JP3586506B2 - Drum type frictional resistance variable device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration damping device applied to a high-rise structure such as a building or a high-rise chimney.
[0002]
[Prior art]
Not to mention the example of the Great Hanshin Earthquake, when a seismic force G acts on a structure, especially a building or a high-rise structure such as a high-rise chimney, as shown in FIG. 8, for example, the structure C vibrates, and its vibration displacement x becomes higher. The more they become, the larger they become, and they damage the structure.
[0003]
In order to deal with this, various vibration damping devices are installed in recent high-rise structures. Conventionally, the following vibration control methods are generally employed.
[0004]
(1) Passive vibration damping method This is a method of reducing vibration by incorporating a vibration damper or a resistor that plasticizes and absorbs energy in a proper place in a structure to absorb vibration energy.
[0005]
(2) Active control method (A)
In this method, actuators are installed at appropriate places in a structure, and a force equivalent to seismic energy is activated to reduce vibration.
[0006]
(3) Active control method (B)
In this method, a structural material such as a brace is removably attached to an appropriate position of the structure, and the brace is connected or detached according to the vibration wave to change the rigidity of the structure to avoid resonance.
[0007]
[Problems to be solved by the invention]
By the way, the following problems exist in the conventional vibration damping means for a high-rise structure.
[0008]
That is, the method (1) (passive vibration control method) is relatively effective for a large earthquake, but the stroke of the device is limited. In addition, it may not work for small and medium earthquakes.
[0009]
The method (2) (active vibration suppression method A) has a large vibration damping effect, but has a problem in that the size of the actuator is increased and power is not secured during a power failure.
[0010]
Further, the method (3) (active vibration suppression method B) is effective when a specific vibration wave is dominant, but has a small effect on an earthquake in which various vibration waves coexist.
[0011]
An object of the present invention is to solve the above-mentioned disadvantages and to provide a new frictional resistance variable device capable of effectively attenuating relative vibration acting between two frames regardless of the vibration speed. And
[0012]
[Means for Solving the Problems]
As a configuration for achieving the above object, a drum-type frictional resistance varying device according to the present invention is attached to the ends of a pair of arms rotatably supported on one of two frames that are relatively vibrated. A friction disk having an inclined friction surface formed on the outer periphery thereof, and an inclined friction surface corresponding to the inclined friction surface of the friction disk formed therein, supported by the other frame. And a mechanism for moving the pair of friction disks in a symmetrical direction and a driving means thereof so that the friction table is stored in the inner space of the receiving table and the inclined friction surfaces are brought into contact with each other. A means for detecting a frictional resistance generated between the inclined friction surfaces, and means for controlling an output of the driving means so that the frictional resistance becomes a predetermined value.
[0013]
Also, the friction disk moving mechanism is provided with an inner hole in the center of the pair of friction disks, engraving left and right screws on the periphery thereof, and the outer periphery of both ends, the inner hole peripheral edge is provided. It is also preferable that the worm is configured by a worm supported by a shaft provided with a screw engaged with each screw, and a worm gear mechanism including a worm gear engaged with the worm and rotated by the driving means.
[0014]
Further, the friction disc moving mechanism is provided with an inner hole in the center of the pair of friction discs, engraving left and right screws on the periphery thereof, and each of the inner hole peripheral edges on the outer periphery of both ends. It is also effective to form a lever having a shaft on which a screw engaged with the screw is engraved, one end of which is connected to the shaft, and the other end of which is connected to the driving means.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described as Example 1 and Example 2 with reference to the drawings.
[0016]
FIG. 1 is a longitudinal sectional front view of a frictional resistance varying device according to a first embodiment of the present invention, and FIG. 2 is a side view of the device.
[0017]
In these figures, the frictional resistance varying device (vibration damping device) of the present invention is inserted between two frames, that is, frames A and B, which relatively vibrate in a high-rise structure or the like.
[0018]
On the frame B side, a pair of arms 2a and 2b are rotatably supported at one end by the frame B via a plate 10 and a pin 3. The other ends of the arms 2a and 2b Friction disks 4a and 4b having inclined friction surfaces 4c and 4d, respectively, are provided integrally, and inner holes 4e and 4f are formed in the center of the friction disks.
[0019]
A shaft 5 having left and right screws engraved on the respective peripheral edges facing the inner holes 4e and 4f, and screws engraved on the outer periphery at both ends to engage with the respective screws on the inner hole peripheral edges. A worm gear mechanism comprising a worm 7 supported by the worm, a worm gear 6 engaged with the worm 7, and a motor 9 for driving the worm gear 6 is provided as a moving mechanism for the friction disks 4a and 4b.
[0020]
On the other hand, on the frame A side, inclined friction surfaces 8a and 8b corresponding to the friction surfaces 4c and 4d of the friction disks 4a and 4b are formed on the inner wall surface, and the inclined friction surfaces 4c, 8a and 4d are formed in the internal space. The receiving table 8 containing the friction disks 4a and 4b is supported in a state where the friction disks 4a and 8b are in contact with each other, and is inserted between the plate 10 and the frame B to generate the frictional resistance generated by the apparatus. And a control device 16 for controlling the output of the motor 9 based on the detected value, and these members constitute a frictional resistance varying device.
[0021]
Hereinafter, the operation of the present embodiment will be described. Now, the apparatus is inserted between the frame A and the frame B in a state where the friction surfaces 4c and 4d of the friction disks 4a and 4b and the friction surfaces 8a and 8b of the receiving table 8 are pressed with a predetermined pressing force. Have been.
[0022]
In this state, when the frames A and B are relatively vibrated by an external force such as an earthquake, the friction disks 4a and 4b at the tip of the arms are rotated relatively to the cradle 8 via the pair of arms 2a and 2b. As a result, a predetermined frictional resistance force is generated between the inclined friction surfaces 4c, 4d on the outer periphery of the friction disk and the receiving-side inclined friction surfaces 8a, 8b, whereby the friction between the frame A and the frame B is generated. Damping relative vibration.
[0023]
In this case, the frictional resistance generated between the inclined friction surfaces is detected one by one by the load cell 15, and the detected value is sent to the control device 16, and the motor 9 is driven based on the output signal.
[0024]
The rotation of the motor 9 is transmitted to the worm 7 via the worm gear 6 to rotate the shaft 5.
[0025]
Then, the pair of friction disks 4a and 4b engaged with the shaft 5 via the threaded portion of the inner peripheral edge move in symmetric directions with each other, the friction surface 4c is moved to the friction surface 8a, and the friction surface 4d is moved to the friction surface 8d. Each of the frames A and B is pressed against the friction surface 8b with a predetermined pressing force, and the relative vibration between the frames A and B can be accurately attenuated by the frictional resistance optimum for the generated vibration.
[0026]
FIG. 7 shows the details of the contact portions of both friction surfaces. Assuming that the inclination angle of both friction surfaces 4c and 8a is α and the pushing force of friction disk 4a by shaft 5 is P, friction surfaces 4c and 8a The pressing force Q generated between
Q = P / sinα
Is represented by
[0027]
If the friction coefficient between the two friction surfaces 4c and 8a is constant, the frictional resistance F generated between them is proportional to the pressing force Q. Therefore, by appropriately setting the inclination angle α, a large frictional resistance can be obtained by a small pressing force P. A force F can be obtained.
[0028]
Further, since the pushing force P is amplified and output by the worm gear mechanism, a small motor output is sufficient. In the end, by appropriately controlling the output of the motor 9 by the control device 16 based on the detection value of the load cell 15, Optimal frictional resistance can be generated with high accuracy.
[0029]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a longitudinal sectional front view of a frictional resistance varying device according to a second embodiment, and FIG. 3 is a side view of the same.
[0030]
As shown in the figure, the frictional resistance varying device of the present example includes a pair of arms 2a and 2b supported by a frame B, friction disks 4a and 4b, a shaft 5, and a receiving table 8 supported by a frame A. The configuration and the combination thereof are the same as those in the first embodiment, and the description thereof will not be repeated.
[0031]
In this embodiment, a lever mechanism is employed as a mechanism for moving the friction disk.
[0032]
That is, one end of the lever 12 is attached to the shaft 5 inserted into the inner holes 4e, 4f by engaging the threaded portions at both ends with the left and right screws on the peripheral edges of the inner holes of the friction disks 4a, 4b. The other end of the lever 12 is connected to the actuator 11.
[0033]
As in the first embodiment, a load cell 15 is inserted between the plate 10 and the frame B, and a control device 16 for controlling the output of the actuator 11 based on the detected value of the load cell 15 is provided.
[0034]
The moving mechanism of the friction disk of the present embodiment is configured to rotate the shaft 5 by rotating the lever 12 by expanding and contracting the actuator 11, and the shaft 5 is screwed to the shaft 5 similarly to the first embodiment. The friction disks 4a and 4b are moved in a symmetrical direction with respect to each other, so that the friction surfaces 4c and 4d are pressed against the cradle 8 side friction surfaces 8a and 8b.
[0035]
Thus, the frictional resistance generated between the friction surfaces 4c, 4d and 8a, 8b is detected every moment by the load cell 15, and the detected value is sent to the control device 16, and the output of the actuator 11 is controlled based on the output signal. Thus, an optimal frictional resistance can be generated, and the relative vibration between the frames A and B can be accurately attenuated.
[0036]
Also in this example, the pushing force of the friction surfaces 4c, 4d of the friction disks 4a, 4b against the friction surfaces 8a, 8b on the receiving table 8 side is amplified by the lever mechanism, so that a small actuator output is sufficient. 1, the optimal frictional resistance can be accurately controlled.
[0037]
Next, FIGS. 5 and 6 show an application example of the frictional resistance varying device 1 of the present invention described in the first and second embodiments.
[0038]
FIG. 5 shows a structure composed of columns 23, beams 20, 22 and wall 21, in which device 1 of the present invention is inserted between wall 21 and beam 22 where the connection with column 23 and beam 22 has been released. FIG. 6 shows an apparatus of the present invention between a brace 24 and a beam 22 in which a connection with the beam 22 has been released in a structure composed of columns 23, beams 20, 22 and a brace 24. The vibration of the structure can be effectively attenuated by appropriately arranging a plurality of devices 1 between the respective layers as shown in this application example.
[0039]
【The invention's effect】
As described in detail above, according to the frictional resistance varying device of the present invention, the output of the driving means for the friction disk moving mechanism is controlled based on the detected value of the frictional resistance, thereby generating the device. It is possible to control the frictional resistance force to an optimum value with high accuracy, and thereby effectively attenuate the relative vibration acting between the two frames regardless of the vibration speed.
[0040]
At this time, the two friction surfaces for generating the frictional resistance are inclined, and the moving mechanism is constituted by a worm gear mechanism or a lever mechanism, so that a large frictional resistance can be obtained with a small driving means output. Resistance can be controlled accurately.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view of a frictional resistance varying device according to a first embodiment of the present invention.
FIG. 2 is a side view of the same device.
FIG. 3 is a vertical sectional front view of a frictional resistance varying device according to a second embodiment of the present invention.
FIG. 4 is a side view of the same device.
FIG. 5 is an explanatory view showing an application example of the frictional resistance varying device according to the first and second embodiments of the present invention.
FIG. 6 is an explanatory view showing another application example of the frictional resistance varying device according to the first and second embodiments of the present invention.
FIG. 7 is an operation explanatory view showing details of a main part of the device of the present invention.
FIG. 8 is an explanatory diagram showing a vibration state of a structure to which the present invention is applied at the time of an earthquake or the like.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Variable frictional force 2a, 2b Arm 3 Pin 4a, 4b Friction disk 4c, 4d Friction surface 4e, 4f Inner hole 5 axis (axis with screw)
Reference Signs List 6 worm gear 7 worm 8 cradle 8a, 8b friction surface 9 motor 10 plate 11 actuator 12 lever 15 load cell 16 control device 20, 22 beam 21 wall 23 pillar 24 brace A, B frame

Claims (3)

A pair of arms rotatably supported on one of the two frames that are relatively vibrated are attached to the ends of a pair of arms, respectively, and a friction disk having an inclined friction surface formed on the outer periphery thereof and supported on the other frame A tilted friction surface corresponding to the inclined friction surface of the friction disk is formed therein, and the inclined friction surfaces are brought into contact with each other to form a cradle in which the friction disk is stored in the internal space. A mechanism for moving the pair of friction disks in a symmetrical direction so that the inclined friction surfaces come into contact with each other, and a driving means therefor; a means for detecting a frictional resistance generated between the inclined friction surfaces; Means for controlling the output of the driving means so that the force becomes a predetermined value. The friction disc moving mechanism is provided with an inner hole in the center of the pair of friction discs, engraving a left screw and a right screw on the peripheral edge thereof. 2. A friction device according to claim 1, further comprising a worm supported by a shaft provided with a screw engaged with said worm, and a worm gear mechanism comprising a worm gear engaged with said worm and rotated by said driving means. Variable resistance device. The friction disk moving mechanism is provided with an inner hole at the center of the pair of friction disks, and engraving left and right screws on the periphery thereof, and each screw of the inner hole peripheral edge on the outer periphery of both ends. 2. A frictional resistance according to claim 1, wherein said shaft is provided with a screw on which said screw is engaged, said lever is constituted by a lever having one end connected to said shaft and said lever connected to said drive means at the other end. Variable device.

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