JPH01274278A - Method for processing display of vibration mode drawing - Google Patents

Abstract

PURPOSE:To observe a micro deformed state by graphic displaying the vibrating state of a structure in a vibration mode drawing by using expanded displacement. CONSTITUTION:The two-dimensional plan projection drawing data of the structure is generated at processing steps (20-22) by inputting structure definition data, and its size is decided. Next, at processing steps (23-26), a mode parameter is inputted and the displacement of each point of the structure is found by calculating, and the maximum value of the displacement is detected, and magnification is decided based on the size of the structure projection drawing and the maximum value of the displacement. Also, at a processing step 27, displacement quantity data at the point of the maximum value of the displacement is held as data to display as a bar graph, and also, corresponding data in scale display is generated. At a processing step 28, an indicator is displayed, and at a processing step 29, the magnification is multiplied by the displacement to be displayed, and at a processing step 30, the vibration mode drawing of the expanded displacement is displayed. At processing steps (28-30), display by the displacement at each phase are performed sequentially.

Description

[Detailed Description of the Invention] [Summary] Regarding the process of displaying a vibration mode diagram based on the result of modal analysis of a structure, it is possible to enlarge the displacement due to vibration of the structure in the vibration mode diagram to make it easier to see, and to easily calculate the actual amplitude. The purpose of this method is to provide a vibration mode diagram display processing method that adds a display that can be identified to the structure, and uses data that defines a structure and data that indicates the mode parameters of the structure as input, and displays the vibration mode diagram of the structure in a predetermined manner. When displaying the amplitude of the magnification on the display device, the amplitude of the point of maximum amplitude in the structure is displayed as a bar graph.
The bar graph is displayed near the vibration mode diagram together with the graph scale of the bar graph, and the display of the bar graph is expanded and contracted in synchronization with the vibration mode diagram.

[Industrial application field]

The present invention relates to processing for displaying a vibration mode diagram based on the results of modal analysis of a structure.

In modal analysis of a structure, the required structure is displayed as a wire frame model, and the results are intuitively displayed as an animation that vibrates each point on the diagram according to the resonance frequency and amplitude of the analysis result.

[Conventional technology]

FIG. 3 is a block diagram showing an example of the configuration of a mode analysis system. The figure shows a system for displaying vibration mode diagrams,
The mode display unit 1 receives the structure definition data 2 and the mode parameter data 3 as input, and displays a vibration mode diagram of the defined structure on the display device 4.

The structure definition data 2 is three-dimensional coordinate data consisting of points constituting the required structure and lines connecting the points, and the mode display unit 1 creates a wireframe model of the structure based on this data. A vibration mode diagram is displayed by constructing a schematic diagram and transforming it using vibration information.

The mode parameter data 3 is composed of one or more resonant frequencies for the structure, so-called mode save information consisting of amplitude and phase information of each point at each resonant frequency, and damping information indicating vibration damping characteristics,
It is obtained as a result of modal analysis.

As is well known, for example, vibrations generated by hitting each point of a structure with a hammer are sampled through an appropriate sensor and an analog-to-digital converter, and the measured data is subjected to modal analysis processing.

Using these data as input, the mode display unit 1 generates and displays a vibration mode diagram as illustrated in FIG. 4, which shows the vibration state of one mode at a specific resonance frequency, for example, according to a designation from the designation input unit 5. do. FIG. 4 is an example in which the iron plate 9 is defined as a structure, with the broken line showing a stationary state and the solid line showing an example of a state at one point in time where it is deformed by vibration.

In the case of multi-mode display, similar diagrams for a plurality of different modes (resonant frequencies) corresponding to a designated number, for example, are displayed on one screen so that they can be compared.

For this display, for example, as shown in the processing flow in FIG. Generate coordinates projected onto a two-dimensional plane.

In processing step 12, the size of the structure to be displayed is detected based on the coordinate values. To measure the size of a structure, for example, the maximum length in the X-axis direction of the projected image is taken as the maximum length in the Y-axis direction is b.
In this case, the diagonal length determined by FνW is used.

Next, in processing step 13, mode parameter data is input, and in processing step 14, the displacement of each point of the structure is calculated from these parameters for a plurality of predetermined phases (i.e., times). In addition, in this calculation, the displacement of each point of each phase is determined for each required mode according to the designation input from the designation input section 5.

In processing step 15, the maximum value of the determined displacement amounts is detected for each mode, and in processing step 16, the magnification of each mode is calculated based on the maximum value.

This magnification is a magnification that is multiplied by the amount of displacement when displaying in order to make it easier to see the deformation of the structure, and is a value determined empirically as a function of the previously determined size L and the maximum value of the displacement. For example, the magnification is determined so that the maximum displacement of the display is L1710.

In processing step 17, a value obtained by multiplying the displacement amount of each point in one phase by a magnification is calculated on the two-dimensional projected coordinates of the structure, and in processing step 18, a deformed figure of the structure due to the enlarged displacement is generated. indicate.

In processing step 19, the displacement in each phase identified and determined is displayed in sequence at appropriate time intervals in processing step 17.18, thereby completing the series of vibration mode diagram display.

(Problem to be Solved by the Invention) As mentioned above, when displaying a vibration mode diagram, in order to make it easier to observe the vibration state of a structure, the figure is displayed using a displacement that has been magnified by an appropriate magnification. This makes it possible to observe even minute deformations.

However, as a result, it is difficult to grasp the actual displacement relative to the size of the structure, and in the case of multi-mode display, it is also difficult to compare the magnitude of displacement between modes.

The present invention provides a vibration mode diagram display processing method that solves the above problems by enlarging the displacement due to vibration of a structure in the vibration mode diagram to make it easier to see, and adding a display that makes it easy to identify the actual amplitude. purpose.

[Means to solve the problem]

FIG. 1 is a process flowchart showing the configuration of the present invention.

The figure shows the flow of display processing of a vibration mode diagram in the mode analysis system, and 20 to 31 are processing steps.

[For production]

The mode display section of the mode analysis system manually inputs the structure definition data in processing steps 20 to 22 of FIG. 1 to generate two-dimensional plane projection data of the structure and determine its size.

Next, in processing steps 23 to 26, the mode parameter data is input, the displacement of each point of the structure is calculated and determined, its maximum value is detected, and based on the size of the structure projection diagram and the maximum value of displacement. to determine the magnification.

In addition, in processing step 27, in order to display an indicator consisting of a bar graph and a scale, the displacement amount data at the point of the maximum displacement value is held as data for displaying the bar graph, and data for corresponding scale display is generated. .

In processing step 28, an indicator is displayed, and in processing step 29, the displacement to be displayed is multiplied by a magnification, and processing step 3
The vibration mode diagram of the displacement enlarged at 0 is displayed, identified at processing step 31, and displayed by the determined displacement at each phase in sequence at processing steps 28 to 30.

With the processing method described above, the state of deformation of the structure can be easily observed as in the conventional method, and the actual amount of displacement can be easily recognized by displaying the indicator.

〔Example〕

In the mode analysis system shown in Fig. 3, the mode display section 1
inputs the structure definition data 2 and mode parameter data 3 similar to the conventional one, and executes the vibration mode diagram display process according to the present invention as follows.

That is, inputting structure definition data in processing step 20,
In processing step 21, coordinates projected onto a two-dimensional plane are generated for display.

As the size L of the structure to be displayed using the coordinate values in processing step 22, for example, the length of the diagonal line is determined as in the conventional method.

Next, in processing step 23, mode parameter data is input, and in processing step 24, the displacement of each point of the structure is calculated from these parameters for a plurality of predetermined phases. In this calculation, a set of displacements is determined for each of one or more modes according to the designation input from the designation input section 5.

In processing step 25, the maximum value of the determined displacement amounts is detected for each mode, and in processing step 26, a magnification is determined from the size L of the structure and the maximum displacement value, as in the conventional case.

In processing step 27, in order to display an indicator consisting of a bar graph and a scale, the displacement amount data at the point of the maximum displacement value is held as data for displaying the bar graph, and data for displaying the corresponding scale is held. generate.

Using the data prepared as described above, vibration mode diagrams for each phase are displayed, for example, as shown in Figure 2 (al.
As shown in a display example in the case of mode display, indicators (bar graph 40 and scale 41 in the figure) are first displayed in processing step 28. As shown in the illustrated example, the scale 41 has appropriate graduations extending in the positive and negative directions with numbers indicating length added thereto.

In processing step 29, the displacement to be displayed is multiplied by a magnification factor, and in processing step 30, a vibration mode diagram of the enlarged displacement (
42) in the figure is displayed in the same way as before.

The displacements in each phase identified in processing step 31 and determined in processing step 24 are displayed at appropriate time intervals in processing steps 28 to 30.

Therefore, at the same time, the bar graph of the indicator is displayed expanding and contracting up and down centering on the O scale of the scale.

In the case of multi-mode display, data of a plurality of modes are displayed in processing steps 28 to 30, for example, as shown in FIG.
) shows an example of a four-mode display, indicators are displayed near the vibration mode diagram for each mode.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when displaying a vibration mode diagram in a mode analysis system, it is possible to enlarge and observe the deformation state of a structure in an easy-to-see manner as before, and to display the actual amount of displacement using an indicator. This makes the system easy to use (
This has a significant industrial effect.

[Brief explanation of the drawing]

Fig. 1 is a process flowchart showing the configuration of the present invention, Fig. 2 is a detailed explanatory diagram of the present invention, Fig. 3 is a block diagram of an example configuration of a mode analysis system, and Fig. 4
The figure is an explanatory diagram of vibration mode diagram display, and FIG. 5 is a flowchart of conventional processing. In the figure, 1 is a mode display section, 2 is structure definition data, 3 is mode parameter data, 4 is a display device, 5 is a specification input section, 10 to 19
．． 20 to 31 are processing steps, 40 is a bar graph,
41 is a scale, and 42 is a vibration mode diagram.

Claims (1)

[Claims] When data defining a structure and data indicating mode parameters of the structure are input, a vibration mode diagram of the structure is displayed on a display device with an amplitude of a predetermined magnification, The amplitude at the point of maximum amplitude in the structure is displayed as a bar graph in the vicinity of the vibration mode diagram together with the graph scale of the bar graph, and the display of the bar graph is expanded and contracted in synchronization with the vibration mode diagram (steps 20 to 31). ) A vibration mode diagram display processing method characterized by: