JP6986338B2 - Active vibration control device and active vibration control method - Google Patents

Description

The present invention relates to an active vibration control device for reducing vibration of a material that can be assumed to be a rigid body through which noise propagates, and an active vibration control method.

Conventionally, as a device for reducing noise from a noise source, an active muffling control device is known as shown in Patent Document 1, and the active muffling control device is a noise detection device for detecting noise from a noise source. A means, a muffling control unit provided with a noise control filter and generating a noise reduction signal for reducing noise from the detection signal of the noise detection means based on the control parameters of the noise control filter, and a noise corresponding to the noise reduction signal. Noise control based on both the noise reduction sound generating means for generating the reduced sound, the synthetic sound detecting means for detecting the synthetic sound of the noise and the noise reducing sound, and the detection signal of the noise detecting means and the detection signal of the synthetic sound detecting means. It includes an adaptive control unit having a digital circuit that determines the control parameters of the filter by digital signal processing (DSP).
In the technique disclosed in Patent Document 1, the adaptive control unit sets the control parameters of the noise control filter so that the noise reduction sound according to the noise state, which may constantly fluctuate, is generated from the noise reduction sound generating means. It is configured to be updated sequentially.
With this configuration, noise reduction sound is generated following the sequential fluctuation of noise, and the noise that sequentially fluctuates is satisfactorily reduced.

Japanese Unexamined Patent Publication No. 2000-89768

However, the conventional active muffling control device needs to be provided with two sound detection means, a noise detection means and a synthetic sound detection means, as a sensor, and also needs to be provided with a speaker as a noise reduction sound generation means. The whole thing was big. Furthermore, it is necessary to have a digital circuit that executes digital signal processing (DSP), which makes the configuration complicated and relatively expensive, so it is not practical and improved considering its widespread use in general housing. There was room for.

The present invention has been made in view of the aforementioned problem, and an object, in particular, it is possible satisfactorily realize a reduction in Noise, relatively simple and highly active vibration control system economical, and active vibration control The point is to provide a method.

The active vibration control device for achieving the above object is an active vibration control device that reduces the vibration of a material that can be assumed to be a rigid body through which noise propagates.
A vibration acceleration measuring unit that measures the vibration acceleration A × e ^iwt of the material, and a vibration acceleration measuring unit.
A signal adjustment unit that inverts the phase of the signal measured by the vibration acceleration measurement unit and increases or decreases the amplitude.
A vibration device that vibrates the material with a vibration pressure F based on the adjustment signal adjusted by the signal adjustment unit, and
^{When a delay time τ occurs between the vibration acceleration A × e iwt} measured by the vibration acceleration measuring unit and the phase of the adjustment signal input to the vibration exciter, the vibration acceleration measuring unit Adjust the phase difference wτ between the measured phase of the vibration acceleration A × e ^{iwt and} the phase of the adjustment signal input to the exciter within the range of −π / 2 <wτ <π / 2. Equipped with a phase adjustment unit consisting of an analog circuit that can be set in advance,
The point is that each of the above-mentioned parameters has the relationship shown in the following (Equation 1).
F = −B × e ^−iwτ (A × e ^itt + F) (Equation 1)
However, B is an amplification coefficient of the vibration pressure F by the vibration exciter and is a positive number.

The inventors have made intensive studies and as a result, the partition part made from a material that can be assumed rigid, and vibration occurs acceleration A × e ^iwt by noise from outside, the vibration pressure from the shakers F ^Therefore , a delay time of τ occurs between the phase of the adjustment signal input to the vibrating device and the vibration acceleration A × e itt at the partition portion measured by the vibration acceleration measuring unit, and the vibration pressure F. Assuming that the amplification coefficient is B, it is considered that the above relationship (Equation 1) is established.
The above (Equation 1) is solved for F, and the pressure applied to the partition portion is expressed as the following (Equation 2).
A × e ^itt + F = A × e ^itt / (1 + Be ^−iwτ ) (Equation 2)

The attenuation amount ΔL at this time is represented by the following (Equation 3).
^{ΔL = 20log} (1 + Be −iwτ) (Equation 3)

From the above (Equation 3), the attenuation amount ΔL increases as B increases if it is within the range of −π / 2 <wτ <π / 2. On the other hand, if the attenuation amount ΔL is outside the range of −π / 2 <wτ <π / 2, ^{it becomes negative when (1 + Be −iwτ} ) is less than 1, ^{and −∞ when (1 + Be −iwτ} ) becomes 0. Will be. Incidentally, when the attenuation amount ΔL is −∞, howling will occur.
That is, the inventors have obtained the finding that noise can be reduced by adjusting the phase difference wτ within the range of −π / 2 <wτ <π / 2, and have completed the invention.
Incidentally, the inventors have confirmed that noise can be satisfactorily reduced by adjusting the phase difference wτ within the range of −π / 2 <wτ <π / 2, according to an embodiment described later.

As described above, in the configuration in which the vibration acceleration measuring unit for measuring the vibration acceleration of the partition portion and the vibrating device for applying the vibrating pressure to the partition portion are provided, the phase difference wτ is particularly set to −π / 2 <wτ <π. By providing a phase adjustment unit that adjusts within the range of / 2 with an analog circuit, it is possible to satisfactorily reduce the noise propagating from the outside to the inside, and at the same time, realize a relatively simple and highly economical active vibration control device. can do.

Further features of the active vibration control device
The phase adjusting unit is set to adjust the phase difference wτ in the range of −π / 2 <wτ <π / 2 for low frequency vibration of at least 0 Hz or more and 200 Hz or less.

Normally, it is often relatively difficult to set the phase difference wτ in the range of −π / 2 <wτ <π / 2 in the phase adjusting unit in all frequency bands.
According to the above feature configuration, the phase adjusting unit adjusts the phase difference wτ to the range of −π / 2 <wτ <π / 2 for low frequency vibrations of at least 0 Hz or more and 200 Hz or less. The setting of the phase adjustment unit can be performed relatively easily as compared with the case of adjusting the phase difference wτ in the frequency band of.
As a result, in particular, an active vibration control device that can satisfactorily reduce low-frequency noise can be realized, for example, a house in the vicinity of a wind power generator that generates low-frequency noise that may affect human health. In such cases, low frequency noise can be suitably reduced.

Further features of the active vibration control device
The material is a planar member having a planar shape and a point-symmetrical shape with respect to a center point in a directional view orthogonal to the planar.
The vibration acceleration measuring unit and the vibration exciter are arranged at the center point.

Through diligent research, the inventors selected a planar member having a planar shape and a point-symmetrical shape with respect to the center point in the direction perpendicular to the planar as the target partition, and measured the vibration acceleration. It was experimentally confirmed that by arranging the part and the exciter at the center point of the planar member, the noise can be reduced better than the case where the portion and the exciter are arranged at a position deviated from the center point. There is.

Further features of the active vibration control device
The vibration acceleration measuring unit and the vibration exciter are integrally provided.

According to the above-mentioned feature configuration, by integrally providing the vibration acceleration measuring unit and the vibration exciter, for example, the installation work of the device can be performed more efficiently and easily.

The active vibration control method for achieving the above object is an active vibration control method for reducing the vibration of a material that can be assumed to be a rigid body through which noise propagates.
A signal adjustment step that inverts the phase of the signal measured by the vibration acceleration measuring unit that measures the vibration acceleration A × e ^{iwt of the material and increases or decreases the amplitude.}
A vibration step in which the material is vibrated by a vibration device at a vibration pressure F based on the adjustment signal adjusted in the signal adjustment step, and a vibration step.
^{When a delay time τ occurs between the vibration acceleration A × e iwt} measured by the vibration acceleration measuring unit and the phase of the adjustment signal input to the vibration exciter, the vibration acceleration measuring unit The phase difference wτ between the measured phase of the vibration acceleration A × e ^{iwt and} the phase of the adjustment signal input to the exciter is set in the range of −π / 2 <wτ <π / 2 by an analog circuit. Has a phase adjustment step to adjust,
The point is that each of the above-mentioned parameters has the relationship shown in the following (Equation 1).
F = −B × e ^−iwτ (A × e ^itt + F) (Equation 1)
However, B is an amplification coefficient of the vibration pressure F by the vibration exciter and is a positive number.

According to the above-mentioned feature configuration, as described above, it is possible to satisfactorily reduce the noise propagating from the outside to the inside, and it is possible to realize a relatively simple and economical active vibration control supplement method.

Schematic configuration diagram of the active vibration control device according to the embodiment In the first embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter. In the first embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter when the phase adjustment unit is operated. In the first embodiment, a graph showing the amplitude difference between the amplitude of the vibration acceleration measured by the pickup and the amplitude of the adjustment signal input to the exciter when the phase adjustment unit is operated. In the first embodiment, a graph showing a control result for a pure tone of 70 Hz. In the first embodiment, the graph which shows the control result for the composite sound of 70Hz-200Hz In the first embodiment, a graph showing the vibration distribution of the glass surface of the window glass when the control is performed for a pure tone of 70 Hz. In the second embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter. In the second embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter when the phase adjustment unit is operated. In the second embodiment, a graph showing a control result for a pure tone of 78 Hz. In the second embodiment, the graph which shows the control result for the composite sound of 50Hz-200Hz In the second embodiment, a graph showing the vibration distribution of the glass surface of the window glass when the pure tone of 130 Hz is controlled. In the third embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter. In the third embodiment, a graph showing the phase difference between the phase of the vibration acceleration measured by the pickup and the phase of the adjustment signal input to the exciter when the phase adjustment unit is operated. In the third embodiment, a graph showing a control result for a pure tone of 50 Hz. In the third embodiment, the graph which shows the control result for the composite sound of 50Hz-200Hz In the third embodiment, a graph showing the vibration distribution of the glass surface of the window glass when the control is performed for the pure tone of 109 Hz.

The active vibration control device 100, and active vibration control method according to an embodiment of the present invention, it is possible satisfactorily realize a reduction in Noise relates relatively simple and has high economy. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The active vibration control device 100 according to the embodiment reduces the vibration of the window glass G ( an example of a material that can be assumed to be rigid ) that separates the outdoor and the indoor in order to reduce the noise indoors, and is the window glass G. A pickup 11 (an example of a vibration acceleration measuring unit) that measures vibration acceleration A × e ^itt , and an amplifier 13 (an example of a signal adjusting unit) that inverts the phase of the signal measured by the pickup 11 and increases / decreases the amplitude. , The phase and ^{vibration of the vibration acceleration A × e itt} measured by the pickup 11 and the vibration device 14 that vibrates the window glass G with the vibration pressure F based on the adjustment signal adjusted by the amplifier 13. With an analog circuit 12 (an example of a phase adjustment unit) that can be set in advance so that the phase difference wτ from the phase of the adjustment signal input to the device 14 is adjusted in the range of −π / 2 <wτ <π / 2. It is configured with.
To add a description, the pickup 11, the analog circuit 12, the amplifier 13, and the exciter 14 are electrically connected, and the signal measured by the pickup 11 has the phase difference wτ described above in the analog circuit 12. The phase of the signal is inverted and the amplitude is adjusted by the amplifier 13, the adjustment signal from the amplifier 13 is input to the exciter 14, and the exciter 14 vibrates the window glass G.

As a result of diligent research, the inventors assumed that the window glass G was a rigid body, and ^{the vibration acceleration of A × e itt} was generated by the noise from the outside, and the vibration pressure from the exciter 14 was set to F. , There is a delay time of τ between the phase of the adjustment signal input to the exciter 14 and the vibration acceleration A × e ^itt in the window glass G measured by the pickup 11, and the excitation pressure F is amplified. Assuming that the coefficient is B, it is considered that the above relationship (Equation 1) is established.
The above (Equation 1) is solved for F, and the pressure applied to the window glass G as the partition portion is expressed as the following (Equation 2).
A × e ^itt + F = A × e ^itt / (1 + Be ^−iwτ ) (Equation 2)

The attenuation amount ΔL at this time is represented by the following (Equation 3).
^{ΔL = 20log} (1 + Be −iwτ) (Equation 3)

From the above (Equation 3), the attenuation amount ΔL increases as B increases if it is within the range of −π / 2 <wτ <π / 2.
That is, the inventors have obtained the finding that noise can be reduced by adjusting the phase difference wτ within the range of −π / 2 <wτ <π / 2, and have completed the invention.

Therefore, in the analog circuit 12 as the phase adjusting unit, the phase of the vibration acceleration A × e ^itt measured by the pickup 11 and the phase of the adjusting signal input to the exciter 14 are set before the control is executed. It is configured to be configurable before control so that the phase difference wτ is adjusted in the range of −π / 2 <wτ <π / 2.
Normally, it may be relatively difficult to set the phase difference wτ in the phase adjustment unit so as to adjust it within the range of −π / 2 <wτ <π / 2 in all frequency bands. many.
Therefore, in the analog circuit 12, it is preferable to set the phase difference wτ to be adjusted in the range of −π / 2 <wτ <π / 2 for low frequency vibration of at least 0 Hz or more and 200 Hz or less. As a result, the setting of the phase adjustment unit can be performed relatively easily as compared with the case where the phase difference wτ is adjusted in all frequency bands.
The analog circuit 12 preferably includes a known low-pass filter and a graphic equalizer dedicated to phase operation.

In the active vibration control device 100 according to the embodiment, both the pickup 11 and the exciter 14 have the pickup 11 and the exciter 14 in order to adjust the above-mentioned phase difference wτ in the range of −π / 2 <wτ <π / 2. It is preferable that they are provided in close proximity. In the embodiment, the two overlap each other in a direction orthogonal to the glass surface of the window glass G in a state where they are in contact with either one surface or the other surface of the glass surface of the window glass G, respectively. It is arranged in.

Further, as shown in the following examples, the inventors have a partition portion of a window glass G made of a planar member having a planar shape and a point-symmetrical shape with respect to a center point in a direction perpendicular to the plane. It has been confirmed that the configuration in which the pickup 11 and the exciter 14 are arranged at the above-mentioned center points is preferable in enhancing the effect of noise reduction.

In the active vibration control method using the above active vibration control device 100, the phase of the signal measured by the pickup 11 for measuring ^{the vibration acceleration A × e iwt of the window glass G is inverted and the amplitude is increased or decreased.} A vibration step in which the window glass G is vibrated by the vibration device 14 at the vibration pressure F based on the adjustment signal adjusted in the step and the signal adjustment step, and the vibration acceleration A × measured by the pickup 11 Includes a phase adjustment step in which the phase difference wτ between the phase of e ^{itt and} the phase of the adjustment signal input to the exciter 14 is adjusted in the range of −π / 2 <wτ <π / 2 by an analog circuit. It is a waste.
It should be noted that each of the above parameters has the relationship shown in the following (Equation 1).
F = −B × e ^−iwτ (A × e ^itt + F) ... (Equation 1)
However, B is the amplification coefficient of the vibration pressure F by the vibration exciter.

Hereinafter, examples performed in order to confirm the effects of the active vibration control device 100 and the active vibration control method of the present application will be described.
Incidentally, in the following embodiment, the transmitter 21 that generates sound waves in various frequency bands, the graphic equalizer 22 that can adjust the phase, amplitude, etc. of the sound waves, and the signal from the graphic equalizer 22 are used. Pseudo-noise is output from a virtual noise source 200 including a speaker 23 that generates pseudo-noise.

Incidentally, in the examples shown below, a YAMAHA Q2031B is used as the graphic equalizer 22, a Sony SA-W3000 is used as the speaker 23, and a RION PV-41 is used as the pickup 11. As the amplifier 13, Sony's FA5ES was used, and as the exciter 14, Vp604 of Acouve Lab was used.

[Example 1]
In the first embodiment, the thickness of the window glass G is 3 mm, and the pickup 11 and the exciter 14 are centered in both the horizontal direction and the vertical direction of the glass surface in a direction perpendicular to the glass surface of the window glass G. This is an example when the glass is arranged at a position (corresponding to the center point). In the first embodiment, PV-41 was used as the pickup 11, and VP604 was used as the exciter 14.
FIG. 2 is a graph showing the phase difference wτ between the phase of the vibration acceleration measured by the pickup 11 and the phase of the adjustment signal input to the exciter 14, and at 1000 Hz or less, 150 Hz, 300 Hz, or the like. Except for some frequencies, the phase difference wτ is within −π / 2 <wτ <π / 2. In the present application, in order to try to control the vibration of 200 Hz or less as a low frequency, the phase difference wτ of the vibration near 150 Hz is adjusted to −π / 2 <wτ <π / 2, as shown in FIG. Incidentally, for frequencies exceeding 200 Hz, as shown in FIG. 4, the low-pass filter constituting the analog circuit 12 was used, and the level was adjusted to be gradually lowered.

After adjusting the phase and amplitude, active control was performed for a pure tone of 70 Hz, which was the resonance frequency at the center of the window glass G, and a composite tone of 70 Hz to 200 Hz. The control results comparing before and after control are shown in FIGS. 5 and 6. At 70 Hz to be controlled, a 20 dB reduction was obtained, as shown in FIG. As shown in FIG. 6, a decrease of 5 dB was obtained on average from 70 Hz to 200 Hz, which is the control target, and a decrease of 20 dB was obtained at 70 Hz where the amount of decrease was maximum. From the above, it can be seen that the same amount of reduction is obtained at each frequency for both pure tones and compound tones.

Next, the vibration distribution on the glass surface of the window glass G was measured when the pure tone at the frequency (70 Hz) having the largest attenuation in the control band was controlled. FIG. 7 shows the vibration acceleration levels before and after control at 16 points for 1/4 of the glass surface. A decrease was obtained at 15 out of 16 points by active control. Of the 15 points that decreased, a decrease of 10 dB or more was obtained at 7 points, and the average decrease at 16 points was 9 dB. The one point that increased was the position of the vibration node, and the increase was limited to 1 dB. From the result, when the pickup 11 and the exciter 14 are arranged at the center (center point) of the upper, lower, left and right of the glass surface of the window glass G, it is possible to reduce the vibration of the entire surface of the window glass with one vibrator 14. It can be said that there is.

[Example 2]
In the second embodiment, the thickness of the window glass G is 3 mm, and the pickup 11 and the exciter 14 are viewed in a direction orthogonal to the glass surface of the window glass G, at the center position in the horizontal direction of the glass surface and in the vertical direction. This is an example when the glass is arranged at the upper end position. In the second embodiment, PV-41 was used as the pickup 11, and Vp604 was used as the exciter 14.
FIG. 8 is a graph showing the phase difference wτ between the phase of the vibration acceleration measured by the pickup 11 and the phase of the adjustment signal input to the exciter 14, and is compared with [Example 1]. Although the phase advance around 40 Hz is slightly large, the same tendency is observed for the phase difference wτ. Below 1000 Hz, the phase difference wτ of the exciter 14 is within −π / 2 <wτ <π / 2, except for some frequencies near 40 Hz and 85 Hz.
However, in this study, in order to try to control the vibration below 200 Hz, it is necessary to adjust the phase of the vibration near 40 Hz and 85 Hz to −π / 2 <wτ <π / 2. Further, for high frequency vibration in which it is difficult to set the phase difference wτ to −π / 2 <wτ <π / 2, an attempt was made to lower the level of the adjustment signal to the exciter 14.
The phase difference wτ near 85 Hz was adjusted so that −π / 2 <wτ <π / 2. In Example 2, the phase and level were adjusted using a low-pass filter (6 dB / oct) that gradually drops the level from 160 Hz. The results are shown in FIG. It can be seen that the phase difference wτ can be adjusted to −π / 2 <wτ <π / 2 in the vicinity of 85 Hz for 40 Hz and 85 Hz in which the phase difference wτ of π / 2 or more occurs. On the other hand, we tried to adjust around 40Hz, but it was difficult to adjust the phase difference wτ to −π / 2 <wτ <π / 2 with the analog filter used in this experiment. We also tried to lower the level around 40Hz, but it was difficult to adjust to lower the level because the phase difference wτ of the peripheral frequency increases when the level is lowered.

After adjusting the phase and amplitude, active control is performed at the center position in the horizontal direction of the glass surface and at the upper end position in the vertical direction for the pure tone of 78 Hz, which was the central resonance frequency of the window glass G, and the composite sound of 50 to 200 Hz. Was done. The control results comparing before and after control are shown in FIGS. 10 and 11. At 78 Hz, a slight decrease was obtained, as shown in FIG. Further, in the vicinity of 40 Hz, the value after control increases as compared with that before control, which is considered to be due to the phase difference wτ having a phase difference wτ of π / 2 or more.
As shown in FIG. 11, a decrease of 3.5 dB was obtained on average from 50 Hz to 200 Hz, which is the control target, and a decrease of 9 dB was obtained at 130 Hz where the amount of decrease was maximum.

Next, the vibration distribution of the glass surface was measured when the pure tone of 130 Hz was controlled. FIG. 12 shows the vibration acceleration levels before and after control at 16 points for 1/4 of the glass surface. A decrease was obtained at 13 out of 16 points by active control. Of the 15 points that decreased, 2 points showed a decrease of 10 dB or more, and the average decrease of 16 points was 4 dB. The three points that had increased were the positions of the vibration nodes, and the amount of increase at the most increased position was 6 dB. From this result, a certain control effect was obtained even at the center position in the horizontal direction of the glass surface and at the upper end position in the vertical direction.
However, considering the control of the entire glass surface, it is considered more effective to perform the control at the center of the glass surface.
That is, by comparing [Example 1] and [Example 2], it is preferable to arrange the pickup 11 and the exciter 14 in the center of the left, right, top, bottom, and center of the window glass G in terms of reducing low-frequency noise. I can say.

[Example 3]
In the third embodiment, the thickness of the window glass G is 5 mm, and the pickup 11 and the exciter 14 are centered in both the horizontal direction and the vertical direction of the glass surface in a direction perpendicular to the glass surface of the window glass G. This is an example when the glass is arranged at a position (corresponding to the center point). In the third embodiment, PV-41 was used as the pickup 11, and VP604 was used as the exciter 14.
FIG. 13 is a graph showing the phase difference wτ between the phase of the vibration acceleration measured by the pickup 11 and the phase of the adjustment signal input to the exciter 14, and is near 110 Hz and 250 Hz at 1000 Hz or less. Except for some frequencies, the phase difference wτ is within −π / 2 <wτ <π / 2. In the present application, it is necessary to adjust the phase of the vibration near 110 Hz to −π / 2 <wτ <π / 2, as shown in FIG. 14, in order to try to control the vibration of 200 Hz or less as a low frequency. .. For high-frequency vibrations exceeding 200 Hz, where it is difficult to set the phase difference wτ to −π / 2 <wτ <π / 2, a low-pass filter (6 dB / Oct) is used to send the adjustment signal to the exciter 14. I tried to lower the level.

It can be seen that the phase difference wτ can be adjusted to −π / 2 <wτ <π / 2 in the vicinity of 110 Hz and 250 Hz where the phase difference wτ of π / 2 or more occurs. It was very difficult to adjust the phase difference wτ to −π / 2 <wτ <π / 2 over a high range as compared with the case of 3 mm glass.

After adjusting the phase and amplitude, active control is performed at the center of the glass for the pure tone of 50 Hz and the composite sound of 50 to 200 Hz, which are the resonance frequencies of the center position in both the horizontal and vertical directions of the glass surface of the window glass G. gone. The control results comparing before and after control are shown in FIGS. 15 and 16.
At 50 Hz, which is the control target, a decrease of 5 dB was obtained as shown in FIG. As shown in FIG. 16, in the compound sound from 50 Hz to 200 Hz, a decrease of 5 dB was obtained on average, and a decrease of 16 dB was obtained at 109 Hz where the amount of decrease was maximum. On the other hand, in many of the control bands including around 80 Hz and around 200 Hz, almost no decrease was obtained. It is considered that this is because there were many frequencies in which the phase difference wτ was close to π / 2.

Next, the vibration distribution on the glass surface of the window glass G was measured when the pure tone with a frequency of 109 Hz was controlled. FIG. 17 shows the vibration acceleration levels before and after control at 16 points for 1/4 of the glass surface. Active control resulted in a reduction of 10 dB or more at all 16 points. The average decrease of 16 points was 14 dB. Compared with the control result (average 9 dB) at the center of the glass surface in the glass of 3 mm thickness, the amount of decrease was large under this condition, and the same amount of decrease was obtained regardless of the position of the node and the position of the abdomen. Regarding the cause of this, it seems that 109Hz, which was the control target this time, was easy to drop because it was a simple vibration that allowed a clean mode in the vertical direction. From this result, it is considered that the vibration of the entire glass surface can be reduced with one vibrator even under this condition.

[Another Embodiment] (1) In the above embodiment, a configuration example is shown in which the pickup 11 as the vibration acceleration measuring unit and the vibrating device 14 are individually provided with the window glass G sandwiched between them.
However, a configuration may be adopted in which both the pickup 11 and the exciter 14 are provided on one side of the glass surface of the window glass G.
Further, the pickup 11 and the exciter 14 may not be separate bodies but may be integrated.

(2) In the above embodiment, the configuration example in which the amplifier 13 as the signal adjusting unit and the analog circuit 12 as the phase adjusting unit are provided as separate bodies is shown, but both may be provided integrally. I do not care.

(3) In the above embodiment, an example is shown in which the material that can be assumed as a rigid body is a window glass. However, as long as it is made of a material which can be assumed rigid body, it can become an even target anything, for example, an outer wall and an inner wall of a building that separates the indoor and outdoor also may be subjected.

It should be noted that the configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

The active vibration control system of the present invention, and active vibration control method, it is possible satisfactorily realize a reduction in Noise, relatively simple and highly active vibration control system economical, and as an active vibration control methods, the effective available Is.

11: Pickup 12: Analog circuit 13: Amplifier 14: Exciter 100: Active vibration control device F: Excitation pressure G: Window glass wτ: Phase difference

Claims (5)

An active vibration control device that reduces the vibration of materials that can be assumed to be rigid bodies to which noise propagates.
A vibration acceleration measuring unit that measures the vibration acceleration A × e ^iwt of the material, and a vibration acceleration measuring unit.
A signal adjustment unit that inverts the phase of the signal measured by the vibration acceleration measurement unit and increases or decreases the amplitude.
A vibration device that vibrates the material with a vibration pressure F based on the adjustment signal adjusted by the signal adjustment unit, and
^{When a delay time τ occurs between the vibration acceleration A × e iwt} measured by the vibration acceleration measuring unit and the phase of the adjustment signal input to the vibration exciter, the vibration acceleration measuring unit Adjust the phase difference wτ between the measured phase of the vibration acceleration A × e ^{iwt and} the phase of the adjustment signal input to the exciter within the range of −π / 2 <wτ <π / 2. Equipped with a phase adjustment unit consisting of an analog circuit that can be set in advance,
An active vibration control device, characterized in that each of the above parameters has the relationship shown in the following (Equation 1).
F = −B × e ^−iwτ (A × e ^itt + F) (Equation 1)
However, B is an amplification coefficient of the vibration pressure F by the vibration exciter and is a positive number. The first aspect of the present invention, wherein the phase adjusting unit is set to adjust the phase difference wτ to the range of −π / 2 <wτ <π / 2 for low frequency vibration of at least 0 Hz or more and 200 Hz or less. Active vibration control device. The material is a planar member having a planar shape and a point-symmetrical shape with respect to a center point in a directional view orthogonal to the planar.
The active vibration control device according to claim 1 or 2, wherein the vibration acceleration measuring unit and the vibration exciter are arranged at the center point. The active vibration control device according to any one of claims 1 to 3, wherein the vibration acceleration measuring unit and the vibrating device are integrally provided. It is an active vibration control method that reduces the vibration of a material that can be assumed to be a rigid body through which noise propagates.
A signal adjustment step that inverts the phase of the signal measured by the vibration acceleration measuring unit that measures the vibration acceleration A × e ^{iwt of the material and increases or decreases the amplitude.}
A vibration step in which the material is vibrated by a vibration device at a vibration pressure F based on the adjustment signal adjusted in the signal adjustment step, and a vibration step.
^{When a delay time τ occurs between the vibration acceleration A × e iwt} measured by the vibration acceleration measuring unit and the phase of the adjustment signal input to the vibration exciter, the vibration acceleration measuring unit Adjust the phase difference wτ between the measured phase of the vibration acceleration A × e ^{iwt and} the phase of the adjustment signal input to the exciter within the range of −π / 2 <wτ <π / 2. It has a phase adjustment step that is preset in the analog circuit.
An active vibration control method, characterized in that each of the above parameters has the relationship shown in the following (Equation 1).
F = −B × e ^−iwτ (A × e ^itt + F) (Equation 1)
However, B is an amplification coefficient of the vibration pressure F by the vibration exciter and is a positive number.

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