JPH10311164A - Friction damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to vary damping force which is necessary for vibration control of a structure in the case an earthquake occurs and to enable the control of absorption quantity of vibration energy. SOLUTION: A friction damper is equipped with multiple slide plate 12, multiple damping plate 14 fixing both ends thereof to the other side of a reinforcing frame 70 and a pair of holding plates having through-holes overlapping with each other provided at the outside of the multiple damping plate 14. It is equipped with a damping force providing device having a flange nut 20 on a ball screw passing through the through-holes of the holding plates multiple damping plate 14 and multiple slide plate 12 in a movable manner and having the nut to be tightened and fixed in a state to hold specific damping force by holding elastic materials such as the flange section of the nut, Belleville spring, etc., to push a pair of holding plates from the outside, a driving device 30 for turning the flange nut 20 through a T-shaped arm and a controlling device 50 detecting relative movement speed between the multiple slide plate 12 and the multiple damping plate 14 by a detector 40 and turning the flange nut 20 in accordance with the relative movement speed to adjust the damping force providing device to the optimum damping force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction damper of a variable braking force for mounting on a building or structure, absorbing vibration energy generated in the building or structure during an earthquake or the like, and reducing vibration.

[0002]

2. Description of the Related Art In FIG. 7, in a building or a structure 80, a damping damper 81 for absorbing vibration energy and relaxing braking in an earthquake or the like is arranged in a section surrounded by a column 82 and a beam 83. Has been provided.

FIGS. 8 (a), 8 (b) and 8 (c) schematically show three types of conventionally used dampers 81 as such damping dampers 81. FIG.

FIG. 8 (a) shows a reinforcing frame 70 fixed in a frame surrounded by columns and beams of a building or the like, and a brace 71e and 71f in which a diagonally intermediate portion of the reinforcing frame 70 is divided. To
Providing multiple metal plates 72 that protrude and overlap with each other,
This is a friction damper in which a fixed surface pressure is applied by bolting the multiple metal plates 72 through long holes 73. This damper absorbs vibration energy by frictional force between the metal plates 72 and suppresses vibration when a tensile or compressive force is applied to the brace in the direction of the arrow when the structure vibrates.

FIG. 8B shows an elasto-plastic damper using a low yield point steel 74 between a lower end of a V-shaped brace 71 and a lower portion of a reinforcing frame 70. This damper absorbs vibration energy by plastic deformation of the low yield point steel 74 when the structure vibrates, and suppresses vibration.

FIG. 8C shows a hydraulic cylinder 75 connected horizontally between the lower end of the V-shaped brace 71 and the lower part of the reinforcing frame 70.
This is a hydraulic damper provided with. This hydraulic damper is provided with a pressure oil throttle passage pipe that connects and connects the head side and the rod side of the hydraulic cylinder 75, and the flow resistance of the fluid that moves inside the hydraulic cylinder 75 between the head side and the rod side when the structure vibrates. Absorbs vibration energy with force and suppresses vibration.

[0007]

The above-mentioned conventional damper device has the following problems. 8A, when the vibration load is smaller than a certain load that causes slippage between the metal plates 72, no slippage occurs, and thus no vibration energy is absorbed. The low-yield-point steel 74 in the elasto-plastic damper of FIG.
If the load is smaller than the yield load, plastic deformation of the damper does not occur, and therefore, vibration energy is not absorbed. 8C, the hydraulic cylinder 75 generally has a large diameter, and it is difficult to dispose the structure inside the wall surface. 8 (a) and 8 (b) always resist a fluctuating vibration load with a constant braking force, and cannot perform vibration suppression corresponding to the fluctuating load.

An object of the present invention is to make the braking force necessary for damping a structure during an earthquake or the like variable and control the amount of vibration energy absorbed, in response to the above-mentioned conventional problems. .

[0009]

In order to achieve this object, according to the present invention, there is provided a friction damper for absorbing vibration energy provided between members constituting a structure,
A sliding plate provided on one member, a brake plate provided on the other member and in contact with the slide plate, means for detecting a relative moving speed between the slide plate and the brake plate, It is characterized by comprising: means for pressing the plate in a direction in which the plates contact each other; and control means for controlling the pressing force of the pressing means based on the relative moving speed detected by the relative moving speed detecting means.

[0010] Further, a multi-slide plate having one end fixed to one side of the reinforcing frame, arranged parallel to the displacement direction with a gap between the plate surfaces, and having an elliptical through hole in the center, and a through hole in the center. A multi-brake plate having both ends fixed to the other side of the reinforcing frame across the gap and outside of the multi-slide plate and back and forth, and a pair of through holes with a through hole provided on the outside of the multi-brake plate Board and
A nut with a flange is movably provided on a ball screw passing through the through hole of the holding plate, the multiple braking plate, and the multiple sliding plate, and a pair of holding plates are sandwiched from outside with a flange portion of the nut and an elastic material such as a disc spring interposed therebetween. A braking force applying means provided by pressing and holding the nut in a state of holding a predetermined braking force, a device for rotating the nut with flange, and a relative moving speed between the multiple slide plate and the multiple brake plate. And a control device for detecting and detecting the relative movement speed to rotate the nut with a flange to adjust the braking force applying means to an optimum braking force.

[0011] Further, an arm provided with a rotating device for the nut with a flange protruding radially outward from the peripheral surface of the flange portion of the nut and having an arcuate external gear at the tip thereof, And a servomotor having a driving pinion that meshes with the servomotor.

Further, the damper device is provided between each lower end of the chevron brace of the reinforcing frame and the vicinity of both corners of the opposing reinforcing member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment [Configuration] FIGS. 1 to 4 show a first embodiment of a friction damper according to the present invention. FIG. 1 is a front view showing an entire mounting state, and FIG. FIG. 3 is an enlarged front view, and FIG.
FIG. 4 is a block diagram of a schematic configuration of the control device. In FIG. 3, the rotation device of the nut with a flange in FIG. 2 is shown by a dashed line in a horizontal state.

In FIG. 1, reference numeral 1 denotes a variable braking force type friction damper according to the present invention. The variable braking force type friction damper 1 includes a V-shaped brace 71 at a lower end of a V-shaped brace 71 in a reinforcing frame 70 fixed in a frame surrounded by columns or beams of a building or a structure, and a lower side 70b of the opposing reinforcing frame 70. Wearing in between.

10 is a friction damper main body, 30 is a driving device for adjusting a braking force, 40 is a detector for detecting the relative moving speed of the upper and lower mounting portions of the friction damper main body 10, and 50 is the relative movement detected by the detector 40. The driving device 3 according to the speed
Reference numeral 60 denotes an uninterruptible power supply device for driving the friction damper main body 10 to an optimum frictional braking force by driving the friction damper main body 10.

2 and 3, the friction damper body 10 has a V-shaped brace 7 at one end parallel to the surface of the reinforcing frame 70.
A metal multiplex slide plate 12 integrally fixed to a substrate 12a at the lower end, multiplexed with gaps between the plate surfaces, and provided with an elliptical through hole 11 in the center in the displacement direction;
A metal multiple braking plate 14 having both ends fixedly supported by the legs 14b on the lower side 70b of the reinforcing frame and arranged in the center thereof with a through hole 13 in an arrangement straddling the front and rear passing through the gap 2 and the outside;
Multiple brake plates 14 so that both surfaces of multiple slide plates 12 can be contacted
A friction plate 16 having a through hole 15 fixed to the surface thereof;
4 and a pair of holding plates 18 provided with through holes 17 fixed at the outer center thereof, and tightened and fixed through the respective through holes 14, 15, 13, 11 of the holding plate 18, the multiple brake plates 14, and the multiple slide plates 12. Ball screw 19, a nut 20 with a flange screwed onto the ball screw 19 from one of the holding plates 18 and held in a through hole, a flange holding washer 21, between the flange and the holding plate 18, and between the flange and the flange holding washer. A thrust bearing 22 interposed between the flange 21 and an elastic body such as a disc spring 23 and washers 24 and 2 are provided outside the flange holding washer 21.
5 and a tightening nut 26 screwed to both ends of the ball screw 19. Accordingly, a braking force applying means is constituted by the presser plate 18, the ball screw 19, the flanged nut 20, the flange presser washer 21, the thrust bearing 22, the elastic body such as the disc spring 23, the washers 24 and 25, the tightening nut 26 and the like. You.

In FIG. 3, the number of the multiplex slide plates 12 is omitted and only two are shown.
Reference numeral 2 denotes a multiplex configuration of about 10 sheets.

The driving device 30 for adjusting the braking force is provided on a T-shaped arm 31 which is fixed to the outer peripheral surface of the flange 20f of the flanged nut 20 and extends outward, and an arc-shaped head surface of the T-shaped arm 31. It comprises an external gear 32 and a servomotor 35 having a drive pinion 34 disposed on a horizontal connecting member 33 near the lower end of the V-shaped brace 71 and meshing with the external gear 32.

In FIG. 4, the control device 50 includes an input unit 5
1, a control unit 52, and an output unit 53, and receives a signal of the relative movement speed detector 40 into an input unit 51, and
The control amount of the servomotor corresponding to the relative moving speed detected in step (1) is obtained, the servomotor 35 is controlled through the output unit 53, the flanged nut 20 is moved in the axial direction of the ball screw 19, and the multiple braking plate of the friction damper body 10 is moved. The tightening strength (ie, the braking force) of the slide plate 14 and the multiple slide plates 12 is automatically controlled to an optimum value.

The servo motor 35, the relative moving speed detector 40, and the control device 50 are operated using an uninterruptible power supply 60 as a power supply.

[Operation and Effect] The ball screw 19 is tightened with the tightening nut 26 on the outer side of the multiple slide plate 12, the multiple brake plate 14, and the holding plate 18 with an elastic body such as a disc spring 23 interposed therebetween, thereby producing friction. Multiple damping plate 1 of damper body 10
4 and the multiple slide plates 12 are fixed while holding a constant initial friction braking force.

The initial friction braking force is set to a value that can absorb the maximum to intermediate vibration energy expected to occur in the structure.

The nut with flange 20 is provided with a nut 26 for tightening.
As a result, the ball is pushed by the flange holding washer 21 and is screwed on the ball screw 19 to move to the back. At the position where the tightening nut 26 is completely tightened, the T-shaped arm 31 of the nut 20 is rotated together with the ball screw 19 to a predetermined position where the T-arm 31 engages with the drive pinion 34 of the servo motor 35, and is aligned and fixed.

When a vibration occurs in the structure 80 due to a wind or an earthquake, the relative moving speed between the layers of the structure is continuously detected by the detector 40 and is taken into the control device 50. The servo motor 35 is controlled and driven according to the detected relative moving speed, and the drive pinion 34,
By rotating the nut with flange 20 via the external gear 32 and the T-shaped arm 31, the friction braking force initially set in the friction damper body 10 is controlled to increase or decrease to an optimum value.

If the detected relative moving speed is equal to or lower than the initial friction braking force, the flanged nut 20 is slightly rotated in a direction of pushing the nut 20 toward the disc spring 23 to weaken the set initial friction braking force. When the relative moving speed is equal to or higher than the initial friction braking force, the set initial friction braking force is increased by slightly rotating the flanged nut 20 in the opposite direction, and the friction braking force of the friction damper body 10 is controlled to an optimum value. I do.

At this time, the relative moving speed between the layers generated by the vibration of the structure and the optimum friction braking force are in a proportional relationship, and the flanged nut 20 corresponding to the optimum friction braking force is provided.
The amount of rotation adjustment and the amount of adjustment drive of the servo motor 35 can be calculated in advance and set in the control unit 52. For this reason, it is possible to quickly and automatically follow from the detection of the relative movement speed by the detector 40 to the adjustment of the optimum frictional braking force of the friction damper body 10 by the control device 50 in a very short time.

Therefore, the vibration energy generated in the structure 80 in the entire variation range of the vibration is always effectively absorbed by the optimum braking force, and the effect of suppressing the vibration can be obtained.

Further, in such a friction damper 1 of a variable braking force, the uninterruptible power supply 60
Even when the system does not operate, the mechanical friction braking force initially set works, and there is an advantage that the vibration damping function can be maintained within the range of the friction braking force.

The variable braking force type friction damper 1 described above is arranged and arranged between the reinforcing frame 70 and the brace 71 shown in FIG. 1, and the multiple sliding plates 12 and the braking plates 14 within the wall thickness range. Is provided, as an example, it is possible to configure as a device that absorbs a 200-ton horizontal vibration load applied to the structure 80.

[Second Embodiment] [Configuration] FIG. 5 is a front view corresponding to FIG. 1 showing a second embodiment of the present invention. In this embodiment, angled braces 71a and 71b are integrally provided in a reinforcing frame 70, and a similar braking force variable friction damper 1 is provided between the lower end of each of the braces 71a and 71b and both lower corners of the reinforcing frame 70. Are provided in a symmetrical arrangement.

The multiple brake plates 14 of the friction damper body 10
Are fixed at both lower corners of the reinforcing frame 70 so as to extend over the lower reinforcing frame 70b and the side reinforcing frame 70c, and are fixed.
The multiple slide plates 12 on the sides a and 71b are
It is provided so as to intersect at right angles to the direction.

[Operation and Effect] In this embodiment, the structure 8
During the horizontal vibration of zero, the braces 71a, 71b
The vibration load applied in the axial direction is absorbed by the friction damper bodies 10 by 200 tons, respectively, a large vibration load of 400 tons in total, and the effect of suppressing vibration can be obtained. The operation and effect of the variable braking force type friction damper 1 are the same as those of the first embodiment.

[Third Embodiment] [Structure] FIG. 6 is a front view corresponding to FIG. 1 showing a third embodiment of the present invention. In this embodiment, one diagonal brace 71c is integrally provided in the reinforcing frame 70, and between the lower corner of the reinforcing frame 70 and the tip of the diagonal brace 71c as in the second embodiment. This is a case where a variable braking force type friction damper 1 is provided. Reference numeral 61 denotes an entrance door arranged on the wall of a structure on which the variable frictional damper 1 is provided.

[Operation and Effect] In this embodiment, the structure 8
In the horizontal vibration of 0, the effect of absorbing the 200 tons vibration load applied in the axial direction of one diagonal brace 71a and suppressing the vibration is obtained. There is an advantage that facilities such as the entrance door 61 can be arranged on the same wall without interference.

[0035]

In summary, the present invention relates to a vibration damper for a structure, which is a friction damper for absorbing vibration energy provided between members constituting the structure, wherein a slide plate provided on one of the members is provided. And a brake plate provided on the other member and in contact with the slide plate, means for detecting a relative movement speed between the slide plate and the brake plate, and pressing the slide plate and the brake plate in a direction in which they contact each other. Means, and control means for controlling the pressing force of the pressing means based on the relative moving speed detected by the relative moving speed detecting means, so as to respond to the vibration load of the entire range of vibration generated in the structure. Thus, the friction damper of the friction damper is always controlled to the optimum braking force, and the effect of providing a device capable of effectively absorbing and suppressing vibration energy is provided.

A multi-slide plate having one end fixed to one side of the reinforcing frame, a gap between the plate surfaces, parallel to the direction of displacement, and an elliptical through hole in the center, and a through hole in the center. A multi-brake plate having both ends fixed to the other side of the reinforcing frame across the gap and outside of the multi-slide plate and back and forth, and a pair of through holes with a through hole provided on the outside of the multi-brake plate Board and
A nut with a flange is movably provided on a ball screw passing through the through hole of the holding plate, the multiple braking plate, and the multiple sliding plate. A braking force applying means provided by pressing and holding the nut in a state of holding a predetermined braking force, a device for rotating the nut with flange, and a relative moving speed between the multiple slide plate and the multiple brake plate. And a control device for rotating the flanged nut in accordance with the relative movement speed and adjusting the braking force applying means to an optimum braking force. The vibration damping force of the friction damper is always controlled to the optimum braking force according to the load during vibration, effectively absorbing and suppressing vibration energy, and retaining the damper itself even during a power failure. In the range of 械的 initial frictional braking force, and it provides an advantage to provide a device which can absorb suppress vibration.

Further, an arm provided with a rotating device for the flanged nut protruding radially outward from the peripheral surface of the flange portion of the nut and having an arcuate external gear at the end thereof, and an arm having this external gear. The configuration using the servo motor having the meshing drive gear has an effect of providing a compact means for easily, promptly and accurately variably controlling the initial friction braking force held by the friction damper.

Further, by providing two sets of the damper device between each lower end of the chevron brace of the reinforcing frame and the vicinity of both corners of the opposing reinforcing material, a friction damper having a larger vibration damping force is provided. The effect of providing was achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a variable braking force type friction damper according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part of FIG.

FIG. 3 is a horizontal sectional view taken along arrows III to III in FIG. 2;

FIG. 4 is a block diagram showing a schematic configuration of a control device.

FIG. 5 is a front view of a variable braking force type friction damper according to a second embodiment of the present invention.

FIG. 6 is a front view of a braking force variable friction damper according to a third embodiment of the present invention.

FIG. 7 is a side view of a structure in which a vibration damper is arranged in a wall section.

8 (a), (b), and (c) are front views of three examples of a conventional vibration damper.

[Explanation of symbols]

 Reference Signs List 1 friction damper of variable braking force 10 friction damper main body, 11, 13, 15, 17, 27 through hole 12 multiple slide plate 14 multiple brake plate 14b leg 16 friction plate 18 holding plate 19 ball screw 20 nut with flange 20f flange DESCRIPTION OF SYMBOLS 21 Flange holding washer 22 Thrust bearing 23 Disc spring 24, 25 Washer 26 Tightening nut 30 Brake force adjusting drive 31 T-shaped arm 32 External gear 33 Horizontal coupling material 34 Drive pinion 35 Servo motor 40 Relative movement speed detector 50 Control device 51 Input unit 52 Control unit 53 Output unit 60 Uninterruptible power supply 70 Reinforcement frame 71, 71a, 71b, 71c Brace 80 Building or structure

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makoto Naruse 4-6-22 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Inside the Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (4)

[Claims] 1. A friction damper for absorbing vibration energy provided between members constituting a structure, wherein a slide plate provided on one member and a brake plate provided on the other member and in contact with the slide plate. Means for detecting a relative movement speed between the slide plate and the brake plate; means for pressing the slide plate and the brake plate in a direction in which they contact each other; and a relative movement speed detected by the relative movement speed detection means. Control means for controlling the pressing force of the pressing means based on the frictional damper. 2. A multi-slide plate having one end fixed to one side of a reinforcing frame, arranged in parallel with the displacement direction with a gap between the plate surfaces, and having an elliptical through hole in the center, and a through hole in the center. A multi-brake plate having both ends fixed to the other side of the reinforcing frame across the gap and outside of the multi-slide plate and back and forth, and a pair of through holes with a through hole provided on the outside of the multi-brake plate A plate, a nut with a flange movably provided on a ball screw passing through a through hole of the holding plate, the multiple braking plate, and the multiple sliding plate, and a pair of holding plates sandwiching the flange portion of the nut and an elastic material such as a disc spring. , A braking force applying means provided by tightening and fixing the nut to hold the predetermined braking force from the outside, a device for rotating the nut with flange, and a relative position between the multiple slide plate and the multiple brake plate. Detects the moving speed and, based on this relative moving speed, A control device for rotating the nut with a flange to adjust the braking force applying means to an optimum braking force. 3. An arm provided with a pivoting device for the nut with a flange protruding radially outward from a peripheral surface of a flange portion of the nut and having an arcuate external gear at the end thereof. 3. A friction damper according to claim 2, wherein said friction damper comprises a servomotor having a driving pinion that meshes with said servomotor. 4. The friction according to claim 2, wherein the damper device is provided between each lower end of the chevron brace of the reinforcing frame and the vicinity of both corners of the opposing reinforcing member. Damper.