JPH0738470U - Vibration control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To avoid the frictional force due to the seal resistance of the damper, to operate the vibration damping device from a slight vibration. [Configuration] When the building 8 shakes due to an earthquake force or wind pressure, the weight 20 starts to vibrate. At this time, since the restricting means 40 provided coaxially with the damper 30 suppresses the initial operation of the damper 30, the vibration damping device 10 starts its operation from a small shake. In this way, the vibration energy of the weight 20 is partially absorbed by the damper 30, and the vibration of the building 8 is attenuated. On the other hand, the vibration damping device 10 has the restricting means 4
With the action of 0, the damper 30 can be maintained in the non-operational state with respect to the vibration of a very small level.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a passive vibration damping device.

[0002]

[Prior art and its problems]

 Vibration control devices for buildings are roughly classified into active vibration control devices and passive vibration control devices. In the latter passive vibration control devices, TMD (Tuned Mass Dumper), which applies the pendulum principle, has been known. There is. The TMD is configured by combining a weight, a spring, a damper, etc., and a typical example of the conventional TMD is shown in FIG. The figure (a) is a type in which the weight 20 is supported by a roller 22, and the figure (b) is a pendulum in which the weight 20 is hung by a suspending member 24. Even in the case of the type (b), the spring material 26 may be added as illustrated.

In the above TMD, the spring constant of the spring material 26 and the suspension length of the suspension material 24 are set so that the weight 20 in the vibration damping device vibrates at a cycle substantially the same as the natural cycle of the building. When swaying due to a wind or an earthquake, the weight 20 resonates with the sway of the building and is large, and even if the swaying is out of phase, the weight 20 acts to reduce the sway of the building. In addition, the dampers 30 provided on both side surfaces of the weight 20 absorb the vibration energy of the weight 20 and do not shake the building by the swing of the weight 20 when the shaking of the building becomes small. It has been devised like this.

Therefore, in order for the vibration damping device to operate, it is necessary for the building to sway and an inertial force to act on the weight 20, while the vibration damping device includes a rolling part of the roller 22. If there is rubbing in the sliding bearing portions of the suspension member 24 and the seal member of the damper 30 and an inertial force exceeding the frictional force does not act on the weight 20, the vibration damping device Does not work. Therefore, it is necessary to minimize these frictional forces in order to operate the vibration damping device from a relatively small shake.

[0005]

[The purpose of the device]

 In order to apply the inertial force to the weight 20 in the initial stage, the present invention avoids the frictional force due to the seal resistance of the damper 30 which is difficult to reduce among the above-mentioned frictional forces, so that it is possible to operate from a slight shake. The purpose is to provide a vibration device.

[0006]

[Constitution of device]

 The present invention is a vibration damping device including a weight that vibrates at a cycle substantially the same as the natural cycle of a vibration damping object, and a damper for damping the vibration energy of the weight, thereby suppressing the initial operation of the damper. It is characterized by having a regulation means for

The restricting means has a rod head having a diameter larger than that of the rod formed at the tip of the piston rod that constitutes the damper, and a gripping portion that encloses the rod head. It is preferable that the rod is slidably supported within a predetermined range.

Further, the regulating means includes a slide rod having the same axial center as that of the piston rod forming the damper, and a grip portion formed at a tip of the slide rod and enclosing a rod head having a large diameter. It is preferable that the slide rod is slidably supported within a predetermined range by the grip portion.

[0009]

[Action]

 When the vibration control object shakes due to seismic force or wind pressure, the weight starts to vibrate. At this time, since the restricting means stops the initial operation of the damper, the vibration damping device operates from a small swing. In particular, if a structure is adopted in which the piston rod or the slide rod is slidably supported by the grip portion, the sliding resistance is much smaller than the seal resistance of the damper, so that the operation is performed reliably. Thus, the vibration energy of the weight is partly absorbed by the damper, and the vibration of the damping object is damped.

On the other hand, the vibration damping device can keep the damper in the inoperative state against the vibration of a very small level by the action of the restricting means.

[0011]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a vibration damping device 10. The vibration damping device 10 is installed on a rooftop of a building 8 which is a vibration damping target. In this embodiment, the vibration damping device 10 is attached to the building 8 via the frame 12, but is supported by the beams or floor slabs that are the constituent members of the building 8 without the frame 12 interposed. You can also Further, it is desirable that the vibration damping device 10 is installed on the rooftop, which is the portion of the building 8 that is the most swaying due to seismic force or wind force, or on the highest floor.

The vibration damping device 10 has a relatively flat block-shaped weight 20, and the weight 20 has a frame via a plurality of suspension members 24 made of a wire, a rope, a chain, a rod-shaped member, or the like. It is suspended from the upper part of 12. The weight of the weight 20 is preferably about 1% of the weight of the building 8. When the weight of the building 8 is relatively large, a plurality of the present devices 10 may be arranged in the same direction.

Hydraulic dampers 30, 30 are respectively arranged between the respective side portions of the weight 20 and the side portions of the frame 12 which face the weight 20, and the hydraulic dampers 30, 30 are respectively provided in the weight 20. It is responsible for damping vibrations. Therefore, instead of the hydraulic damper 30, or together with the hydraulic damper 30, damping means such as a hydraulic damper, a spring shock absorber, etc. may be used in addition to the viscous damper, the air damper. Reference numerals 26 and 26 are coil springs arranged in parallel with the hydraulic damper 30 for adjusting the cycle of the weight 20.

FIG. 2 is a detailed view of the hydraulic damper 30. In FIG. 2A, the left part is similar to the mechanism of the conventional hydraulic damper, and is composed of a cylinder 32, a piston 34, a piston rod 36, and the like. .

The right portion of FIG. 2 is a regulating means 40 added in the present invention. The regulating means 40 has a rod head 42 having a diameter larger than that of the piston rod 36 and a cylindrical shape in which the rod head 42 is accommodated. And a grip portion 44. The gripping portion 44 holds the rod head 42 so as to enclose the rod head 42, and the axis of the gripping portion 44 coincides with the axis of the piston rod 36.

A piston rod 36 is inserted through a through hole formed in the central portion of the head 46 of the grip portion 44 (the left end portion of the grip portion 44 in FIG. 2A), and the inner peripheral surface of the through hole is formed. The piston rod 36 is slidably supported by a bearing 48 such as a linear bush provided. On the other hand, the bottom 50 of the grip portion 44 (the right end portion of the grip portion 44 in FIG. 2A) forms a contact surface with the rod head 42, and the weight 20 is stationary (when the vibration damping device is not operating). The operating range of the hydraulic damper 30 can be controlled by the gap length between the bottom 50 or the inner wall surface of the head 46 and the rod head 42.

In this embodiment, the regulating means 40 is constituted by the slide mechanism that freely slides the piston rod 36 on the rod head 42 side for a certain distance. However, the invention is not limited to this, and the initial operating range of the hydraulic damper 30 is not limited to this. It may be a kind of restrictive play or play.

The regulating means 40 may be provided on either the piston rod side or the cylinder side of the hydraulic damper 30, as shown in FIGS. 2 (b) to 2 (d). At that time, instead of the piston rod 36, a slide rod 52 having the same axis as the piston rod 36 may be provided to configure the slide mechanism as described above.

Next, the operation of this vibration damping device will be described. Since the vibration cycle of the weight 20 is set to match the natural vibration cycle of the building 8, when the building 8 shakes due to seismic force or wind pressure, the weight 20 starts to vibrate. At this time, the vibration damping device 10 of the present invention can operate the device from a small shaking of the building as compared with the conventional TMD.

That is, since the friction of the bearing 48 that constitutes the regulating means 40 is extremely smaller than the seal resistance of the hydraulic damper 30, when an axial force is applied to the hydraulic damper 30, the friction of FIG. ), The cylinder 32 and the grip portion 44 approach each other, and the piston rod 36 first moves to the right while sliding in the through hole of the head 46. Next, when the cylinder 32 and the grip portion 44 come closer to each other and the rod head 42 of the piston rod 36 and the bottom 50 of the grip portion 44 come into contact with each other, the hydraulic damper 30 starts to operate. In this way, the vibration energy of the weight 20, that is, the vibration energy of the building 8 is partially absorbed by the hydraulic damper 30, and the shaking of the building 8 is alleviated.

On the other hand, the vibration damping device 10 of the present invention can keep the hydraulic damper 30 in the non-operating state against the level of swaying which is relatively frequent. As described above, the role of the hydraulic damper 30 is to absorb the vibration energy of the weight 20. However, if the vibration is extremely small, the vibration energy is also small, and friction such as the bearing portion of the suspension member 24 other than the damper is generated. Since the force is sufficiently absorbed by the force, the damping effect is secured even if the hydraulic damper 30 does not operate during a slight shake. Further, if the shaking becomes large, the hydraulic damper 30 operates as described above, and the inertial force of the weight 20 also becomes large, so that the sealing resistance becomes relatively small and it does not pose a problem in the operation of the apparatus.

According to the present invention, the weight 20 as shown in FIG. 3A is supported by the roller 22, the hydrostatic bearing, the magnetic levitation device, etc. to vibrate horizontally on the plane. It can also be applied to a type of vibration control device.

[0023]

[Effect of device]

 The vibration damping device of the present invention avoids the frictional force due to the seal resistance of the damper part, which is relatively difficult to reduce, among the frictional forces in the device, and thereby operates the vibration damping device from a slight shake. You can Therefore, it is possible to reliably absorb the vibration energy that enters the building during an earthquake or a strong wind, to reduce the shaking of the building, and to further improve the habitability of the building.

Further, since the vibration damping device of the present invention can keep the damper in the inoperative state against the vibration of a very small level, it is also effective in reducing the consumption of the sealing material of the damper. Have

[Brief description of drawings]

FIG. 1 is a schematic view of a vibration damping device according to the present invention.

FIG. 2 is a detailed view of a hydraulic damper having a regulation unit.

3A and 3B are schematic diagrams showing a typical example of a conventional TMD.

[Explanation of symbols]

 10 Damping Device 20 Weight 24 Suspension Material 26 Spring Material (Coil Spring) 30 Hydraulic Damper 32 Cylinder 34 Piston 36 Piston Rod 40 Restricting Means 42 Rod Head 44 Grip 48 Bearing 52 Slide Rod

Claims (3)

[Scope of utility model registration request] 1. A vibration damping device comprising a weight that vibrates at a cycle substantially the same as the natural cycle of a vibration damping object and a damper for damping the vibration energy of the weight, and the initial operation of the damper is stopped. A vibration damping device comprising: 2. A rod head having a diameter larger than that of the rod formed at the tip of a piston rod that constitutes the damper, and a gripping portion that encloses the rod head. 2. The vibration damping device according to claim 1, wherein the piston rod is slidably supported within a predetermined range. 3. The regulating means includes a slide rod having the same axis as a piston rod forming the damper, and a gripping portion formed at a tip of the slide rod and enclosing a rod head having a large diameter. The vibration damping device according to claim 1, wherein the gripping portion slidably supports the slide rod within a predetermined range.