JPH0323545Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration mode animation display device, and in particular, a vibration mode suitable for displaying images of vibration modes of multiple measurement parts of a workpiece in real time. The present invention relates to an animation display device.

[Conventional technology]

Conventionally, as a device to observe the vibration state of each measurement part of an object to be measured such as a car, the vibration of each measurement part is converted into periodic data that changes over time, that is, time axis data, and based on this time axis data. A vibration mode animation display device that displays an image of the vibration mode of each measurement site was used. This device can display an image of the vibration mode of each measurement site as an overall vibration state.

By the way, in most vehicles such as automobiles, there are so-called forced vibrations in which various vibrations of the engine act as forced forces and cause the vehicle body to vibrate. This forcing force includes many frequency components, and it is of great significance to find out which frequency component of the forcing force has the greatest influence on the overall vibration displayed in the image.

[Problem that the invention attempts to solve]

However, with conventional devices, the vibration mode of each measurement site is displayed as an image of overall vibration, so it is difficult to display an animation of the steady vibration of an automobile body, etc. caused by an arbitrary frequency component of the forcing force. I couldn't do it.

The present invention has been developed in view of the above-mentioned conventional problems, and its purpose is to display an animation in real time of the vibration mode of any frequency component among the vibration frequencies of multiple measurement parts of the object to be measured. An object of the present invention is to provide a vibration mode animation display device.

[Means for solving problems]

In order to achieve the above object, the present invention includes a group of vibration sensors that sequentially convert vibrations at a plurality of measurement parts of an object to be measured into electrical signals, and a system that captures and inputs the electrical signals of each vibration sensor at predetermined time intervals. A frequency analyzer that analyzes the frequency of each signal, selectively switches among each input signal to extract only signals with arbitrary frequency components, and stores the level of the extracted signal in memory as time axis data, and a frequency analyzer. A vibration mode animation display that includes a display unit that sequentially displays images of multiple input signals simultaneously in real time by matching the vibration mode of each measurement site to each measurement site based on the time axis data group stored in the memory of the This is the configuration of the device.

[Effect]

Vibrations at multiple measurement points of the object to be measured are detected by a group of vibration sensors, and a frequency analyzer captures the electrical signals from each vibration sensor at predetermined time intervals, and analyzes the frequency of each input signal. Only signals of specific frequency components are extracted from among them, and the level of each extracted signal is stored in memory as time axis data. Then, based on the time-axis data group stored in the memory of the frequency analyzer, the vibration mode of each measurement site is made to correspond to the position of each measurement site on the display section, and images of a plurality of input signals are sequentially displayed simultaneously in real time.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a preferred embodiment of the present invention. In FIG. 1, a plurality of measurement sites _{a 1 , a 2 .} is installed.
The output signals of each of the vibration sensors 12a ₁ to 12a _i are supplied to a frequency analyzer 14. The frequency analyzer 14 takes in electrical signals from each of the vibration sensors 12a ₁ to 12a _i at predetermined time intervals, analyzes the frequency of these input signals based on the forcing force F for imparting vibration to the vehicle body 10, and calculates the frequency of each input signal. A data converter 1 that extracts only signals of specific frequency components from among the signals and converts the level of each extracted signal into time-axis data.
6. It is composed of a memory 18 that stores time axis data. In the frequency analyzer 14, when the signal shown in a of FIG. 2 is supplied from the vibration sensor 12a _i , the predetermined time t ₁ , t ₂ , t ₃ ,
The signal from the vibration sensor 12a ₁ is captured every time t ₄ ...t _o , and each of these input signals is frequency-analyzed as shown in b in FIG. 2 (at this time, the phase of the input signal is also captured). , only a specific frequency component, for example, a secondary component signal, is extracted from this input signal, and the level of the extracted signal is stored in the memory 18 as time axis data as shown in c of FIG. The time axis data group in the memory 18 is sequentially supplied to the display section 20 and converted into image data. Then, on the display screen of the display unit 20, the vibration mode of each measurement site based on the time axis data group (including their phase data) is displayed as an image in real time. When displaying images of the vibration modes of measurement sites _{a 1 to} a _i at times t _{1 ,} t ₂ , and t ₃ in real time, as shown in FIG. In addition to displaying the image of the vibration mode at time t ₁ in real time, the vibration mode at time t 1 is then erased from the display screen, and the vibration mode of each measurement site based on the time axis data at times t ₂ and t ₃ is displayed in real time. Display image. Thereafter, the images of the time axis data from the time before the previous time are sequentially erased in the same manner, and the vibration mode of each measurement site based on the previous time axis data and the current time axis data is displayed as an image in real time. Then, at time _to , the vibration mode animation display is stopped. In this way, in this embodiment, since it is possible to display an image in real time of how an arbitrary frequency component in the forcing force F affects each measurement part of the vehicle body 10, it is possible to display an image in real time. It is possible to confirm with an image how an arbitrary frequency component of oscillates at each measurement site of the vehicle body 10. On the other hand, by switching the frequency components extracted by the frequency analyzer, images for arbitrary frequency components can be switched and displayed very easily.

[Effect of idea]

As explained above, according to the present invention, it is possible to display in real time the vibration mode of any frequency component among the vibration frequencies at each measurement part of the object to be measured. An excellent effect can be obtained in that the vibration state of any frequency component of the vibration frequency can be easily switched and confirmed in an image.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a diagram for explaining the operation of the device shown in FIG. 1, and FIG. 3 is a diagram showing an example of displaying an image of the device shown in FIG. 10... Vehicle body, 12a ₁ , 12a ₂ ... 12a _i ...
Vibration sensor, 14... Frequency analyzer, 16... Data converter, 18... Memory, 20... Display unit.

Claims (1)

[Scope of utility model registration request] A group of vibration sensors that sequentially convert vibrations at multiple parts of the object to be measured into electrical signals, and a system that captures electrical signals from each vibration sensor at predetermined time intervals and performs frequency analysis on each of these input signals. a frequency analyzer that selectively switches to extract only signals of arbitrary frequency components and stores each extracted signal level in a memory as time-axis data;
A display section that displays images of multiple input signals sequentially and simultaneously in real time by associating the vibration mode of each measurement site with the measurement site based on the time-axis data group stored in the memory of the frequency analyzer. Vibration mode animation display device.