JP7590949B2 - Vibration detector and vibration analysis system - Google Patents

Description

The present invention relates to technology for detecting vibrations.

A known technology for detecting vibrations is a system that includes multiple vibration measuring devices fixed to the object to be detected, which is the object of vibration detection, and a management device (for example, Patent Document 1). In this system, the vibration measuring devices detect the acceleration of the object to be detected using acceleration sensors, and transmit the acceleration data to the management device via wireless communication. The management device then analyzes the received acceleration data to detect abnormal vibrations, etc., in the object to be detected.

JP 2021-76619 A

According to the above-mentioned technology, in order for an operator to recognize the vibration state of the detected object, a management device is required in addition to the vibration measuring device fixed to the detected object, which makes the handling cumbersome and cost excessive for applications that simply check or monitor the vibration state of the detected object.
The present invention aims to detect vibration and present the vibration state with a relatively simple configuration.

To achieve the above object, the present invention provides a vibration detector that is fixed to a detection object, which is an object for detecting the state of vibration, and that includes an acceleration sensor, a computing unit, and a light-emitting device with a variable emission color. The light emitted by the light-emitting device is visible from outside the vibration detector, and the computing unit detects the vibration state of the detection object from the output of the acceleration sensor, and changes the emission color of the light-emitting device according to the detected vibration state.

The vibration detector may include a frequency filter having variable frequency characteristics, and the computing unit may detect the vibration state of the detection object from the output of the acceleration sensor that has passed through the frequency filter.
The vibration detector may further include a time constant changing means for changing a time constant for detecting the vibration state of the computing unit.
In addition, the computing unit of the vibration detector may detect the acceleration of the object to be detected as the vibration state, and change the light emitting color of the light emitting device so that at least one of the hue and luminance of the light emitting color of the light emitting device gradually changes in accordance with the gradual change in the detected acceleration.

Alternatively, the computing unit of the vibration detector may detect the vibration acceleration level of the object to be detected as the vibration state, and change the light emission color of the light-emitting device so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in accordance with the gradual change in the detected vibration acceleration level.

Alternatively, the computing unit of the vibration detector may detect the vibration level of the object to be detected as the vibration state, and change the light emission color of the light-emitting device so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in accordance with the gradual change in the detected vibration level.

The vibration detector may further comprise a range changing means for changing the correspondence between a range in which the light emission color of the light emitting device is changed by the computing unit and a range in which the vibration state is changed.
The vibration detector may further comprise an external output means for outputting a signal representing the vibration state of the detection object detected by the computing unit to the outside.
In addition, the computing unit of the vibration detector may cause the light-emitting device to emit light in a first light color when the detected vibration state is within a predetermined normal range, and cause the light-emitting device to emit light in a second light color different from the first light color when the detected vibration state is not within the normal range.

The vibration detector may be provided with a first operation mode and a second operation mode as switchable operation modes, and the computing unit may change the light emission color of the light-emitting device in the first operation mode so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in accordance with the gradual change in the detected vibration state, and may cause the light-emitting device to emit light in the first light emission color when the detected vibration state is within a predetermined normal range in the second operation mode, and cause the light-emitting device to emit light in a second light emission color different from the first light emission color when the detected vibration state is not within the normal range.

With these vibration detectors, the vibration state of the detected object, such as the acceleration, vibration acceleration level, vibration level, and whether the vibration is within or outside the normal range, can be immediately recognized from the light color emitted by the light-emitting device, simply by looking at the vibration detector fixed to the detected object. Therefore, vibration detection and the display of the vibration state can be performed with a simple configuration that does not require any device other than the vibration detector. Furthermore, even if the acceleration changes quickly, the vibration state can be recognized from the light color by setting the time constant for vibration state detection so that the speed of change in the light color of the light-emitting device is at a level that allows the change in the light color to be easily recognized by visual inspection.

The present invention also provides a vibration analysis system including a vibration detector.
The vibration analysis system includes one or more of the vibration detectors fixed to a detection target, a camera that captures images of the one or more vibration detectors so that an image of light emitted from a light emitting device of each of the vibration detectors is included in the captured image, and a video recorder that records the captured image captured by the camera.
and an analysis device that analyzes the vibration of the detection object based on the position of each vibration detector and the light emission color of the light emitting device of each vibration detector, which are shown in the captured image recorded on the video recorder.

Alternatively, a vibration analysis system includes one or more of the vibration detectors fixed to a detection object,
The system includes a camera that photographs the one or more vibration detectors so that an image of the light emitted by the light-emitting device of each vibration detector is included in the photographed image, and a video recorder/player that records the photographed image captured by the camera and plays the recorded photographed image in slow motion.

Alternatively, the vibration detector is equipped with the external output means, and the vibration analysis system is equipped with one or more of the vibration detectors fixed to the object to be detected, and an analysis device that analyzes the vibration of the object to be detected using the vibration state represented by the signal output by the external output means of the vibration detector.

These vibration analysis systems use vibration detectors to perform various analyses of the vibration of the object being detected while it is in operation.

The present invention makes it possible to detect vibrations and display the vibration status with a relatively simple configuration.

1 is a block diagram showing a configuration of a vibration detector according to an embodiment of the present invention. 1A and 1B are diagrams illustrating an appearance and a usage example of a vibration detector according to an embodiment of the present invention. 11A to 11C are diagrams illustrating a vibration state presenting operation of the vibration detector according to the embodiment of the present invention. 1 is a block diagram showing a configuration of a vibration analysis system according to an embodiment of the present invention. 1 is a diagram illustrating an application example of a vibration analysis system according to an embodiment of the present invention. FIG. 11 is a diagram showing another configuration example of a vibration analysis system according to an embodiment of the present invention. 11A and 11B are diagrams illustrating another example of the configuration of a vibration detector according to an embodiment of the present invention. 11A and 11B are diagrams illustrating another example of the configuration of a vibration detector according to an embodiment of the present invention.

An embodiment of the present invention will be described.
FIG. 1 shows the configuration of a vibration detector according to this embodiment.
The vibration detector 1 is a device that is fixed to a detection object, which is the object for detecting the state of vibration, and as shown in the figure, it is equipped with an acceleration sensor 11, a calculator 12, a function setting unit 13, an external interface (external I/F) 14, an LED driver 15, a full-color LED 16, and an output interface (output I/F) 17 that outputs a signal representing the detection value of the vibration detector 1 to the outside.

The vibration detector 1 is powered by a built-in battery (not shown). However, it may be powered by an external power supply via a wire or the like. The external power supply may be performed using a signal output line of the output interface 17.
The full-color LED 16 has three LEDs that emit light of R, G, and B, and the emitted color (the color visible to humans) can be changed by changing the driving sequence of each LED performed by the LED driver 15.
Next, the calculator 12 includes a variable frequency filter 121 , a vibration acceleration level calculator 122 , a vibration level calculator 123 , a comparator 124 , and a lighting control unit 125 .
Each part of the calculator 12, or each part of the calculator 12 and the function setting part 13 may be implemented as functions of the same processor. The LED driver 15 may also be built into this processor.
The acceleration sensor 11 detects acceleration, and outputs an acceleration signal representing the detected acceleration to a variable frequency filter 121 , a vibration acceleration level calculation section 122 , a vibration level calculation section 123 , a comparator 124 , and a lighting control section 125 .
The variable frequency filter 121 is a filter whose frequency characteristics are variable, and can selectively function as an LPF (low pass filter), a BPF (band pass filter), or an HPF (high pass filter).
The vibration acceleration level calculation unit 122 selectively selects either the acceleration signal output by the acceleration sensor 11 or the output signal of the variable frequency filter 121 as a signal to be used for calculating the vibration acceleration level, calculates an effective value of the signal to be used for calculating the vibration acceleration level, and outputs a vibration acceleration level, expressed in decibels, to the comparator 124 and the lighting control unit 125.

The vibration level calculation unit 123 selectively selects either the acceleration signal output by the acceleration sensor 11 or the output signal of the variable frequency filter 121 as a signal to be subjected to vibration level calculation, calculates the effective value of the signal obtained by correcting the human vibration sensation for the signal to be subjected to vibration level calculation, and outputs the calculated effective value as a vibration level expressed in decibels to the comparator 124 and the lighting control unit 125.

The comparator 124 selectively monitors the monitored signal from among the acceleration signal output by the acceleration sensor 11, the output signal of the variable frequency filter 121, the vibration acceleration level output by the vibration acceleration level calculation unit 122, and the vibration level output by the vibration level calculation unit 123, and outputs a normality signal indicating whether the monitored signal is within or outside the normal range to the lighting control unit 125.

The output interface 17 uses as a detection signal any one of the acceleration signal output by the acceleration sensor 11, the output signal of the variable frequency filter 121, the vibration acceleration level output by the vibration acceleration level calculation unit 122, the vibration level output by the vibration level calculation unit 123, and the normality/absence signal output by the comparator 124, and outputs to the outside a signal representing the value of the detection signal.

The external interface 14 is a wired or wireless communication interface, or an input device that accepts operations by an operator. The function setting unit 13 receives instructions from the operator via the external interface 14 and sets each unit in accordance with the received instructions.
The settings made by the function setting unit 13 include setting the frequency characteristics of the variable frequency filter 121, setting the signal to be used as the target signal for vibration acceleration level calculation in the vibration acceleration level calculation unit 122, setting the signal to be used as the target signal for vibration level calculation in the vibration level calculation unit 123, setting in the lighting control unit 125 whether the acceleration signal output by the acceleration sensor 11 or the output signal of the variable frequency filter 121 is to be used as the target signal for acceleration presentation, and setting the signal to be output as the detection signal in the output interface 17.

The settings made by the function setting unit 13 include setting the signal to be monitored by the comparator 124, and setting the conditions for determining whether the monitored signal is within the normal range or outside the normal range by the comparator 124. The conditions for determining whether the monitored signal is within the normal range or outside the normal range can be, for example, a condition for determining that the monitored signal is within the normal range when it does not exceed a predetermined threshold and outside the normal range when it exceeds the threshold, or a condition for determining that the monitored signal is outside the normal range when it continues to exceed a predetermined threshold for more than a predetermined time and within the normal range in other cases.

The settings made by the function setting unit 13 include the setting of a presentation mode, a light emission color control mode, and a presentation target range for the lighting control unit 125. The presentation modes include an acceleration presentation mode, a vibration acceleration level presentation mode, a vibration level presentation mode, a comparator mode, etc. The light emission color control modes include a hue control mode and a brightness control mode.

The lighting control unit 125 can control the hue and brightness of the light emitted by the full-color LED 16 via the LED driver 15. When the acceleration presentation mode is set, the lighting control unit 125 changes the light emitted by the full-color LED 16 according to the magnitude of the signal set as the acceleration presentation target signal. When the vibration acceleration level presentation mode is set, the lighting control unit 125 changes the light emitted by the full-color LED 16 according to the magnitude of the vibration acceleration level output by the vibration acceleration level calculation unit 122. When the vibration level presentation mode is set, the lighting control unit 125 changes the light emitted by the full-color LED 16 according to the magnitude of the vibration level output by the vibration level calculation unit 123. When the comparator mode is set, the lighting control unit 125 switches the light emitted by the full-color LED 16 depending on whether the normality signal output by the comparator 124 is within the normal range or outside the normal range.

FIG. 2a shows an example of the appearance of the vibration detector 1.
The vibration detector 1 may have any shape depending on the application, but should have a shape that allows the light emitted from the full-color LED 16 to be visible from the outside. In the example of Fig. 2a, a light guide 160 with an exposed upper end is provided on the upper surface of the vibration detector 1 so that the light emitted from the full-color LED 16 can be visible from the outside, and the light is guided by the light guide 160 to radiate the emitted light from the full-color LED 16 to the outside.

The vibration detector 1 is fixed to the object to be detected in such a manner that the light emitted by the full-color LED 16 can be seen from the outside. Also, as in the example of FIG. 2b1 where the object to be detected 9 is a machine tool, only one vibration detector 1 can be fixed to the object to be detected 9, or as in the example of FIG. 2b2 where the object to be detected 9 is an automobile, multiple vibration detectors 1 can be fixed to the object to be detected 9 at the same time.

FIG. 3 shows an example of the control of the emission color of the full-color LED 16 by the lighting control unit 125. In FIG.
3a1 shows an example of control when the acceleration presentation mode and the hue control mode are set. In this example, the light emission color of the full-color LED 16 is controlled so that when the acceleration represented by the acceleration presentation target signal (either the acceleration signal output by the acceleration sensor 11 or the output signal of the variable frequency filter 121) is 0, the light emission color is green, and as long as the acceleration is within the set presentation range, the hue of the light emission color gradually changes from green to yellow to red as the acceleration moves away from 0 in the positive direction, and the hue of the light emission color gradually changes from green to blue-green to blue as the acceleration moves away from 0 in the negative direction. In addition, the light emission color of the full-color LED 16 is controlled so that when the acceleration presentation target signal is below the lower limit of the presentation range, the light emission color is blue, when the acceleration presentation target signal is above the upper limit of the presentation range, the light emission color is red, and when the acceleration presentation target signal is between the lower limit and the upper limit, the light emission color is between blue and red. However, when the acceleration presentation mode is set, the presentation range is set so that the width of the positive range and the width of the negative range are equal.

Figure 3a2 shows an example of control when the vibration acceleration level presentation mode and the hue control mode are set. In this example, as long as the vibration acceleration level output by the vibration acceleration level calculation unit 122 is within the set presentation range, the light emission color of the full-color LED 16 is controlled so that the hue of the emitted light gradually changes from blue, blue-green, green, yellow, to red as the vibration acceleration level increases. Also, the light emission color of the full-color LED 16 is controlled to blue when the vibration acceleration level is below the lower limit of the presentation range, red when it is above the upper limit of the presentation range, and a hue between blue and red when it is between the lower and upper limits.

Figure 3a3 shows an example of control when the vibration level presentation mode and the hue control mode are set. In this example, as long as the vibration level output by the vibration level calculation unit 123 is within the set presentation range, the light emission color of the full-color LED 16 is controlled so that the hue of the emitted light gradually changes from blue, blue-green, green, yellow, to red as the vibration level increases. Also, the light emission color of the full-color LED 16 is controlled to blue when the vibration level is below the lower limit of the presentation range, red when the vibration level is above the upper limit of the presentation range, and a hue between blue and red when the vibration level is between the lower and upper limits.

Figure 3a4 shows an example of control when the comparator mode and the hue control mode are set. In this example, the full-color LED 16 emits green light when the normality signal output by the comparator 124 indicates that the signal is within the normal range, and emits red light when the normality signal is outside the normal range.

Figure 3b1 shows an example of control when the acceleration presentation mode and brightness control mode are set. In this example, when the acceleration represented by the acceleration presentation target signal (either the acceleration signal output by the acceleration sensor 11 or the output signal of the variable frequency filter 121) is 0, the brightness of the emitted color becomes a predetermined intermediate brightness, and as long as the acceleration is within the set presentation range, the brightness of the emitted color gradually increases from the intermediate brightness as the acceleration moves away from 0 in the positive direction, and the brightness of the emitted color gradually decreases from the intermediate brightness as the acceleration moves away from 0 in the negative direction. In addition, the emitted color of the full-color LED 16 is controlled to a predetermined minimum brightness when the acceleration presentation target signal is below the lower limit of the presentation range, to a predetermined maximum brightness when the acceleration presentation target signal is above the upper limit of the presentation range, and to a brightness between the minimum brightness and the maximum brightness when the acceleration presentation target signal is between the lower limit and the upper limit. However, when the acceleration presentation mode is set, the presentation range is set so that the width of the positive range and the width of the negative range are equal.

Figure 3b2 shows an example of control when the vibration acceleration level presentation mode and brightness control mode are set. In this example, as long as the vibration acceleration level output by the vibration acceleration level calculation unit 122 is within the set presentation range, the light emission color of the full-color LED 16 is controlled so that the brightness of the emitted color gradually increases as the vibration acceleration level increases. In addition, the light emission color of the full-color LED 16 is controlled to a predetermined minimum brightness when the vibration acceleration level is below the lower limit of the presentation range, to a predetermined maximum brightness when the vibration acceleration level is above the upper limit of the presentation range, and to a brightness between the minimum and maximum brightness when the vibration acceleration level is between the lower and upper limits.

Figure 3b3 shows an example of control when the vibration level presentation mode and brightness control mode are set. In this example, as long as the vibration level output by the vibration level calculation unit 123 is within the set presentation range, the emitted color of the full-color LED 16 is controlled so that the brightness of the emitted color gradually increases as the vibration level increases. In addition, the emitted color of the full-color LED 16 is controlled to a predetermined minimum brightness when the vibration level is below the lower limit of the presentation range, to a predetermined maximum brightness when the vibration level is above the upper limit of the presentation range, and to a brightness between the minimum and maximum brightness when the vibration level is between the lower and upper limits.

Figure 3b4 shows an example of control when the comparator mode and brightness control mode are set. In this example, the light emission color of the full-color LED 16 is controlled so that when the normality signal output by the comparator 124 indicates that the signal is within the normal range, the brightness of the light emission color of the full-color LED 16 is low (dark), and when the normality signal indicates that the signal is outside the normal range, the brightness of the light emission color of the full-color LED 16 is high (bright).

According to this embodiment, simply by looking at the vibration detector 1 fixed to the object to be detected 9, the acceleration, vibration acceleration level, vibration level, and whether the vibration is within or outside the normal range of the object to be detected 9 can be immediately recognized from the light emission color of the full-color LED 16. Therefore, vibration detection and vibration status presentation can be performed with a simple configuration that does not require any device other than the vibration detector 1. Furthermore, in the acceleration presentation mode, vibration acceleration level presentation mode, and vibration level presentation mode, the range of values represented by the light emission color of the full-color LED 16 and the sensitivity of the change in light emission color to a change in value can be appropriately set by the presentation range.

In addition, by combining the setting of the presentation mode, the setting of the signal to be presented for acceleration, the signal to be calculated for vibration acceleration level, the signal to be calculated for vibration level, and the signal to be monitored, and the setting of the frequency characteristics of the variable frequency filter 121, various vibration states of the object to be detected 9 can be detected and presented.

For example, by setting the output of the variable frequency filter 121 to an acceleration presentation target signal, a vibration acceleration level calculation target signal, or a vibration level calculation target signal, the vibration detector 1 can detect and present acceleration, vibration acceleration level, vibration level, and vibration within/outside the normal range for each desired band.

Furthermore, by arranging a plurality of vibration detectors 1, it is possible to identify the source of vibration based on the light emitted by the full-color LED 16 of each vibration detector 1.
Next, a vibration analysis system configured using the vibration detector 1 according to this embodiment will be described.
FIG. 4 shows the configuration of the vibration analysis system.
The vibration analysis system 2 comprises a plurality of vibration detectors 1, a camera 21, a video recorder/player 22 that stores/plays back/displays images captured by the camera 21, and an analysis device 23. As the camera 21, a high-speed camera that performs high-speed shooting or an event-based camera that detects changes in luminance of each pixel and outputs data on the luminance changes in combination with information on the position and time of the pixel can be used.

As in the example of FIG. 5a where the object to be detected 9 is an automobile, a plurality of vibration detectors 1 are arranged in a predetermined array on the object to be detected 9.
In this example, the acceleration sensor 11 detects acceleration in a direction perpendicular to the surface on which the light guide 160 of the vibration detector 1 is provided (the left-right direction of the automobile).
The camera 21 is positioned so as to be able to capture the light emitted by the full-color LED 16 of each vibration detector 1 .
The vibration analysis system 2 is a system for performing an actual operation analysis, and for example, when checking an actual operation vibration mode, an acceleration presentation mode is set in the lighting control unit 125. When checking each band, a frequency characteristic for extracting that band is set in the variable frequency filter 121, and the output signal of the variable frequency filter 121 is set as the acceleration presentation target signal in the lighting control unit 125. When checking each band is not performed, the acceleration signal output by the acceleration sensor 11 is set as the acceleration presentation target signal in the lighting control unit 125.

When a high-speed camera is used as the camera 21, the lighting control unit 125 is set to the hue control mode or the brightness control mode, and when an event-based camera is used as the camera 21, the lighting control unit 125 is set to the brightness control mode.
Then, the object to be detected 9 is put into operation, photographed by the camera 21, and the photographed video is recorded in the video recorder/player 22. The light emission color of the full-color LED 16 of each vibration detector 1 in the photographed video photographed by the camera 21 represents the acceleration at the position where the vibration detector 1 is disposed at the time of photographing, and therefore the photographed video recorded in the video recorder/player 22 represents the acceleration at each position of the object to be detected 9 at each time.

After the shooting is completed, the shooting video recorded in the video recorder/player 22 is read out in the analysis device 23 to analyze the operational vibration mode of the detection object 9 .
With this analysis, an automobile is used as the detected object 9, and multiple vibration detectors 1 are arranged on the left side of the automobile as shown in Figure 5a, making it possible to analyze the actual operating vibration mode in which the left side of the automobile vibrates in the left-right direction of the automobile as shown in Figure 5b.
Here, the band extracted by the variable frequency filter 121 is matched to the band to be confirmed, the object to be detected 9 is put into operation, and an image is taken with the camera 21. By playing back the recorded image in slow motion using the video recorder/player 22, a simple visual analysis of the vibration mode in operation can also be performed.

The operational analysis performed by such a vibration analysis system 2 is not limited to the analysis of natural modes excited in an operational state, but can be applied to the operational analysis of various vibration characteristics of the object to be detected 9 by combining the setting of the presentation mode, the setting of the signal to be presented for acceleration, the signal to be calculated for vibration acceleration level, and the signal to be calculated for vibration level, and the setting of the frequency characteristics of the variable frequency filter 121.

Next, a vibration analysis system 3 shown in FIG. 6 can also be constructed using the vibration detector 1 according to this embodiment.
This vibration analysis system 3 has a configuration in which an analysis device 31 is connected to the output interface 17 of each vibration detector 1, and the analysis device 31 performs the required analysis, such as frequency analysis, on the detection signals whose values are represented by the signals output from the output interface 17 of each vibration detector 1 fixed to the detectable object 9 in an actual operating state, and calculates various characteristics of the vibration of the detectable object 9.

Next, the acceleration sensor 11 of the vibration detector 1 can be configured to detect acceleration in two or three axial directions.
When using an acceleration sensor 11 for detecting acceleration in three axial directions, i.e., x, y, and z, three sets of calculators 12, LED drivers 15, and full-color LEDs 16 are provided in one-to-one correspondence with the three axes, as shown in FIG. 7a, and each set processes acceleration in the corresponding axial direction.

In this case, it may be possible to selectively operate only the sets corresponding to some of the axes.
As shown in Fig. 7b, the full-color LEDs 16 of each set may be arranged on three different faces of the vibration detector 1. In this case, the face on which the full-color LEDs 16 of each set are arranged may be a face perpendicular to the axis corresponding to that set.
Furthermore, the acceleration sensor 11 of the vibration detector 1 may output an acceleration that is a composite of accelerations in two or three axial directions.
Alternatively, the acceleration sensor 11 may be configured to detect acceleration in two or three axial directions, and the vibration detector 1 may be configured to process the combined acceleration of the accelerations in each axial direction output by the acceleration sensor 11.
For example, when an acceleration sensor 11 that detects acceleration in three axial directions, x, y, and z, is used, a synthesis unit 18 that synthesizes and outputs the acceleration in the three axial directions output by the acceleration sensor 11, and a selector 19 are provided in the vibration detector 1, as shown in Fig. 8. The selector 19 selects either the acceleration in any axial direction output by the acceleration sensor 11 or the output of the synthesis unit 18 in accordance with the setting from the function setting unit 13, and outputs the selected acceleration to the calculator 12. The calculator 12 then performs the above-mentioned processing using the output from the selector 19 instead of the output from the acceleration sensor 11.

The above vibration detector 1 may further selectively perform an operation in the lighting control unit 125 to change the light color of the full-color LED 16 so as to present the acceleration presentation target signal, the vibration acceleration level, the time average of the vibration level, the absolute value of the acceleration presentation target signal, the peak value of the vibration acceleration level, the vibration level, or the maximum value of the peak value.

Furthermore, the lighting control unit 125 may perform control so that both the hue and brightness of the emitted light of the full-color LED 16 are changed.
In addition, in accordance with operator instructions received via the external interface 14, the function setting unit 13 changes the time constant for vibration acceleration level detection in the vibration acceleration level calculation unit 122, the time constant for vibration level detection in the vibration level calculation unit 123, and the time constant for detection of the acceleration presentation target signal in the lighting control unit 125, and in the acceleration presentation mode, the lighting control unit 125 may detect the magnitude of the acceleration presentation target signal using the set time constant and change the light color of the full-color LED 16 according to the detected magnitude.

When the rate of change of acceleration detected by the acceleration sensor 11 is large, when the vibration detector 1 is used to visually recognize the vibration state from the full-color LED 16, the rate of change of the light color of the full-color LED 16 can be set to a relatively large value so that the rate of change of the light color of the full-color LED 16 is at a level at which the change in the light color can be easily recognized visually, thereby making it possible to recognize the vibration state from the light color.

In this case, when the vibration detector 1 is used as part of the vibration analysis system 3 shown in FIG. 4, the vibration analysis system 2, or FIG. 6, each time constant can be made smaller to enable more precise analysis than when the vibration state is recognized by visual inspection of the full-color LED 16.

1... vibration detector, 2... vibration analysis system, 9... object to be detected, 11... acceleration sensor, 12... calculator, 13... function setting section, 14... external interface, 15... LED driver, 16... full-color LED, 17... output interface, 18... synthesis section, 19... selector, 21... camera, 22... video recorder/player, 23... analysis device, 121... variable frequency filter, 122... vibration acceleration level calculation section, 123... vibration level calculation section, 124... comparator, 125... lighting control section, 160... light guide.

Claims (8)

One or more vibration detectors are fixed to a detection target that is an object to detect a vibration state;
A camera and
A video recorder;
An analysis device,
the vibration detector includes an acceleration sensor, a computing unit, and a light-emitting device capable of varying light emission color;
the light emitted by the light-emitting device is visible from outside the vibration detector;
the computing unit detects a vibration state of the detection object from an output of the acceleration sensor, and changes a light emission color of the light-emitting device in accordance with the detected vibration state;
the camera photographs the one or more vibration detectors such that an image of light emitted by a light-emitting device of each vibration detector is included in the photographed image;
The video recorder records the images captured by the camera,
A vibration analysis system characterized in that the analysis device analyzes the vibration of the detected object based on the position of each vibration detector and the light color of the light-emitting device of each vibration detector, as represented in the captured image recorded on the video recorder.
2. The vibration analysis system of claim 1,
The vibration detector includes:
Equipped with a frequency filter with variable frequency characteristics,
The vibration analysis system according to claim 1, wherein the computing unit detects a vibration state of the detection object from an output of the acceleration sensor that has been passed through the frequency filter. 3. The vibration analysis system according to claim 1,
A vibration analysis system comprising: a time constant changing means for changing a time constant for detecting the vibration state of the computing unit of the vibration detector . 4. The vibration analysis system according to claim 1, 2 or 3,
A vibration analysis system characterized in that the calculator of the vibration detector detects the acceleration of the object to be detected as the vibration state, and changes the light emission color of the light-emitting device so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in response to the gradual change in the detected acceleration. 4. The vibration analysis system according to claim 1, 2 or 3,
The vibration analysis system is characterized in that the calculator of the vibration detector detects the vibration acceleration level of the detected object as the vibration state, and changes the light emission color of the light-emitting device so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in response to the gradual change in the detected vibration acceleration level . 4. The vibration analysis system according to claim 1, 2 or 3,
A vibration analysis system characterized in that the calculator of the vibration detector detects the vibration level of the object to be detected as the vibration state, and changes the light emission color of the light-emitting device so that at least one of the hue and brightness of the light emission color of the light-emitting device gradually changes in response to the gradual change in the detected vibration level . A vibration analysis system according to claim 1, 2, 3, 4, 5 or 6,
A vibration analysis system comprising: a range changing means for changing the correspondence between a range of change in the light color of the light emitting device caused by the computing unit of the vibration detector and a range of change in the vibration state. 4. The vibration analysis system according to claim 1, 2 or 3,
the vibration detector has a first operation mode and a second operation mode as switchable operation modes;
The vibration analysis system is characterized in that, when in a first operating mode, the calculator of the vibration detector changes the light color of the light-emitting device so that at least one of the hue and brightness of the light color of the light-emitting device gradually changes in accordance with the gradual change in the detected vibration state, and, when in a second operating mode, causes the light-emitting device to emit light in a first light color when the detected vibration state is within a predetermined normal range, and causes the light- emitting device to emit light in a second light color different from the first light color when the detected vibration state is not within the normal range.