JP2004295433A - Analytical result display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable accurate evaluation in a short time by facilitating specification of the location of a place to be noted on a displayed three-dimensional object. <P>SOLUTION: A feature display process P1 displays the shape of a three-dimensional object, and color-codes every element according to result value. After an object division process P2 divides the space including the object into a plurality of segmented groups, an extraction process P3 extracts a maximum value of result values in every group, and a group specification process P5 specifies the group with the largest maximum value of the groups. A highlighting process P6 superposes the interfaces of the groups and the object, and foregrounds the group with the maximum value. When any group is selected, a selected group display process P7 displays the shape of the selected group of the object. The same processes P1 to P7 are then executed on the selected group. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a program for displaying an analysis result of a CAE (Computer Aided Engineering) system.
[0002]
[Prior art]
When a specific object is designed using a CAD (Computer Aided Design) system, analysis such as stress analysis, mechanism analysis, and thermo-fluid analysis is performed to evaluate the performance and quality of the object. For example, in order to verify the strength and durability of an object, a stress analysis is performed, a portion having a large stress is represented by a red-based color, and a portion having a small stress is represented by a blue-based color. In the finite element method, an analysis mesh is generated on an object, a stress value is calculated for each node, and elements are color-coded according to the calculation result value and displayed on a screen.
[0003]
The user confirms the object displayed in different colors on the screen, rotates the coordinate axes to change the view, and searches for and evaluates a portion of interest, that is, a portion where the stress is greatest. Patent Literature 1 below discloses a CAD / CAE apparatus using a finite element method and a method of displaying an analysis result thereof.
[0004]
[Patent Document 1] Japanese Patent Application Laid-Open No. 11-66131
[Problems to be solved by the invention]
However, in the conventional system, there is a problem that skill is required to distinguish a notable portion from the displayed three-dimensional object, for example, a stress concentration portion in the case of stress analysis. That is, in order to narrow down a notable portion, it is necessary to use a method such as view adjustment, range adjustment, or manual enclosing, but such a method is difficult without experience and operation skills. Therefore, such a task is difficult for a beginner who has little experience and operation skills.
[0006]
When the evaluation is performed based on the whole display without being narrowed down, first, a singular point in the numerical calculation (a point where a high result value that should not be evaluated is obtained) appears and the evaluation becomes inappropriate. Second, since the number of data points is large, the amount of processing for displaying the analysis results in different colors is large, and it takes time to display or redisplay when rotating the coordinates of the displayed object. There's a problem.
[0007]
The present invention has been made in view of the above-described problems of the related art, and even a beginner of the CAE system can easily specify a notable part of a displayed three-dimensional object, and An object of the present invention is to provide an analysis result display program capable of performing accurate evaluation in a short time.
[0008]
[Means for Solving the Problems]
An analysis result display program according to the present invention has a configuration in which coordinates of a large number of data points set on a three-dimensional object and a result value of an analysis calculation are input, and the result value is displayed on a screen as a three-dimensional model. An object segmentation process for segmenting a space including a three-dimensional object into a plurality of groups, and extracting for each segmented group, extracting a maximum value of a result value at a plurality of data points included in each group as an intragroup maximum value. The process and the group identification process for comparing the maximum value in all the groups extracted in the extraction process and identifying the group in which the maximum value in the group is the maximum, the boundary surface and the three-dimensional object used for the group division The group specified by the group identification process is displayed as close to the screen as possible. Selecting a group after performing the highlighting process, adjusting the view so that the highlighting process is performed from the object classification process for the three-dimensional objects of the selected group. Is executed to sequentially narrow down and display a target portion of the three-dimensional object.
[0009]
According to the above-described program, the data of the analysis results can be automatically grouped to narrow down a portion having a high result value, and accurate evaluation can be performed in a short time. In this specification, a point that is located in a three-dimensional space and has numerical data information such as an analysis result, such as a node or an element of the finite element method, is referred to as a “data point”.
[0010]
In the group identification process, the group with the largest group maximum and the group with the smallest group are identified, and in the highlighting process, the group with the largest group maximum is on the front side of the screen, and the group with the smallest value is the group on the screen. The view may be adjusted and displayed so that it is on the back side on the screen and the center of gravity of these two groups overlaps on the screen.
[0011]
Also, the analysis result display program of the present invention may include a feature display process of giving a visual change to the three-dimensional object according to the result value for each data point and displaying the three-dimensional object so that the distribution of the result value can be visually understood. Is desirable. In this case, the feature display process is executed in parallel with the processes from the object classification process to the highlighting process. When the boundary surface and the 3D object are displayed by the highlighting process, the result value is added to the 3D object. What is necessary is just to give a visual change according to it.
[0012]
Further, a list display process for sorting the groups by the maximum value within the group and displaying the list on the screen can be included. In the list display process, a flag serving as a display / non-display switch may be set for each group, and in the feature display process, processing may be performed excluding the group in which the flag is not displayed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an analysis result display program according to the present invention will be described. Here, a case will be described as an example in which an analysis result of a three-dimensional object divided into a number of elements by mesh division by the finite element method is displayed. FIG. 1 is an explanatory diagram showing the structure and flow of an analysis result display program according to the embodiment.
[0014]
The program according to the embodiment is executed in an analysis result display control device (workstation) 1 as shown in FIG. 1, and displays a result value as a three-dimensional model on a display 2 at each stage. When a result display command is input to the analysis result display control device 1, the coordinates of a large number of data points set on the three-dimensional object to be analyzed and the result value of the analysis calculation (analysis result data) are input. Process is executed.
[0015]
First, the analysis result data is passed to the feature display process P1 and the object classification process P2. In the feature display process P1, when the analysis result data is input, a first object display window W1 is opened on the screen of the display 2 to display the shape of the mesh-divided three-dimensional object as shown in FIG. . In the feature display process P1, the three-dimensional object is displayed by giving a visual change according to the result value for each data point so that the distribution of the analysis result value can be visually understood. This process is the same as that included in a conventional analysis result display program, and is a process of displaying the shape of a mesh-divided three-dimensional object and color-coding each element according to the result value. For example, when displaying the result of the stress analysis, a portion having a large stress is represented by a red-based color, and a portion having a small stress is represented by a blue-based color. Since the display of the shape can be easily performed based on the coordinate values of the three-dimensional object, the display is performed immediately after the analysis result data is input. On the other hand, the color-coding process has a large processing amount and takes a long processing time, and is therefore executed in parallel in the background of another process.
[0016]
The object partitioning process P2 is a process of partitioning a space including a three-dimensional object into a plurality of groups. In this example, a cubic space that includes a three-dimensional object and whose three sides are parallel to the coordinate axes of the three-dimensional coordinates of x, y, and z is set, and the coordinates of the vertex (x _MIN , y _MIN , z _MIN ) and the coordinates of the vertex farthest from the origin (x _MAX , y _MAX , z _MAX ) are obtained, and thresholds x1, x2, y1 are set so as to divide each side from these coordinate values into three equal parts. y2, z1 and z2 are determined, and the space is equally divided into 27 groups of 3 × 3 × 3 by a boundary surface determined by these threshold values. Also, the center of gravity of each divided group is calculated.
[0017]
When the object segmentation process P2 is executed, the group number, the coordinates of the vertex closest to the origin in the group space, the coordinates of the vertex farthest from the origin, and the coordinates of the center of gravity are obtained for each group, and the first object on the display is obtained. In the display window W1, a boundary surface determined by the above-described threshold is displayed so as to be superimposed on the shape of the three-dimensional object.
[0018]
The data obtained in the object classification process P2 is input to the extraction process P3. The extraction process P3 compares, for each of the divided groups, the result values of all the data points included in each group, and extracts the maximum value as the maximum value in the group. In this example, 27 group maximum values are extracted.
[0019]
Subsequently, in the list display process P4, the data of all the groups are sorted by the maximum value in the group and displayed on the display as a list, and a flag serving as a display / non-display switch is set for each group. The list is displayed in a list display window WL on the screen as shown in FIG. This list includes the order of the groups “1, 2, 3,...”, Check boxes of flags indicated by “□”, group names “Grp01, Grp21, Grp18,...”, And the maximum value (MAX value) in the group. For a group that may be excluded from the evaluation target, check the check box of the flag. Then, since the other processes execute the processing except for the checked group, the processing can be lightened and the speed can be increased.
[0020]
The group identification process P5 compares the maximum values in all the groups extracted in the extraction process P3, or uses the list created in the list display process P4 to select the group (maximum) in which the maximum value in the group is maximum. Group) and a group (minimum group) having the smallest maximum value in the group.
[0021]
The highlighting process P6 superimposes the three-dimensional object on the boundary surface used for the group division, and views the maximum group specified by the group specifying process P5 so as to be displayed as close to the screen as possible. Is adjusted, and the largest group is displayed on the screen with emphasis on other groups. As shown in FIG. 3, the three-dimensional object and the boundary surface of the group division are displayed in the first object display window W1, and the maximum group is highlighted on the near side.
[0022]
When the view is adjusted, not only the maximum group is displayed on the front side, but also the minimum group may be adjusted on the rear side. At this time, the center of gravity of the largest group and the center of gravity of the smallest group may be adjusted so as to coincide at the center of the object display window. When the color-coding process of the feature display process P1 ends before the display by the highlighting process P6 ends, each element of the three-dimensional object shown in FIG. 3 is colored according to the result value, and the stress value on the three-dimensional object is changed. The distribution is displayed.
[0023]
The view of the object display window can be changed by a user operation. When the view is changed, the feature display process P1 is executed again. At this time, the group for which the flag is set to non-display is excluded from the color classification process. Thereby, unnecessary color classification processing can be omitted, and the processing amount of the characteristic display process P1 can be reduced.
[0024]
If a more detailed evaluation is required, the user can specify the area of the group of interest of the object displayed in the first object display window W1 or select the area in the list displayed in the list display window WL. By specifying the group name of the group of interest in, any one group can be selected. When a group located at the center that does not appear on the surface is selected from the object display window, a “center” button displayed at the upper right of the window is clicked.
[0025]
In general, a detailed evaluation is required in a portion having a high result value. Therefore, when the maximum group is highlighted in the near side by the highlighting process P6, even a beginner can perform a detailed evaluation without hesitation. The necessary groups can be narrowed down and selected.
[0026]
In the selected group display process P7, a second object display window W2 is newly opened on the first object display window W1 for displaying the entirety, and the shape of the selected group is displayed there. When selecting the largest group, the user can make a selection based on the display of the highlighting process P6 without waiting for the end of the process of the feature displaying process P1, so that the waiting time can be reduced. Work efficiency.
[0027]
When the selected group display process P7 is executed, only the shape of the selected group is displayed in the newly opened second object display window W2. Subsequently, the analysis result data of the selected group is input to the feature display process P1 and the object classification process P2, and the same processing as that described above for the entire object is performed on the selected group. That is, the feature display process P1 executes the coloring process for each element of the selected group in the background, and in parallel with this, the object sorting process P2 to the highlighting process P6 are executed.
[0028]
The object partitioning process P2 determines a threshold based on the spatial coordinates of the selected group, and re-partitions this space into 27 3 × 3 × 3 groups. In the second object display window W2 of the display, a boundary surface determined by the above-described threshold is displayed so as to overlap the shape of the three-dimensional object of the selected group.
[0029]
The extraction process P3 extracts the maximum value of the result value for each of the re-divided groups, and the list display process P4 sorts the data of the group by the maximum value in the extracted group, and sorts the data of the group into the entire list displayed earlier. to add. As shown in the list display window WL in FIG. 4, the list has a hierarchical tree structure, and data of the small groups Grp1508 and Grp0108 included in the selected group Grp08 is displayed below the selected group Grp08. Also for these small groups, the order of the groups, the check boxes of the flags, the group names, and the maximum values (MAX values) in the groups are displayed.
[0030]
In the group specifying process P5, a group (maximum group) in which the maximum value in the group is maximum and a group (minimum group) in which the maximum value in the group is minimum are specified among the subgroups subdivided. In the highlighting process P6, the boundary surface used for group division and the three-dimensional object are superimposed, and a view is made so that the largest group specified by the group specifying process P5 is displayed as close to the screen as possible. Is adjusted, and the largest group is displayed on the screen with emphasis on other groups. As shown in FIG. 4, the three-dimensional objects of the selected group are displayed in the second object display window W2, and the maximum group is highlighted on the near side.
[0031]
When the process of the feature display process P1 ends before the display by the highlighting process P6 ends, each element of the three-dimensional object of the selected group displayed in the second object display window W2 is colored according to the result value. The result value distribution on the object is displayed. Since it is sufficient to display only the selected group, the processing amount of the color classification processing of the feature display process P1 is also reduced. This display may be confirmed and evaluated, or if necessary, a group that has been subdivided may be used as a model space, and a group to be further evaluated may be selected from the model space and narrowed down for display. By repeating such processing, the portion to be evaluated can be efficiently narrowed down, and the analysis result can be accurately evaluated in a short time.
[0032]
The first object display window W1 for displaying the entire three-dimensional object and the second object display window W2 for displaying the selected group have independent views so that the maximum group is displayed in front. As a result, the view directions are different between the two windows. Since the views of each window can be adjusted independently, the directions of the views can be aligned while looking at the coordinate axes. However, the view directions of the window displayed in front (the second object display window W2 in FIG. 4) , The view direction of the window displayed in the back (the first object display window W1 in FIG. 4) may be automatically aligned.
[0033]
【The invention's effect】
As described above, according to the present invention, when displaying an analyzed three-dimensional object, a point of interest can be clearly shown to the user, and furthermore, the number of steps for narrowing down by continuous automatic grouping is reduced. Therefore, even a beginner of the CAE system can appropriately evaluate the analysis result in a short time. In addition, since only a part of the objects is displayed in groups after filtering, the display data is light and the operation response is good, and it is accurate without being affected by the singularity in numerical calculation which is a problem in the whole display. Evaluation is possible. Furthermore, since a region having a high result value can be found regardless of the entire result display processing, and the area can be narrowed down without waiting for the entire display, even a skilled worker can further improve the work efficiency.
[Brief description of the drawings]
FIG. 1 is a functional block diagram schematically showing an analysis result display program according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a display example on a display by the program in FIG. 1, showing a mesh-divided three-dimensional object.
FIG. 3 is an explanatory view showing a display example on a display by the program of FIG. 1, showing a first object display window and a list display window.
FIG. 4 is an explanatory diagram showing another display example on the display by the program of FIG. 1, showing first and second object display windows and a list display window.
[Explanation of symbols]
P1 Feature display process P2 Object classification process P3 Extraction process P4 List display process P5 Group identification process P6 Highlight display process P7 Selected group display process 1 Analysis result display control device 2 Display W1 First object display window W2 Second object display window WL list display window

Claims (5)

In an analysis result display program for inputting coordinates of a large number of data points set on a three-dimensional object and a result value of the analysis calculation, and displaying the result value on a screen as a three-dimensional model,
An object division process for dividing the space including the three-dimensional object into a plurality of groups;
An extraction process of extracting a maximum value of the result values at a plurality of data points included in each group as a maximum value in the group for each of the divided groups;
Comparing the maximum value in all the groups extracted in the extraction process, a group identification process to identify the group in which the maximum value in the group is maximum,
The boundary surface used for dividing the group and the three-dimensional object are overlapped, and the view is adjusted and displayed so that the group specified by the group specifying process is displayed as close to the screen as possible. Highlighting process, and if any group is selected after the execution of the highlighting process, by executing the highlighting process from the object classification process on the three-dimensional objects of the selected group, the An analysis result display program characterized by narrowing down and displaying an attention portion of a three-dimensional object. In the group identification process, the group in which the maximum value in the group is the maximum and the group in which the maximum value is the minimum are identified. 2. The analysis result display according to claim 1, wherein the view is adjusted so that a group to be located on the back side on the screen and the center of gravity of these two groups overlap on the screen. program. A feature display process for giving a visual change to the three-dimensional object in accordance with the result value for each data point and displaying the three-dimensional object so that the distribution of the result value can be visually understood; The process is executed in parallel with the process from the process up to the highlighting process, and when the boundary surface and the three-dimensional object are displayed by the highlighting process, a visual value corresponding to a result value is displayed on the three-dimensional object. The analysis result display program according to claim 1, wherein a change is given. The analysis result display program according to any one of claims 1 to 3, further comprising a list display process of sorting the groups by the maximum value within the group and displaying the list on a screen as a list. In the list display process, a flag serving as a display / non-display switch is set for each group, and in the feature display process, processing is performed excluding a group in which the flag is not displayed. An analysis result display program according to claim 4.

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