JP2015203469A - Vibration suppression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration suppression device which directly controls vibrations of a suppression object.SOLUTION: A vibration suppression device 10 includes: a par of rigid members 14A, 14B which are fixed to a vibration suppression object 12 at one end; and plate-like piezoelectric members 16 which are provided in an area between the other ends of the rigid members 14A, 14B.

Description

  The present invention relates to a vibration suppressing device.

When a plate-like member is arranged between a noise source and a space where noise is desired to be reduced, there is a method of suppressing vibration at the position of the plate-like member as one of the noise reduction means. Specifically, a method of increasing the mass of the plate member to make it difficult for vibration from the noise source to be transmitted to the plate member, or vibration transmitted from the noise source to the plate member by controlling the plate member. A method of suppressing this is conceivable.
Since general plate-like members in living spaces have a wide variety of materials and shapes, they can be applied to a wide range of plate-like members, and a technique for effectively suppressing vibration is required.

As a technique for reducing the vibration of the plate-like member, for example, there is Patent Document 1.
Patent document 1 is a structure which attaches a piezoelectric speaker to the noise source side of the plate-shaped member as a vibration suppression object, and makes a piezoelectric speaker function as an acoustic-electrical converter or a vibration-electrical converter. As a result, the acoustic energy or vibration energy transmitted from the noise source to the plate-like member is converted to electric energy before being transmitted to the plate-like member, and the electric energy is consumed by the consuming means, so that the acoustic energy or vibration is consumed. Energy is reduced.

JP 2005-10270 A

  However, Patent Document 1 cannot suppress the vibration of a vibration suppression object that has already been vibrated because vibration is transmitted from a noise source.

  An object of this invention is to provide the vibration suppression apparatus which controls directly the vibration of a vibration suppression target object in view of the said fact.

  The vibration suppression apparatus according to the first aspect of the present invention includes a pair of rigid members whose one ends are fixed to a vibration suppression object, and a plate-like piezoelectric member provided between the other ends of the rigid members. It is characterized by that.

According to the first aspect of the present invention, by applying a voltage to the piezoelectric member, the piezoelectric member provided between the other ends of the pair of rigid members expands and contracts. At this time, since one end of the rigid member is fixed to the vibration suppression object, the other end of the rigid member approaches and separates from each other to incline the rigid member.
As a result, the vibration suppression target object can be vibrated by repeatedly applying a moment having one end side of the rigid member as a fulcrum to the vibration suppression target object by the piezoelectric member. At this time, the vibration of the vibration suppression target object can be suppressed by giving the vibration suppression target object the vibration having the opposite phase to the vibration due to the noise of the vibration suppression target object.

  According to a second aspect of the present invention, in the vibration suppressing device according to the first aspect, the piezoelectric member is affixed to a flexible plate material spanned between the other ends of the rigid member. It is said.

According to the second aspect of the present invention, the other end of the rigid member is brought closer to and away from each other via the plate member by the expansion and contraction of the piezoelectric member attached to the plate member, and the rigid member is inclined.
Thereby, even if the piezoelectric member has a thin film structure, the force generated by the expansion and contraction of the piezoelectric member can be stably transmitted to the rigid member through the plate material.

  According to a third aspect of the present invention, in the vibration suppressing device according to the second aspect, the rigid member is partially formed in a frame shape by providing a cut, the interior of the rigid member is surrounded by the plate material, The piezoelectric member is characterized in that the plate member is vibrated so as to cancel the vibration of the object to be suppressed by the variation in the volume of the space surrounded by the plate member.

According to the third aspect of the present invention, a closed space can be formed between the vibration suppression object and the plate member by forming the rigid member in a frame shape. The volume of the closed space is changed by the piezoelectric member provided on the plate material, and the vibration of the vibration suppression object is canceled.
Thereby, the vibration of the vibration suppression object can be suppressed more effectively.

  Since this invention is set as the said structure, the vibration suppression apparatus which controls directly the vibration of a suppression target object can be provided.

(A) is a side view which shows the basic composition of the vibration suppression apparatus which concerns on 1st Embodiment of this invention, (B) (C) is a side view for demonstrating all the effect | actions of a vibration suppression apparatus. . (A) is a front view which shows the basic composition of the vibration suppression apparatus which concerns on 1st Embodiment of this invention, (B) is a front view which shows the development example of a vibration suppression apparatus. It is sectional drawing which shows the application example of the vibration suppression apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the other application example of the vibration suppression apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the other application example of the vibration suppression apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the other application example of the vibration suppression apparatus which concerns on 1st Embodiment of this invention. (A) is a side view which shows the basic composition of the vibration suppression apparatus which concerns on 2nd Embodiment of this invention, (B) is a side view which shows the development example of a vibration suppression apparatus. It is sectional drawing which shows the basic composition of the vibration suppression apparatus which concerns on 3rd Embodiment of this invention.

(First embodiment)
The vibration suppression device 10 according to the first embodiment of the present invention will be described with reference to FIGS. As shown in the side view of FIG. 1 (A) and the front view of FIG. 2 (A), the vibration suppressing device 10 is fixed to a control flat plate 12 that is a vibration suppressing object, a pair of legs (rigid members). 14A and 14B.

As will be described later, the control flat plate 12 is a wall disposed between a space 20 where noise is desired to be reduced and a space 22 on the noise generation side, and a part of the continuous wall is cut out and described. .
The vibration suppressing device 10 is fixed to the surface of the control flat plate 12 on the space 22 side by legs 14A and 14B. The leg portions 14A and 14B are arranged to face each other with a predetermined distance L, one end is fixed to the control flat plate 12, and the core member 18 is attached to the other end.

The leg portions 14A and 14B are made of a highly rigid material such as a steel material, and are configured not to be deformed even when the core member 18 expands and contracts to generate a bending moment.
The core member 18 is a flexible plate member having a width W in the X-axis direction and spanned between the leg portions 14A and 14B. The core member 18 has a function of reinforcing the film type piezoelectric element 16, and expands and contracts integrally with the film type piezoelectric element 16 due to expansion and contraction of the film type piezoelectric element 16.

  A plurality of film-type piezoelectric elements (piezoelectric members) 16 are attached to the surface of the core material 18 in the Y-axis direction. A total of three film-type piezoelectric elements 16 are attached, with two extending at both ends and one at the center with the expansion and contraction direction in the Y1 direction. Thereby, the core material 18 can be expanded and contracted in the Y-axis direction by the film-type piezoelectric element 16.

Although the illustration of the internal structure of the film-type piezoelectric element 16 is omitted, a polyimide film having electrodes printed on both sides of a fiber-shaped piezoelectric ceramic formed into a film shape is bonded with an epoxy resin. When a voltage is applied from the controller 36 via the lead wires 76 attached to both sides of the piezoelectric ceramic, the film-type piezoelectric element 16 is distorted according to the applied voltage value in the piezoelectric ceramic. The piezoelectric element 16 can be deformed.
That is, if a voltage is applied to the film-type piezoelectric element 16, the film-type piezoelectric element 16 can be expanded and contracted in the direction of the arrow Y1 according to the applied voltage.

Here, a control system for controlling the film-type piezoelectric element 16 will be described.
As shown in FIG. 2A, a sensor 38 for detecting the vibration of the control flat plate 12 is attached to the control flat plate 12. In the present embodiment, a configuration is shown in which two vibration suppression devices 10 are arranged in parallel in the Y-axis direction.

The detection result of the sensor 38 is input to the controller 36. The controller 36 generates a control signal for reducing the vibration of the control flat plate 12 and outputs the control signal to each of the film-type piezoelectric elements 16 of the two vibration suppression devices 10. The film-type piezoelectric element 16 expands and contracts based on the control signal, and deforms the control flat plate 12 in the directions of R1 and R2 indicated by broken lines in FIG.
Although the position of the sensor 38 is the surface of the control flat plate 12, it is not limited to this, and when the vibration of the control flat plate 12 can be detected at the position of the core member 18, the sensor 38 is attached to the core member 18. Also good.

Next, the operation will be described.
As shown in FIG. 1B, when a voltage is applied from the controller 36 and the film-type piezoelectric element 16 is contracted in the direction of the arrow S, the core member 18 is contracted toward the center. Thereby, the edge part side by the side of the core 18 of leg part 14A, 14B approaches mutually, and leg part 14A, 14B is inclined.

  At this time, the leg portions 14A and 14B are tilted around the joint portions PA and PB with the control flat plate 12, and moments M1 and M2 around the joint portions PA and PB are generated. The leg portions 14 </ b> A and 14 </ b> B have rigidity to transmit the moments M <b> 1 and M <b> 2, the moments M <b> 1 and M <b> 2 are transmitted to the control flat plate 12, and the control flat plate 12 is deformed into a convex shape toward the space 20.

  Further, as shown in FIG. 1C, when a voltage is applied from the controller 36 and the film type piezoelectric element 16 is expanded in the direction of the arrow L, the core member 18 is expanded. Thereby, the edge parts by the side of the core 18 of leg part 14A, 14B are mutually spaced apart, and leg part 14A, 14B is inclined.

  At this time, the leg portions 14A and 14B are tilted around the joint portions PA and PB with the control flat plate 12, and moments M3 and M4 around the joint portions PA and PB are generated. The leg portions 14A and 14B have rigidity to transmit the moments M3 and M4, the moments M3 and M4 are transmitted to the control flat plate 12, and the control flat plate 12 is deformed into a concave shape in the direction of the space 20.

  By repeatedly compressing and expanding with the film-type piezoelectric element 16, the film-type piezoelectric element 16 repeatedly applies a moment about one end side of the leg portions 14A and 14B to the control flat plate 12, and the control flat plate 12 is convex. It vibrates by repeating the shape and the concave shape.

  As described above, according to the present embodiment, the control flat plate 12 is vibrated by the film-type piezoelectric element 16 so that the control flat plate 12 vibrates with vibration having a phase opposite to that of the noise from the space 22. Thereby, the vibration of the control flat plate 12 is suppressed and noise can be reduced.

  In the present embodiment, two vibration suppression devices 10 are arranged in the Y direction of the control flat plate 12, and the control flat plate 12 is deformed in the Y direction to suppress vibration. However, the present invention is not limited to this, and the number of vibration suppression devices 10 is determined based on the vibration strength of the control flat plate 12, the degree of required vibration suppression, etc., and may be one or three or more. good.

  Moreover, in this embodiment, the film type piezoelectric element 16 was described as an example in which two in total, one at the both ends and one at the center, with the expansion / contraction direction in the Y1 direction. However, the present invention is not limited to this, and the quantity and mounting position of the film-type piezoelectric element 16 are determined based on the vibration strength of the control plate 12, the degree of vibration suppression requirements, and the like. Three or more may be sufficient, and the attachment position may not be both ends or a center part.

  In this embodiment, the case where the vibration suppression device 10 is arranged in the Y direction of the control flat plate 12 has been described. However, the present invention is not limited to this, and as shown in FIG. 2B, the installation direction of the vibration suppression device 10 is determined by the direction of vibration to be suppressed, and both the X direction and the Y direction are determined. May be arranged in the X direction or only in the X direction.

  Moreover, the vibration suppression apparatus 10 was demonstrated by the structure arrange | positioned at the space 22 side of the control flat plate 12. FIG. However, the present invention is not limited to this. When it is difficult to install the vibration suppression unit 24 on the space 22 side, the vibration suppression unit 24 is disposed on the space 20 side of the control plate 12 to suppress the vibration of the control plate 12. Also good.

Next, a specific application example of the present embodiment will be described with reference to FIGS.
In addition, the following application examples are examples, and this embodiment is not limited to these.

First, an application example to the ceiling board 28 will be described.
As shown in FIG. 3, the ceiling board 28 is supported and suspended by a support member 30 and a brace 32 from a floor slab 26 of the building. The vibration suppressing device 10 is attached to the ceiling board 28. The description of the control device is omitted.
The vibration suppression device 10 is disposed in a ceiling space 78 between the indoor space 52 where noise is desired to be reduced and the noise space 54 on the noise source side. The vibration suppression device 10 is fixed to the upper surface of the ceiling board 28 by the leg portions 14A and 14B.

Accordingly, as described above, by extending and contracting the film-type piezoelectric element 16, the ceiling plate 28 can be repeatedly deformed into a convex shape and a concave shape and vibrated.
As a result, for example, even if the ceiling board 28 is vibrated in the direction of the arrow 34 due to vibration transmitted through the floor slab 26, the vibration suppression device 10 applies vibration having a phase opposite to that of the ceiling board 28. The noise transmitted through 28 can be reduced.

  FIG. 3 shows a configuration in which the vibration suppression device 10 is attached to only one place on the ceiling plate 28, but the present invention is not limited to this, and the vibration suppression device 10 has a necessary number of ceiling plates. 28 may be attached. In addition, with this configuration, vibration can be effectively suppressed against vertical movement of the ceiling plate 28 that occurs during an earthquake.

Next, an example of application to the sound insulation wall 50 of an expressway will be described.
As shown in FIG. 4, the sound insulation wall 50 of the expressway is arranged in the vertical direction between the roadway side space 46 and the noise reduction side space 48.
The sound insulating wall 50 has a front plate 40 facing the roadway side space 46 and formed with a louver. A sound absorbing material 42 that absorbs noise is attached to the back surface of the front plate 40 with a predetermined thickness. A back plate 44 made of a steel plate is provided on the back surface side (noise reduction side space 48 side) of the sound absorbing material 42.

The vibration suppression device 10 is disposed inside the sound insulation wall 50 of the highway and is disposed between the sound absorbing material 42 and the back plate 44.
The vibration suppression device 10 is fixed to the back plate 44 with legs 14A and 14B, and expands and contracts the film-type piezoelectric element 16, thereby vibrating the back plate 44 by repeatedly deforming the convex shape and the concave shape. Specifically, the vibration transmitted through the sound absorbing material 42 is detected by a sensor 38 (not shown), and a control vibration having a phase opposite to that of the vibration transmitted by the controller 36 (not shown) is generated. The back plate 44 is deformed to suppress the vibration of the back plate 44.
Thereby, the noise which permeate | transmits the sound insulation wall 50 can be reduced.

Next, an application example to the sound insulation window 56 will be described.
As shown in FIG. 5, a window sash provided with a multi-layer glass is fitted in the sound insulation window 56. A window glass 58 is provided in the space 62 on the noise source side, and a window glass 60 is provided on the indoor side to reduce noise. The vibration suppression device 10 is disposed between the window glass 58 and the window glass 60, and is fixed to the window glass 60 with legs 14A and 14B.

With this configuration, the vibration of the window glass 58 that is transmitted from the noise source 62 and vibrates in the direction of the arrow 68 is detected by the sensor 38 (not shown), and the vibration that cancels the vibration transmitted to the window glass 60 is illustrated. Can be generated by the controller 36. The vibration of the window glass 60 is suppressed by expanding and contracting the membrane-type piezoelectric element 16 and expanding and contracting the core member 24 by the output from the controller 36. Thereby, the vibration of the window glass 60 can be suppressed by the vibration suppressing device 10. As a result, the noise passing through the sound insulation window 56 can be reduced.
When combined with a latticed multi-layer glass, the connecting means and the aluminum lattice can be combined.

Next, an application example to the air conditioning duct 70 will be described.
As shown in FIG. 6, the vibration suppression device 10 is attached to the opposite side wall 70 </ b> A of the air conditioning duct 70 so as to face each other.

The vibration suppression device 10 is disposed in the internal space 72 of the air conditioning duct 70, and is attached to the surface of the side wall 70A facing the space 74 for suppressing vibration by legs 14A and 14B. Thereby, the vibration of the side wall 70A to which the vibration is transmitted by the air for air conditioning passing through the internal space 72 is detected by the sensor 38 (not shown), and the vibration to cancel the vibration transmitted to the side wall 70A is generated by the controller 36 (not shown). can do. The vibration of the side wall 70A can be controlled by expanding and contracting the membrane type piezoelectric element 16 and expanding and contracting the core member 24 by the output from the controller 36. As a result, noise transmitted to the outside of the air conditioning duct 70 can be reduced.

In addition, what is necessary is just to attach the vibration suppression apparatus 10 to the side wall 70B, when suppressing the vibration of the side wall 70B of the duct 70 for air conditioning.
Moreover, although illustration is abbreviate | omitted, the vibration suppression apparatus 10 can be attached to the body of an installation equipment, and the vibration of the body of an installation equipment can also be suppressed.

(Second Embodiment)
A vibration suppressing device 80 according to a second embodiment of the present invention will be described with reference to FIG.
The vibration suppressing device 80 is different from the first embodiment in that a film-type piezoelectric element (piezoelectric member) 82 is bridged between the other ends of the leg portions 14A and 14B. The difference will be mainly described.

As shown in FIG. 7A, the film-type piezoelectric element 82 is bridged between the other ends of the leg portions 14A and 14B without using a core material. Thereby, by extending and contracting the film-type piezoelectric element 82, the other ends of the leg portions 14A and 14B can be brought closer to and away from each other, and the leg portions 14A and 14B can be inclined.
As a result, the control flat plate 12 can be deformed by the force generated by the expansion and contraction of the film-type piezoelectric element 82, and noise can be suppressed.

As shown in FIG. 7B, the spring 84 may be passed between the leg portions 14A and 14B, and the spring P may apply a separation force P between the leg portions 14A and 14B. Thereby, the film-type piezoelectric element 82 can be made to act only on contraction.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Third embodiment)
A vibration suppressing device 90 according to a third embodiment of the present invention will be described with reference to FIG.
The vibration suppressing device 90 is different from the first embodiment in that the leg portion 88 is partially cut to form a frame shape. The difference will be mainly described.

As shown in the cross-sectional view of FIG. 8, the vibration suppressing device 90 has a leg portion 88 formed in a frame shape. The leg 88 is partially provided with a cut, and is allowed to be deformed along with expansion and contraction of the film-type piezoelectric element 16. An internal space 86 surrounded by the legs 88 is covered with the core material 18, and the film-type piezoelectric element 16 is attached to the core material 18.
That is, the space 86 is not closed but is closed because the leg 88 is partially cut and formed into a frame shape.

  With this configuration, when the film-type piezoelectric element 16 is expanded and contracted in the direction of the arrow Y1, as described above, the opposing legs 88 are inclined, and the control flat plate 12 is moved in the directions indicated by the broken lines R1 and R2. Can be deformed. At this time, the core member 18 is also deformed and vibrates in the directions indicated by the broken lines R3 and R4.

  Thereby, the vibration of the control plate 12 can be suppressed by causing the change in the air volume of the space 86 to act in the direction indicated by the arrow 94, for example, at the timing of canceling the vibration of the control plate 12. That is, the vibration of the control flat plate 12 can be effectively suppressed by causing the variation of the air volume of the space 86 in addition to the deformation due to the inclination of the leg portion 88.

In the present embodiment, the leg portion 88 is partially cut to form a frame shape, and the inclination of the leg portion 88 due to the expansion and contraction of the film type piezoelectric element 16 is ensured. However, the present invention is not limited to this, and the cut may be closed with an elastic sealing material or the like. By ensuring the inclination of the leg portion 88 and sealing the space 86, the variation in the volume of the space 86 that causes the vibration of the control flat plate 12 to be canceled can be further strengthened.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

10, 80, 90 Vibration suppression device 12 Control plate (vibration suppression object)
14A, 14B Leg (Rigid member)
16, 17, 82 Film type piezoelectric element (piezoelectric member)
18 Core material (plate material)
88 Leg (Rigid member)

Claims (3)

A pair of rigid members, one end of which is fixed to the vibration suppressing object;
A plate-like piezoelectric member provided between the other ends of the rigid member;
A vibration suppressing device.   The vibration suppressing device according to claim 1, wherein the piezoelectric member is attached to a flexible plate member that is stretched between the other ends of the rigid member. The rigid member is partially cut to form a frame, and the rigid member is surrounded by the plate material,
The vibration suppression device according to claim 2, wherein the piezoelectric member vibrates the plate member so as to cancel the vibration of the vibration suppression target object by a change in a volume of a space surrounded by the plate member.

Images