JP6647777B2 - Method and program for generating structural analysis data using three-dimensional drawing data - Google Patents

Description

  The present invention relates to the design of a structure by computer graphics technology, using the three-dimensional drawing data created by modeling software or CAD (Computer Aided Design) software, and by using the deformability, vibration characteristics or strength of the structure. The present invention relates to a method and a program for generating structural analysis data for executing the verification of the above.

  In the design of various structures such as transport equipment such as ships and automobiles, buildings, etc., in the old days, target shape data (lines and surfaces) or three-dimensional elements are drawn on graph paper, and node numbers and element numbers are written and coordinates. ASCII files were created by picking up the configuration node numbers. However, in recent years, not only computer hardware but also software has been remarkably developed, and software with a three-dimensional shape creation tool and an automatic mesh division function has also been developed. Work can be efficiently performed using a mesh generator or the like which is application software for creating data for numerical analysis such as the finite element method (for example, see the following prior art document).

JP-A-5-290015 JP-A-6-119418

  However, among the above-described conventional techniques, data creation using a grid paper or the like is in a situation in which the storage capacity of the memory of the computer has dramatically increased, so that it is not possible to handle human resources to the extent that computational resources can be effectively used. .

  There is no problem for a numerical analysis engineer to work with a method using dedicated software such as a mesh generator, but for an engineer who does not work, methods such as space recognition and application usage are required. Due to problems, it is often not convenient.

  The present invention has been made in view of the above points, and the technical subject thereof is that computer graphics software such as CAD and modeling software is basically used. Another object of the present invention is to provide a method capable of generating structural analysis data without using special application software such as.

請 Motomeko structural analysis data generation method using the three-dimensional drawing data according to one aspect of the present invention, the processor of the computer, the steps of displaying a three-dimensional drawing data, wherein the processor is from the three-dimensional drawing data extracting condensed promised structural shape data on the surface material is a wire and two-dimensional data is one-dimensional data, wherein the processor is node at the junction of the one-dimensional data and the two-dimensional data before Ki構 shaped like data and generating formed a mesh model, wherein the processor is a constraint and loading conditions to each node that is displayed on the display unit by defining each composed shaped elements from the arrangement and connection of each node to embedded boundary conditions, produce structural analysis data by incorporating a physical property information including the thickness and rigidity to the respective front Symbol shape element A step that, said processor, and a step of displaying the structural analysis data on the display unit, the three-dimensional drawing data is drawing data of a building, in the step of extracting the structural shape data, the Recognize the pillars and beams as wire rods and floors and walls as face materials from drawing data. If the coordinates of the converted wire are shifted from the surface material from which the neutral surface was poured, the shift is corrected, and at the corner of the structure, the coordinates of the cored wire are extracted from the neutral surface. modify the off if you have deviated from the intersection of wood.

  According to a second aspect of the present invention, there is provided a method for generating structural analysis data using three-dimensional drawing data, wherein the three-dimensional drawing data is created using three-dimensional CAD software or modeling software. It is something.

According to a third aspect of the present invention, in the structure analysis data generating method using three-dimensional drawing data, the processor according to the first or second aspect further comprises: The method includes a step of subdividing the analysis mesh by increasing the number of nodes and shape elements.

A structure analysis data generating program using three-dimensional drawing data according to the invention of claim 4 is a program for causing a computer to execute the method according to any one of claims 1 to 3 .

  According to the method for generating structural analysis data using three-dimensional drawing data according to the present invention, data necessary for numerical analysis such as deformability, vibration characteristics, and strength characteristics of a structure is converted by CAD software or modeling software. Since the data can be generated from the three-dimensional drawing data without using special special application software, it is possible to shorten the work time, reduce the number of man-hours, and facilitate the work itself.

FIG. 2 is a block diagram illustrating a schematic configuration of a processing device that executes a method for generating structural analysis data using three-dimensional drawing data according to the present invention. 3 is a flowchart showing a preferred embodiment of a method and a program for generating structural analysis data using three-dimensional drawing data according to the present invention. FIG. 3 is an explanatory diagram showing three-dimensional drawing data of a building created in a preferred embodiment of a method and a program for generating structural analysis data using three-dimensional drawing data according to the present invention. FIG. 3 is an explanatory diagram showing structural shape data extracted from three-dimensional drawing data of a building in a preferred embodiment of a method and a program for generating structural analysis data using three-dimensional drawing data according to the present invention. FIG. 7 is an explanatory diagram showing a process for extracting structural shape data in a preferred embodiment of a method and a program for generating structural analysis data using three-dimensional drawing data according to the present invention. FIG. 4 is an explanatory diagram showing the generated structural analysis data in a preferred embodiment of the method and the program for generating structural analysis data using three-dimensional drawing data according to the present invention. FIG. 4 is an explanatory diagram showing structural analysis data obtained by subdividing an analysis mesh in a preferred embodiment of the method for generating structural analysis data using three-dimensional drawing data according to the present invention.

  Hereinafter, a preferred embodiment of a method for generating structural analysis data using three-dimensional drawing data according to the present invention will be described with reference to the drawings.

  First, FIG. 1 shows a schematic configuration of a processing device for executing a method for generating structural analysis data using three-dimensional drawing data according to the present invention, that is, the processing device 1 is composed of a general-purpose personal computer or the like. A computing unit 11, an input unit 12, a storage unit 13, a display unit 14, and the like connected to the computing unit 11.

  The arithmetic unit 11 is composed of a CPU (Central Processing Unit), creates three-dimensional drawing data in a file format such as DXF using CAD software or modeling software, and converts the three-dimensional drawing data into one-dimensional data and two-dimensional data. Various arithmetic processes such as extraction of contracted structural shape data, arrangement of nodes in the structural shape data, definition of shape elements, and generation of structural analysis data are performed. Note that DXF (Drawing Exchange Format) is a file format used in "AutoCAD" which is CAD software from Autodesk, and is a standard format for storing two-dimensional or three-dimensional data.

  The input unit 12 includes a keyboard, a mouse, and the like, and is means for an operator to operate various settings, input data, and process data.

  The storage unit 13 stores a program for causing the processing apparatus 1 to execute the structural analysis data generation method according to the present invention and data obtained by the program, that is, a step of generating three-dimensional drawing data by the calculation unit 11, Dimensional drawing data, processing steps for extracting structural shape data from the three-dimensional drawing data, and defining the structural elements formed by the extracted structural shape data, nodes of each structural shape data, and connections of the nodes. A mesh automatic division processing step for automatically generating a structural analysis data by automatically dividing the mesh by inputting the boundary condition to each of the nodes and inputting the physical property information to each of the shape elements. It comprises a hard disk, various memories, etc., capable of storing structural analysis data, etc.

  The display unit 14 is a liquid crystal display that displays three-dimensional drawing data processed by the arithmetic unit 11, structural shape data, structural analysis data, data stored in the storage unit 13, input data from the input unit 12, and the like. It becomes.

  FIG. 2 is a flowchart showing a preferred embodiment in which the structure analysis data generation method using three-dimensional drawing data according to the present invention is applied to the design of a building. That is, in this structure analysis data generation method, FIG. , A 3D entity model of a building is rendered in a file format such as DXF using CAD software or modeling software such as Google SketchUp, or the CAD software or modeling software The three-dimensional drawing data drawn by the above and recorded in the storage unit 13 is read (step S101).

  The three-dimensional drawing data 2 of the building shown in FIG. 3 can easily and visually grasp the completed state of the building composed of a plurality of structural elements such as columns 21, beams 22, and floors 23. However, since it is a solid model that simply represents the completed state visually, it is not possible to technically directly examine the deformability, vibration characteristics, strength, etc. of the building based on such data. Thus, line drawing-like structural shape data 3 reduced to one-dimensional data and two-dimensional data as shown in FIG. 4 is extracted from the three-dimensional drawing data 2 (step S102).

  The structural shape data 3 recognizes, for example, columns 21, beams 22, floors 23, walls (not shown in this example) and the like from a solid model based on the three-dimensional drawing data 2 shown in FIG. For 22, linearly extending linear members (wires 31 and 32), such as the core wire and the neutral axis, are extracted, and for the floor 23 and the wall, they are spread two-dimensionally such as their centroids and neutral planes. The conversion for extracting the thin plate-shaped member (face material 33) is performed. In other words, the structural shape data 3 extracted in this processing step S102 is constituted by geometric shape elements such as lines and planes obtained by removing the thickness elements and connecting the center of gravity, centroid, neutral axis, and neutral plane. Have been.

  When extracting the structural shape data 3, it is necessary to appropriately associate the positional relationship of columns, beams, walls, floors, and the like. For example, as shown in FIG. When the coordinates of the wire 31 extracted by the detection of the core wire of the object are shifted from the surface material 34 extracted by the detection of the neutral surface of the wall, or as shown in FIG. In the corner portion, when the coordinates of the wire 31 extracted by the detection of the core line of the column are shifted from the intersection of the face 34 extracted from the wall, when the load is applied to the structure, the deformation occurs. In order to suppress the occurrence, a correction such as moving the wire 31 or the face material 34 to an appropriate position is performed.

  Next, in order to convert the structural shape data 3 composed of a combination of the one-dimensional data and two-dimensional data extracted as described above into numerical analysis data, an automatic mesh division program is used as shown in FIG. And a linear element (truss element or beam element) formed by a process of arranging nodes N at joints of the wires 31 and 32 and the face material 33 and connecting the coordinates of two nodes N adjacent to each other with a straight line. The mesh model 4 is created by defining a shape element E of the analysis mesh such as a thin plate element formed by a process of connecting the coordinates of three or more nodes N with straight lines (step S103).

  When it is determined that it is necessary to perform more detailed numerical analysis (step S104 = YES), the nodes N are further increased and arranged as shown in FIG. The subdivided shape element E is also defined in an appropriate form (step S105).

  In the mesh model 4 created in this manner, each node N incorporates appropriate boundary conditions such as constraint conditions and load conditions, and each shape element E stores information such as material properties such as thickness and rigidity. By incorporating (Step S106), a mesh model (structural analysis data) capable of performing a numerical analysis by the structural analysis software is obtained. In order to reduce the load of analysis, the mesh model 4 created in step S103 is not subdivided first (step S104 = NO), and the boundary conditions and material properties are incorporated in step S106 by structural analysis software. After performing the numerical analysis, the process may return to step S104 to determine whether it is necessary to perform detailed analysis with higher accuracy by subdividing the mesh.

  As described above, according to the present invention, three-dimensional drawing data created by three-dimensional CAD software or modeling software or the like is converted into one-dimensional and two-dimensional contracted line drawing structural shape data 3. In addition, since the mesh model 4 for numerical analysis is generated without using special application software for exclusive use, the work time can be reduced, the number of work steps can be reduced, and the work itself can be facilitated.

  In the above-described embodiment, the description has been given assuming that the drawing data in the DXF file format is used as an example of the input three-dimensional drawing data. However, the present invention is not limited to this. The STL format data of the modeled three-dimensional shape data may be read, or the modeling data by Google SketchUp or the like may be directly used.

DESCRIPTION OF SYMBOLS 1 Processing device 2 3D drawing data 3 Structural shape data 31, 32 Wire rod 33 Surface material N Node E Shape element

Claims (4)

A processor of the computer displaying the three-dimensional drawing data on the display unit;
A step in which the processor extracts, from the three-dimensional drawing data, structural shape data reduced to a wire that is one-dimensional data and a face material that is two-dimensional data;
Generating a mesh model by the processor, place the node at the junction of the one-dimensional data and the two-dimensional data before Ki構 shaped like data define each composed shaped element from connection of each node,
A step of the processor, the embedded boundary conditions including constraints and loading conditions on each node, to generate the structural analysis data by incorporating a physical property information including the thickness and rigidity to the respective front Symbol shape element,
The processor displays the structural analysis data on the display unit,
Equipped with a,
The three-dimensional drawing data is drawing data of a building,
In the step of extracting the structural shape data,
Recognize the pillars, beams, and floors, floors and walls that are wire rods from the drawing data,
Pillars and beams that are wires are cored,
Floors and walls, which are face materials, extract neutral surfaces,
If the coordinates of the cored wire is shifted from the surface material from which the neutral surface was poured, correct the shift,
In the corner portion of the structure, if the coordinates of the cored wire are shifted from the intersection of the surface material from which the neutral plane is extracted, correct the shift,
Structural analysis data generation method using the three-dimensional drawing data, wherein the this.   The method according to claim 1, wherein the three-dimensional drawing data is created using three-dimensional CAD software or modeling software. After the step of defining the shape element with placing node, said processor 3D of claim 1 or 2, characterized in that it comprises the step of subdividing the analysis mesh by increasing the nodes and shape elements A method for generating structural analysis data using drawing data. A structural analysis data generation program using three-dimensional drawing data, the program causing a computer to execute the method according to any one of claims 1 to 3 .

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