CN114820978A - Finite element modeling method and device and electronic equipment - Google Patents

Abstract

The invention relates to the technical field of computer aided engineering, in particular to a finite element modeling method, a finite element modeling device and electronic equipment. The finite element modeling method comprises the following steps: obtaining basic entities of a three-dimensional model of a structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two basic entities; combining at least two basic entities into a target entity, and extracting the middle surface of the target entity to obtain a middle surface of the target entity; splitting the target entity middle plane into a plurality of basic entity middle planes, wherein each basic entity middle plane corresponds to a corresponding basic entity one by one; and endowing the material attribute corresponding to each basic entity to the corresponding basic entity middle surface to obtain a finite element model. According to the arrangement, the target entity middle surface can automatically inherit the topological connection relation between the basic entities in the modeling process, and simultaneously, the middle surface material attribute is automatically given, so that the participation of manpower in the modeling process is reduced, the modeling process time is shortened, and the modeling efficiency is improved.

Description

Finite element modeling method and device and electronic equipment

Technical Field

The invention relates to the technical field of computer aided engineering, in particular to a finite element modeling method, a finite element modeling device, electronic equipment and a storage medium.

Background

In the mechanical manufacturing process, parameters such as strength and rigidity of some structural members often need to be calculated, so that the design of the structural members is corrected and perfected according to the calculation result. Taking a turntable of an automobile crane as an example, the turntable is one of key structural members of the automobile crane, and because the loading condition and the structural type are complex, in the design stage, a finite element analysis method is usually adopted to calculate key parameters such as the strength and the rigidity of the turntable, which affect the performance of the turntable.

The existing finite element model modeling method comprises the following steps: and respectively extracting the middle surface of each part in the three-dimensional model of the structural member, and then adding information to the middle surface in a manual mode to obtain the finite element model. However, the existing modeling method not only needs to consume a large amount of manpower, but also is long in modeling process and low in modeling efficiency.

Disclosure of Invention

The invention provides a finite element modeling method, a finite element modeling device and electronic equipment, which are used for solving the problems that the conventional modeling method needs to consume a large amount of manpower, the modeling process takes long time and the modeling efficiency is low.

According to a first aspect of the present application, there is provided a finite element modeling method comprising:

obtaining basic entities of a three-dimensional model of a structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two basic entities;

combining at least two basic entities into a target entity, and extracting the middle surface of the target entity to obtain a target entity middle surface;

splitting the target entity middle plane into a plurality of basic entity middle planes, wherein each basic entity middle plane corresponds to a corresponding basic entity one by one;

and endowing the material attribute corresponding to each basic entity to the corresponding basic entity middle surface to obtain a finite element model.

In one embodiment, the splitting the target entity midplane is a plurality of base entity midplanes, including:

determining thickness information of a basic entity corresponding to the middle surface of the target entity;

splitting the target entity midplane into a plurality of base entity midplanes based on the thickness information.

In one embodiment, the splitting the target entity midplane into a plurality of base entity midplanes based on the thickness information comprises:

and splitting the target entity middle plane into a plurality of basic entity middle planes by taking the areas corresponding to the same thickness information as a whole.

In one embodiment, the target entity midplane comprises: a plurality of sub-middle planes; each sub-midplane corresponds to corresponding thickness information;

the splitting the target entity midplane into a plurality of basic entity midplanes by taking the areas corresponding to the same thickness information as a whole, including:

taking the sub-median planes corresponding to the same thickness information as a set to obtain a plurality of sub-median plane sets;

and aiming at each sub-middle surface set, merging the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

In one embodiment, the target entity midplane comprises: a plurality of sub-middle planes;

splitting the target entity midplane into a plurality of base entity midplanes, comprising:

taking the sub-middle planes corresponding to one basic entity as a set to obtain a plurality of sub-middle plane sets;

and aiming at each sub-middle surface set, merging the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

In one embodiment, the splitting the target entity midplane into a plurality of base entity midplanes by using the regions corresponding to the same thickness information as a whole includes:

determining the boundaries of the regions corresponding to the same thickness information;

and segmenting the target entity midplane along the boundary to split the target entity midplane into a plurality of basic entity midplanes.

In one embodiment, the assigning the material property corresponding to each of the basic entities to the corresponding basic entity midplane includes:

summarizing the corresponding relation between the middle surface of the basic entity and the material attribute corresponding to each basic entity;

and based on the summarized content, assigning the material attribute corresponding to each basic entity to the corresponding basic entity middle surface.

In one embodiment, the merging at least two of the base entities into one target entity further includes:

and preprocessing the three-dimensional model.

In one embodiment, the preprocessing the three-dimensional model includes:

performing at least one of the following preprocessing operations on the three-dimensional model:

aligning the plates of the basic entity;

filling gaps among the basic entities;

and removing the chamfer of the basic entity.

According to a second aspect of embodiments of the present application, there is provided a finite element modeling apparatus including:

the acquisition module is used for acquiring basic entities of a three-dimensional model of a structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two basic entities;

the extraction module is used for combining at least two basic entities into one target entity and extracting the middle plane of the target entity to obtain a middle plane of the target entity;

the middle surface of the target entity comprises a topological connection relation among the basic entities;

the splitting module is used for splitting the target entity middle plane into a plurality of basic entity middle planes, and each basic entity middle plane corresponds to a corresponding basic entity one by one;

and the giving module is used for giving the material attribute corresponding to each basic entity to the corresponding basic entity middle surface to obtain the finite element model.

According to a third aspect of embodiments of the present application, there is provided an electronic apparatus, comprising: a processor; a memory for storing the processor-executable instructions; the processor is configured to perform the method according to any of the above embodiments.

According to a fourth aspect of embodiments of the present application, there is provided a computer-readable storage medium storing a computer program for executing the method of any of the above embodiments.

In the scheme provided by the embodiment of the application, a basic entity of a three-dimensional model of a structural part and material attributes corresponding to the basic entity are obtained, wherein the basic entity comprises at least two basic entities; then merging the basic entities of the three-dimensional model into a target entity; extracting the middle surface of the target entity to obtain a middle surface of the target entity; the obtained target entity middle surface comprises the topological connection relation among the basic entities; splitting the target entity middle plane into a plurality of basic entity middle planes, wherein the basic entity middle planes obtained at the moment correspond to corresponding basic entities one by one; and then, endowing the material properties corresponding to the basic entity to the corresponding basic entity middle surface to obtain a finite element model. According to the arrangement, in the process of finite element modeling, the target entity middle surface of the finite element model can automatically inherit the topological connection relation among the basic entities, the topological relation does not need to be added manually, meanwhile, the material attribute corresponding to each basic entity is endowed to the corresponding basic entity middle surface, the manual material attribute addition is avoided, the participation of manpower in the modeling process is reduced, the time of the modeling process is shortened, and the modeling efficiency is improved.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

FIG. 1 is a flow chart illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 2 is a partial flow diagram illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 3 is a partial flow diagram illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 4 is a partial flow chart of a finite element modeling method according to an embodiment of the present application.

FIG. 5 is a partial flow diagram illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 6 is a partial flow diagram illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 7 is a flow chart illustrating a finite element modeling method according to an embodiment of the present application.

FIG. 8 is a block diagram illustrating a finite element modeling apparatus according to an embodiment of the present application.

Fig. 9 is a block diagram illustrating an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Summary of the application

In the mechanical manufacturing process, parameters such as strength and rigidity of some structural members often need to be calculated, so that the design of the structural members is corrected and perfected according to the calculation result. Taking a turntable of an automobile crane as an example, the turntable is one of key structural members of the automobile crane, and because the loading condition and the structural type are complex, in the design stage, a finite element analysis method is usually adopted to calculate key parameters such as the strength and the rigidity of the turntable, which affect the performance of the turntable.

The turntable is a large-scale structural member formed by welding a plurality of plates, the thicknesses of the plates are different, the structures and the sizes are different according to the tonnage of the automobile crane and the arrangement form, and a great deal of effort is required to be invested in the processing steps of structure modeling of the turntable and the like during the simulation of the turntable.

The current common processing method is to import the geometric model provided by the design department, extract the middle plane, geometrically clean and create the material property to obtain the finite element model. However, in this way, the extracted midplanes are discrete, independent and have no topological relationship. The lack of topological relation causes more unit nodes, time consumption for calculation and no benefit for subsequent optimization when the grid is created in the subsequent steps. In order to avoid a series of consequences caused by the lack of topological relations, the topological relations can be added to the extracted middle planes in a manual mode. Meanwhile, in the existing modeling method, material attributes need to be added manually, but the modeling method of adding information such as topological relation, material attributes and the like to the middle surface manually not only needs to consume a large amount of manpower, but also has long time for the modeling process and low modeling efficiency.

In order to solve the problems, according to the embodiment of the application, the basic entities in the geometric model of the structural member are combined in advance, the middle surfaces are extracted to obtain the middle surfaces inherited with the topological relation, the middle surfaces are split to obtain the middle surfaces corresponding to the basic entities in the geometric model, the middle surfaces are automatically endowed with material attributes to obtain the finite element model, and therefore the arrangement is that in the finite element modeling process, the middle surfaces can automatically inherit the topological connection relation among the basic entities, and meanwhile, the material attributes are automatically endowed to the middle surfaces, the participation of manpower in the modeling process is reduced, the modeling process time is shortened, and the modeling efficiency is improved.

Having described the general principles of the present application, various non-limiting embodiments of the present application will now be described with reference to the accompanying drawings.

Exemplary method

FIG. 1 is a flow chart illustrating a finite element modeling method according to an embodiment of the present application. As shown in fig. 1, the method includes the following.

S110, obtaining basic entities of the three-dimensional model of the structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two.

The three-dimensional model can be pre-built by a design department or other related departments. Typically, the three-dimensional model comprises at least two underlying entities. In practical application, a specific design process of a structural member is cooperatively completed by a plurality of departments, and among the departments, a department specially responsible for building a three-dimensional model is available. The department can use different materials to build the structure based on the demand to draw the three-dimensional model based on the structure of building, correspondingly, each subcomponent in the structure corresponds to each basic entity of the three-dimensional model. Further, when the three-dimensional model is built, the material attributes corresponding to each basic entity in the three-dimensional model are annotated based on the material attributes of each sub-component. In particular, the material properties may include: the type of material, the rigidity of the material, the strength of the material and other characteristics. In practical applications, the relevant personnel can define the content included in the material attribute based on the actual requirements of the relevant personnel.

And S120, combining at least two basic entities into one target entity, and extracting the middle plane of the target entity to obtain the middle plane of the target entity.

It should be noted that, the manner of merging at least two basic entities into one target entity may include: and carrying out Boolean addition operation on the basic entities, and combining the basic entities into a target entity. The boolean addition is a common way of merging entities in the industry and will not be described here too much. The step S120 is to convert the three-dimensional model from multiple entities into a target entity, and then extract a middle plane based on the target entity, and thus the extracted target middle plane can inherit the topological relationship of each basic entity in the original three-dimensional model.

S130, splitting the target entity middle plane into a plurality of basic entity middle planes, wherein each basic entity middle plane corresponds to a corresponding basic entity one by one.

It should be noted that the final result of modeling includes: the basic entity middle surface is in one-to-one correspondence with the basic entity, and the target entity middle surface is only one intermediate quantity. Therefore, in step S130, when splitting the middle plane of the target entity, the split middle plane of the base entity needs to correspond to the base entity one to one.

And S140, endowing the material properties corresponding to each basic entity to the corresponding basic entity middle surface to obtain a finite element model.

In step S140, attributes are automatically assigned to the middle planes of the basic entity based on the corresponding relationship between the basic entity and the middle planes of the basic entity, so as to avoid manually assigning attributes to the middle planes of the basic entity, and reduce dependence on manpower in the modeling process.

In the finite element modeling method provided by the embodiment of the application, after a plurality of basic entities of a three-dimensional model are converted into one target entity, a middle plane is extracted from the target entity to obtain a target middle plane inherited with a topological relation, the target middle plane is then split, and the target middle plane is split into basic entity middle planes corresponding to the basic entities.

In the scheme provided by the application, the target entity middle plane needs to be split into a plurality of basic entity middle planes, and each basic entity middle plane is ensured to be in one-to-one correspondence with the corresponding basic entity; in practical implementation, the process is implemented in various ways:

the other is a splitting scheme adopted aiming at the condition that different basic entities have different thicknesses and the same basic entity adopts plates with the same thickness.

For example: the rotary table of the crane is basically formed by welding regular plates, different plates are different in thickness, one plate is generally adopted as a part when the rotary table is designed, different parts are plates different in thickness, and under the condition, the three-dimensional model of the rotary table conforms to the condition that different basic entities are different in thickness and the same basic entity is a plate with the same thickness.

In this case, during splitting, the middle plane of the target entity may be split based on the thickness, and referring to fig. 2, the splitting scheme may specifically include:

s210, determining thickness information of the basic entity corresponding to the middle surface of the target entity.

It should be noted that, in the process of performing facet extraction, the three-dimensional model is provided with thickness information, so that the thickness information of the basic entity corresponding to the facet in the target entity can be determined based on the correspondence between the facet in the target entity and the three-dimensional model.

S220, splitting the target entity middle plane into a plurality of basic entity middle planes based on the thickness information.

It should be noted that, in the embodiment of the present application, an application scenario of dividing a target middle plane based on thickness is not limited to a turntable modeling process of a crane, and may also be applied to other situations, where thicknesses of different basic entities are different, and a same basic entity corresponds to a thickness. In this case, the target entity midplane can be split into a plurality of basic entity midplanes with the regions corresponding to the same thickness information as a whole. The middle surface can be split based on different thicknesses, and the basic entity middle surfaces corresponding to the basic entities one to one are obtained.

Specifically, there are various ways of splitting the middle plane of the target entity into multiple middle planes of the basic entity by using the regions corresponding to the same thickness information as a whole: based on different strategies and procedures adopted when performing the mid-plane extraction, the subsequent steps are also different.

In one way of mid-plane extraction, the extracted mid-plane is automatically divided into a plurality of sub-mid-planes based on thickness. I.e., a target entity midplane, is automatically divided into a plurality of sub-midplanes, each sub-midplane corresponding to a respective thickness. For example, a target entity midplane can be automatically classified as: a correspond the sub-median plane that thickness is n millimeter, b correspond the sub-median plane that thickness is m millimeter, c correspond the sub-median plane that thickness is k millimeter, because the structure accords with: the situation that different basic entities have different thicknesses and the same basic entity adopts plates with the same thickness is adopted, so a sub-middle planes with the corresponding thickness of n millimeters correspond to the basic entity A; b sub-midplanes corresponding to m millimeters in thickness correspond to the base entity B, and C sub-midplanes corresponding to k millimeters in thickness correspond to the base entity C. In this case, referring to fig. 3, the splitting manner may include:

and S2211, taking the sub-middle planes corresponding to the same thickness information as a set to obtain a plurality of sub-middle plane sets.

Taking the target entity middle plane mentioned in the above embodiments as an example, after step S2211 is performed, a plurality of sets may be obtained. Wherein, a set internally includes: a sub-midplanes corresponding to n millimeters in thickness, one set comprising internally: b sub-midplanes corresponding to a thickness of m millimeters, one set comprising internally: c corresponding to k mm thick sub-midplanes. Step S2212 is performed thereafter.

And S2212, merging the sub-middle planes in the sub-middle plane set aiming at each sub-middle plane set to obtain the corresponding basic entity middle plane.

Still taking the target entity middle plane mentioned in the above embodiments as an example, the child middle planes in the child middle plane set may be merged, that is; combining a sub-midplanes with the corresponding thickness of n millimeters to obtain a basic entity midplane corresponding to the basic entity A; b sub-midplanes with the corresponding thickness of m millimeters are combined to obtain a basic entity midplane corresponding to the basic entity B; and C sub-midplanes with the corresponding thickness of k millimeters are combined to obtain a basic entity midplane corresponding to the basic entity C. Thus, the basic entity middle planes corresponding to the basic entities one by one are obtained.

Further, in some target entity midplanes partitioning processes, there may not be corresponding child midplanes. In this case, referring to fig. 4, the following steps may be performed to complete the splitting of the midplane.

S2221, the boundaries of the regions corresponding to the same thickness information are determined.

Specifically, after step S210 is performed, the thickness information of the corresponding basic entity in the target entity may be obtained, and based on the thickness information, the boundary of the region corresponding to the same thickness information may be determined. The structural part conforms to the condition that the thicknesses of all the basic entities are different and the same basic entity has one thickness, so that the boundary of the region is consistent with the boundary between the middle surfaces of the basic entities corresponding to all the basic entities.

S2222, the target entity midplane is segmented along the boundary to split the target entity midplane into a plurality of basic entity midplanes.

Due to the boundaries of the regions, the boundaries between the faces of the basic entities corresponding to the respective basic entities coincide. Therefore, the target entity midplane is segmented along the boundary, the target entity midplane can be split into a plurality of basic entity midplanes, and the obtained basic entity midplanes correspond to the basic entities one by one.

It should be noted that, in practical application, the encountered situation is complex, the structural component may not meet the situation that "different basic entities have different thicknesses, and the same basic entity has one thickness", at this time, another splitting scheme may be adopted, the splitting scheme is suitable for extracting the middle plane of the target entity, and automatically divides the middle plane of the target entity into a plurality of sub-middle planes, and one sub-middle plane may only correspond to one basic entity, and one basic entity may correspond to a plurality of sub-middle planes, with reference to fig. 5, the splitting scheme includes:

s510, the child middle surfaces corresponding to one basic entity are taken as a set, and a plurality of child middle surface sets are obtained.

It should be noted that after the extraction of the middle planes is performed, a plurality of middle planes can be obtained, and then based on the corresponding relationship between the middle planes of the target entities and the corresponding relationship between the target entities and the basic entities, which basic entity the middle planes belong to is identified. In practical application, the point location at the boundary or hole of the basic entity can be used as a mark or a basis to determine the corresponding relationship between the basic entity and the sub-midplane. Specifically, for example, m mark points are selected on a basic entity, and it is determined into which sub-midplanes the mark points fall after a series of operations are performed, and the sub-midplanes having the mark points are the sub-midplanes corresponding to the mid-plane of the basic entity, and the sub-midplanes should be classified into a set.

S520, aiming at each sub-middle surface set, combining the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

By the arrangement, the problem of splitting the middle surface of the target entity in finite element modeling of the three-dimensional model which is not in accordance with the condition that different basic entities have different thicknesses and the same basic entity adopts plates with the same thickness can be solved, so that the scheme provided by the embodiment of the application has wider application scenes and application range.

In one embodiment, the three-dimensional model is a model built by a design department for the whole project, and in the building process, the actual requirements of other departments are considered, and the process and the design are considered, so that the three-dimensional model can have the conditions that rib plates are not aligned, welding gaps are left, chamfers are left and the like.

For this case, the three-dimensional model may be preprocessed after the three-dimensional model is acquired. Specifically, the preprocessing operation performed on the three-dimensional model may include: aligning the plates of the basic entity; filling gaps among the basic entities; and removing the chamfer of the basic entity. It should be noted that the above preprocessing operation is only an exemplary one, and the preprocessing operation may further include: the extension of the plate and the intersection of the plate are processed.

In one embodiment, for the purpose of automatically completing the assignment of the material properties, referring to fig. 6, the actual step of "assigning the material properties corresponding to each basic entity to the corresponding basic entity midplane" may include:

s610, summarizing the corresponding relation between the surfaces of the basic entities and the material attributes corresponding to the basic entities.

Specifically, the summary may be based on an embodiment in which the summarized content is stored in a form of a table, a document, or the like, and the summarized content is stored in one table, and the summary may be completed by placing an identifier of a middle surface of a basic entity (the identifier may be information that can characterize the middle surface of the basic entity, such as thickness, or the like), an identifier of a corresponding basic entity (the identifier may be information that can characterize the basic entity, such as thickness, or the like), and a material attribute corresponding to the basic entity in the same row.

And S620, based on the summarized content, endowing the material attributes corresponding to the basic entities to the corresponding basic entity middle planes.

Specifically, as described above by taking an example of an embodiment in which the format of the summarized table of contents is stored, each row of the table may be read sequentially, and the material attribute recorded in the row may be assigned to the middle plane of the basic entity corresponding to the identifier of the middle plane of the basic entity of the row. By the arrangement, the attribute of the material can be automatically given, the dependence on manpower in the modeling process is reduced, and the modeling efficiency is improved.

FIG. 7 is a flow chart of a finite element modeling method provided in an embodiment of the present application. The finite element modeling method provided by the present application is described below with reference to fig. 7, in conjunction with a specific embodiment:

and S710, importing the three-dimensional model of the turntable into UG.

It should be noted that UG is a very powerful three-dimensional modeling software, and supports multiple forms of secondary development. The embodiment of the application adopts UG to process the three-dimensional model, and is only based on the consideration that UG supports multiple forms of secondary development, but not limited.

And S720, cleaning and aligning the rotary table model by utilizing a program based on UG secondary development.

Specifically, the programs developed based on UG secondary are created in advance by related personnel, and are used for building up three-dimensional models, and the programs may be programs for building up commands in advance to form modules. So set up, in the in-service use in-process, can clear up, align the revolving stage model based on modular procedure for UG output can carry out the regular basic entity of Boolean's operation.

When cleaning and aligning the rotary table, attention should be paid to processing of flanges of the main and auxiliary hoisting reducers, splitting of the race surfaces, processing of mounting holes at the tail of the arm, and processing of mounting holes at variable amplitude hinge points.

And S730, importing the cleaned and aligned model into Hypermesh, performing Boolean addition operation on the basic entities in the model by using Boolean addition operation commands carried by software, and combining the basic entities into a target entity.

It should be noted that Hypermesh is general finite element simulation software, supports secondary development, and has functions of extracting a middle plane, merging entities, and the like. The merging of entities based on Hypermesh is a function in the prior art, and is not described herein again.

And S740, performing median extraction on the target entity by using the hyper mesh self-contained median extraction function to obtain a target entity median with a correct topological relation, wherein the target entity median comprises a plurality of sub-medias.

By using the Hypermesh self-contained mid-plane extraction function, the extracted mid-plane can be automatically divided into a plurality of sub-mid-planes according to different thicknesses. Hypermesh can also automatically number each child middle.

And S750, identifying the number and thickness information of each sub-middle plane by using a program developed secondarily in advance based on Hypermesh, and automatically placing the number and thickness information into different component layers by taking the number and thickness as suffix names.

Specifically, the program developed twice in advance based on Hypermesh is created in advance by related personnel and used for splitting the middle surface program of the target entity, and the programs can be programs for establishing commands in advance and forming modules. By the arrangement, in the actual use process, the target entity middle surface can be split based on the modularized program, and the basic entity middle surfaces corresponding to the basic entities one to one are obtained.

And S760, endowing the material properties corresponding to each basic entity to the corresponding basic entity middle surface to obtain a finite element model.

Specifically, when step S760 is executed, it is necessary to first determine the corresponding relationship between the middle plane of the basic entity and the basic entity, and in the middle plane splitting process using Hypermesh, a "manner of identifying the number and thickness information of each middle plane, and automatically placing the information in different component layers with the number and thickness as a suffix" is adopted. Based on this, the thickness can be used as an identification of the correspondence between the sub-midplane and the entity. Specifically, a table can be built based on the material attributes corresponding to the basic entities, the table not only has the material attributes corresponding to the basic entities but also has the thickness information of the basic entities, and in practical application, the information in the table can be read, and the thickness information is used as an identifier to assign the material attributes to the "middle plane of the component layer corresponding to the thickness information corresponding to the material attributes". The thickness information corresponding to the material property refers to thickness information of a basic entity corresponding to the material property. This completes the material property assignment.

And S770, meshing the finite element model.

The mesh division can be performed on the finite element model based on the Hypermesh self-contained program, and details are not repeated herein. By the method, a finite element model of the turntable can be obtained, and further, meshing of the finite element model can be completed based on the step S770, so that convenience is brought to other subsequent processing processes. In the process of establishing the finite element model, the embodiment of the application reduces the participation of manpower in the modeling process, shortens the time in the modeling process and improves the modeling efficiency.

Exemplary devices

The embodiment of the device can be used for executing the embodiment of the method. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.

FIG. 8 is a block diagram illustrating a finite element modeling apparatus according to an embodiment of the present application. As shown in fig. 8, the apparatus includes:

the obtaining module 810 is configured to obtain a basic entity of the three-dimensional model of the structural member and material attributes corresponding to the basic entity, where the basic entity includes at least two basic entities;

an extraction module 820, configured to combine at least two basic entities into one target entity, and extract a middle plane of the target entity to obtain a middle plane of the target entity;

the splitting module 830 is configured to split the target entity midplane into multiple basic entity midplanes, where each basic entity midplane corresponds to a corresponding basic entity one to one;

and the assigning module 840 is configured to assign the material property corresponding to each basic entity to the corresponding basic entity middle plane to obtain a finite element model.

In one embodiment, the splitting module 840 for splitting the target entity midplane into a plurality of base entity midplanes includes:

and determining thickness information of the base entity corresponding to the middle plane of the target entity.

The target entity midplane is split into a plurality of base entity midplanes based on the thickness information.

In one embodiment, the splitting module 840 for splitting the target entity midplane into a plurality of base entity midplanes based on the thickness information includes:

and splitting the target entity middle plane into a plurality of basic entity middle planes by taking the areas corresponding to the same thickness information as a whole.

In one embodiment, the target entity midplane includes: a plurality of sub-middle planes; each sub-midplane corresponds to corresponding thickness information.

The splitting module 840 is configured to split the target entity midplane into a plurality of basic entity midplanes by using the regions corresponding to the same thickness information as a whole, and includes:

and taking the sub-median planes corresponding to the same thickness information as a set to obtain a plurality of sub-median plane sets.

And aiming at each sub-middle surface set, merging the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

In one embodiment, the splitting module 840, configured to split the target entity midplane into a plurality of basic entity midplanes by using regions corresponding to the same thickness information as a whole, includes:

the boundaries of the regions corresponding to the same thickness information are determined.

And partitioning the target entity midplane along the boundary to split the target entity midplane into a plurality of basic entity midplanes.

In one embodiment, the target entity midplane includes: and a plurality of son middle planes.

The splitting module 840 is configured to split the target entity midplane into multiple base entity midplanes, and includes:

and taking the sub-middle planes corresponding to one basic entity as a set to obtain a plurality of sub-middle plane sets.

And aiming at each sub-middle surface set, merging the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

In one embodiment, the finite element modeling apparatus further comprises a preprocessing module.

The preprocessing module is used for preprocessing the three-dimensional model.

In one embodiment, the preprocessing module is configured to preprocess the three-dimensional model, and includes:

performing at least one of the following preprocessing operations on the three-dimensional model:

aligning the plates of the basic entity.

Filling gaps between the basic entities.

And removing the chamfer of the basic entity.

Exemplary electronic device

Referring to fig. 9, fig. 9 is a block diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 9, the electronic device may include: at least one processor 910, at least one communication interface 920, at least one memory 930, and at least one communication bus 940.

In the embodiment of the present invention, the number of the processor 910, the communication interface 920, the memory 930, and the communication bus 940 is at least one, and the processor 910, the communication interface 920, and the memory 930 complete the communication with each other through the communication bus 940; it will be appreciated that the communication connections shown by processor 910, communication interface 920, memory 930, and communication bus 940 in FIG. 9 are merely optional.

Processor 910 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention.

The memory 930 may store an application program, and may include a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 910 is specifically configured to execute an application program in the memory to implement any of the embodiments of the finite element modeling method described above.

The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (10)

1. A finite element modeling method, comprising:

obtaining basic entities of a three-dimensional model of a structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two basic entities;

combining at least two basic entities into a target entity, and extracting the middle surface of the target entity to obtain a target entity middle surface;

splitting the target entity middle plane into a plurality of basic entity middle planes, wherein each basic entity middle plane corresponds to a corresponding basic entity one by one;

and endowing the material attribute corresponding to each basic entity to the corresponding basic entity middle surface to obtain a finite element model.

2. The finite element modeling method of claim 1, wherein the splitting the target entity midplane into a plurality of base entity midplanes, comprises:

determining thickness information of a basic entity corresponding to the middle surface of the target entity;

splitting the target entity midplane into a plurality of base entity midplanes based on the thickness information.

3. A finite element modeling method as claimed in claim 2, wherein the splitting the target entity midplane into a plurality of base entity midplanes based on the thickness information comprises:

and splitting the target entity middle plane into a plurality of basic entity middle planes by taking the areas corresponding to the same thickness information as a whole.

4. A finite element modeling method as claimed in claim 3, wherein the target solid midplane comprises: a plurality of sub-middle planes; each sub-median plane corresponds to corresponding thickness information;

the splitting the target entity midplane into a plurality of basic entity midplanes by taking the areas corresponding to the same thickness information as a whole, including:

taking the sub-median planes corresponding to the same thickness information as a set to obtain a plurality of sub-median plane sets;

and aiming at each sub-middle-plane set, combining the sub-middle planes in the sub-middle-plane set to obtain a corresponding basic entity middle plane.

5. A finite element modeling method as claimed in claim 1, wherein the target entity midplane comprises: a plurality of sub-middle planes;

splitting the target entity midplane into a plurality of base entity midplanes, comprising:

taking the sub-middle planes corresponding to one basic entity as a set to obtain a plurality of sub-middle plane sets;

and aiming at each sub-middle surface set, merging the sub-middle surfaces in the sub-middle surface set to obtain a corresponding basic entity middle surface.

6. A finite element modeling method as claimed in claim 1, wherein said assigning a material property corresponding to each of said elementary solids to a respective elementary solid midplane comprises:

summarizing the corresponding relation between the middle surface of the basic entity and the material attribute corresponding to each basic entity;

and based on the summarized content, assigning the material attribute corresponding to each basic entity to the corresponding basic entity middle surface.

7. A finite element modeling method as claimed in claim 1, wherein said merging at least two of said base entities into one target entity further comprises:

and preprocessing the three-dimensional model.

8. A finite element modeling method as claimed in claim 7, wherein the pre-processing the three-dimensional model comprises:

performing at least one of the following preprocessing operations on the three-dimensional model:

aligning the plates of the basic entity;

filling gaps among the basic entities;

and removing the chamfer of the basic entity.

9. A finite element modeling apparatus, comprising:

the acquisition module is used for acquiring basic entities of a three-dimensional model of a structural part and material attributes corresponding to the basic entities, wherein the basic entities comprise at least two basic entities;

the extraction module is used for combining at least two basic entities into one target entity and extracting the middle plane of the target entity to obtain a middle plane of the target entity;

the splitting module is used for splitting the target entity middle plane into a plurality of basic entity middle planes, and each basic entity middle plane corresponds to a corresponding basic entity one by one;

and the giving module is used for giving the material attribute corresponding to each basic entity to the corresponding basic entity middle surface to obtain the finite element model.

10. An electronic device, comprising:

a processor;

a memory for storing the processor-executable instructions;

the processor for performing the finite element modeling method of any of the preceding claims 1-8.

Images