embodiment 2, grid model region division is specific as follows: certain node Ni, if necessary
It asks it to arrive the minimum range of surface, then the point is needed to operate all surface, thus obtain a minimum value, it is real
Only need to find out the minimum range of node Yu nearest patch in border, and for the patch from point " far ", it does not need to carry out
Solution can also determine that out that its distance must not be global minimum.
When carrying out node and the solution of surface minimum range, the range for calculating surface is first had to.The surface's
Range determines that the surface in the sphere of the node is solved by default sphere diameter, such as Fig. 3.
Problem to be solved by this invention is: quickly and accurately finding out existing grid model and newly gives CAD model not
Together, convenient for the subsequent part grid updating of completion.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. the fast searching method that a kind of finite element mesh model updates, which is characterized in that specifically:
Step 1: the CAD model that will be updated first, imported into grid model；
Step 2: then being checked according to curved surface of the preset tolerance to grid model and CAD model；
Step 3: when the minimum range of grid node and CAD model curved surface is greater than the tolerance of setting, then it represents that CAD model
It updates, and records, dash number belonging to meshing is set out；
When the minimum range of grid node and CAD model curved surface is less than or equal to the tolerance of setting, then it represents that do not update；
The geometric surface of CAD model and grid model are denoted as surface and mesh respectively；For each node in mesh, note
For Ni (i=1,2,3 ... n)；For Ni, if the minimum range of the point and geometric surface is less than tolerance, then it represents that point fitting
On surface；Circulation comparison is carried out to nodes all in mesh, if the minimum range of all nodes and surface are respectively less than
Tolerance, then indifference between surface and mesh；Hold if there is the minimum range of part of nodes and surface are more than or equal to
Difference, then the corresponding region surface of this Partial Mesh is updated；Grid model region division is specific as follows: certain node
Ni asks it to arrive the minimum range of surface if necessary, then needs the point to operate all surface, to obtain one
A minimum value；When carrying out node and the solution of surface minimum range, the range for calculating surface is first had to；The model of surface
It encloses through default sphere diameter and determines that the surface in the sphere of the node is solved.
2. the fast searching method that a kind of finite element mesh model according to claim 1 updates, which is characterized in that we
Method further include: the grid model updated is uniformly put into a collection by the 4th step, convenient for updating later.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104615454A (en) * | 2013-11-05 | 2015-05-13 | 空间公司 | Method and system for UPDATING A CAD MODEL, and readable media |
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| CN104615454A (en) * | 2013-11-05 | 2015-05-13 | 空间公司 | Method and system for UPDATING A CAD MODEL, and readable media |
Non-Patent Citations (2)
| Title |
|---|
| 一种基于有限元网格的车身CAD 曲面数据修复方法;胡平 等;《计算力学学报》;20060430;第23卷(第2期);第142-145页 * |
| 基于有限元网格变形的飞机外形曲面修改;曾建江 等;《南京航空航天大学学报》;20080831;第40卷(第4期);第534-538页 * |
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