JP6959855B2 - Active damping device and its active damping structure - Google Patents

Description

The present invention relates to, for example, an active vibration damping device for reducing vertical vibration of a floor in an office or the like and an active vibration damping structure thereof.

Conventionally, an active vibration damping device is composed of a movable mass and a linear actuator that forcibly vibrates the movable mass. For example, as described in Patent Document 1, an actuator device is placed between the interior floor plate and the floor support member, and vibration generated from a trolley or underfloor equipment is transmitted to the interior floor plate via the structural floor and the floor support member. When transmitted, the vibration transmitted from the trolley or underfloor equipment to the interior floor plate can be efficiently reduced by generating an exciting force of the actuator device so as to be in the opposite phase to the vibration to cancel the vibration. The active vibration damping device is known.

Japanese Unexamined Patent Publication No. 2008-95905 Japanese Unexamined Patent Publication No. 2008-190617

However, in the conventional active vibration damping device, the size of the entire vibration damping device becomes large because the linear actuator itself constituting the device is large. For example, in the vibration damping structure by the active vibration damping device described in Patent Document 2, there is no problem in installing the vibration damping device under the floor slab, but it is necessary to open the ceiling member at the time of maintenance. , It takes time and effort to perform inspection work because it is a high-place work. Further, there is a problem that it is difficult to install in a narrow space of about 10 cm to 15 cm such as under an interior floor board (OA floor) in an office building. The active vibration damping device and the vibration damping structure thereof according to the present invention have been proposed to solve such a problem.

The gist for solving the above-mentioned problems of the active vibration damping device according to the present invention and achieving the object is provided in a narrow space between a floor slab and an interior floor plate supported by a support member on the floor slab. A piezo actuator fixedly mounted on a mounting plate provided on the floor slab, a movable mass supported by the piezo actuator, and electricity to control the excitation frequency of the piezo actuator. The active is characterized by having at least a control device to be specifically connected and an anti-rotation member for preventing rotation of the movable mass arranged on the above-mentioned mounting plate in close proximity to the piezo actuator. It provides a vibration damping device.

The gist for solving the above-mentioned problems of the active vibration damping structure according to the present invention and achieving the object is a piezo actuator fixedly mounted on a mounting plate of a floor slab and a movable piezo actuator supported by the piezo actuator. between the masses, at least it has an active vibration damping device comprising a control device electrically connected to control the vibration frequency of the piezoelectric actuator, the support interiors floor in the support member to the floor slab of the space portion, wherein the piezoelectric actuator is fixed on the mounting plate of the floor slab, it was arranged with a gap between the lower surface of the interior floor and the upper surface of the movable mass, the active An active vibration damping structure characterized in that a rotation prevention member for preventing rotation of the movable mass is arranged on a mounting plate in close proximity to one to a plurality of the piezo actuators in the vibration damping device. It is to provide.

Further, as an additional requirement, the movable mass has a weight of 50 kg to 100 kg, and one or ^{two active vibration damping devices are arranged per 100 m 2 of the floor area of the interior floor board.} It's a waste.

According to the active vibration damping device of the present invention and its vibration damping structure, if a mass damper is vibrated by a mechanically amplified piezo actuator instead of a linear actuator, the displacement in the horizontal direction is amplified in the vertical direction. By displacementing, the height of the piezo actuator in the vertical direction as a device is lowered, and the size is reduced. By attaching a movable mass to this piezo actuator, for example, it can be installed in a narrow space between an interior floor plate, which is an interior floor plate, and a floor slab with a margin, and the degree of freedom of installation is increased.

In addition, the interior floor board can be easily removed for maintenance of the active vibration damping device. Further, since the active vibration damping device is installed on the floor slab, the work is not performed at a high place, and the safety of the operator is ensured, which is an excellent effect.

It is a schematic perspective view which shows the use state of the active vibration damping device which concerns on Example 1 of this invention. It is a side sectional view which shows the use state of the active vibration damping device which concerns on the same Example. It is a cross-sectional view which shows the vibration mode of the piezo actuator in the active vibration damping device which concerns on the same Example, (A) is a cross-sectional view which shows the state before vibration, and (B) is vibration by applying a voltage by a control device. It is a cross-sectional view when it is made. It is a side cross-sectional view which showed by breaking a part which shows the use state of the active vibration damping device which concerns on Example 2 of this invention. It is explanatory drawing which schematically showed the mechanism for preventing the displacement in the horizontal direction of the movable mass (weight) of the active vibration damping device which concerns on embodiment of this invention. It is a characteristic curve diagram which shows the result of the verification experiment by the acceleration sensor at the time of active vibration damping by the active vibration damping device 1 when there was vertical vibration.

As shown in the figure, the active vibration damping device 1 according to the present invention can be installed even in a narrow space 8 by miniaturizing the structure of the entire active vibration damping device by using a piezo (PZT, the same applies hereinafter) actuator 2. A plurality of examples will be illustrated and described below.

The configuration of the active vibration damping device 1 according to the first embodiment and the active vibration damping structure using the active vibration damping device 1 will be described with reference to FIGS. 1 to 3. The active vibration damping device 1 is provided in a narrow space 8 between the floor slab 6 and the interior floor plate 7 supported by the floor slab 6 with a support member 7a (a gate-shaped ready-made product made of synthetic resin or the like). It is a thing.

A piezo actuator 2 having a required thickness (1 to 2 cm) and a width of a mounting plate 10 fixed to the floor slab 6 by adhesive means or bolting, and fixed on the mounting plate 10, and the piezo actuator. A movable mass (weight) 3 supported by 2 and a control device (not shown) electrically connected to control the excitation frequency of the piezo actuator 2 are electrically connected to the control device. It has at least an application power source (not shown) for driving the piezo element 2b of the piezo actuator 2 and a drive driver (not shown) connected to the piezo element 2b and the control device.

In addition, an acceleration sensor 4 for measuring the vibration of a vibrating object such as a floor slab 6 is provided, and when the movable mass 3 is vibrated, the displacement given to the actuator 2 is measured and controlled by the displacement meter 5. Alternatively, it is measured and controlled by a strain gauge inside the piezo actuator, and both are electrically connected to the control device.

As shown in FIG. 3A, the piezo actuator 2 is provided with a plurality of laminated piezo elements 2b at the center of a base 2a of a rigid metal body, and is designated by a power supply unit in the illustrated state. When applied with a voltage, the piezo element 2b is displaced in the lateral direction (horizontal direction) in the arrow a direction.

As shown in FIG. 3B, the piezo element 2b extends in the lateral direction (horizontal direction), so that the base 2a is pulled in the lateral direction, and as a result, the output unit 2c is supported and obliquely. The inclined bridge portion 2d is displaced so as to be horizontal, and the displacement of the piezo element 2b is mechanically amplified and displaced in the direction indicated by the arrow b to the outside (vertical direction) of the output portion 2c.

The piezo actuator 2 has a vibration frequency of 5 to 30 Hz and sufficiently covers the frequency (15 to 20 Hz) that a person perceives. The height of the piezo actuator 2 is, for example, about 3 to 5 cm. Further, the piezo actuator 2 is fixed to the mounting plate 10 by, for example, a bolt or the like.

As shown in FIG. 1, the movable mass (weight) 3 is a substantially rectangular rigid metal body, and as an example, the movable mass (weight) 3 weighs about 50 to 150 kg. The movable mass 3 is fixed on the bases 2a of the plurality of piezo actuators 2 via bolts or the like.

The height (thickness) of the movable mass 3 is, for example, about 3 to 5 cm. Therefore, since the total minimum height of the above-mentioned mounting plate 10, the piezo actuator 2, and the movable mass 3 is 7 cm, and the total maximum height is 12 cm, the height of the space portion 8 is 10 to 10. As shown in FIG. 2, it can be installed with a margin even in a narrow space of about 15 cm.

The acceleration sensor 4 uses an appropriate commercially available product, and the displacement meter 5 can also use an appropriate commercially available product, but preferably, when the movable mass 3 is vibrated, the piezo actuator 2 is used. The displacement to be given can be measured and controlled by the strain gauge inside the piezo actuator 2.

As shown in FIG. 4, the active vibration damping device 1 according to the second embodiment has a required depth (about 1 to 1.5 cm) at the interference portion between the piezo actuator 2 and the movable mass 3 in order to make the whole thin. In some cases, a punched portion (recessed portion) 11 is formed.

The hollowed-out portion 11 is formed by mechanically hollowing out the inside of the movable mass 3 while leaving a peripheral edge portion 12 having a required height on the lower surface side of the movable mass 3, or using a thin movable mass 3 in advance. A metal plate-shaped member having a required width is placed along each outer peripheral side surface of the movable mass 3, and a part of the plate-shaped member is positioned so as to protrude from the lower surface side of the movable mass 3, for example, by welding or bolting. It can also be attached. In short, by projecting the plate-shaped member so as to surround the lower surface side of the movable mass 3, the entire lower surface of the movable mass 3 becomes a recessed portion (equivalent to a hollowed-out portion) having a required depth. No punching work is required.

Further, when there is concern about the rotational movement of the movable mass 3, a linear bush (guide mechanism) 13 for suppressing the rotational movement is provided at the position of the center of gravity of the movable mass 3, and a ring shape provided on the mounting plate 10. As an additional requirement, a means (mechanism) for always maintaining an appropriate position with the guide member 14 of the above is included.

The active vibration damping structure using the active vibration damping device 1 according to the present invention has the following structure. As shown in FIGS. 1 to 4, the active vibration damping device 1 is provided in a space 8 between the floor slab 6 and an interior floor plate 7 supported by the floor slab 6 with a support member 7a. Is fixed on the mounting plate 10 provided on the floor slab 6. The number of the piezo actuators 2 installed may be one, but preferably a plurality, for example, at least two, or three to at most four when supporting at three points.

Further, since the piezo actuator 2 and the movable mass 3 of the active vibration damping device 1 are placed on the mounting plate 10 provided on the floor slab 6, the work is not performed at a high place and the safety of the workers is ensured, and the construction work is carried out. Is quick and easy, and maintenance is also easy. Then, a miniaturized active vibration damping device 1 is arranged with a required gap between the upper surface of the movable mass 3 and the lower surface of the interior floor plate 7.

An anti-rotation member made of metal or synthetic resin is appropriately arranged on the mounting plate 10 in order to prevent the movable mass 3 from rotating in close proximity to the plurality of piezo actuators 2 in the active vibration damping device 1. be able to. Further, an acceleration sensor 4, a displacement meter 5, and a control device electrically connected to these are also arranged.

The active vibration damping device 1 is not particularly limited, but is arranged in, for example, about 1 to 2 units per ^{100 m 2 of the floor area of the interior floor plate 7.}

With such an active vibration damping structure, when mechanical vertical vibration, vertical vibration due to walking, or vertical vibration of an automobile or the like transmitted from the road is transmitted to the floor slab 6, the acceleration sensor 4 transmits the vertical vibration of the floor slab 6. A voltage is applied to the piezo actuator 2 to forcibly vibrate the movable mass 3 so as to cancel the vertical vibration. The displacement given to the piezo actuator 2 is movable while being controlled by a control device by measuring the displacement of the movable mass 3 with the displacement meter 5, or preferably with a strain meter provided inside the piezo actuator 2. Shake the mass 3.

When controlled in this way, as shown in FIG. 6, the amplitude of the response acceleration is reduced to about half in a short time by applying the piezo actuator 2 by the control device, the power supply unit, the drive driver, or the like. ..

According to the active vibration damping device 1 and the active vibration damping structure according to the present invention, it can be easily installed even in a narrow space such as under an interior floor plate in a structure such as an office building. It can be widely applied in the technical field.

1 Active vibration damping device,
2 Piezo actuator (mechanical amplification type),
2a base,
2b piezo element,
2c output unit,
2d bridge part,
3 Movable mass (weight),
4 Accelerometer,
5 Displacement meter,
6 floor slab,
7 Interior floorboards,
7a Support member,
8 space part,
10 mounting plate ,
11 hollowed out part (recessed part) ,
12 Periphery ,
13 Linear bush (guide mechanism) ,
14 Guide member ,
a, b arrows

Claims (3)

It is provided in a narrow space between a floor slab and an interior floor board supported by a support member on the floor slab.
A piezo actuator that is fixedly mounted on a mounting plate provided on the floor slab, and
A movable mass supported by the piezo actuator and
A control device electrically connected to control the excitation frequency of the piezo actuator,
It shall have at least an anti-rotation member for preventing rotation of the movable mass, which is arranged on the above-mentioned mounting plate in close proximity to the piezo actuator.
An active vibration damping device featuring. A piezoelectric actuator which is mounted fixed to the mounting plate of the floor slabs, said movable mass being supported by the piezoelectric actuator, and a control device for the being electrically to control the vibration frequency connection of the piezoelectric actuator At least have an active damping device,
In the space between the floor slab and the interior floor plate supported by the support member, the piezo actuator is fixed on the mounting plate of the floor slab, and the upper surface of the movable mass and the lower surface of the interior floor plate are It is arranged with a gap between them .
A rotation prevention member for preventing rotation of the movable mass is arranged on the mounting plate in close proximity to one to a plurality of the piezo actuators in the active vibration damping device.
Active vibration damping structure featuring. The movable mass has a weight of 50 kg to 150 kg, and one or ^{two active vibration damping devices are arranged per 100 m 2 of the floor area of the interior floor board.}
The active vibration damping structure according to claim 2.

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