Vibration transmission method and vibration transmission system

Abstract

To provide a new vibration transmission method and a vibration transmission system for transmitting vibration to a vibration object.SOLUTION: A vibration transmission method according to the present disclosure is a method for transmitting a vibration to an object of vibration using a vibration transmission device including a vibration generator, the method including driving the vibration generator with a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a vibration transmission method and a vibration transmission system. [Background technology]

[0002] A vibration actuator is disclosed in Patent Document 1. A vibration generator such as a vibration actuator can be used to transmit vibration to an object to which vibration is to be transmitted (vibration object). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-183814 Summary of the Invention [Problem to be solved by the invention]

[0004] The method for efficiently transmitting vibration to a vibrating object differs depending on the properties of the vibrating object, so providing a new and unprecedented vibration transmission method is valuable in itself.

[0005] An object of the present disclosure is to provide a new vibration transmission method and vibration transmission system for transmitting vibration to a vibration target. [Means for solving the problem]

[0006] The vibration transmission method according to the first aspect is a vibration transmission method for transmitting vibrations to a vibration target using a vibration transmission device equipped with a vibration generator, in which the vibration generator is driven with a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal.

[0007] The vibration transmission method according to this aspect is a method for transmitting vibration to a vibration target using a vibration transmission device including a vibration generator.

[0008] However, there are some vibration targets that are difficult for high-frequency vibrations to propagate through, and high-frequency vibrations cannot be propagated over long distances. In other words, in such vibration targets, it is difficult to propagate high-frequency vibrations deep into the vibration target. Therefore, in this embodiment, the vibration generator is driven by a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal. Therefore, the high frequency vibration can be transmitted to the depths of the vibration object using the low frequency fundamental signal, which is less likely to attenuate in the vibration object, as a carrier wave.

[0009] The "modulation" method in this embodiment is not limited to angle modulation (including frequency modulation and phase modulation), but may be amplitude modulation, for example. The vibration target is not particularly limited, but may be, for example, mash, soil, leaf mold, rice bran, food waste, biological tissue of the human body, etc. In order to transmit vibrations to the vibration target using a vibration transmission device, the vibration transmission device may be in direct contact with the vibration target, or a partition (for example, a container wall, layer, membrane, etc.) may exist between the vibration transmission device and the vibration target. In the present disclosure, low frequency means 10 to 400 Hz. In the present disclosure, high frequencies refer to 500 to 10,000 Hz.

[0010] A vibration transmission method according to a second aspect is the vibration transmission method according to the first aspect, wherein the modulation method is angle modulation.

[0011] In this embodiment, the modulation method is angle modulation. Therefore, vibrations caused by high frequency signals can be transmitted more effectively to the depths of the vibration target.

[0012] A third aspect of the vibration transmission method is the second aspect, wherein the vibration generator is a voice coil type vibration actuator having a resonance frequency of 30 to 150 Hz.

[0013] In this embodiment, the vibration generator is a voice coil type vibration actuator having a resonance frequency of 30 to 150 Hz. In this disclosure, the term "voice coil type vibration actuator" refers to a vibration actuator that includes a voice coil and a magnetic circuit, and in which at least one of the magnetic circuit and the voice coil functions as a vibrator. This makes it easier to ensure the excitation force of the vibration generator, and as a result, the vibration can be transmitted to a deeper part.

[0014] A fourth aspect of the vibration transmission method is the second aspect, wherein the frequency of the fundamental signal is within a range of ±20% of the resonance frequency of the vibration actuator.

[0015] This ensures the strength of the low frequency waves that function as carrier waves, allowing vibrations to propagate to greater depths.

[0016] A vibration transmitting method according to a fifth aspect is the vibration transmitting method according to any one of the first to fourth aspects, wherein the vibration target is unrefined mash.

[0017] In this embodiment, the vibration target is mash (including the base of sake). This allows the low-frequency fundamental signal to be used as a carrier wave to deliver high-frequency vibrations that are more likely to affect microbial activity to deeper areas, effectively influencing the fermentation process of the mash.

[0018] A vibration transmitting method according to a sixth aspect is the vibration transmitting method according to any one of the first to fourth aspects, wherein the vibration target is a living tissue.

[0019] In this embodiment, the vibration target is biological tissue. This allows shear waves to be excited within biological tissue. Furthermore, by receiving the reflected waves with a receiving device such as an ultrasonic probe, it is possible to measure uneven distribution of hardness (elasticity) in the fat, muscles, bones, internal organs, etc. that make up the human body. In particular, in the vibration transmission method of this embodiment, the vibration generator is driven by a modulated signal having a low-frequency wave as a basic signal, so that it is possible to observe deep areas from the surface of the skin compared to ultrasonic echoes, and there is a possibility that the resolution can be improved compared to when it is driven by a simple low-frequency signal.

[0020] The vibration transmission system according to the seventh aspect is a vibration transmission system for transmitting vibrations to a vibration target, and includes a vibration transmission device having a vibration generator and a control unit that controls the vibration transmission device, and the control unit drives the vibration generator with a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal. [Effects of the Invention]

[0021] According to the present disclosure, a new vibration transmission method and vibration transmission system for transmitting vibration to a vibration target are provided. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic diagram illustrating a vibration transmission method according to the present disclosure. [Figure 2] 1 is a schematic diagram illustrating a vibration transmission method according to the present disclosure. [Figure 3] 1 is a photograph showing the experimental setup. [Figure 4] FIG. 1 is a schematic diagram showing an experimental setup. [Figure 5] This is an example of an experiment using a 500 Hz sine wave as the drive signal. [Figure 6] This is an example of an experiment using a modulation signal in which a fundamental signal, which is a sine wave of 60 Hz, is phase-modulated with a signal of 500 Hz as the drive signal. [Figure 7] FIG. 10 is a diagram showing the comparison results in the vicinity of 500 Hz. [Figure 8] This is an example of an experiment using a 1000 Hz sine wave as the drive signal. [Figure 9] This is an example of an experiment using a modulation signal in which a fundamental signal, which is a sine wave of 60 Hz, is phase-modulated with a signal of 1000 Hz as the drive signal. [Figure 10] FIG. 10 is a diagram showing the comparison results in the vicinity of 1000 Hz. [Figure 11] This is an example of an experiment using a 2000 Hz sine wave as the drive signal. [Figure 12] This is an example of an experiment using a modulation signal obtained by frequency-modulating a fundamental signal, which is a sine wave of 60 Hz, with a signal of 2000 Hz as the drive signal. [Figure 13] This is an example of an experiment using a modulation signal in which a fundamental signal, which is a sine wave of 60 Hz, is phase-modulated with a signal of 2000 Hz as the drive signal. [Figure 14] This is an example of an experiment using a modulation signal obtained by amplitude-modulating a fundamental signal, which is a sine wave of 60 Hz, with a signal of 2000 Hz as the drive signal. [Figure 15] FIG. 10 is a diagram showing the comparison results in the vicinity of 2000 Hz. [Figure 16] This is an example of an experiment in which the intensity of the drive signal is changed from the example of the experiment in FIG. [Figure 17] This is an example of an experiment in which the intensity of the drive signal is changed from the example of the experiment in FIG. [Figure 18] FIG. 10 is a diagram showing the comparison results in the vicinity of 1000 Hz. DETAILED DESCRIPTION OF THE INVENTION

[0023] 1 and 2 are schematic diagrams showing the vibration transmission method of the present disclosure.

[0024] The vibration transmission method of the present disclosure is a method of transmitting vibration to a vibration target 90 using a vibration transmission device 10 including a vibration generator 40. Specifically, as shown in Fig. 1, the vibration generator 40 is driven while the vibration transmission device 10 is in contact with the vibration target 90. Also, as shown in Fig. 2, the vibration generator 40 is driven while the vibration transmission device 10 is in contact with a container 80 containing the vibration target 90. As a result, vibration is transmitted to the vibration target 90, and this vibration propagates through the vibration target 90.

[0025] The vibration target 90 is not particularly limited, but may be, for example, mash, soil, leaf mold, rice bran, food waste, etc. When the vibration target 90 is mash, transmitting an appropriate vibration can affect the fermentation process of the mash. Furthermore, when the vibration target 90 is soil, leaf mold, rice bran, food waste, etc., transmitting an appropriate vibration can affect the activity of microorganisms contained in the vibration target 90, thereby affecting the decomposition and fermentation processes. However, vibrations of frequencies that can affect the fermentation process, etc., may have difficulty propagating through these vibration targets 90.

[0026] Furthermore, the vibration target 90 may be, for example, biological tissue including a human body. When the vibration target 90 is biological tissue, shear waves can be excited within the biological tissue. Furthermore, by receiving the reflected waves with a receiving device (not shown) such as an ultrasonic probe, it is possible to measure uneven distribution of hardness (elasticity) of, for example, fat, muscle, bone, internal organs, etc. that make up the human body. The vibration transmitting device 10 and a receiving device such as an ultrasonic probe may be integrated into one device. Even when the vibration target 90 is biological tissue, it may be difficult for vibrations to be transmitted.

[0027] Therefore, in the vibration transmission method of the present disclosure, a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal is used as a drive signal for driving the vibration generator 40. Therefore, even in a vibration target 90 where high-frequency vibrations are difficult to propagate, the low-frequency fundamental signal serves as a carrier wave, and vibrations generated by the high-frequency signal can be transmitted deep into the vibration target 90. Note that using a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal as a drive signal does not necessarily increase the propagation distance of vibrations in the vibration target. However, by appropriately modifying the modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal depending on the type of vibration target 90, it is believed that a modulated signal that increases the propagation distance of vibrations in the vibration target can be found without excessive trial and error. Note that the modulation method is not particularly limited, but angle modulation (frequency modulation, phase modulation) is preferred.

[0028] In particular, when the vibration target 90 is a living tissue, it is possible to observe deeper areas from the skin surface compared to ultrasonic echoes. Also, there is a possibility that the resolution can be improved compared to when it is driven by a simple low-frequency signal.

[0029] The vibration generator 40 is not particularly limited, and may be, for example, an actuator or an exciter. The actuator may be, for example, a voice coil vibration actuator. A voice coil vibration actuator has a voice coil and a magnetic circuit, and the magnetic circuit functions as, for example, a mover (vibrator). The resonant frequency of the actuator is, for example, 30 to 150 Hz. The vibration direction of the vibration generator 40 is, for example, a direction parallel to the contact direction with the vibration target 90 or the container 80 (the left-right direction in Figures 1 and 2). In addition, in the present disclosure, an exciter refers to a vibration generator having a light vibrator, a high resonant frequency, and wide-band characteristics.

[0030] 1 and 2, the vibration transmission device 10 may be combined with a control unit 60 to form a vibration transmission system S. The control unit 60 is configured to control the vibration transmission device 10. The control unit 60 can be configured, for example, by a computer including a processor such as a CPU, a storage unit for storing a control program, and the like. [Example]

[0031] The inventors conducted experiments to confirm the effectiveness of the vibration transmission method of the present disclosure.

[0032] As shown in Figures 3 and 4, soil was placed in a polyvinyl chloride (PVC) pipe (PVC pipe), an actuator was placed at one end of the PVC pipe, and an acceleration sensor was placed near the other end. The PVC pipe was suspended by a string so that the axial direction of the PVC pipe was oriented horizontally. The vibration direction of the actuator was parallel to the axial direction of the PVC pipe. A lid member made of urethane foam was placed between the actuator and the PVC pipe to prevent the actuator from directly vibrating the PVC pipe. A voice coil type vibration actuator (resonant frequency of approximately 60 Hz) was used as the actuator.

[0033] Figure 5 shows an example in which a 500 Hz sine wave is used as the drive signal, and Figure 6 shows an example in which a modulated signal in which a 60 Hz sine wave fundamental signal is phase-modulated with a 500 Hz signal is used as the drive signal. Figure 7 shows the results of comparing FFT values ​​around 500 Hz and the results of comparing the ratio of FFT values ​​around 500 Hz to the input value.

[0034] 5 and 6, the graph on the top left shows the actuator drive signal, the graph on the bottom left shows the vibration detected by the acceleration sensor, and the graph on the right shows the FFT value.

[0035] As shown in Figure 7, the results of comparing the ratio of the FFT value to the input value around 500 Hz showed that no effect of modulation was observed.

[0036] Figure 8 shows an example in which a 1000 Hz sine wave is used as the drive signal, and Figure 9 shows an example in which a modulated signal in which a 60 Hz sine wave fundamental signal is phase-modulated with a 1000 Hz signal is used as the drive signal. Figure 10 shows the results of comparing FFT values ​​around 1 kHz and the results of comparing the ratio of FFT values ​​around 1 kHz to the input value.

[0037] As shown in Figure 10, when comparing the ratio of the FFT value to the input value around 1000 Hz, it was confirmed that the example in which a modulated signal was used as the drive signal had a clearly higher result at 939 Hz than the example in which a modulated signal was not used.

[0038] Fig. 11 shows an example in which a 2000 Hz sine wave is used as the drive signal, Fig. 12 shows an example in which a modulation signal obtained by frequency-modulating a 60 Hz sine wave fundamental signal with a 2000 Hz signal is used as the drive signal, Fig. 13 shows an example in which a modulation signal obtained by phase-modulating a 60 Hz sine wave fundamental signal with a 2000 Hz signal is used as the drive signal, and Fig. 14 shows an example in which a modulation signal obtained by amplitude-modulating a 60 Hz sine wave fundamental signal with a 2000 Hz signal is used as the drive signal. Fig. 15 shows the results of comparing FFT values ​​around 2000 Hz and the results of comparing the ratio of FFT values ​​around 2000 Hz to the input value.

[0039] As shown in Figure 15, when comparing the ratio of the FFT value to the input value around 2000 Hz, the example in which a modulation signal by frequency modulation was used as the drive signal showed a clearly higher result than the example in which a modulation signal was not used. Also, a certain degree of effect was confirmed in the example in which a modulation signal by phase modulation was used.

[0040] Fig. 16 shows an example in which a 1000 Hz sine wave is used as the drive signal, and Fig. 17 shows an example in which a modulated signal obtained by phase-modulating a 60 Hz sine wave fundamental signal with a 1000 Hz signal is used as the drive signal. Fig. 18 shows the results of comparing FFT values ​​around 1 kHz and the results of comparing the ratio of FFT values ​​around 1 kHz to input values. The difference from the examples in Figs. 8 to 10 is that the input strength has been increased.

[0041] Also in FIG. 18, it was confirmed that the example in which the modulated signal was used as the drive signal had a result at 939 Hz that was clearly higher than the example in which the modulated signal was not used.

[0042] The above examples confirmed that when the vibration target is soil, the vibration propagation distance within the vibration target can be extended by using a modulation signal obtained by modulating a 60 Hz sine wave fundamental signal with a high-frequency signal as the drive signal. However, using a modulation signal generated by modulating a low-frequency fundamental signal with a high-frequency signal as the drive signal does not necessarily extend the vibration propagation distance within the vibration target. However, by appropriately modifying the modulation signal generated by modulating a low-frequency fundamental signal with a high-frequency signal depending on the type of vibration target 90, it is believed that a modulation signal that extends the vibration propagation distance within the vibration target can be found without excessive trial and error. [Explanation of symbols]

[0043] S Vibration Transmission System 10. Vibration transmission device 40 Vibration generator 60 Control Unit 90 Vibration Target

Claims

1. A vibration transmission method for transmitting vibration to a vibration target using a vibration transmission device including a vibration generator, The vibration generator is driven by a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal. A vibration transmission method that propagates high-frequency vibrations.

2. The modulation method is angle modulation. The vibration transmission method according to claim 1 .

3. The vibration generator is a voice coil type vibration actuator having a resonance frequency of 30 to 150 Hz. The vibration transmission method according to claim 2 .

4. the frequency of the fundamental signal is within a range of ±20% of the resonant frequency of the vibration actuator; The vibration transmission method according to claim 3.

5. The vibration target is moromi, The vibration transmission method according to claim 1 .

6. The vibration target is a biological tissue. The vibration transmission method according to claim 1 .

7. A vibration transmission system for transmitting vibration to a vibration target, The vibration transmission system includes: a vibration transmission device including a vibration generator; a control unit that controls the vibration transmission device; Equipped with the control unit drives the vibration generator with a modulated signal generated by modulating a low-frequency fundamental signal with a high-frequency signal, A vibration transmission system that transmits high-frequency vibrations.

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