JP2020086157A - Vibration suppression device - Google Patents

Abstract

To provide a vibration suppression device capable of easily constructing a control system which stably and effectively suppresses vibration due to resonance transmission of an object.SOLUTION: A vibration suppression device 10 comprises: a sensor 12 for detecting vibration of a resonating control object 60 and outputting a vibration signal Ss; an exciter 18 for exciting the control object 60 in accordance with an input signal; a signal processing section 14 for outputting a signal obtained by filter-processing the vibration signal Ss input from the sensor 12; and an amplifier 16 for amplifying the signal output from the signal processing section 14 and inputting it to the exciter 18. The signal processing section 14 performs filter processing by a filter characteristic determined on the basis of a product of a reverse characteristic of an all-pass component being a remaining component obtained by removing a minimum phase component from a transfer function of a system including the sensor 12, the exciter 18 and the signal processing section 14, and an object frequency band of an object for suppressing vibration, which includes a resonance frequency of the control object.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vibration suppressing device, and more particularly to a vibration suppressing device that suppresses vibration of a target object due to resonance transmission.

As a conventional technique related to the vibration suppression device, for example, a feedback type active noise control device disclosed in Patent Document 1 is known. A feedback type active noise control device disclosed in Patent Document 1 is a feedback type active noise control device that reduces noise by interfering with noise by radiating a secondary sound. A one-dimensional duct with a sufficiently small cross-sectional dimension, a secondary sound emission speaker provided in the duct for emitting a secondary sound, and a secondary sound emission installed at a position farther from a noise source than the secondary sound emission speaker Error detecting means for detecting the sound pressure of a synthetic wave generated by the interference of the secondary sound emitted from the speaker and the noise, and the secondary pressure by performing electrical signal processing on the sound pressure detected by the error detecting means. A secondary sound generation filter for generating a sound signal and outputting it to the secondary sound emission speaker, wherein the secondary sound generation filter converts an input signal of the secondary sound emission speaker into an output signal of the error detection means. The electric signal output from the error detecting means is subjected to signal processing based on the inverse characteristic of the minimum phase characteristic in a predetermined frequency range of the electric-acoustic frequency response to be reached, and the high frequency component is reduced. ..

In addition, the active silencer disclosed in Patent Document 2 is also known. The active silencer disclosed in Patent Document 2 selectively passes a signal having a specific frequency from one or a plurality of noise detection means which are input means and an input signal of detected noise, and makes the passed signal have an opposite phase. In an active silencer including a control unit for converting and amplifying and one or a plurality of speakers as output means, the phase conversion rate and the amplification rate in the control unit can be adjusted individually or simultaneously. It has a feature.

By the way, in recent years, noise prevention has become an important issue in the environment of living environment due to the concentration and aggregation of houses in urban areas. For this reason, various sound insulation panels have been used as a means for preventing noise, but at present the satisfactory sound insulation performance is not obtained.
For example, a double-structured wall having an air layer in the middle or a glass window (double window) is used because it is lightweight and has relatively good sound insulation. It should be noted here that when a window is attached to a wall, the sound insulation performance of the window as a whole is often determined by the sound insulation performance of the window because the sound insulation performance of the window is relatively low. ..

The multiple window is generally a window in which two or more window glasses are arranged through an air layer, and has relatively high sound insulation performance. The double-glazed window is an example in the case of using two sheet glasses among the multi-glazed windows. In the field of residential windows, products that double the single window afterwards are on the market in order to meet various demands such as heat insulation including sound insulation and prevention of dew condensation. The high sound insulation performance of double glazing is due to the structure in which glass is sandwiched between air layers with a certain thickness. This principle is common to the well-known principle of sound insulation of sound insulation walls in architecture.

Here, the resonance transmission frequency f ₀ (Hz) in consideration of the window cross-sectional structure of the double window is expressed by the following formula. The characteristic of the double window is that the double window has a higher sound insulation performance in a frequency band higher than the resonance transmission frequency, rather than the double window having a single window.

m: areal density of one piece of glass (kg/m ² )
d: Air layer thickness (m)
ρ: Air density (kg/m3)
c: Sound velocity of air (m/s)

JP, 2002-55684, A JP-A-8-76772

By the way, it is known that the sound insulation performance of the double window is lowered in the vicinity of the resonance transmission frequency f ₀ due to the resonance caused by the air spring of the two sheets of glass and the air layer. Therefore, the resonance transmission frequency may be lowered to a bass range that is not important from a practical point of view. The resonance transmission frequency is lowered by increasing the thickness of the air layer, for example.

For example, since the lower limit of the sound insulation performance specified by JIS is the 125 Hz band, it is conceivable to design the resonance transmission frequency lower than this frequency band. As an example, when a float glass having a thickness of 6 mm is used, the required air layer thickness is about 70 mm. An air layer having a thickness of 300 mm is required by design in order to deal with the 63 Hz band sound included in traffic noise and city noise. When the thickness of the air layer is so thick, it is practically impossible to realize a double window with a float glass having a thickness of about 6 mm. In addition, it is expected that there will be greater architectural constraints on the means of thickening the air layer. That is, there is a limit to suppressing the influence of vibration caused by the resonance transmission frequency by using the method of lowering the resonance transmission frequency, and a new method for suppressing the influence of the resonance transmission frequency is required.

In addition, although the double window was illustrated and the sound insulation of the window was demonstrated above, the same circumstance exists also about the single window using single plate glass. That is, in the single plate glass, resonance does not occur due to the air layer, but resonance occurs due to plate vibration. Resonance due to this plate vibration also causes a decrease in sound insulation performance.Therefore, if there is a new method of suppressing the effect of the resonance transmission frequency, it is possible to improve sound insulation performance by suppressing resonance as in the case of double glass. is there.

In this respect, neither the feedback type active noise control device according to Patent Document 1 nor the active silencer according to Patent Document 2 presents a new method for suppressing the influence of the resonance transmission frequency. For example, the feedback type active noise control device according to Patent Document 1 uses the Smith method of so-called classical feedback control. Although it is a proven method, it is necessary to design a delay compensator circuit in addition to the secondary sound generation filter. Although Patent Document 1 refers to the minimum phase, Patent Document 1 does not assume that a control filter is used to develop the inverse amplitude characteristic of the transmission system. Further, the feedback type active noise control device according to Patent Document 1 has a structure in which a large external control force is applied in a frequency band where the output of the controlled system is small, and there is a problem that it is weak against noise and noise other than the controlled system.

Furthermore, in feedback control, it is necessary to pay attention to destabilization due to a decrease in the phase margin of the loop. That is, if the phase margin is reduced, problems such as oscillation at a specific frequency may occur. Therefore, a phase compensation circuit is generally arranged in the feedback loop system. As described above, the feedback type active noise control device according to Patent Document 1 also requires the phase compensation circuit. However, the provision of the phase compensation circuit in the control system itself is complicated, and the phase compensation circuit is also troublesome to design, and when the parameters of the control system change, it is basically necessary to redesign. Therefore, it is even more preferable if stable operation is possible without a phase compensation circuit.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a vibration suppressing device capable of easily constructing a control system that stably and effectively suppresses vibration of a target object due to resonance transmission. And

In order to achieve the above-mentioned object, the vibration suppressing device of the first aspect detects the vibration of a resonating controlled object and vibrates the controlled object according to an input signal and a sensor that outputs a vibration signal. A vibration exciter, a signal processing unit that outputs a signal obtained by filtering the vibration signal input from the sensor, and an amplifier that amplifies the signal output from the signal processing unit and inputs the signal to the vibration exciter. In the vibration suppressing device, the signal processing unit includes an all-pass component that is the remaining component obtained by removing the minimum phase component from the transfer function of the system including the sensor, the vibrator, and the signal processing unit. The filtering process is performed according to a filter characteristic determined based on a product of an inverse characteristic and a target frequency band of which vibration is to be suppressed, the target frequency band including the resonance frequency of the control target.

In the vibration suppressing device of the first aspect, a sensor that detects the vibration of the resonating control target and outputs a vibration signal, a shaker that excites the control target according to the input signal, and a sensor that inputs the vibration signal. In a vibration suppressing device including a signal processing unit that outputs a signal obtained by filtering the vibration signal, and an amplifier that amplifies the signal output from the signal processing unit and inputs the signal to a vibration exciter, the signal processing unit includes a sensor , The exciter, and the inverse characteristic of the all-pass component that is the remaining component obtained by removing the minimum phase component from the transfer function of the system that includes the signal processing unit, and the target frequency band for which vibration is suppressed, Filtering is performed with the filter characteristic determined based on the product of the target frequency band including the resonance frequency. As a result, it is possible to provide a vibration suppressing device that can easily construct a control system that stably and effectively suppresses the vibration of the object due to resonance transmission.

A vibration suppressor of a second aspect is the vibration suppressor of the first aspect, wherein the transfer function is a transfer characteristic from the amplifier to the vibrator and the sensor to a filter process of the signal processor. Is a function that represents.

In the vibration suppressing device of the second aspect, the transfer function is a function that represents the transfer characteristic from the amplifier to the vibration exciter and the sensor to the filter processing of the signal processing unit. This makes the filter design easier.

A vibration suppressing device according to a third aspect is the vibration suppressing device according to the first or second aspect, wherein the sensor is a vibration sensor that directly detects vibration of the control target, or air in contact with the control target. The microphone is a microphone that indirectly detects the vibration of the controlled object by detecting the vibration.

In the vibration suppression device of the third aspect, the sensor directly detects the vibration of the control target, or the microphone that indirectly detects the vibration of the control target by detecting the vibration of air in contact with the control target. Is what is. Accordingly, it is possible to select an appropriate vibration sensor according to the control target.

A vibration suppressor of a fourth aspect is the vibration suppressor according to any one of the first to third aspects, wherein the control target is one glass plate arranged in a window or air between the glass plates. It is a double glass plate arranged in the window with the layers sandwiched therebetween.

In the vibration suppressing device according to the fourth aspect, the controlled object is one glass plate arranged in the window part or a double glass plate arranged in the window part with an air layer sandwiched between the glass plates. .. This makes it possible to provide a vibration suppressing device that can easily construct a control system that stably and effectively suppresses vibrations due to resonance transmission in window portions of various forms.

A vibration suppressor according to a fifth aspect is the vibration suppressor according to any one of the first to fourth aspects, wherein the target frequency band is a plurality of frequency bands each including a different resonance frequency band, The filter characteristic is defined by adding the products of the inverse characteristic of the all-pass component and each of the plurality of frequency bands.

In the vibration suppression device of the fifth aspect, the target frequency band is a plurality of frequency bands each including a different resonance frequency band, and the filter characteristic is the product of the inverse characteristic of the all-pass component and each of the plurality of frequency bands. It is determined by adding. Accordingly, when the controlled object includes a plurality of resonance frequencies, it is possible to efficiently suppress the vibration caused by each resonance frequency.

A vibration suppressing device of a sixth aspect is the vibration suppressing device according to any one of the first to fifth aspects, in which the sensor and the vibrator are arranged at corresponding positions of the control target. ..

In the vibration suppressing device of the sixth aspect, the sensor and the vibrator are arranged at the corresponding positions of the controlled object. As a result, it becomes possible to efficiently perform feedback control of the vibration exciter using the vibration signal from the sensor as a control signal.

A vibration suppressor of a seventh aspect is the vibration suppressor of the sixth aspect, in the case where the controlled object is one glass plate arranged in a window, the sensor is provided on one surface side of the glass plate. It arranges, the said shaker is attached to the position corresponding to the said sensor of the other surface of the said glass plate, The said control object is a double glass plate arrange|positioned in the window part with the air layer sandwiched between each. In one case, the sensor is arranged on one surface side of one glass plate of the double glass plate, and the vibrator is attached to a position corresponding to the sensor on the other surface of the one glass plate. It is a thing.

In the vibration suppressing device of the seventh aspect, when the controlled object is one glass plate arranged in the window portion, the sensor is arranged on one surface side of the glass plate and the vibrator is arranged on the other surface of the glass plate. When the control target is a double glass plate placed in the window with an air layer sandwiched between them, the sensor is attached to one of the two glass plates. On one side of the glass plate, and the vibration exciter is attached to the other side of the one glass plate at a position corresponding to the sensor. As a result, it becomes possible to efficiently perform feedback control of the vibration exciter using the vibration signal from the sensor as a control signal.

According to the present disclosure, it is possible to provide a vibration suppressing device capable of easily constructing a control system that stably and effectively suppresses vibration of a target object due to resonance transmission.

It is a block diagram which shows an example of a structure of the vibration suppression apparatus which concerns on 1st Embodiment. It is a block diagram which shows the feedback control model of the vibration suppression apparatus which concerns on embodiment. 6 is a graph illustrating frequency characteristics of feedback control of the vibration suppression device according to the first embodiment. It is a block diagram which shows an example of a structure of the vibration suppression apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following, a window is exemplified as a control target of the vibration suppressing device, and a mode in which the vibration suppressing device according to the present invention is applied to the vibration suppressing device suppressing the vibration of the window will be described as an example. Further, in the following description, “insulating” is equivalent to “suppressing vibration”.

The vibration suppression device according to the present embodiment employs active sound insulation technology using electroacoustic equipment for the purpose of eliminating a sound insulation defect caused by resonance transmission in a window glass forming a window portion. More specifically, a vibration exciter is arranged on the plate glass, and a vibration sensor is arranged on the plate glass or in the air layer near the plate glass, and the negative feedback control based on the signal from the vibration sensor suppresses the vibration in the frequency band where the sound insulation defect occurs. The sound insulation defect is suppressed by performing the control. At that time, the resonance transmission frequency with low sound insulation performance of the window and the peripheral band of the resonance transmission frequency are limited by the control filter as the control target band, and a filter having an inverse characteristic of delay is configured to minimize the phase (delay compensation). I do. Therefore, the vibration suppressing device according to the present embodiment does not require a filter for phase compensation. In this embodiment, a bandpass filter (BPF) is used as an example of the control filter.

[First Embodiment]
A vibration suppressing device 10 according to the present embodiment will be described with reference to FIGS. 1 to 3. As shown in FIG. 1A, the vibration suppressing device 10 includes a vibration sensor 12, a signal processing device 14, an amplifier 16, and a vibration exciter 18. FIG. 1B shows a glass window 60 in which the vibration suppressing device 10 is arranged, and the glass window 60 is a plate glass 50-1, 50- arranged between the window frames 54-1 and 54-2. 2 (hereinafter, collectively referred to as “plate glass 50”). An air layer 52 is interposed between the plate glasses 50-1 and 50-2.

The vibration sensor 12 is arranged on one surface side of the plate glass 50-1 (the air layer 52 side is illustrated in FIG. 1A) and detects the vibration of the glass window 60. The vibration sensor 12 may be arranged in contact with the plate glass 50-1, or may be arranged apart from the plate glass 50-1. When the glass window 60 is placed in contact with the glass sheet 50-1, the vibration of the glass sheet 60-1 is directly detected as the vibration of the glass window 60, and when the glass window 60 is placed apart, the vibration of the glass window 60 is transmitted through the air layer 52. To detect. Although the vibration sensor 12 is arranged on the surface of the plate glass 50-1 in FIG. 1A, it may be arranged on the surface of the plate glass 50-2. Further, the vibration sensor 12 may be arranged not on the air layer 52 side but on the opposite side of the air layer 52. The position of the vibration sensor 12 on the surface of the plate glass 50-1 is not particularly limited, but the central portion of the plate glass 50-1 is more preferable.

The vibration sensor 12 is not particularly limited and, for example, an electromagnetic actuator, a piezoelectric sensor, a giant magnetostrictive element or the like can be used. When the vibration sensor 12 is arranged in contact with the plate glass 50, the vibration data of the plate glass 50 is acquired, and when the vibration sensor 12 is arranged apart from the plate glass 50 in the air layer 52, the sound pressure data of the air layer 52 is acquired. In addition, a microphone can be used as the vibration sensor 12 when the microphone is arranged in the air layer 52. The output of the vibration sensor 12 (vibration data or sound pressure data in the present embodiment, hereinafter, “sensor output Ss”) is output to the signal processing device 14 and becomes a control signal in the vibration suppressing device 10.

The signal processing device 14 performs predetermined signal processing on the sensor output Ss and outputs it to the amplifier 16. The signal processing executed by the signal processing device 14 is mainly filter processing for the sensor output Ss. The signal processing device 14 may include a storage unit such as a ROM that stores the characteristics of the control filter H described later. This filtering process in the signal processing device 14 produces a signal optimized for driving the shaker 18. Details of the filter processing according to this embodiment will be described later.

The amplifier 16 amplifies the signal received from the signal processing device 14 and generates a signal suitable for driving the vibration exciter 18 (hereinafter, “driving signal Sd”). That is, the amplifier 16 gives the signal from the signal processing device 14 the amplitude, driving capability, etc. required for driving the vibrator 18.

The shaker 18 is a portion that applies vibration to the plate glass 50-1 according to the drive signal Sd. The vibration applied from the shaker 18 to the glass sheet 50-1 is a signal obtained by filtering the sensor output Ss by the signal processing device 14, and the vibration of the glass sheet 50-1 that is unintentionally generated can be effectively suppressed. it can. In the present embodiment, the form of the vibrator 18 is not particularly limited, and for example, an actuator can be used.

In the present embodiment, there is no particular limitation on the relative positional relationship where the vibration sensor 12 and the vibration exciter 18 are installed. However, for example, when the vibration sensor 12 and the vibration exciter 18 are arranged on the surface of the plate glass 50, It is more preferable that they are arranged at corresponding positions on the plate glass 50, that is, at the same positions on the front and back of the plate glass 50. By arranging in this way, it becomes possible to efficiently perform feedback control of the vibrator 18 using the vibration signal from the vibration sensor 12 as a control signal.

The vibration suppressing device 10 configured as described above operates as follows. That is, in the present embodiment, the sensor output (control output) obtained by detecting the resonance in the plate glass 50 or the air layer 52 by the vibration sensor 12 is set as the control target, and the feedback (feedback) for inputting the control output to the vibration sensor 12 again. ) Control is executed. After the characteristics of the control filter H are added to the signal of the sensor output Ss acquired by the vibration sensor 12 by the signal processing device 14, the gain (gain) is adjusted by the amplifier 16 (amplifier) and input to the vibration exciter 18. To do. That is, the transfer function of the control filter H is created so that the vibration on the glass surface of the plate glass 50-1 is suppressed.

Next, a method of deriving the control filter H according to the present embodiment will be described.

The feedback control model of the vibration suppressing device according to the present embodiment is set to the model shown in FIG. 2, and the transfer functions G and H are defined as follows.
G: Transfer function from amplifier to exciter and vibration sensor to signal processor
H: Transfer function of control filter a: Gain of amplifier At this time, the transfer function G in the state where the negative feedback control is not performed is expressed by the following (Equation 1) by performing the negative feedback control.
G/(1+a・G・H) (Equation 1)
However, the symbol “·” means product.
In (Equation 1), when a is set to a large value, the transmissibility of the control system is reduced and vibration is suppressed. However, at a frequency where G·H is −1, when a is increased, the transmissibility increases conversely. Therefore, the magnitude of the gain a of the amplifier needs to be set appropriately.

Hereinafter, a method of deriving the control filter H according to the present embodiment will be described. Each symbol used in the following description is defined as follows.
G0: Complex amplitude at control target frequency Flt: Transfer function of band pass filter that selects control target frequency band including resonance frequency Fp: Transfer function of least squares error suppression filter Go: Minimum phase component of transfer function G Gi: All-pass component of transfer function G In conclusion, the transfer function of the control filter H is given by the following (formula 2). However, this H is an approximate value.
H=Flt/(Gi·G0) (Equation 2)
The derivation of (Equation 2) will be described below.

First, G'is defined by the following (formula 3).
G′=Flt·G (Equation 3)
Next, this G′ is decomposed into the minimum phase component Go and the all-pass component Gi, as shown in (Equation 4) below.
G′=Go·Gi (Equation 4)

Next, Go is normalized using the complex amplitude G0 at the peak of Go (controlled object), and Q shown in (Equation 5) below is defined.
Q=Go/G0 (Equation 5)
From (Equation 5), a resonance curve Q having an amplitude of 1 at the peak frequency is obtained from the observed value G. The control filter H is designed by using the least squares method so that the output G·H of the control system coincides with this Q, as shown in (Equation 6) below.
Fp・G・H'=Q (Equation 6)

Finally, in order to eliminate the characteristics of Fp used in the least squares method,
H=Fp·H' (Equation 7)
As a result, an approximate control filter H is created. That is, by substituting (Equation 7) into (Equation 6), G·H≈Q, and this is shown below using (Equation 3), (Equation 4), (Equation 6) below. By transforming as in Equation 8, Equation 2 is obtained.
H≒Q/G=Go/(G・G0)=(Flt・G)/(G・G0・Gi)
=Flt/(Gi·G0) (Equation 8)
That is, the control filter H is approximately obtained within the accuracy of the least squares method used by (Equation 8) (=(Equation 2)). The characteristic of (Equation 8) lies in 1/Gi, and this 1/Gi functions to optimize the phase. Here, since G0 is the complex amplitude of the minimum phase component Go at the frequency to be controlled, Q=Go/G0=1 at that frequency. Therefore, by increasing a, the amplitude of the control transfer system becomes smaller and the control becomes smaller. Is achieved.

Here, a supplementary description will be given regarding the control filter according to the present embodiment. Since the resonance system ideally does not have an all-pass component, the process of minimizing the phase is unnecessary. However, the actual control system includes the characteristics of the vibrator 18 and the vibration sensor 12 and has an all-pass component. Particularly, since a general signal processing device has a delay, the all-pass component is composed of a delay. Delay is the main factor that complicates the design of control filters in feedback control. Therefore, in the present embodiment, the frequency band to be controlled is limited by Flt, and a filter having an inverse characteristic of delay in that band is created.

Next, the effect of the control filter H according to the present embodiment will be described with reference to FIG. FIG. 3 shows an example of frequency characteristics of the transfer function GH measured for the glass window 60 having a certain resonance characteristic. 3A shows the frequency characteristic of the transfer function GH when the control filter H is configured by the signal processing device 14, and FIG. 3B is the transfer function GH when the control filter H is not configured by the signal processing device 14. <1> shows a gain frequency characteristic, and <2> shows a phase frequency characteristic. That is, the horizontal axis of each graph in FIG. 3 represents frequency (unit is Hz, expressed as “frequency (H)” in FIG. 3), and the vertical axis of <1> is gain (unit is dB, in FIG. 3, “GH”). (DB)”, and the vertical axis of <2> indicates the phase (the unit is deg (degree), and is expressed as “angle (deg)” in FIG. 3 ).

As shown in FIG. 3A <1> or FIG. 3B <1>, the resonance frequency of the glass window 60 in this example is about 57 Hz. As is clear by comparing FIG. 3(a)<2> and FIG. 3(b)<2>, the range where the output GH does not become −1, that is, the range where the phase is within ±180 deg, is the control filter H. It can be seen that the control method of the present embodiment configured as described above is wider, the frequency width that can be controlled can be widened, and the control effect can be increased.

As described above in detail, in the vibration suppressing device according to the present embodiment, the bandpass filter (BPF) limits the peripheral band of the resonance frequency at which the sound insulation performance of the window portion is low as the control target band, and the inverse characteristic of the delay is obtained. The minimum phase (delay compensation) is performed by using the filter provided. As a result, the sound insulation performance of the window part is improved with respect to the laminated glass through the air layer, and the active sound deadening control is performed only in the peripheral band of the resonance frequency where the sound insulation performance is low, and the sound insulation performance is improved overall. Is possible. Further, by providing the control output only to the frequency band in which the sound insulation performance of the window portion is low, the control output according to the present embodiment is optimized for the band in which the sound insulation effect is desired to be enhanced, and the sound insulation effect in the target frequency range is reduced. Can be increased. Furthermore, since the signal processing device 14 does not output the signal in a band where active sound insulation is not applied, the influence of noise can be suppressed.

In other words, in the vibration suppressing device according to the present embodiment, the control filter H only selects the frequency and adjusts the phase with respect to the output of the vibration sensor, and therefore controls the vibration of the window glass regardless of the resonance frequency band. You can Further, since the control signal is not output in the frequency band in which there is no sensor output, that is, in the frequency band in which vibration does not occur, the generation of noise can be suppressed. Furthermore, since a phase compensation circuit is not required, the control system can be designed easily, and a stable control system can be flexibly constructed even when the parameters of the control system change.

Further, in the vibration suppressing device according to the present embodiment, since the configuration in which the peripheral band of the resonance frequency with low sound insulation performance is limited by the bandpass filter as the control target band, the control target (in the present embodiment, When the window portion includes a plurality of resonance frequencies, it is easy to suppress the vibration caused by each resonance frequency.

In the present embodiment, a double window has been described as an example of the multiple window, but the present invention is not limited to this, and the same may be applied to multiple windows of triple or more.

[Second Embodiment]
The vibration suppressing device 10A according to the present embodiment will be described with reference to FIG. The vibration suppression device 10A is a form in which the control target of the vibration suppression device 10 according to the above-described embodiment is changed. That is, although the control target of the vibration suppression device 10A is also the window portion, the control target of the vibration suppression device 10A is a single plate glass 50 of the window frames 54-1 and 54-2 as shown in FIG. 4B. It is a glass window 62 arranged between them.

As shown in FIG. 4A, the vibration suppressing device 10</b>A also includes the vibration sensor 12, the signal processing device 14, the amplifier 16, and the vibration exciter 18, similarly to the vibration suppressing device 10. Since the configuration having the same reference numeral as the vibration suppression device 10 has the same function, the vibration suppression device 10A also uses the sensor output detected by the vibration sensor 12 as a control signal, and the control signal is filtered by the signal processing device 14, A drive signal is generated by the amplifier 16 from the signal after the filter processing, the vibrator 18 is driven by the drive signal, and vibration is applied to suppress the vibration of the plate glass 50.

As a result, by the vibration suppressing device 10A according to the present embodiment, a control system that stably and effectively suppresses the vibration due to the resonance transmission of the target even when the glass window as the control target is the single plate glass 50. It is possible to provide a vibration suppressing device that can be easily constructed.

10, 10A Vibration suppression device 12 Vibration sensor 14 Signal processing device 16 Amplifier 18 Vibrators 50, 50-1, 50-2 Plate glass 52 Air layers 54-1, 54-2 Window frame 60, 62 Glass window Sd Drive signal Ss Sensor output

Claims (7)

A sensor that detects the vibration of the resonating controlled object and outputs a vibration signal,
An exciter that excites the controlled object according to an input signal,
A signal processing unit that outputs a signal obtained by filtering the vibration signal input from the sensor,
An amplifier that amplifies the signal output from the signal processing unit and inputs the signal to the vibrator.
A vibration suppressing device including:
The signal processing unit has an inverse characteristic of an all-pass component which is a remaining component obtained by removing a minimum phase component from a transfer function of a system including the sensor, the exciter, and the signal processing unit, and a target of suppressing vibration. A vibration suppressing device that performs the filtering process according to a filter characteristic determined based on a product of a target frequency band and a target frequency band including the resonance frequency of the control target. The vibration suppressing device according to claim 1, wherein the transfer function is a function representing a transfer characteristic from the amplifier to the filter processing of the signal processing unit via the exciter and the sensor. The sensor is a vibration sensor that directly detects the vibration of the control target, or a microphone that indirectly detects the vibration of the control target by detecting the vibration of air in contact with the control target. The vibration suppressing device according to claim 2. The control target is one glass plate arranged in the window part, or a double glass plate arranged in the window part with an air layer sandwiched between the glass plates. The vibration suppression device according to the item. The target frequency band is a plurality of frequency bands each including a different resonance frequency band, the filter characteristic is determined by adding the product of the inverse characteristic of the all-pass component and each of the plurality of frequency bands. The vibration suppressing device according to any one of claims 1 to 4. The vibration suppressing device according to any one of claims 1 to 5, wherein the sensor and the vibration exciter are arranged at corresponding positions of the controlled object. When the control target is one glass plate arranged in the window, the sensor is arranged on one surface side of the glass plate, and the vibrator is associated with the sensor on the other surface of the glass plate. Attach it to the
When the controlled object is a double glass plate arranged in the window portion with an air layer sandwiched between them, the sensor is arranged on one surface side of one of the double glass plates. The vibration suppressor according to claim 6, wherein the vibration exciter is attached to a position corresponding to the sensor on the other surface of the one glass plate.