Finite element automatic connection device and method based on mixed mode and storage medium

Abstract

The invention discloses a finite element automatic connection device based on a mixed mode. The finite element automatic connection device comprises a modeling information read-in module, a connection preprocessing module and a connection creating module. Wherein the modeling information read-in module reads reference node position coordinates directly input externally, connection component information input externally, to-be-connected component information and other connection related information through modeling equipment; the connection preprocessing module screens and classifies the read-in information, extracts connection information and creates related reference node information; and the connection creation module creates finite element connections of the positions where the reference nodes are located one by one according to the determined multiple reference nodes. And the connection output module outputs the connection information, stores the connection information in a storage medium or connects the connection information with an existing finite element model. According to the scheme, the finite element modeling efficiency is effectively improved, the modeling accuracy is improved, and the prediction accuracy of the model is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of finite element modeling. Specifically, it relates to a finite element automatic connection device, method, and storage medium based on a hybrid mode. Background Art

[0002] The finite element method is a numerical method applied to solve the numerical solutions of complex equation systems. Due to its excellent characteristics, it is widely used to solve practical problems on complex domains (such as automobiles, ship hulls, airplanes, civil engineering, etc.). For example, a method for calculating transformer losses and optimizing the structure based on the finite element method with the patent application number 202411078885.7 demonstrates its application in the field of transformer loss calculation and optimization.

[0003] Before the finite element method is specifically applied to solve problems in the engineering field, finite element preprocessing of the actual model is required. In this process, the number of finite element units established in each region and system is numerous, the types are complex, and the attributes are different. Among them, there is a lack of an automatic method for establishing connections between regions, systems, and meshes. Establishing relevant connections often consumes a large amount of resources and is difficult to check. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a finite element automatic connection device and method based on a hybrid mode. This method effectively improves the efficiency of finite element modeling, increases the accuracy of modeling, and improves the prediction accuracy of the model.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A finite element automatic connection device based on a hybrid mode includes a modeling information reading module, a connection preprocessing module, and a connection creation module. Among them, the modeling information reading module reads the coordinates of the reference node positions directly input externally, the connection component information input externally, the component information to be connected, and other connection-related information through a modeling device.

[0007] The connection preprocessing module screens and classifies the read information, extracts the connection information, and creates relevant reference node information.

[0008] The connection creation module creates finite element connections at the positions where the determined multiple reference nodes are located one by one.

[0009] The device further includes a connection output module, which outputs and stores the connection information in a storage medium or connects the connection information to an existing finite element model.

[0010] The information reading module includes an external information reading script and a GUI. The external information reading script is used to read information, and the GUI is used to implement user interaction.

[0011] The connection preprocessing module includes a diagnostic script. The diagnostic script diagnoses the information read by the information reading module, throws out the information with errors, forms a record, and displays it on the GUI.

[0012] The connection preprocessing module also includes a connector information template and a preprocessing program. The preprocessing program processes each connector one by one, compares the connector with a preset template according to its geometric form, material properties, weight, relative position coordinates, absolute position coordinates, centroid, center of gravity, moment of inertia, name, version information, etc., and filters out the unnecessary connectors and their information, and publishes the qualified connectors; the connector information template is stored in a storage medium, and preset template information is obtained based on the connector information template; the preprocessing program records the proposed connectors and displays them on the GUI for monitoring and confirmation.

[0013] The connection preprocessing module also includes a reference node generation program and a data processing program. The reference node generation program processes the filtered connector information and generates reference node position coordinates; the data processing program uniformly stores the finite element unit information, finite element node information, finite element mesh information, reference node position, and reference node label read by the information reading module in the form of multi-dimensional matrices, multi-dimensional arrays, or dictionaries or other data forms supported by modeling devices and memories.

[0014] The connection creation module includes a potential connection point judgment program, a connection point inspection module, and a connection generation program; among them, the potential connection point judgment program first reads in the reference node position, searches for surrounding finite element nodes according to the search radius, and the obtained finite element nodes are candidate connection nodes. According to the part to which the candidate connection node belongs, the unit type and attributes of the candidate connection node, the position relationship between the candidate connection node and the reference node, the position relationship between each candidate connection node, and the position of the candidate connection node in the part to which it belongs, determine the sensitivity value of the candidate connection node, and judge whether the candidate connection node is selected according to the sensitivity value;

[0015] The connection point inspection module judges each reference node in the group to which the updated reference node belongs one by one in a traversal or random or iterative manner. The reference nodes that fail the judgment are re-run through the potential connection point judgment program; this loop continues until the termination condition of the connection creation module is met; the connection point inspection module calculates and judges the dependencies, node conflicts, and correctness of the node DoF of the connection nodes;

[0016] The connection generation program reads the property information of the connection parts, reference node information, and connection point information, generates different connection units, and generates different types of property units such as mass units and elastic units attached to the reference nodes and connection points to simulate the physical and geometric characteristics of the connection units.

[0017] The connection output module includes a connection information output program and a connection information implementation program; the connection information output program outputs the connection information to the memory for subsequent retrieval or outputs a specified format file required by the finite element simulation platform; the connection information implementation program connects the previously generated reference nodes, connection nodes, and different types of property units such as mass units and elastic units to the finite element model of the connected component.

[0018] A finite element automatic connection method based on a hybrid mode, the method includes developing and implementing a modeling information input module, a connection preprocessing module, a connection creation module, and a connection output module; realizing finite element automatic connection through the modeling information input module, the connection preprocessing module, the connection creation module, and the connection output module;

[0019] Among them, the modeling information input module reads the position coordinates of the reference nodes directly input externally, the connection component information input externally, the component information to be connected, and other connection-related information through a modeling device;

[0020] The connection preprocessing module screens and classifies the read information, extracts the connection information, and creates relevant reference node information creation;

[0021] The connection creation module creates finite element connections at the positions where the determined multiple reference nodes are located one by one; the connection output module outputs and stores the connection information in a storage medium or connects the connection information to an existing finite element model.

[0022] A computer-readable storage medium, in which at least one instruction is stored, and the instruction is loaded and executed by a processor to execute the method or execute the modeling information input module, the connection preprocessing module, and the connection creation module in the finite element automatic connection device.

[0023] The advantages of the present invention are as follows: 1. The present invention adopts a connection node screening method based on a hybrid mode, expands the range of screening units, improves the screening speed, reduces screening errors, and improves the integrity of screening connection points.

[0024] 2. In the preprocessing stage of reading information, the present invention screens connection parts, finite element nodes, finite element units, and finite element meshes, reduces the calculation amount of the automatic connection system, and improves the program operation efficiency.

[0025] 3. In the modeling information reading module and the connection creation module of the present invention, a GUI is added to improve the reliability of information reading and the robustness of connection creation through manual intervention.

[0026] 4. In the connection output module of the present invention, multiple output methods are set. It can either directly output connections in a specified format or directly connect connection units to an existing finite element model, improving the usability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0028] Figure 1 Schematically shows the overall implementation flowchart of the finite element automatic connection method according to an embodiment of the present disclosure.

[0029] Figure 2 Schematically shows the flowchart of the preprocessing program for screening connection parts according to an embodiment of the present disclosure.

[0030] Figure 3 Schematically shows the connection creation module according to an embodiment of the present disclosure.

[0031] Figure 4 Schematically shows the block diagram of an electronic device suitable for implementing the finite element automatic connection method according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further details the specific embodiments of the present invention by describing the optimal embodiments with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that when a component or unit or node is referred to as "connected to" another component or unit or node, it can be directly on the other component or unit or node or there may also be an intermediate component or unit or node. When a component or unit or node is considered to be "connected" to another component or unit or node, it can be directly connected to the other component or unit or node or there may be an intermediate component or unit or node at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed types.

[0035] The object of this patent is to overcome the problems of the prior art and provide a finite element automatic connection method, system, device and storage medium based on a hybrid mode. This solution reads the reference node position information directly input externally, the attributes and finite element information of the connection components input externally, and other connection-related information through a modeling device. The absolute position of the connection reference node is calculated by a calculation program in the modeling device. Data processing is performed on the reference node information, element information, node information, and mesh information of the finite element model by a calculation program in the modeling device. The connection creation module searches for connection nodes connected to the reference node according to the reference node by means of traversal, iteration, loop, etc. and creates the connection units preset by the program. During this process, exceptions are thrown for the reference node and connection node being created and displayed on the GUI. After the connection creation module is completed, the automatically generated connection is checked and automatically corrected, with automatic iteration during the process. Finally, the connection information is output and stored in the storage medium or the connection information is connected to the existing finite element model.

[0036] As Figures 1-4 shown, for the finite element automatic connection method, system, device and storage medium based on a hybrid mode in this embodiment, the system and method include:

[0037] Modeling information reading module:

[0038] The information reading module includes a reading program for reading preset reference node information, geometric information of the connection components input externally, finite element model information, and other connection-related information;

[0039] The information reading module includes an external information reading script and a GUI (Graphical User Interface);

[0040] The information reading module reads the reference node position coordinates directly input externally, the connection component information input externally, the information of the component to be connected, and other connection-related information through the modeling device;

[0041] Specifically, the information read for the connecting component and the connected component includes the geometric form, material properties, weight, relative position coordinates, absolute position coordinates, centroid, center of gravity, moment of inertia, name, version information, finite element unit information, finite element node information, finite element mesh information, etc. of the connecting component and the connected component.

[0042] Connection preprocessing module:

[0043] The connection preprocessing module screens and classifies the read-in, extracts the connection information, and creates relevant reference node information.

[0044] The connection preprocessing module includes a diagnostic script that diagnoses the information read by the information reading module, throws out the information with errors, and forms a record, which is displayed on the GUI.

[0045] The connection preprocessing module includes a connecting component information template, which is stored in a storage medium.

[0046] One feature of the connection preprocessing module is that it includes a preprocessing program for processing the read-in information.

[0047] As Figure 2 shown, the preprocessing program processes each connecting component one by one, compares the connecting component with the preset template according to its geometric form, material properties, weight, relative position coordinates, absolute position coordinates, centroid, center of gravity, moment of inertia, name, version information, etc., screens it, eliminates the unnecessary connecting components and their information, and publishes the qualified connecting components.

[0048] Among them, the program will record the eliminated connecting components and form a record, which is displayed on the GUI for manual monitoring and confirmation.

[0049] The connection preprocessing module includes a reference node generation program that processes the screened connecting component information and generates reference node position coordinates according to its material properties, weight, relative position coordinates, absolute position coordinates, centroid, center of gravity, etc.

[0050] Furthermore, according to the connecting component information and other externally input information, the reference nodes are classified and reference node labels are added to facilitate the subsequent generation of corresponding connection units.

[0051] The connection preprocessing module includes a data processing program that stores the finite element unit information, finite element node information, finite element mesh information, reference node positions, and reference node labels read by the aforementioned information reading module in a multi-dimensional matrix, multi-dimensional array, dictionary, or other data forms supported by modeling devices and memories for subsequent data reading.

[0052] Connection creation module:

[0053] As shown Figure 3 in the figure, the connection creation module creates the finite element connections at the positions of the reference nodes one by one in a traversal, loop, random throwing, etc. manner according to the determined multiple reference nodes described above. The connection creation module includes a potential connection point judgment program, which first reads in the positions of the reference nodes and searches for the surrounding finite element nodes according to the search radius R s The search radius R s is calculated as follows:

[0054] R s = k p ·k cp ·max(k1·L key1 , k2·L key2 )

[0055] where k p represents the material property factor of the connecting piece, k cp represents the connecting piece label factor, L key1 and L key2 represent the key dimension 1 and key dimension 2 of the connecting piece respectively, and k1 and k2 represent the control factors of the two key dimensions. The finite element nodes obtained by the search are the candidate connection nodes.

[0056] Furthermore, the potential connection point judgment program determines the sensitivity value of the candidate connection nodes according to the component to which the candidate connection nodes belong, the unit type and attributes to which the candidate connection nodes belong, the positional relationship between the candidate connection nodes and the reference nodes, the positional relationship between the candidate connection nodes, and the position of the candidate connection nodes in the component to which they belong The standard for whether a candidate connection node is selected is:

[0057]

[0058] where j represents the index value of the candidate connection node, and C index represents the sensitivity judgment threshold of the candidate connection node.

[0059] Even further, the sensitivity value judgment mixes multiple indicators. In this embodiment, these indicators include but are not limited to: the component to which the candidate connection node belongs, the unit type and attributes to which the candidate connection node belongs, the positional relationship between the candidate connection node and the reference node, the positional relationship between the candidate connection nodes, and the position of the candidate connection node in the component to which it belongs.

[0060] In a preferred embodiment, is calculated as follows:

[0061]

[0062] where ktype With k dis They represent the unit type index of the candidate connection node and the generalized distance index between the candidate connection node and the reference node, respectively. plance and k alxe They represent the node plane compliance index and the axial cylinder compliance index, respectively, and k shape and n ar They represent the shape fitting index of the connection point and the number of units around the connection node respectively.

[0063] In this embodiment, a specific implementation method for selecting the connection nodes to be selected is:

[0064] The relevant dimension information L of the connector is obtained from the information reading module key1 and L key2 And the center of mass O. The three-dimensional range is thus limited, and the boundary of the three-dimensional range is recorded as δ. The units within this range are included in the screening process, and the unit attributes, node information, and information such as the connection components to which the unit belongs are stored in the storage medium. The key geometric reference for node screening is established based on the geometric information of the connector. The unit node I included in the screening range forms a vector IO with the center of mass O, and the angle θ (less than or equal to the target value) between IO and the axial value of the connector is calculated. Nodes I with the same angle are classified into a node class Ti, and the angles calculated for different nodes are θ i (There may be some error between the angles, and points with different angles will be processed again later.) For node I on a two-dimensional connection component, the unit size is proportional to θ i The influence of setting the influence coefficient k, angle θ i k points are eliminated; for the nodes of the three-dimensional connected components, select θ i Take the node class Tk at the minimum value and search for adjacent nodes along the axial direction of the connector as candidate connection nodes.

[0065] A feature of the connection creation module is that it includes a connection node checking module, which judges the reference nodes in the group to which the updated reference node belongs one by one in a traversal, random or iterative manner, and re-performs the potential connection point judgment procedure for the reference nodes that fail to be judged, and repeats the cycle until the termination condition of the connection creation module is met.

[0066] The aforementioned connection node checking module mainly calculates the correctness of connection node dependencies, node conflicts, node DoF (Degree of Freedom), etc.

[0067] Another feature of the connection node inspection module is that the connection units modified during the inspection process are displayed on the GUI, which facilitates manual intervention in the creation of connections and improves the reliability of the created connections.

[0068] The connection creation module includes a connection generation program which reads the aforementioned connector attribute information, refers to the node information and connection point information, generates different connection units, and generates different types of attribute units such as mass units and elastic units attached to the reference nodes and connection points to simulate the physical and geometric characteristics of the connection units.

[0069] Connection output module:

[0070] One feature of the connection output module is that it includes a connection information output program and a connection information implementation program.

[0071] Among them, the connection information output program is characterized in that it can output the connection information to the memory for subsequent retrieval and use.

[0072] Furthermore, the connection information output program can also output a specified format file required by a commercial finite element simulation platform for joint calculation with other model files.

[0073] One feature of the connection information implementation program is to connect the aforementioned generated reference nodes, connection nodes, and different types of attribute units such as mass units and elastic units to the finite element model of the connected component.

[0074] The flowcharts and block diagrams in the accompanying drawings of the embodiments of the present invention illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above-mentioned module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0075] The finite element automatic connection method based on the hybrid mode of the present invention can be applied to a finite element automatic connection creation system, which can be configured in any electronic device so that the electronic device can execute the finite element automatic connection modeling method proposed by the present disclosure.

[0076] The structural diagram of a typical electronic device that can complete the finite element automatic connection method is as Figure 4 shown. It should be noted that Figure 4The electronic device shown is only an example and should not impose any limitations on the functions and scope of use of the embodiments of the present application. As Figure 4 shown, the electronic device includes a central processing unit (CPU) E01, which can load data or programs stored in a read-only memory (ROM) E02 or data or programs from a storage unit E04 or an external removable storage medium read from an I / O unit E05 into a random access memory (RAM) E03, so as to perform various actions and processes, such as executing the methods described in the above embodiments. The display and operation unit E06 includes devices such as a mouse and a keyboard that can perform input, and also includes output devices such as various types of displays and speakers.

[0077] The device for finite element connection automated modeling based on a hybrid mode according to the present invention is characterized in that the modeling device includes: a memory, a processor, and a program stored on the memory for the modeling method of the aforementioned finite element automatic connection.

[0078] The memory is used to store a program for implementing the modeling method of finite element automatic connection;

[0079] The processor is used to execute the program for implementing the modeling method of the finite element automatic connection to implement the steps of the modeling method of the finite element automatic connection described in any one of the foregoing.

[0080] The present invention also provides a computer-readable storage medium, which is characterized in that a program for implementing the modeling method of finite element automatic connection is stored on the storage medium, and the program for implementing the modeling method of finite element automatic connection is executed by a processor to implement the steps of the modeling method of the finite element automatic connection described in any one of the foregoing.

[0081] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In practical applications, the above functions can be allocated to different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application.

[0082] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art are not described.

[0083] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A finite element automatic connection device based on a hybrid mode, characterized in that: It includes modeling information reading module, connection preprocessing module and connection creation module; The modeling information reading module reads the reference node position coordinates directly input from the outside, the connection component information input from the outside, the component information to be connected, and other connection-related information through the modeling device; The connection preprocessing module filters and classifies the read information, extracts the connection information, and creates relevant reference node information; The connection creation module creates finite element connections at locations where the reference nodes are located one by one according to the determined multiple reference nodes.

2. The finite element automatic connection device based on the hybrid mode according to claim 1, characterized in that: The device further comprises a connection output module, which outputs the connection information, stores it in a storage medium, or connects the connection information with an existing finite element model.

3. The finite element automatic connection device based on the hybrid mode according to claim 1 or 2, characterized in that: The information reading module includes an external information reading script and a GUI, wherein the external information reading script is used to read information, and the GUI is used to realize user interaction.

4. The finite element automatic connection device based on the hybrid mode according to claim 1 or 2, characterized in that: The connection preprocessing module includes a diagnostic script, which diagnoses the information read by the information reading module, discards the erroneous information, forms a record, and displays it on the GUI.

5. The finite element automatic connection device based on the mixed mode according to claim 4, characterized in that: The connection preprocessing module also includes a connector information template and a preprocessing program. The preprocessing program processes the connectors one by one, compares the connectors with the preset template according to their geometric form, material properties, weight, relative position coordinates, absolute position coordinates, center of mass, center of gravity, moment of inertia, name, version information, etc., and screens them, eliminates unnecessary connectors and their information, and publishes connectors that meet the conditions; the connector information template is stored in a storage medium, and the preset template information is obtained based on the connector information template; the preprocessing program records the proposed connectors and displays them on the GUI for monitoring and confirmation.

6. The finite element automatic connection device based on the mixed mode according to claim 4 or 5, characterized in that: The connection preprocessing module also includes a reference node generation program and a data processing program. The reference node generation program processes the filtered connection information and generates reference node position coordinates; The data processing program uniformly stores the finite element unit information, finite element node information, finite element mesh information, reference node positions and reference node labels read by the information reading module into a multi-dimensional matrix, multi-dimensional array or dictionary or other data forms supported by modeling devices and storage.

7. The finite element automatic connection device based on the mixed mode according to claim 1 or 2, characterized in that: The connection creation module includes a potential connection point judgment program, a connection point inspection module and a connection generation program; wherein the potential connection point judgment program first reads in the reference node position, and searches for the surrounding finite element nodes according to the search radius, the finite element nodes obtained by the search are the candidate connection nodes, and the sensitivity value of the candidate connection node is determined according to the component to which the candidate connection node belongs, the unit type and attribute to which the candidate connection node belongs, the positional relationship between the candidate connection node and the reference node, the positional relationship between each candidate connection node, and the position of the candidate connection node in the component to which it belongs, and whether the candidate connection node is selected is determined according to the sensitivity value; The connection node check module judges the reference nodes in the group to which the updated reference node belongs one by one in a traversal, random or iterative manner, and the reference nodes that fail to be judged re-perform the potential connection point judgment procedure; this cycle continues until the termination condition of the connection creation module is met; the connection node check module calculates and judges the correctness of the connection node dependency, node conflict, and node DoF; The connection generation program reads the connection property information, reference node information, and connection point information to generate different connection units, and generates different types of property units such as mass units and elastic units attached to the reference nodes and connection points to simulate the physical and geometric characteristics of the connection units.

8. The finite element automatic connection device based on the mixed mode according to claim 1 or 2, characterized in that: The connection output module includes a connection information output program and a connection information implementation program; the connection information output program outputs the connection information to the memory for subsequent retrieval or outputs a specified format file required by the finite element simulation platform; the connection information implementation program connects the aforementioned generated reference nodes, connection nodes, and different types of attribute units such as mass units and elastic units with the finite element model of the connected component.

9. The finite element automatic connection method based on the mixed mode is characterized by: The method comprises developing and implementing a modeling information reading module, a connection preprocessing module, a connection creation module, and a connection output module; realizing automatic connection of finite elements through the modeling information reading module, the connection preprocessing module, the connection creation module, and the connection output module; The modeling information reading module reads the reference node position coordinates directly input from the outside, the connection component information input from the outside, the component information to be connected, and other connection-related information through the modeling device; The connection preprocessing module filters and classifies the read information, extracts the connection information, and creates relevant reference node information; The connection creation module creates finite element connections at locations where the reference nodes are located one by one according to the determined multiple reference nodes; The connection output module outputs the connection information, stores it in a storage medium, or connects the connection information with an existing finite element model.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one instruction, which is loaded by the processor and executes the method of claim 9 or executes the modeling information reading module, connection preprocessing module, and connection creation module in the finite element automatic connection device as described in claims 1-8.

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