CN111199085A - Method for abstracting expression model and state thereof - Google Patents
Method for abstracting expression model and state thereof Download PDFInfo
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- CN111199085A CN111199085A CN201811287938.0A CN201811287938A CN111199085A CN 111199085 A CN111199085 A CN 111199085A CN 201811287938 A CN201811287938 A CN 201811287938A CN 111199085 A CN111199085 A CN 111199085A
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Abstract
The invention discloses a method for abstracting an expression model and a state thereof, which comprises the following steps: creating an abstract label corresponding to the concrete geometric object, and expressing the model and the state thereof through the abstract label; and when the simulation is carried out, the abstract label is adopted to associate the corresponding simulation setting. According to the method for the abstract expression model and the state of the abstract expression model, under the condition that the CAD model changes, the CAE simulation application process does not need to select a specific geometric object again due to the fact that the abstract expression label name is adopted, so that the aim of templating the CAE simulation application process is achieved, time for repeatedly defining the specific geometric object is saved, and possible errors are reduced.
Description
The technical field is as follows:
the invention relates to a method applied to computer aided design.
Background art:
with the development of Computer Aided design (CAE) technology, in the development process of complex products, more and more industrial products adopt CAE means to perform digital virtual verification. The computer aided design is an approximate numerical analysis method for solving the problems of analysis and calculation of mechanical properties such as complex engineering and product structure strength, rigidity, buckling stability, dynamic response, heat conduction, three-dimensional multi-body contact, elastoplasticity and the like, optimization design of structure performance and the like with the assistance of a computer. The basic idea is to decompose the solution area of a continuum with a complex shape into limited sub-areas with simple forms, i.e. to simplify the continuum into an equivalent assembly combined by a limited number of units; by discretizing the continuum, the problem of solving the field variables (stress, displacement, pressure, temperature, etc.) of the continuum is simplified to solving the field variable values on the finite element nodes. The basic equation to be solved at this time is an algebraic equation system instead of the original differential equation system describing the real continuum field variable, and an approximate numerical solution is obtained, and the approximation degree of the solution depends on the type and the number of the units and the interpolation function of the units.
As shown in fig. 1, currently, generally, Computer Aided Design (CAD) geometry is used as input data for CAE simulation process, and some simulation setup data needs to be associated with a specific CAD geometry object, such as being directly attached to a CAD geometry surface. When the CAD geometric model changes, the subsequent simulation needs to operate the CAD model again, and a corresponding CAD geometric surface is selected. Since CAD geometry is the result of industrial design, the creation of a product necessarily requires a large number of design changes, which results in repeated selection operations of CAD geometry during CAE simulation.
The invention content is as follows:
the invention aims to provide a method for abstracting an expression model and a state thereof, which can be used for abstracting and expressing a computer aided design model and a state thereof.
In order to solve the above technical problems, the present invention provides a method for abstracting an expression model and a state thereof, comprising: creating an abstract label corresponding to the concrete geometric object, and expressing the model and the state thereof through the abstract label; and when the simulation is carried out, the abstract label is adopted to associate the corresponding simulation setting.
The method for abstracting the expression model and the state of the expression model has the advantages that: compared with the prior art, under the condition that the CAD model changes, the CAE simulation application process does not need to select a specific geometric object again due to the adoption of the label name of the abstract expression, so that the aim of templating the CAE simulation application process is fulfilled, the time for repeatedly defining the specific geometric object is saved, and possible errors are reduced.
Preferably, the model and its state are a three-dimensional computer-aided design CAD model and its state.
Preferably, the abstract label is created in association with the CAD graphic area.
Preferably, the creating of the abstract label corresponding to the CAD concrete geometric object refers to classifying and creating an abstract label group in software and/or a browser and/or a system with a CAD graphic area according to a computer aided engineering CAE simulation setting condition.
Preferably, the CAE simulation setup condition for creating the abstract label packet includes: material and/or load and/or contact and/or boundary constraints and/or meshing and/or cell properties.
Preferably, under the corresponding grouping, an abstract label name is correspondingly created; and the abstract label name association selects a corresponding geometric object in the CAD as the state attribute information of the geometric object.
Preferably, the definition of the abstract label exists in the form of a plug-in.
Preferably, the geometric object comprises a point and/or a line and/or a face and/or a volume and/or a coordinate system of the three-dimensional CAD model.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a CAD geometry requiring repeated selection operations during CAE simulation in the prior art;
FIG. 2 is a diagram illustrating the creation of abstract labels for CAD concrete geometric objects according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a CAE software application process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of defining an abstract representation three-dimensional model tag and applying the abstract representation three-dimensional model tag to simulation according to an embodiment of the invention;
FIG. 5 is a diagram illustrating that the simulation setup does not need to be changed after the geometric model is updated according to the embodiment of the present invention.
Detailed Description
In order to solve the above technical problems, the method for abstracting an expression model and a state thereof according to the present invention includes: creating an abstract label corresponding to the concrete geometric object, and expressing the model and the state thereof through the abstract label; and when the simulation is carried out, the abstract label is adopted to associate the corresponding simulation setting. Compared with the prior art, under the condition that the CAD model changes, the CAE simulation application process does not need to select a specific geometric object again due to the adoption of the label name of the abstract expression, so that the aim of templating the CAE simulation application process is fulfilled, the time for repeatedly defining the specific geometric object is saved, and possible errors are reduced. The model and its state may be a three-dimensional computer-aided design CAD model and its state. The abstract label can be associated and created in a CAD graph area. The creating of the abstract label corresponding to the CAD concrete geometric object refers to classifying and creating abstract label groups in software and/or a browser and/or a system with a CAD graph area according to the simulation setting conditions of the computer aided engineering CAE. The CAE simulation setup conditions for creating the abstract label packet may include: material and/or load and/or contact and/or boundary constraints and/or meshing and/or cell properties. Correspondingly creating an abstract label name under the corresponding group; and the abstract label name association selects a corresponding geometric object in the CAD as the state attribute information of the geometric object. The definition of the abstract label may exist in the form of a plug-in. The geometric object may comprise a point and/or a line and/or a face and/or a volume and/or a coordinate system of the three-dimensional CAD model.
The invention provides a method for abstracting an expression model and a state thereof. The technical scheme of the invention is as follows: an abstract label definition of the CAD concrete geometric object is created, and the three-dimensional CAD model and the state of the three-dimensional CAD model are expressed through the abstract label. The abstract label can be associated and created in a CAD graphic area on one hand, and the abstract label is associated with corresponding simulation setting when CAE simulation is carried out on the other hand.
The abstract label definition for creating the CAD concrete geometric object refers to that in software, a browser and a system with a CAD graph area, abstract label grouping can be created in a classified mode according to CAE simulation setting conditions, such as material creation, load creation, contact creation, boundary constraint, grid division and unit attribute grouping. Under the corresponding grouping, abstract label names can be correspondingly created, and meanwhile, the names need to be associated and selected to be corresponding geometric objects in the CAD interface as state attribute information of the geometric objects. The definition of the abstract label may exist as a plug-in to the CAD software. Fig. 2 is a corresponding schematic diagram in CAD software.
The abstract label expresses the three-dimensional CAD model and the state thereof, and is used for defining the name of the abstract label and expressing a geometric object set of the three-dimensional CAD model, wherein the geometric object set mainly refers to points, lines, surfaces, bodies, coordinate systems and the like of the three-dimensional CAD model.
The association creation of the abstract label in the CAD graph area means that after the name of the abstract label is defined, corresponding geometric objects need to be interactively selected in the CAD graph area, and the association relationship is created between the geometric objects and the name of the abstract label. In the case of updating the CAD model, if the geometric object changes, for example, the original position changes from one surface to two surfaces, the geometric object needs to be reselected to complete the association.
The abstract label is associated with the corresponding simulation setting during the CAE simulation, which means that the selected abstract label name is not a geometric object such as a surface, a line and the like of a specific CAD model but a selected abstract label name, that is, the simulation setting is associated with the abstract label when the CAE simulation defines the corresponding simulation setting, and fig. 3 is a schematic diagram of a using process of CAE software:
by adopting the scheme of the invention, the three-dimensional model and the state thereof can be defined in an abstract expression mode. Compared with the prior art, under the condition that the CAD model changes, the CAE simulation application process does not need to select a specific geometric object again due to the adoption of the label name of the abstract expression, so that the aim of templating the CAE simulation application process is fulfilled, the time for repeatedly defining the specific geometric object is saved, and possible errors are reduced, which is shown in the attached figures 4 and 5.
In the optimization design, the objective function depends on design variables, and the value range of the design variables has various limiting conditions, such as strength, rigidity and the like. Each constraint can be written as a function containing a design variable, called a constraint or design constraint.
The mesh division is an important link for establishing a finite element model, the problems are required to be considered, the required workload is large, and the divided mesh form has direct influence on the calculation precision and the calculation scale.
The invention is not limited to the embodiments discussed above. The foregoing description of the specific embodiments is intended to describe and explain the principles of the invention. Obvious modifications or alterations based on the teachings of the present invention should also be considered as falling within the scope of the present invention. The foregoing detailed description is provided to disclose the best mode of practicing the invention, and also to enable a person skilled in the art to utilize the invention in various embodiments and with various alternatives for carrying out the invention.
Claims (8)
1. A method of abstracting an expression model and its state, comprising:
creating an abstract label corresponding to the concrete geometric object, and expressing the model and the state thereof through the abstract label;
and when the simulation is carried out, the abstract label is adopted to associate the corresponding simulation setting.
2. The method of abstractly expressing a model and its states as claimed in claim 2, wherein said model and its states are a three-dimensional computer-aided design (CAD) model and its states.
3. A method for abstract representation models and states thereof according to claim 2, characterized in that the abstract labels are created in association in a CAD figure area.
4. The method for abstracting an expression model and the state thereof as claimed in claim 3, wherein the creating of the abstraction label corresponding to the CAD concrete geometric object means that in the software and/or browser and/or system having CAD graphic area, the classification is performed according to the CAE simulation setup condition of the CAD, and the abstraction label grouping is created.
5. The method for abstracting an expression model and its state according to claim 4, wherein the CAE emulation setup conditions for creating an abstraction tag packet include: material and/or load and/or contact and/or boundary constraints and/or meshing and/or cell properties.
6. A method for abstract representation models and its states according to claim 5 characterized in that under the corresponding grouping, corresponding abstract label names are created;
and the abstract label name association selects a corresponding geometric object in the CAD as the state attribute information of the geometric object.
7. A method for abstract representation models and its states according to claim 6, characterized in that the definition of the abstract tags is in plug-in form.
8. A method for abstract representation models and states thereof according to any of claims 1-7, characterized in that the geometric objects comprise points and/or lines and/or faces and/or volumes and/or coordinate systems of a three-dimensional CAD model.
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| CN201811287938.0A CN111199085A (en) | 2018-10-31 | 2018-10-31 | Method for abstracting expression model and state thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112149261A (en) * | 2020-11-24 | 2020-12-29 | 上海索辰信息科技股份有限公司 | Rotating mechanical structure strength simulation system and method based on direct analog calculation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112149261A (en) * | 2020-11-24 | 2020-12-29 | 上海索辰信息科技股份有限公司 | Rotating mechanical structure strength simulation system and method based on direct analog calculation |
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Application publication date: 20200526 |