JPH0723741B2 - Vibration damping device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device that absorbs kinetic energy to damp vibration, and in particular, is used in combination with a vibration isolation or vibration isolation device between a foundation and a structure such as a building or a machine. The present invention relates to a vibration damping device suitable for

[Prior art]

In order to protect various structures such as buildings that house computers and nuclear facilities from the force of earthquakes and vibrations, to support the vibration isolation of precision machinery that is resistant to vibration, or to support the vibration source of machinery as a vibration source. For the purpose of doing so, these structures are supported displaceably with respect to the foundation through elastic supporting means or sliding means.

When supporting a structure in such a displaceable manner, it is required to absorb energy such as an earthquake or mechanical vibration and damp the transmitted vibration.

Basically, this type of vibration damping device can be roughly classified into a fluid damper that uses the viscous resistance of a fluid (including a high-viscosity water-like fluid) and a plastic damper that uses plastic deformation of metal or the like. .

The present invention belongs to the former fluid damper.

As the fluid damper, conventionally, an oil cylinder illustrated in FIG. 8 and a shear resistance type illustrated in FIG. 9 have been proposed.

In the oil cylinder of FIG. 8, a piston rod 24 having an orifice 23 is fitted to a cylinder 22 filled with oil 21, and a damping force is generated by viscous resistance generated at the orifice 23 when the cylinder 22 and the piston rod 24 move relative to each other. Is what you get.

However, in this oil cylinder, since it acts only in the moving direction of the piston rod 24 and has directionality, it is usually necessary to install a plurality of oil cylinders in different directions, and the structure is complicated and the required space is small. There is a problem that it becomes large and the cost also increases.

The shearing resistance type damper shown in FIG. It utilizes the viscous resistance generated in.

However, this shear resistance type damper has a problem that foreign matters such as dust and sand are easily mixed in the fluid 26, which requires time and effort for maintenance.

〔Purpose〕

The present invention has been made in view of such a conventional technique, and an object of the present invention is that the structure is compact and has no directionality, and that foreign matter is not mixed in and maintenance is easy, and the elastic bag body is made. A large stable vibration damping force can be obtained by utilizing the flow resistance when the viscous fluid sealed inside is flowing inside the porous material, and the damping force can be adjusted in a wide range depending on the type of porous material. A vibration damping device is provided.

〔Overview〕

The present invention relates to a vibration damping device that is used together with an elastic support device when a structure is connected and supported on a foundation via a elastic support device for weight support that can be largely elastically displaced in the horizontal direction so that the structure can be relatively displaced in the parallel direction. , A sponge-like deformable porous material containing a high-viscosity oil or a syrup-like viscous fluid such as asphalt is sealed in a rubber elastic bag to form an elastic bag, and the elastic bag is Hold in a pre-compressed state and in a rollable state between the surface on the side of the base and the surface on the side of the structure that can be relatively displaced in the parallel direction, and the base and the structure are relatively displaced and the elastic bag body is The object described above is achieved by adopting a constitution in which, when rolling, the flow-through resistance of the syrup-like viscous fluid flows inside the porous material to generate a damping force for the relative displacement. .

[Examples] The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a vertical cross section of a vibration damping device according to an embodiment of the present invention, and FIG. 2 shows a vertical cross section of the elastic bag in FIG. 1 in an unused state.

1 and 2, the elastic bag body 1 has a structure in which a porous material 3 containing a viscous fluid 2 is sealed in a bag 4 made of a rubber-like elastic material.

As shown in FIG. 1, the elastic bag body 1 is held in a precompressive deformation state and in a rollable state between two surfaces 5 and 6 which can be relatively displaced (relatively moved) in the parallel direction. By mounting, a damping force against vibration between the two surfaces 5 and 6 (especially vibration in a direction indicated by a solid or dotted arrow) is generated.

As the porous material 3 filled in the elastic bag body 1, it is preferable to use a sponge-like deformable material, which may be an integral type or a block-like divided type, and further, a chip-like shape. Things can also be used.

The viscous fluid 2 contained in the porous material 3 has a desired viscosity (generally high viscosity), and for example, high-viscosity oil or syrup-like fluid substance such as asphalt may be used. it can.

When the vibration damping device of FIG. 1 is used between a foundation and a structure, for example, the lower surface 5 constitutes the upper surface of the foundation and the upper surface 6 is a base for supporting the structure or the structure. It can be used to form the bottom of an object. In this case, the weight of the structure (including its base, etc.) is supported by a separately provided elastic support device or sliding surface so as to be relatively movable laterally.

FIGS. 3A and 3B show the operation of the vibration damping device of FIG.

From the initial state of FIG. 3 (A), the upper surface 6 moves in the direction of the solid arrow or the lower surface 5 moves in the direction of the chain line, so that relative movement between the upper and lower surfaces 5 and 6 occurs. When it occurs, the elastic bag 1 rolls in the direction of arrow X (rolls with almost no slip between the upper and lower surfaces 5 and 6), and the upper and lower central points A and B are shown in FIG. 3 (A). To move as shown in FIG. 3 (B).

During this rolling, the viscous fluid 2 in the bag 4 moves (flows) in the porous material 3 as illustrated by an arrow Y.

A damping force against movement (usually vibration) between the two surfaces 5 and 6 is generated by the flow resistance (viscous resistance) when the viscous fluid 2 moves in the porous material 3.

FIGS. 4 and 5 show a face plate 9 having smooth surfaces 5 and 6 on a foundation 7 and a structure (or its base) 8, respectively.
10 is a side view and a cross-sectional view showing a state in which 10 is fixed and the elastic bag body 1 is held between these face plates.

However, these face plates 9 and 10 can be omitted when the surfaces of the foundation 7 and the structure 8 are good.

6 and 7 schematically show a state in which the vibration damping device according to the present invention is used together with the elastic supporting device 11 for supporting the weight.

The elastic support device 11 in this case has, for example, flanges 13 and 14 fixed to the upper and lower ends of the elastic support 12 in which a rubber-like elastic body and a reinforcing plate such as a metal plate are alternately laminated, and upper and lower surfaces of these flanges. It has a structure in which it is fixed to bolts 6 and 6.

When the upper and lower surfaces 6 and 5 relatively move in the arrow direction due to an earthquake or vibration, the elastic support body 12 and the elastic bag body 1 move from the solid line position to the chain line position, and these movements effectively demonstrate the vibration damping function. can do.

According to the supporting device of FIGS. 6 and 7, it is possible to obtain a vibration absorbing supporting device having no directionality and easy maintenance.

According to the embodiment described above, the porous material 3 containing the viscous fluid 2 is sealed in the rubber elastic bag 4 to form an elastic bag body, and the elastic bag body is relatively displaced in the parallel direction. Since it is held in a pre-compressed deformation state and in a rollable state between the two possible surfaces 5 and 6, when the relative movement occurs between the two surfaces 5 and 6 due to an earthquake or vibration, the flow resistance of the viscous fluid is increased. And a damping force can be generated.

In that case, since the flow resistance when the syrup-like viscous fluid flows inside the porous material is utilized, a large stable damping force can be obtained, and not only the property of the viscous fluid but also the porous material You can adjust the damping performance depending on the type,
It is possible to adjust the damping force in a wide range.

Further, since the elastic bag body 1 is only sandwiched, the vibration damping device is compact and has a small number of parts, no directionality, and is easy to maintain with no foreign matter mixed in and excellent in workability. Is obtained.

In the illustrated embodiment, the elastic bag 1 is a sphere, but it may be a hemisphere, a disc, or any other suitable shape.

Furthermore, it can be similarly applied to a relatively small and lightweight structure installed in a room.

[Effect] As is apparent from the above description, according to the present invention, the structure is connected and supported on the foundation so as to be relatively displaceable in the parallel direction via the elastic supporting device for supporting the weight that can be largely elastically displaced in the horizontal direction. In this case, a sponge-like deformable porous material containing a highly viscous oil or a syrup-like viscous fluid such as asphalt is sealed in a rubber-like elastic material bag in a vibration damping device. To form an elastic bag,
The elastic bag is held in a precompressed state and in a rollable state between a surface on the side of a base and a surface on the side of a structure that can be relatively displaced in the parallel direction, and the base and the structure are relatively displaced. When the elastic bag rolls, a flow resistance when the water-filled viscous fluid flows inside the porous material generates a damping force for the relative displacement, so that the structure is compact. There is no directionality, there is no foreign matter mixed in, and maintenance is easy. Moreover, large stable vibration damping is achieved by using the flow resistance when the viscous fluid sealed in the elastic bag flows inside the porous material. Can gain power,
Provided is a vibration damping device capable of adjusting the damping force in a wide range depending on the type of porous material.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vibration damping device according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the elastic bag body in FIG. 1 when not in use, FIG. 3 (A) and FIG. FIG. 2B is a schematic vertical sectional view illustrating the behavior of the elastic bag body with the relative movement of the two surfaces,
FIG. 4 is a side view illustrating a case where an elastic bag is held by a face plate fixed to a foundation and a structure, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. FIG. 7 is a side view schematically showing a case where an elastic support device and a vibration damping device according to the present invention are used together, FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, FIG. FIG. 9 is a schematic vertical sectional view illustrating a conventional vibration damping device. 1 ... Elastic bag, 2 ... Viscous fluid, 3 ... Porous material, 4
…… Bag, 5,6 …… Two sides.

Claims (1)

[Claims] 1. A vibration damping device used together with an elastic supporting device when a structure is connected and supported on a foundation via a weight supporting elastic supporting device which can be largely elastically displaced in the horizontal direction so as to be relatively displaceable in the parallel direction. In, a sponge-like deformable porous material containing a syrup-like viscous fluid such as high-viscosity oil or asphalt is sealed in a rubber-like elastic material bag to form an elastic bag body. The body is held in a pre-compressed state and in a rollable state between the surface on the side of the base and the surface on the side of the structure that can be relatively displaced in the parallel direction, and the base and the structure are relatively displaced to cause the elastic bag. A vibration damping device, wherein when the body rolls, a damping force for the relative displacement is generated by a flow resistance when the starch syrup-like viscous fluid flows inside the porous material.