JP2592713B2 - Damping and soundproofing devices - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration suppression device for suppressing vibration of an outer frame of a mechanical device having a motor and the like, and a soundproof device for suppressing noise.

[Conventional technology]

A problem in a mechanical device having a vibrating device such as a motor inside is that the vibration is transmitted to each part of the mechanical device, and each of them becomes a noise source. As a result, the entire machine becomes a noise source that emits a very high level of noise.

2. Description of the Related Art In recent years, demands for reducing noise levels have become increasingly severe. In particular, in home appliances, noise reduction is a major factor in determining the sales of such products.

If the machine is composed of a relatively small number of parts, measures should be taken to suppress the vibration of each part. In particular, in the case of a complex machine having a large number of parts, measures should be taken for each part. It becomes difficult.

Therefore, as a means for solving the above problem, there is a soundproof device such as a washing machine described in Japanese Utility Model Laid-Open No. 62-64483.

[Problems to be solved by the invention]

In the above-described conventional technology, when the spatial allowance inside the mechanical device is limited, no consideration is given to vibration or noise, and it may be difficult to provide soundproof means to the entire mechanical device.

It is an object of the present invention to reduce vibration of an outer frame of a mechanical device and to provide a vibration damping / soundproofing device that reduces noise generated from an opening in the mechanical device itself or the mechanical device.

[Means for solving the problem]

The above object is a soundproofing device including a soundproofing cover that covers a mechanical device having a noise source therein and is formed by stacking and bonding a plurality of piezoelectric sheets, and a control device for the soundproofing cover, One of the piezoelectric sheets detects the vibration of the soundproof cover and outputs a detection signal, and the control device inputs the detection signal and outputs a control signal for suppressing the vibration of the soundproof cover to the plurality of piezoelectric sheets. With a soundproofing device characterized by outputting to other piezoelectric sheets of the sheet,
Achieved.

Further, a driving member formed by laminating and laminating a wrapping member for covering a mechanical device having a noise source therein and a plurality of piezoelectric sheet pieces locally adhered to the wrapping member, and control for controlling the driving unit A soundproofing device comprising:
One of the plurality of piezoelectric sheets detects a vibration of the wrapping member and outputs a detection signal, and the control device outputs a control signal for suppressing the vibration of the wrapping member from the detection signal. This is achieved by a soundproofing device characterized by outputting to another of the piezoelectric sheet pieces of the above.

It is preferable to interpose an elastic vibration isolator between the mechanical device and the soundproof cover or between the mechanical device and the covering member.

Another object of the present invention is to provide a vibration control device comprising: a driving unit in which a plurality of piezoelectric sheet pieces adhered to an outer frame of a mechanical device having a noise source therein are laminated and bonded; and a control unit of the driving unit. An apparatus, wherein one of the plurality of piezoelectric sheet pieces detects a vibration of the outer frame and outputs a detection signal, and the control unit inputs the detection signal to reduce the vibration of the outer frame. This is achieved by a vibration damping device characterized by outputting a control signal to be suppressed to another of the plurality of piezoelectric sheet pieces.

The above object is further provided by combining any of the various soundproofing devices with a vibration damping device.
This is achieved by soundproofing.

[Action]

First, the operation of each of the soundproofing devices of the present invention will be described.

In a soundproofing device including a soundproofing cover in which a plurality of piezoelectric sheets are stacked and bonded together, and a control device for the soundproofing cover, when the mechanical device is operated, sound waves from a noise source cover the mechanical device. In the direction, one of the plurality of piezoelectric sheets detects the vibration and outputs a detection signal, and the control device converts the detection signal into a control signal that suppresses the vibration of the soundproof cover. Therefore, the signal is output to another of the plurality of piezoelectric sheets, and thus the other piezoelectric sheets are controlled by the control signal, so that the deformation of the soundproof cover in the surface direction is suppressed, and the noise transmitted from the soundproof cover to the outside is reduced. I do.

In a soundproofing device including a wrapping member, a driving unit and a control unit which are formed by laminating a plurality of piezoelectric sheet pieces locally adhered to the wrapping member, when a mechanical device is operated, an acoustic wave from a noise source is generated. Vibrates the wrapping member covering the mechanical device in the surface direction, one of the plurality of piezoelectric sheet pieces detects the vibration and outputs a detection signal, and the control device wraps the detection signal. The control signal is converted into a control signal that suppresses vibration of the covered member and is output to another of the plurality of piezoelectric sheet pieces. Thus, the other piezoelectric sheet pieces operate to suppress deformation of the covering member, and Noise transmitted from the member to the outside is reduced.

When a vibration isolator made of an elastic body is provided between the mechanical device and the soundproof cover or the wrapping member,
Attenuates vibrations propagating from the mechanical device to the soundproof cover or wrap member.

 Next, the operation of the vibration damping device of the present invention will be described.

In a vibration damping device configured by a driving unit and a control unit that are formed by laminating a plurality of piezoelectric sheet pieces stuck on an outer frame of a mechanical device, and when the mechanical device is operated, a noise source is generated. The sound wave causes the outer frame to vibrate, and one of the plurality of piezoelectric sheet pieces detects the vibration and outputs a detection signal, and the control device controls the detection signal to suppress the vibration of the outer frame. The signal is converted to a signal and output to another of the plurality of piezoelectric sheet pieces. Thus, the control signal causes the piezoelectric sheet piece to operate to suppress deformation of the outer frame, thereby suppressing vibration of the outer frame.

In a vibration damping / sound damping device configured by combining any one of the various sound damping devices with the vibration damping device, when a machine device is operated, a vibration generated in an outer frame of the machine device due to a sound wave from a noise source thereof is suppressed. The vibration device attenuates it, thereby suppressing the transmission of sound waves to the outside of the outer frame, and furthermore, sound waves transmitted from the outer frame are attenuated by the soundproofing device to perform soundproofing.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a basic configuration diagram of the vibration damping / soundproofing device of the present invention. In FIG. 1, a vibration damping / soundproofing device includes a vibration damping device having a function of suppressing vibration of an outer frame 21 of a mechanical device 30 having a noise source 20 such as a motor therein, and a mechanical device covering the mechanical device 30. And a soundproofing device having a function of suppressing the noise generated from the device.

The vibration damping device includes a driving unit 2 as driving means installed on the outer frame 21 and a vibration damping control device 6 for controlling the driving unit 2.
Then, the drive unit 2 detects the vibration of the outer frame 21 generated by the sound wave from the noise source 20 and transmits a detection signal 7 to the control device 6, and the control device 6 responds to the detection signal 7 by the drive unit 2 The control signal 8 for suppressing the vibration of the outer frame 21 is transmitted to the driving unit 2, and thus the vibration of the outer frame 21 is suppressed.

On the other hand, the soundproofing device includes a soundproofing cover 1 that covers the mechanical device 30 and a control device 3 that controls the soundproofing cover 1. The soundproofing cover 1 transmits sound waves transmitted by the vibration of the outer frame 21 that could not be cut off by the vibration damping device. The control device 3 detects the detection signal 4
The control signal 5 for suppressing the vibration of the soundproof cover 1 is transmitted to the soundproof cover 1 in response to the above, and thus the soundproofing is performed by suppressing the vibration of the soundproof cover 1. The structures of the drive unit and the soundproof cover will be described in an embodiment described later.

The above has described the basic configuration of the vibration damping / sound damping device. Hereinafter, embodiments of the sound damping device and the vibration damping device will be described in detail.

FIG. 2 is a view showing one embodiment of the soundproofing device of the present invention. In FIG. 2, a soundproof device is a soundproof cover 1 installed over a mechanical device 30 and a control device 3 for the soundproof cover 1.
And is constituted by. The function of the soundproof cover 1 to be further deformed by an external input (hereinafter referred to as a deforming function).
And a function of detecting deformation of the soundproof cover 1 itself (hereinafter, referred to as a detecting function). For example, as shown in FIG. 19, a piezoelectric sheet is formed by bonding a plurality of piezoelectric films in a plane. It has a structure in which piezoelectric film groups 31 are stacked and bonded. The piezoelectric film group 31 has a function of generating a voltage by deforming in an out-of-plane direction by applying a voltage and conversely, deforming in an out-of-plane direction, and is configured as a soundproof cover by this function. It becomes possible. The soundproof film 1 is composed of piezoelectric film groups 31a, 31
One of b is provided with a deformation function, and the other is provided with a detection function. The bonding method of the piezoelectric film or the piezoelectric film group 31 may be, for example, by using an adhesive, but it is not particularly limited to an adhesive as long as the same performance can be obtained. Note that the soundproof cover 1 can be mounted on the mechanical device 30 or the soundproof cover 1 by an appropriate supporting method.
It is supported on the outside by a suitable support member (not shown).
However, there is no particular limitation on the supporting method.

Next, the operation of the soundproofing device of this embodiment will be described.
For example, when a part or the whole of the soundproof cover 1 is to be deformed in an out-of-plane direction by a sound wave of noise emitted from the mechanical device 30, the soundproof cover 1 is controlled by a control input 5 as an appropriate control signal from the control device 3. Is to be deformed in a direction opposite to the deformation direction. Thereby, the deformation of the soundproof cover 1 in the out-of-plane direction is suppressed small, and the propagation of noise from the inside of the soundproof cover 1 to the outside of the soundproof cover 1 is suppressed.

If the soundproof cover 1 is not controlled, the soundproof cover is deformed by the sound waves of the noise emitted from the mechanical device 30, that is, emits noise to the outside.

In this embodiment, the soundproof cover 1 has a function of sensing deformation of the soundproof cover 1 itself as described above, and forms a closed-loop feedback control system by coupling with the control device 3. Note that the control device 3 does not need to be particularly limited as long as the above operation can be realized.
The configuration shown in FIG. 18 may be used.

In FIG. 18, the control device 3 includes an amplifier 3a, a gain adjuster 3b, a voltage generator 3c, and a voltage amplifier 3d. A small detection signal from the soundproof cover 1 accompanying the deformation of the soundproof cover 1 is first amplified by the amplifier 3a. Next, the detection signal is multiplied by an appropriate control gain by a gain adjuster 3b, and a voltage corresponding thereto is generated by a voltage generator 3c, which is further amplified by a voltage amplifier 3d and finally applied to the soundproof cover 1. Applied.

The control device 3 in the embodiment of the soundproofing device described below has the configuration shown in FIG. 18 unless otherwise specified.

FIG. 3 is a diagram showing another embodiment of the soundproofing device. The mechanical device 30 is covered with a soundproof member 10 as a covering member having a function of deforming into an arbitrary shape by applying an external force of metal, wood, plastic, cloth, or the like. It should be noted that there is no particular problem even if the material of the soundproof member 10 is other than the above as long as it has the above function.

Further, the soundproofing member 10 has one or a plurality of driving units 2a and 2b having a function of deforming the soundproofing member 10 or a function of applying a force to the soundproofing member 10.

In the present embodiment, the driving units 2a and 2b detect the deformation function of deforming the soundproof member 10 by applying an external input or the deformation function of applying a force to the soundproof member 10 and the deformation of the soundproof member 10 as described above. For example, as shown in FIG. 20, a small piezoelectric element group 32 in which a plurality of piezoelectric elements are horizontally attached to each other is stacked and attached. The piezoelectric element group 32 is also the piezoelectric film group 31 described above.
And the driving unit 2 can be configured. In FIG. 20, two piezoelectric element groups 32a,
Either of 32b may be used as the transformation function or the detection function. The method of joining the piezoelectric element groups 32 as the piezoelectric sheet pieces to each other is described in detail below.
There is no particular limitation as long as the two are joined to such an extent that they can follow each other's movements. The same applies to the connection between the drive unit 2 and the soundproof member 10.

 Next, the operation of the present embodiment will be described.

The soundproof member 10 is generated by the sound waves of the noise generated from the mechanical device 30.
When the soundproof member 10 is deformed in the out-of-plane direction,
The control unit 6 attempts to deform the drive units 2a and 2b by the control inputs 8a and 8b from the control device 6 so that the portion where the drive units 2a and 2b are installed is deformed in the direction opposite to the deformation direction. . Alternatively, a force is applied to the soundproof member 10 by the driving units 2a and 2b.
The local deformation of the soundproof member 10 due to this is transmitted to the entire soundproof member 10, and the soundproof member 10 performs the same operation as the soundproof cover 1. Thereby, the deformation of the soundproofing member 10 in the out-of-plane direction is suppressed small, and the propagation of noise from the inside of the soundproofing member 10 to the outside of the soundproofing member 10 is suppressed.

Further, in the present embodiment, in order to deform the driving units 2a, 2b or to smoothly transmit the force from the driving units 2a, 2b to the soundproof member 10, a fourth space between the driving units 2a, 2b and the soundproof member 10 is used. In the case where the supporting members 11a and 11b are provided as shown in FIG.
There is a soundproofing effect as in the embodiment shown in the figure. The drive units 2a and 2b and the support members 11a and 11b, and the support members 11a and 11b and the soundproof member 10 are joined by joining means such as adhesion. However, there is no particular limitation on the joining means that enables the above operation, and there is no particular limitation on the shape and size of the support members 11a and 11b.

FIG. 5 is a diagram showing another embodiment of the soundproofing device. This embodiment shows a case where the control device 3 is included inside the soundproof cover 1 in the embodiment shown in FIG. In the present embodiment, an accumulator (not shown) for storing electric power in the control device 3 is provided. As a soundproofing device, its function can be easily achieved only by installing the soundproofing cover 1. It is characterized by being possible.

Another embodiment of the soundproofing device is shown in FIG. In this embodiment,
In the embodiment shown in FIG.
Shows a case where only a part of is covered. The end of the soundproof cover 1 and the outer frame 21 are joined by joining means such as adhesion, for example, and need not be particularly limited.

FIG. 7 shows a case where an opening is provided in a part of the soundproof cover 1.

6 and 7 is a part necessary for, for example, operation and maintenance of the mechanical device 30, and is not a part necessary to achieve a function as a soundproofing device. However, there is no particular limitation.

FIG. 8 shows the noise source 20 existing inside the mechanical device 30.
2 shows a case where a part or all of is covered by the soundproof cover 1.

In the above three embodiments, it is known that the same soundproof effect can be obtained by realizing the same operation as the embodiment shown in FIG.

The soundproof cover 1 or the soundproof member 10 in all the embodiments shown in FIGS. 2 to 5 is the same as the partial cover or the partially open soundproof cover 1 in the embodiment shown in FIG. 6 or FIG. The same applies to the shape.

In addition, the soundproof cover 1 or the soundproof member 10 in all the embodiments of the soundproofing device shown in FIGS. 2 to 5 is bag-shaped and seals the mechanical device 30 like the soundproofing cover 1 shown in FIG. It has been found that even in the case of covering as described above, the same soundproof effect as in the above-described embodiment can be obtained. still,
In particular, if the stopper 33 can seal the mechanical device 30,
There is no need to limit the size, shape and material.

In general, when the fan 23 is provided inside the mechanical device 30 for cooling and an opening 24 is provided in a part of the outer frame 21, noise leakage from the opening 24 and noise of the fan 23 itself become a problem. There are cases. In consideration of such a case, a cylindrical soundproof cover 13 is installed near the opening 24 as shown in FIG. For example, when the soundproof cover 13 attempts to deform in an out-of-plane direction due to the sound wave of noise leaking from the opening 24, the soundproof cover 13 is deformed in a direction opposite to the deformation direction by an appropriate control input 5 from the control device 3. To try. Thereby, the deformation of the soundproof cover 13 is suppressed to a small value, and the sound wave of the noise is attenuated during propagation in the soundproof cover 13, and the noise to the outside of the soundproof cover 13 is suppressed to a small value. The control device 3 is the same as that of the embodiment shown in FIG.

In the present embodiment, the soundproof cover 13 and the outer frame 21 are joined together by, for example, bonding means such as an adhesive. However, in some cases, the outer frame 21 or a suitable support member (not shown) outside the outer frame 21 may be used. ) May be supported by a suitable supporting method.

When the vibration of the outer frame 21 may affect the control of the soundproof cover 13, the outer frame 21 and the soundproof cover 21
For example, a vibration isolating member or the like may be provided between them.

Another embodiment of the soundproofing device is shown in FIG. In this embodiment,
Instead of the soundproof cover 13 in the embodiment shown in FIG.
This is a case where a soundproof member 14 as a covering member having one or a plurality of the driving units 2a and 2b is installed. In this embodiment, it is known that the same operation as the embodiment shown in FIG. 3 can be performed to obtain the same effect as the embodiment shown in FIG. Further, in the present embodiment, the driving units 2a, 2b
As shown in FIG. 11, the support member
The same applies to the case where 11a and 11b are provided.

Another embodiment of the soundproofing device is shown in FIG. In this embodiment,
FIG. 9 shows a case where the control device 3 (not shown) is included in the soundproof cover 13 in the embodiment shown in FIG. further,
In this embodiment, the accumulator (not shown) is provided inside the control device 3 as in the embodiment shown in FIG.

Another embodiment of the soundproofing device is shown in FIG. In this embodiment,
This is a case where a soundproof cover is provided inside the mechanical device 30 in the embodiment shown in FIG. In this embodiment, it is known that the same effect as that of the above embodiment can be obtained. The same applies to the case where a part of the soundproof cover 13 is outside the mechanical device 30 in the present embodiment.

The above is the description of the embodiment of the soundproofing device. Next, a vibration damping device according to another embodiment of the present invention will be described with reference to the drawings.

FIG. 14 is a diagram showing an embodiment of the vibration damping device. In the present embodiment, one or a plurality of driving units 2a and 2b are installed on the outer frame 21 of the mechanical device 30, and a closed loop feedback control system is configured by coupling with the control device 6. Next, the operation of this embodiment will be described. For example, noise source 20
When the outer frame 21 is going to be deformed in the out-of-plane direction by the sound wave of the noise generated from the controller, control is performed so that the portion of the outer frame 21 where the driving units 2a and 2b are installed is deformed in the opposite direction to the deformation direction. The control units 8a and 8b are provided as appropriate control signals from the device 6 to attempt to deform the driving units 2a and 2b. Or,
A force is applied to the outer frame 21 by the driving units 2a and 2b. This allows
Local deformation of the outer frame 21 is transmitted to the entire outer frame 21, and the operation of the outer frame 21 is suppressed similarly to the soundproof cover 1. As a result, the deformation of the outer frame 21 in the out-of-plane direction is reduced, and
Propagation of noise from the inside to the outside of the outer frame 21 is suppressed to be small.

If the above operation can be realized, the driving unit
The size and shape of 2a and 2b need not be particularly limited. Further, the control device 6 does not need to be particularly limited, and may have a configuration shown in FIG. 18, for example.

FIG. 15 shows another embodiment of the vibration damping device. This embodiment is the
In the above embodiment shown in FIG. 14, in order to deform the driving units 2a, 2b or to smoothly transmit the force from the driving units 2a, 2b to the outer frame 21, the support members 11a, 11b are connected to the driving units 2a, 2b. This is a case where it is provided between the frame 21. Also in the present embodiment, the fourteenth
It is known that the same effect as that of the above embodiment shown in the drawing can be obtained. The drive units 2a and 2b, the support members 11a and 11b,
There is no need to particularly limit the joining means between the outer frame 21 and 11a, 11b.

FIG. 16 shows another embodiment of the vibration damping device. In this embodiment, the outer frame 21 has a structure in which both surfaces of the soundproof cover 1 are sandwiched between outer frame members 26a and 26b and bonded together as shown in FIG. The control device 3 is included inside the soundproof cover 1 as in the embodiment shown in FIG.

The operation of this embodiment is basically the same as that of the embodiment shown in FIG. 5, and it is known that there is no need to change the control device 3 in particular, and the same effect can be obtained. Further, in the present embodiment, in the case of a structure in which the outer frame member 26 is bonded to only one side of the soundproof cover 1, or
The same applies to the case where the control device 3 is not included inside the soundproof cover 1 but exists independently outside. It is not necessary to particularly limit the method of bonding the outer frame member 26 and the soundproof cover 1.

 The above is the description of the embodiment of the vibration damping device.

The embodiments of the soundproofing device and the control device have been described above. The configuration of the driving unit 2 and the other embodiment of the control method, which are particularly important in the present invention, will be described in detail below.

The drive unit 2 includes, for example, an input terminal 34 as shown in FIG.
When a voltage is applied to the a and b, the piezoelectric element having the characteristic of being deformed in one direction, so that the driving unit 2 itself deforms in an out-of-plane direction as shown in FIG. 23 according to the voltage. A structure in which a plurality of pieces are appropriately bonded may be used. FIG. 23 is a side view from the direction of arrow A in FIG. Also,
As shown in FIG. 24, the driving unit 2 is particularly arranged in the radial direction (24th direction).
A structure in which a circular piezoelectric element having a characteristic of deforming in the direction of the arrow in the figure) may be appropriately bonded so that the driving unit 2 itself deforms in an out-of-plane direction. Further, as shown in FIG. 25, the driving unit 2 may have a structure in which a stacked piezoelectric element group 35 in which a plurality of piezoelectric elements are stacked and a load mass 36 are combined. Note that the laminated piezoelectric element group 35 has a feature of being deformed in the direction of the arrow in FIG. The drive unit 2 and the soundproof member 10
Alternatively, the outer frame 21 is joined as shown in FIG. In addition, the mass of the additional mass 36 is
It is an appropriate value in consideration of the displacement characteristics of the soundproof member and the rigidity of the soundproof member 10 or the outer frame 21 and the like.

Regarding the control of the drive unit 2 in the present embodiment, a closed loop feedback control system may be configured by coupling with the control device 37 shown in FIG. In FIG. 26, the control device 37 includes a signal amplifier 37a, a first circuit 37b, a second circuit 37c,
It comprises a gain adjuster 37d, a voltage amplifier 37e, and a third circuit 37f. The configurations of the first circuit 37b, the second circuit 37c, and the third circuit 37f are determined by the control method of the drive unit 2, respectively.

Hereinafter, the operation of the present embodiment will be described including the configurations of the first circuit 37b, the second circuit 37c, and the third circuit 37f.

As described above, since the soundproofing member 10 has a function of deforming into an arbitrary shape by applying an external force of metal, plastic, or the like, noise generated from the mechanical device 30 inside the soundproofing member 10 becomes a vibration source and becomes elastic. Causes vibration. This is the outer frame
The same applies to 21. For this reason, the spectrum of the acceleration at one point of the soundproof member 10 or the outer frame 21 is excellent at a plurality of frequencies as shown in FIG. 27, for example. Correspondingly, the sound pressure spectrum near the soundproof member 10 or the outer frame 21 is as shown in FIG. In order to reduce the sound pressure level outside the soundproofing member 10 or the outer frame 21, it is particularly effective to suppress sound at a predominant frequency, that is, vibration. In order to realize this, it is necessary to control the drive unit 2 to increase the attenuation of the soundproof member 10 or the outer frame 21 itself. Generally, an equivalent circuit of a piezoelectric element is an electrical temporary delay system composed of a resistor and a capacitor. For example, by making the detection signal an acceleration signal near the center of the drive unit 2 in FIG. 26, the drive unit 2 integrates the acceleration signal, that is, is proportional to the speed signal, To increase the control force. As a result, the vibration of the soundproof member 10 or the outer frame 21 is suppressed particularly at the predominant frequency as shown in FIG. 28, and the overall sound pressure level is accordingly reduced. However, when the detection signal is a displacement or speed signal, it is necessary to provide a plurality of integrators or differentiators in the first circuit 37b in FIG. 26 to realize the same operation as described above. It is also necessary to provide a plurality of adders in consideration of cases other than the above.

Human hearing is generally set to be from 20 Hz to 20,000 Hz, but even within this region there is a region where the hearing is reduced.
For this reason, it is known that by realizing the vibration control of the soundproof member 10 or the outer frame 21 only in the frequency region where the audibility is particularly remarkable, the control energy can be reduced, and the control performance is also improved. . This can be realized by providing, for example, a filter having the characteristics shown in FIG. 29 in the second circuit 37c in FIG. That is, it is possible to perform control by extracting only a signal in a frequency region where the audibility is particularly noticeable from the detection signal.

As described above, the piezoelectric element is generally an electrical first-order lag system, and the transfer function of the piezoelectric element is represented by gain characteristic 1 and phase characteristic 1 in FIG. This characteristic affects the control performance, and improvement of the characteristic is indispensable in the present embodiment. More specifically, the characteristics are improved by providing a simple circuit including a resistor and a capacitor in the third circuit 37f in FIG. In FIG. 29, gain characteristic 1 and phase characteristic 1 can be improved like gain characteristic 2 and phase characteristic 2, respectively. Note that this characteristic improvement is a case where the resonance frequency fn1 of the piezoelectric element is converted to a lower frequency fn2.

The first circuit 37b, the second circuit 37c, and the third circuit 37 in FIG.
Since f needs to be provided in accordance with the control method as described above, if there is no particular need, a closed loop feedback control system may be configured by the control device 3 shown in FIG.

The vibration damping / soundproofing device of the present invention is a combination of the two devices of the above-described soundproofing device or control device, for example, as shown in FIG. It is known that the function as a vibration damping / soundproofing device can be achieved. However, if a sufficient soundproofing effect can be obtained by installing either the soundproofing device or the vibration damping device, this is not a limitation, and a single installation may be used.

Further, the vibration damping and soundproofing device of the present invention includes, for example, a washing machine,
The present invention can also be applied to products such as wire dot printers and compressors, in particular, where noise reduction is desired, and it is possible to reduce noise of those products.

〔The invention's effect〕

According to the present invention, the soundproofing device is detected by a soundproofing cover formed by covering a mechanical device having a noise source therein and by stacking and bonding a plurality of piezoelectric sheets, and one of the plurality of piezoelectric sheets is detected. Control means for inputting a vibration signal, converting the signal and outputting a control signal for deforming the soundproof cover in a direction opposite to the vibration direction of the soundproof cover to another of the plurality of piezoelectric sheets. The soundproofing device can attenuate the vibration of the soundproofing cover, and has a soundproofing effect of reducing the noise of the mechanical device.

Also, a wrapping member that covers the mechanical device having a noise source therein, a piezoelectric sheet piece that is locally adhered to the wrapping member and a plurality of sheets are laminated and attached, Control means for inputting a signal of vibration detected by one of the plurality of piezoelectric sheet pieces, converting the signal, and applying the signal to another of the plurality of piezoelectric sheet pieces as a control signal for deforming the soundproof cover in a direction opposite to the vibration direction of the soundproof cover. Therefore, the soundproof device has a soundproof effect of attenuating the vibration of the soundproof cover and reducing noise.

Further, the soundproofing device is constituted by a wrapping member for covering a mechanical device having a noise source therein, a driving body having a spring attached to the wrapping member for suppressing vibration of the wrapping member, and a damping means. Therefore, there is a soundproof effect of attenuating the vibration of the soundproof cover and reducing noise.

Further, according to the present invention, a vibration damping device, a plurality of piezoelectric sheet pieces stuck on an outer frame of a mechanical device having a noise source therein and formed by laminating, and one of a plurality of piezoelectric sheets Control of inputting the vibration of the outer frame detected by the piece to the other piezoelectric sheet pieces as a control signal for transforming the signal and transforming the outer frame in a direction opposite to the vibration direction of the outer frame vibration Since the vibration control device is constituted by the means, the vibration of the outer frame can be attenuated by the vibration damping device, and there is a soundproof effect of reducing noise of the mechanical equipment value.

Further, according to the present invention, since the vibration damping / sound proofing device is configured by combining the above sound proofing means and the vibration damping means, the vibration generated in the outer frame by the sound wave from the noise source during the operation of the mechanical device is damped. The sound wave suppressed by the device and further transmitted from the outer frame is attenuated by the soundproofing device, so that further soundproofing can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a basic configuration diagram of a vibration damping / soundproofing device of the present invention, FIG. 2 is a diagram showing a soundproofing device including a soundproofing cover and its control device, and FIGS. FIG. 5 is a view showing a soundproofing device including a soundproofing member, a driving unit and a control device thereof, FIG. 5 is a view showing a soundproofing device including the control device inside the soundproofing cover, and FIG. 6 is a soundproofing cover covering a part of the mechanical device. FIG. 7 is a diagram showing a soundproof device having a soundproof cover with a part opened, FIG. 8 is a diagram showing a soundproof device having a soundproof cover installed inside an outer frame of a mechanical device, FIG. FIG. 12 to FIG. 12 show a soundproofing device provided with a cylindrical soundproofing cover, FIG. 13 shows a soundproofing device provided with a soundproofing cover inside a mechanical device, FIG.
FIGS. 16 to 16 show an embodiment of the vibration damping device, FIG. 17 is a cross-sectional view showing the configuration of the outer frame, FIG. 18 is a block diagram showing the configuration of the control device, and FIG. 19 is the configuration of the soundproof cover. FIG. 20, FIG. 20 is a configuration diagram of a drive unit, FIG. 21 is a diagram showing a bag-shaped soundproof cover, FIG.
FIG. 23 is a configuration diagram of the driving unit, FIG. 23 is a side view showing a deformation of the driving unit, FIG. 24 is a diagram showing a circular piezoelectric element, FIG. 25 is a configuration diagram of the driving unit, FIG. Block diagram showing the configuration,
27 and 28 are diagrams showing frequency response, respectively, FIG. 29 is a diagram showing characteristics of a filter, and FIG. 30 is a diagram showing characteristics of a piezoelectric element. 1,13… Soundproof cover, 2… Drive unit, 3,6… Control device, 4,7 …… Detection signal, 5,8… Control input, 10,14 …… Soundproof member (wrapping member) , 11 support member, 31 piezoelectric film group (piezoelectric sheet), 32 piezoelectric element group (piezoelectric sheet piece), 34 input terminal, 35 laminated piezoelectric element group, 36 additional mass, 37 ... Control device, 38 ... Piezoelectric element.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tosuke Hirata 502 Kandate-cho, Tsuchiura-city, Ibaraki Pref. Inside Hitachi, Ltd.Mechanical Laboratory Co., Ltd. Hitachi Machinery Laboratory (72) Inventor Isao Hayase 502 Kandatecho, Tsuchiura-shi, Ibaraki Prefecture Hitachi Machinery Research Laboratory, Inc. (72) Inventor Taichi Sato 502-Kindachicho, Tsuchiura-city, Ibaraki Prefecture, Hitachi, Ltd. 72) Inventor Shuji Onodera 502, Kandachi-cho, Tsuchiura-shi, Ibaraki Pref. Hitachi Machinery Co., Ltd. (56) References JP-A-63-170699 (JP, A) JP-A-59-187132 (JP, A) JP-A-61-286634 (JP, A) JP-A-63-293342 (JP, A)

Claims (6)

(57) [Claims] 1. A soundproofing device comprising: a soundproofing cover that covers a mechanical device having a noise source therein and is formed by laminating and attaching a plurality of piezoelectric sheets; and a controller for controlling the soundproofing cover. One of the piezoelectric sheets detects the vibration of the soundproof cover and outputs a detection signal, and the control device inputs the detection signal and outputs a control signal for suppressing the vibration of the soundproof cover to the plurality of sheets. A soundproofing device for outputting to another of the piezoelectric sheets. 2. A driving means comprising a wrapping member covering a mechanical device having a noise source therein, and a plurality of piezoelectric sheet pieces locally adhered to the wrapping member, and a driving means comprising: And a control device for controlling the vibration control device, wherein one of the plurality of piezoelectric sheet pieces detects a vibration of the wrapping member and outputs a detection signal, and the control device performs the detection. A soundproofing device which outputs a control signal for suppressing vibration of the wrapping member from a signal to another of the plurality of piezoelectric sheet pieces. 3. The soundproofing device according to claim 1, wherein an elastic vibration isolating means is interposed between the mechanical device and the soundproofing cover. 4. The soundproofing device according to claim 2, wherein an elastic vibration isolating means is interposed between the mechanical device and the covering member. 5. A vibration damping device comprising a driving means in which a plurality of piezoelectric sheet pieces bonded to an outer frame of a mechanical device having a noise source therein are superposed and bonded, and a control means for the driving means. Wherein one of the plurality of piezoelectric sheet pieces detects the vibration of the outer frame and outputs a detection signal, and the control means inputs the detection signal to suppress the vibration of the outer frame. A vibration control device for outputting a control signal to be output to another of the plurality of piezoelectric sheet pieces. 6. A vibration damping / soundproofing device comprising a combination of the soundproofing device according to claim 1 and the vibration damping device according to claim 5.