JP7593749B2 - Virtual vibration experience system - Google Patents

Description

The present invention relates to a virtual vibration experience system that allows users to simulate the experience of events caused by vibration, virtually experience the phenomena and sensations that occur in the human body when vibration occurs, and can also quantitatively measure them.

In large-scale facilities such as concert halls and live music venues, low-frequency vertical vibrations (vertical groove vibrations) are generated on the floor of the structure when a large number of audience members dance and jump to the music played by musicians.
In recent years, large-scale facilities such as concert halls and live music venues have become even larger and can accommodate extremely large audiences, and the power of low-frequency vertical vibrations generated by the audience dancing and jumping also becomes extremely large.

Here, as shown in FIG. 1, the high-power vertical vibration is transmitted to columns 102, foundations 103, etc. via the structural floor 101 of the large-scale facility 100, causing the ground 104 directly below the large-scale facility 100 to also vibrate in the vertical direction.
Furthermore, this vertical vibration is transmitted to the ground 105 surrounding the large-scale facility 100, but as it is transmitted to the surrounding ground 105, the vertical vibration is attenuated and the proportion of horizontal vibration increases.
If there is a building 106 nearby that has the same natural frequency as the propagating ground vibration, the building 106 will shake violently together with the ground vibration (resonance).

A construction method has been proposed that reduces the transmission of vibration to the surrounding ground by isolating the structural floors of large-scale facilities where vertical vibrations occur and reducing the vibration transmissibility, thereby preventing nearby buildings from resonating (see Patent Document 1).

In addition, a vibration prevention structure for a structural floor has been provided that is highly effective in attenuating vertical vibrations caused by vertical vibrations, does not create undesirable gaps or steps on the floor surface, does not complicate the structure of the structural floor, and does not require a large amount of time and cost for construction (see Patent Document 2).

JP 2006-057260 A JP 2019-090180 A

The vibration isolation method disclosed in Patent Document 1 and the vibration isolation structure disclosed in Patent Document 2 isolate the structural floors of large-scale facilities where vertical vibrations occur, reducing the vibration transmissibility, thereby reducing the transmission of vibrations to the surrounding ground and preventing nearby buildings from resonating.

When trying to prevent vertical vibrations, the vertical rigidity of the structure floor becomes softer than that of typical structure floors, and the vertical vibrations of the structure floor caused by the vertical vibrations tend to become larger.

However, there has been little research into the extent to which vertical vibrations in structural floors caused by vertical adhesion should be regulated, and no laws or standards have been established, making it difficult to determine an appropriate range for the vertical stiffness of structural floors.

The present invention was made in consideration of these conventional problems, and aims to provide a virtual vibration experience system that can simulate the events caused by vertical vibration, and can virtually experience the phenomena and sensations that occur in the human body at that time, as well as quantitatively measure them, so that the vertical stiffness of a structural floor can be determined that is appropriate for vibration, particularly vertical vibration.

In order to achieve the above object, the virtual vibration sensation system of the present invention comprises:
A virtual vibration experience system including an image generating device that generates an image when a virtual vibration occurs, a vibration generating device that generates a vibration when the virtual vibration occurs, and a vibration measuring device that measures the vibration when the virtual vibration occurs,
The image generating device is configured with a head mounted display worn by a subject,
The vibration generating device is composed of a vibration table on which the subject stands upright, and a vibration generating device that vibrates the vibration table in a vertical direction, a horizontal direction, or a combination of the vertical and horizontal directions,
The vibration measuring device is an accelerometer that can measure the acceleration of the vibration table by being attached to the vibration table,
The virtual vibration is a virtual vertical vibration,
A subject wearing the head-mounted display on his/her head stands upright on the vibration table or moves in sync with the image, and the vibration generating device vibrates the vibration table in the vertical direction, horizontal direction or a combination of vertical and horizontal directions to generate virtual vertical vibration. The vibration at the time when the virtual vertical vibration occurs is measured by the accelerometer, and an image made of virtual reality is displayed on the head-mounted display, and the phenomena and sensations occurring in the subject's body at the time when the virtual vertical vibration occurs are obtained as bodily experience data.

The head mounted display further generates sounds of virtual reality.
It is characterized by the fact that

The bodily sensation data is characterized in that it is an index of vibration tolerance and discomfort level felt and responded to by the subject in response to the virtual vibration.

The bodily sensation data is characterized in that it is a biological phenomenon quantity generated by the subject in response to virtual vibrations when a bodily sensation measuring device equipped with a biological sensor is worn by the subject on his/her body.

The body sensation measuring device is characterized in that it is a perspiration measuring device having a perspiration sensor connected to its tip and capable of measuring the amount of perspiration of the subject by fixing this perspiration sensor to the palm of the subject.

The virtual vibration experience system of the present invention allows users to virtually experience the events that occur when vibrations occur, particularly vertical vibrations, and allows users to virtually experience the phenomena and sensations that occur in the human body at that time, as well as to quantitatively measure them.

Then, objective data is collected regarding the phenomena and sensations experienced by the subjects in response to virtual vibration, particularly virtual vertical vibration, and based on that data, the vertical stiffness of the structural floor appropriate for vertical vibration can be determined.

FIG. 1 is an explanatory diagram showing the process of transmission of vertical vibration to the surrounding ground. 1 is a schematic diagram illustrating a virtual vibration experience system according to the present invention. FIG. 2 is a perspective view of a head mounted display. FIG. 2 is a perspective view of a vibration generating device. FIG. 13 is a perspective view showing a state in which a vibration sensation test is being carried out. FIG. 2 is a perspective view of the perspiration measuring device. FIG. 2 is a perspective view of an electroencephalogram measuring device. FIG. 2 is a perspective view of the cerebral blood flow measuring device. FIG . FIG. 13 is a diagram showing a difference in discomfort depending on vibration acceleration. FIG. 13 is a diagram showing a difference in discomfort depending on vibration acceleration. FIG. 13 is a diagram showing a difference in discomfort depending on vibration acceleration.

A preferred embodiment of the virtual vibration experience system of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, the virtual vibration experience system 100 is composed of an image generating device 10, a vibration generating device 20, a sensation measuring device 30, and a vibration measuring device 40.

The image generating device 10 is composed of a head mounted display (HMD) 11 as shown in FIG. 3.

The head-mounted display 11 is a goggle-type display device capable of displaying virtual reality (VR) images, and as shown in FIG. 3, a projection unit 11a is disposed on the front and a viewing unit 11b is disposed on the side.

When the subject P wears the head-mounted display 11 on his/her head, a virtual reality image is displayed on the projection unit 11a, and a predetermined sound is generated from the viewing unit 11b.

As shown in FIG. 4, the vibration generating device 20 is composed of a vibration table 21, a vibration generating device 22, and a vibration control device 23.

The vibration table 21 has a flat top surface, ensuring that the subject P can stand upright.

The vibration generating device 22 is designed so that the underside of the vibration table 21 can be firmly fixed to its upper surface, and the vibration member disposed inside it vibrates with an appropriate frequency and amplitude in the vertical direction, horizontal direction, or a combination of the vertical and horizontal directions.

The vibration control device 23 is capable of controlling the drive of the vibration generating device 22 to vibrate with an appropriate frequency and amplitude for a predetermined period of time.

Therefore, by operating the vibration generating device 22 and driving the vibrating member, the upper surface of the vibration generating device 22 vibrates in the vertical direction, the horizontal direction, or a combination of the vertical and horizontal directions with an appropriate frequency and amplitude, and correspondingly, the vibration table 21 also vibrates in the vertical direction, the horizontal direction, or a combination of the vertical and horizontal directions with a predetermined frequency and amplitude.

As shown in FIG. 5, the body sensation measuring device 30 is attached to the body of a subject P standing upright on a vibration table 21 to quantitatively measure phenomena and sensations occurring in the human body, and a measuring device equipped with various biosensors can be used.

Figure 6 shows a perspiration measurement device 31, which is configured to measure the amount of perspiration of subject P when virtual vibration occurs by fixing a perspiration sensor 31a connected to the tip of a cord 31b to the palm of the subject P.

Figure 7 shows an electroencephalogram measuring device 32, which is equipped with an electroencephalogram sensor 32a in a headset. By having the headset worn on the head of subject P, it is possible to measure the electroencephalogram of subject P when virtual vibrations are generated.

Figure 8 shows a cerebral blood flow measurement device 33, which is embedded in a headset with an irradiation device 33a equipped with a light-emitting diode that emits near-infrared light (approximately 800 nm) and a detection device 33b equipped with a photodiode that detects the reflected light that has passed through the brain. By having the headset attached to the forehead of subject P, it becomes possible to measure the cerebral blood flow of subject P when virtual vibration occurs.

The body sensation measuring device 30 is not limited to the above, and any suitable bio-measuring device that is equipped with sensors to measure electrocardiogram, heart rate, respiratory rate, etc. and can be easily attached to the subject P may be used.

The vibration measuring device 40 is composed of an accelerometer 41 that can be attached as appropriate, as shown in Figure 5.

As shown in FIG. 5, the accelerometer 41 is attached to the center of the top surface of the vibration table 21 and to the side of the subject P's body, so that it can measure the vertical or horizontal acceleration of the actual vibration table 21 and subject P during the virtual vibration test.

The virtual vibration sensation system 100 of the present invention is configured as described above and is used as follows.

First, as shown in FIG. 4, a vibration generating device 20 consisting of a vibration table 21, a vibration generating device 22, and a vibration control device 23 is placed at an appropriate position on the floor surface.

Next, as shown in FIG. 5, subject P is placed upright on the vibration table 21, the head-mounted display 11 is attached to the head of subject P, and the perspiration sensor 31a connected to the tip of the perspiration measuring device 31 is fixed to the palm of the subject P.

Furthermore, as shown in FIG. 5, an accelerometer 41 is attached to the center of the top surface of the vibration table 21 and to the side of the subject P's body.

Next, the virtual vibration experience system 100 is operated to display an image visually perceived in front of the vibration table 21 on the head-mounted display 11, and generate sound caused by virtual vibration.

At the same time, the vibration generating device 22 is operated to vibrate the vibrating member in the vertical direction, horizontal direction, or a combination of the vertical and horizontal directions with an appropriate vibration frequency and amplitude, thereby correspondingly vibrating the vibration table 21 in the vertical direction, horizontal direction, or a combination of the vertical and horizontal directions with a predetermined vibration frequency and amplitude.

This causes subject P to feel as if he or she is experiencing actual vertical, horizontal, or a combination of both vertical and horizontal vibrations, particularly vertical vibrations, and causes physical phenomena and sensations not normally seen, such as increased sweating, heart rate, and breathing rate, and peculiar brain waves.

These physical phenomena and sensations can be quantitatively measured over time by the bodily sensation measuring device 30, and can be acquired and collected as bodily sensation data when virtual vibrations occur, particularly when virtual vertical vibrations occur.

Here, by transmitting a vibration data signal of a certain vibration frequency and acceleration to the vibration generating device 22 by the vibration control device 23, the vibration table 21 can be vibrated in a vibration mode corresponding to this.

By varying the subject P, it is possible to obtain bodily sensation data corresponding to each vibration mode, taking into account characteristics such as age, gender, height, weight, etc.

In this manner, the bodily sensation data quantitatively measured from the subject P's virtual vibration experience, in particular the virtual vertical vibration experience, can be input into a computer, recorded, and collected.

Then, by appropriately processing the collected sensory data, it is possible to collect objective data regarding the phenomena and sensations experienced by subject P, and based on that data, it is possible to determine the appropriate vertical stiffness of the structure floor against vibrations, particularly vertical vibrations.

[Vertical vibration sensation test]
Next, a vertical vibration experience test was carried out using the virtual vibration experience system 100 to grasp the relationship between the vertical vibration of the structure floor and the discomfort caused to the viewer P.

As shown in Figure 5, subject P stood upright on the vibration table 21, and the vibration generating device 22 generated vertical vibrations at a vibration frequency of 2.3 Hz and with accelerations of 20 gal, 30 gal, and 50 gal.

24 subjects P were asked to wear the head-mounted display 11, and the test was conducted in a VR space consisting of video and music that recreated a concert environment, and subjects P were asked to experience virtual vertical vibrations.

Then, a questionnaire survey was conducted on the subject P regarding the vibration tolerance limit and the level of discomfort at this time, thereby understanding the relationship between vertical vibration and discomfort.
As the level of discomfort, the index shown in Table 1 was set.

When tests were conducted in an upright position against vibrations of 2.3 Hz, a frequency band that is likely to cause vertical vibrations, we asked, "What level of vibration is tolerable for a music venue floor?" and received the answer shown in Figure 9.

The discomfort felt by subject P at vibration accelerations of 20 gal, 30 gal, and 50 gal was summarized, and the results are shown in Figures 10 to 12. This shows that the discomfort increases dramatically at 50 gal.

As described above, according to the virtual vibration experience system 100 of the present invention, it is possible to simulate the experience of events that occur when vibration occurs, particularly when vertical vibration occurs, and it is possible to virtually experience the phenomena and sensations that occur in the human body at that time, as well as to quantitatively measure them.
This makes it possible to determine the vertical stiffness of the structural floor appropriate for vibration, particularly vertical vibration.

In addition to being able to determine the appropriate vertical stiffness of a structure's floor against vertical vibration, the method can also be applied when setting design standards for the vertical and horizontal vibrations of surrounding buildings that occur during vertical vibration.

It can also be applied to setting design criteria for the habitability of buildings against vertical and horizontal vibrations in high-rise buildings during earthquakes, especially long-period earthquakes, vertical and horizontal vibrations caused by the movement of transportation such as trains, buses, and automobiles, vertical vibrations caused by walking people, and even horizontal vibrations during storms.

Reference Signs List 100 Virtual vibration sensation system 10 Image generating device 11 Head mounted display 20 Vibration generating device 21 Vibration table 22 Vibration generating device 23 Vibration control device 30 Body sensation measuring device 31 Sweat measuring device 32 Electroencephalogram measuring device 33 Cerebral blood flow measuring device P Subject

Claims (5)

A virtual vibration experience system including an image generating device that generates an image when a virtual vibration occurs, a vibration generating device that generates a vibration when the virtual vibration occurs, and a vibration measuring device that measures the vibration when the virtual vibration occurs,
The image generating device is configured with a head mounted display worn by a subject,
The vibration generating device is composed of a vibration table on which the subject stands upright, and a vibration generating device that vibrates the vibration table in a vertical direction, a horizontal direction, or a combination of the vertical and horizontal directions,
The vibration measuring device is an accelerometer that can measure the acceleration of the vibration table by being attached to the vibration table,
The virtual vibration is a virtual vertical vibration,
A virtual vibration experience system characterized by having a subject wearing the head-mounted display on their head stand upright on the vibration table or move in accordance with an image, having the vibration generating device vibrate the vibration table in the vertical direction, horizontal direction or a combination of vertical and horizontal directions to generate virtual vertical vibration, measuring the vibration when the virtual vertical vibration occurs with the accelerometer, and displaying an image composed of virtual reality on the head-mounted display, and obtaining the phenomena and sensations occurring in the subject's body when the virtual vertical vibration occurs as bodily experience data. 2. The virtual vibration sensation system according to claim 1, wherein the head mounted display further generates sounds of virtual reality . 2. The virtual vibration experiencing system according to claim 1, wherein the bodily sensation data is a vibration tolerance limit and an indicator of a level of discomfort felt and answered by the subject in response to the virtual vibration . The virtual vibration experience system according to claim 1, characterized in that the bodily sensation data is a biological phenomenon quantity generated by the subject in response to the virtual vibration using a bodily sensation measurement device equipped with a biological sensor, which is attached to the body of the subject . The virtual vibration experience system described in claim 4, characterized in that the body sensation measuring device is a sweat measuring device that has a sweat sensor connected to its tip and can measure the amount of sweat of the subject by fixing this sweat sensor to the palm of the subject .

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