JPH09231345A - Device for recognizing joined state of model - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discriminate the joined/non-joined state of plate elements of parts in the structure analysis of a parts model. SOLUTION: In the case of joining plate elements A, B, shape parameters included in each node are counted. Since a shape parameter is specific to each plate element, two or more different shape parameters are included in each node of a joined part. Shared nodes 21, 25 judged as nodes having two or more shape parameters generate beam elements 22, 24 of length corresponding to the number of joints and the elements 22, 24 are displayed so as to be superposed with a model. Since a beam element of a node 26 which is not joined on data is not displayed, the joined/non-joined state of a joining part can be grasped at a glance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model joint state recognition device, and more particularly to a device applied to a joint model joint state recognition device.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique of performing structural analysis of an object using a computer. For example, in a CAD diagram input / output analysis method and apparatus disclosed in Japanese Patent Application Laid-Open No. 4-347775, various analyzes of a component model are performed using component shape data generated by a CAD diagram creation device. Here, when performing various analyzes of the part model, there are cases where the specific parts of the part model itself are joined or other parts are joined, and the operator specifies the nodes of the plate elements that make up the part model. Then joined.

[0003]

However, even if the nodes of the plate elements appear to be jointed to each other, they may not be jointed on the data due to the limit of the accuracy of the hardware or software of the component producing apparatus. is there.

FIG. 6 shows a plate element 1 and a plate element 2 as an example.
The case of joining is shown. In this case, the nodes (1a, 1b, 1c in the figure) of the joint part of the plate element 1 and the nodes (2a, 2b, 2c in the diagram) of the joint part of the plate element 2 are designated and joined, but the display limit It looks like Fig. 6
Even when the state of (A) is changed to the state of FIG. 6 (B), in the data of the portion A in the figure, the nodes of the joint portion are vertically displaced as shown in FIG. 7 (A), or As shown in FIG. 7 (B), it may be in a non-bonded state. In this way, if the joints are apparently joined but not joined in the data, it may cause an error or error when performing structural analysis at the time of collision, etc. there were. Of course, it is conceivable to carefully check the joints one by one, but it is very difficult and impractical if the model to be handled is three-dimensional and has enormous data of about 50,000 mesh. .

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an apparatus capable of surely and quickly recognizing whether or not a joint portion of a model is joined in data. To provide.

[0006]

In order to achieve the above object, the first invention is a model created based on a specific data format, which is constructed by joining plate elements and nodes having shape parameters to each other. Model generating means for generating data, shared node generating means for setting a predetermined flag to a node having two or more different shape parameters among the nodes located at the joint part of the model data, the model data and It is characterized in that it has display means for superimposing and displaying the flag, and displays the flag at the common node of the joint portion of the model.

A unique shape parameter is added to each plate element. Therefore, the nodes constituting the plate element are
It will have the shape parameters of the plate element. If this node is joined to another plate element, it will have the shape parameter of the joined plate element in addition to the shape parameter of its own plate element. It can be judged from the data that they are joined. Then, a flag is set for this joined node (shared node), and this flag is displayed together with the model so that the nodes located at the joined site are also joined in the data by simply checking the presence or absence of the flag. or not,
That is, it is possible to easily identify whether or not there is a positional deviation or an unbonded state.

In order to achieve the above object, a second invention is the first invention, wherein the flag is a beam element having the common node as an end point, and the flags are different according to numbers having different shape parameters. It is characterized by changing the beam length.

As a result, when the data is also joined, a beam having a length corresponding to the number of joints is displayed at the node, so that the node can be joined by simply checking the beam length. You can easily grasp whether or not it has been done.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, taking a model collision analysis as an example.

FIG. 1 shows a conceptual diagram of this embodiment. The hardware includes an input / output device such as a keyboard, a mouse, and a printer, an input / output interface, and C
Workstation 1 including PU (MPU), ROM, RAM, memory such as external storage device, and display device such as CRT
00 is used. The basic structural analysis software is NASTRAN, and the collision model data 10 including plate elements and nodes are stored in the memory as the NASTRAN data. NA of this collision model data 10
Analyze with STRAN and analyze the degree of destruction. The collision model data 10 is a component model configured by joining a plurality of plate elements. The joining of the plate elements is performed by designating the nodes located at the joining portions of the respective plate elements as in the conventional case, and it is assumed that they are joined to each other as long as they are displayed on the display. Note that NASTRAN is a general-purpose structural analysis program developed by NASA in the United States, and its details are omitted.

The workstation 100 has a shared node conversion program 1 which is a feature of this embodiment.
2 is also installed, the collision model data 10 is processed by this shared node conversion program 12, and the shared node data 1
4 is generated. The shared node data 14 is data in which new nodes and beam elements are added to the shared nodes of the joint, and the beam elements function as flags. The common node data 14 including beam elements is the same as other data
Stored in memory in STRAN format. The collision model data 10 and the shared node data 14 are both supplied to the display device 16 and displayed in an overlapping manner. Specifically, the beam model image is added to the collision model data image. As a driver for superimposing and displaying both data, Generis (manufactured by ESI Japan) or the like can be used.

FIG. 2 shows node data and plate element data in NASTRAN format. FIG. 2A shows node data, “GRID” indicates that the type of data is a node, “ID” is the identification number of this node,
It is a number unique to each node. Also, "X", "Y",
“Z” is the coordinate value of the node. On the other hand, FIGS. 2B and 2C are plate element data, which represent triangular elements and quadrangular elements, respectively. That is, "CTRIA
“3” represents a triangular element, “CQUAD4” represents a quadrangular element, “EID” represents an identification number of a plate element, and “PI”.
“D” is a shape characteristic identification number (ID) unique to each plate element, which functions as a shape parameter in the present invention.
1 ”,“ G2 ”, ... Are identification numbers of the nodes forming the plate element. Such data is stored as the collision model data 10, and the shared node data 14 is generated from this data by using the shared node conversion program 12.

FIG. 3 shows a processing flowchart of the shared node conversion program. When the program is read into the RAM, first, all the nodal data and plate element data that make up the collision model data 10 are read (S101).
Next, the read nodes are sorted in the order of the grid ID, that is, the node identification number (S102). Then, the nodes sorted in sequence are read out, and the nodes G1 constituting the plate element are read.
.About.Gm, that is, whether the read node data is a plate element node or not (S103). In the case of a node of a plate element, the shape characteristic ID of that node (which must have a shape characteristic ID because it is a node of the plate element) is further checked to determine whether or not it already has the same shape characteristic ID. (S104). If it is a node of a plate element that is not joined, it is determined as YES, that is, the same ID because the shape characteristic ID has only the ID unique to that plate element, but if it is a node that is joined to another plate element. For example, since it is a common node of the original plate element and the joined plate element, it also has the shape characteristic ID of the joined plate element in addition to the original plate element's shape characteristic ID. . Therefore, in this case, NO, that is, it is determined to have different IDs, and a PID (shape characteristic ID) is added to the node (S
105).

When the above processing is performed for all node data (S106), the beam element generation processing is performed next. Specifically, first, the nodes are sequentially read out, and it is determined whether the nodes have two or more shape characteristic IDs (S1).
07). If the read node is a common node of the joint, it is determined as YES because it has two or more shape characteristic IDs as described above, and the new node GRID and the beam element C are added.
A BAR is generated (S108). The new nodal data and beam element data are NA as in the collision model data 10.
Created in STRAN format. On the other hand, when the read node does not have two or more PIDs different from each other, the next node is read and the same determination is performed. It should be noted that, for nodes that do not have two or more different PIDs, in addition to nodes that are not located at the joining site (for example, a node that is located at the center of the plate element), data that is located at the joining site is not joined or misaligned in data. Nodes having a single PID are included. The above processing is performed for all node data (S10
9), it is stored in the memory as the shared node data 14. By this processing, new nodes and beam elements are generated corresponding to the shared nodes, and no nodes that are located at the joints but are not joined or have misaligned in data are not generated.

FIG. 4 shows an example of new node data and beam element data generated as a result of the processing in S108. FIG. 4 (A) shows new node data, and “ID” is a new identification number (I other than the node of the collision model data).
D) is given. Further, the coordinates of “X”, “Y”, and “Z” are respectively 10 mm + α with respect to the coordinates (X0, Y0, Z0) of the node determined to have two or more PIDs in S107. The added value is added. here,
α is a variable determined according to the number of different PIDs,
For example, when joining two plate elements, the common node is 2
Since there are two different PIDs, α = 2, and the coordinates of the new node are X = X0 +12, Y = Y0 +12, Z = Z0.
It becomes +12. Also, when joining three plate elements, since the shared node has three different PIDs, α = 3
And the coordinates of the new node are X = X0 + 13, Y = Y0
+13 and Z = Z0 +13. On the other hand, FIG. 4B shows beam element data, where a new identification number of the beam element is given to “EID” and a new shape characteristic I of the beam element is given to “PID”.
D is given. Also, the ID of the common node that is the start point of the beam element (indicated by G1 in the figure) and the ID of the new node that is the end point of the beam element (indicated by G2 in the figure) are given. , The direction component of the vector determined by these start point and end point (in the figure, V1, V2
, V3). As described above, since the coordinates of the new node are determined according to the number of PiDs that the shared node has, it will be understood that the beam element length increases as the number of different PIDs increases.

As described above, the collision model data 10
And the shared node data 14 are both stored in the memory,
The workstation 100 superimposes and displays the collision model data 10 and the shared node data 14 on the display by using a predetermined display driver.

FIG. 5 shows an example in which the collision model data and the common node data are superimposed and displayed. This is the case where the plate elements A, B, and C are joined. In the figure, a white circle indicated by reference numeral 20 is a new node newly generated for the common node, and a reference numeral 22 is a beam element having the common node 21 and the new node 20 as both end points. Reference numeral 24 is a beam element having a common node 25. The common node 21 is located at three joints of the plate elements A, B, and C, and the common node 25
Is located at the two joint portions of the plate elements B and C. Therefore, the beam element 22 of the common node 21 is longer than the beam element 24 of the common node 25. On the other hand, although the node 26 is located at the joining portion, it is not joined in the data, that is, since it does not have a different shape characteristic ID (PiD), the beam element is not displayed and it can be easily understood that it is not joined.

As described above, in this embodiment, the beam element having the length corresponding to the number of joints is superimposed and displayed on the collision model data for the common node which is also jointed on the data. Can confirm at a glance which nodes are not joined in the data, and ensure the model generation.

The beam element is only one kind of the flag of the present invention, and it is possible to display only the shared nodes having different shape characteristic IDs in different colors. In this case, the color type functions as a flag. Further, in this case, it may be possible to further change the color depending on the number of joints. For example, on the data, unjoined nodes are white, shared nodes having two connections are red, shared nodes having three connections are blue, and so on.

Further, in this embodiment, in particular, NASTRA
Although the collision model using N has been described, it is needless to say that the present invention is not limited to this and is applicable to general component models created using a CAD device. As the shape parameter, any parameter can be used as long as it recognizes the elements constituting the part as a unit.

[0022]

As described above, according to the present invention,
It is possible to surely and quickly recognize whether or not the joined portion of the model is joined in the data.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a system according to an embodiment of the present invention.

FIG. 2 is a data format diagram of nodes and plate elements.

FIG. 3 is a flowchart of shared node conversion processing.

FIG. 4 is a data format diagram of new nodes and beam elements.

FIG. 5 is an explanatory diagram in which a collision model and a shared node model are superimposed and displayed.

FIG. 6 is an explanatory diagram showing joining between plate elements.

FIG. 7 is an explanatory diagram of a case where data is not joined.

[Explanation of symbols]

10 collision model data, 12 shared node conversion program, 14 shared node data, 16 display device, 20, new node, 21,25 shared node, 22,24 beam element, 1
00 workstation.

Claims (2)

[Claims] 1. Model generation means for generating model data, which is created based on a specific data format, and which is configured by joining plate elements and nodes having shape parameters to each other, and is located at a joining portion of the model data. Among the nodes, there is a shared node generation unit that sets a predetermined flag for a node having two or more different shape parameters, and a display unit that displays the model data and the flag in a superimposed manner. A model joining state recognition device characterized by displaying a flag at a shared node. 2. The model connection state recognition device according to claim 1, wherein the flag is a beam element having the shared node as an end point,
A model joint state recognition device characterized in that the beam length is changed according to the number of different shape parameters.