JP3605176B2 - Vertical active damping device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a vertical active vibration damping device that is used by being attached to a structure to be damped and that suppresses vertical vibration of the structure.
[0002]
[Prior art]
As a conventional vertical damping device, for example, there is one as shown in a side view of FIG. In this vibration damping device, a movable frame 04 having one end rotatably supported by a horizontal axis 03 is provided on a horizontal fixed frame 02 fixed between main beams 01 of a bridge or the like. A weight 05 is fixed on the upper portion to form a vibrator, and a vibration absorbing mechanism 08 including a vertical spring 06 and a hydraulic damper 07 is connected between the movable frame 04 and the horizontal fixed frame 02. I have.
[0003]
With such a configuration, when a vertical vibration is generated in a bridge or the like, the vibration causes the movable frame 04 to which the weight 05 is fixed to move up and down on the other end side around the horizontal axis 03, and this vibration is generated. Vibration shock between the hour weight 05 and the movable frame body 04 is absorbed by a vibration absorbing mechanism 08 including a spring 06 and a hydraulic damper 07, so that vertical vibration of a structure such as a bridge is attenuated.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional vertical damping device, a spring 06 and a hydraulic damper 07 having a constant strength which are adjusted in advance in accordance with a vibration cycle (acceleration) of a structure to be damped are usually used. That is, since the vibration absorbing mechanism 08 having a constant strength is used for the vertical vibrations having different intensities generated in the structure to be damped, it is impossible to uniformly suppress all the vertical vibrations generated in the structure. Can not.
[0005]
On the other hand, in a horizontal vibration damping device, in order to overcome this drawback, a horizontal driving mechanism is engaged with a horizontal vibrating body (weight), and the same driving force is applied in the same direction according to the horizontal vibration speed generated in the structure. In the meantime, a method of actively canceling vibration energy by moving a driving body has begun to be used, but a device having such a mechanism has not yet been developed as a vertical vibration damping device.
[0006]
Further, in the case of a horizontal vibration damping device using the horizontal drive mechanism for the vibrating body, there is a problem that the whole device is generally large due to the vibrating body and the horizontal drive mechanism, and a large installation space is required.
[0007]
In view of the above situation, the present invention is a compact device that includes a vibration absorbing mechanism that passively absorbs vertical vibration and a vibration mechanism that actively suppresses vibration energy in a vertical vibration damping device. Proposed for the purpose of obtaining.
[0008]
[Means for Solving the Problems]
Therefore, the present invention provides a vibrating body held by an arm, a vibration absorbing mechanism for absorbing vertical vibration of the vibrating body, a ball screw for vertically reciprocating the vibrating body by moving the arm up and down, and the ball screw. And a vibrating mechanism including a motor for rotating the motor. Further, a nut portion mounted via a universal bearing for mounting a ball screw on the arm portion is made movable, a structure provided with a string-proof material for restricting a vertical swing stroke of the arm portion, and a vibration damper. An arrangement is also provided in which the device is fixed on top of a structure.
[0009]
That is, the present invention provides (1) a vibrating body which is held via a arm so as to be able to move up and down with respect to a structure to be damped, and connected between the arm of the vibrating body and the structure; A vibration absorbing mechanism for absorbing vibration in the vertical direction of the body, and screwed to a nut mounted on an arm of the vibrating body via a universal bearing, and with respect to the structure side so as to be juxtaposed to the vibration absorbing mechanism. The arm portion is provided in the vertical direction, and the arm portion is vertically moved by rotating, and the ball screw for vertically moving the vibrating body held in the arm portion and the ball screw are rotated, and according to the vibration cycle of the structure. A vibration mechanism comprising a motor for moving the arm part up and down, and a nut part mounted via the universal bearing, and a universal bearing supported on the arm part of the vibrating body so as to be freely movable in the arm part longitudinal direction. , Provided on the universal bearing Providing vertical active vibration suppression apparatus, characterized in that it is constituted by a nut portion rotatably provided via a trunnion shaft to the pair of bearing portions that.
[0010]
(2) Further, in the above (1), the arm portion is provided with a string-proofing material at the vertical stroke end portion of the arm portion on the structure side of the vibrating body holding portion. A directional active vibration damper is provided.
[0011]
(3) In addition, vertical active, characterized by comprising configured in the upper fixed as Oite in the above (1) or (2), the vibration damping apparatus is suspended from the top of the structure Provide a vibration damping device.
[0012]
[Action]
In the invention of the above (1) according to the present invention, when the vibrating body which is held on the structure via the arm so as to be able to move up and down moves up and down by the vibration of the structure, the vibration connected between the arm and the structure. Absorbing mechanism, for example, a spring, hydraulic damper, etc. passively absorbs the vertical vibration energy of the upper and lower structures, and at the same time, detects the vertical vibration speed generated on the structure with, for example, a speedometer and responds to this with a control device etc. And outputs the control signal to the drive motor to drive the ball screw, and the arm moves up and down .
[0013]
Vibrator to cancel the vertical vibration energy of the up and down has been structure in accordance with the vertical vibration generated in the structure by Re it.
[0014]
Therefore, the apparatus can always suppress the vertical vibration with the suppressing force corresponding to the vertical vibration generated in the structure. Further, by adjusting the length adjustment of the arm portion holding the vibrating body, the vibration period of the vibrating body can be easily adjusted. Further, since the vibration absorbing mechanism, the ball screw and the drive motor can be arranged in the direction orthogonal to the arm, the apparatus can be made extremely compact.
[0015]
Further, in the invention of (1), self-standing bearing is movable in the longitudinal direction of the arm portion, a nut portion for supporting the ball screw via a trunnion shaft portion into the bearing portion provided to the swivel connection Accordingly, the rotation of the ball screw causes the arm to easily turn up and down, and vibrates the vibrating body held by the arm, thereby suppressing the vertical vibration with high accuracy.
[0016]
According to the invention of ( 2 ), the same operation and effect as those of the above-mentioned (1 ) are obtained, and the arm portion is moved when the vibrating body is shaken excessively because the string-proof material is provided on the structure side. Is absorbed by the string bar to absorb the shock and relieve the shock, thereby maintaining the safety of the device.
[0017]
According to the invention of ( 3 ), the same function and effect as described above can be obtained, and since the vibration damping device is fixed at the upper portion, the range of choice of the device to the structure can be expanded without being restricted to fixing at the lower portion, and the degree of freedom of mounting can be increased. Is growing.
[0018]
【Example】
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a vertical active damping device according to one embodiment of the present invention. In the drawing, 1 is a vibration damping device, 2 is a speedometer attached to a structure 3 to be damped, 4 is a control signal to be input in response to a signal 2a of a speed detected by the speedometer 2 and to be damped according to the detected speed. This is a control device that outputs 4a and controls the vibration of the vibrating body 8 of the vibration damping device 1.
[0019]
The vibration damping device 1 includes a frame 5 for unitizing the device, an arm 7 having one end rotatably mounted on the frame 5 so as to be rotatable about a horizontal shaft 6, and a length adjustable at the tip of the arm 7. A vibrating body 8 of a predetermined weight held, a vibration absorbing mechanism 11 composed of a spring 9 and a hydraulic damper 10 connected in parallel up and down between the frame 5 and the arm 7, and a nut 12 supported on the arm 7. The ball screw 13 is screwed and provided in the frame 5 in the vertical direction, and a vibration mechanism 15 including a servomotor 14 for driving the ball screw.
[0020]
FIG. 2 is a side view of a specific example in which the vibration damping device 1 of FIG. 1 is enlarged, and FIG. 3 is a plan view along the line AA of FIG. FIGS. 2 and 3 show a case where the frame 5 is provided with a mounting portion 5a for the upper structure 3 and is fixed to the structure 3 to be damped at the upper portion. Reference numeral 5b denotes an opening on the left side of the frame 5 for ensuring the vertical movement of the vibrating body 8, and reference numeral 16 denotes an arm 7 to be received by the horizontal members 5c and 5d of the upper and lower frames 5 forming the opening 5b. It is a string protection material provided in.
[0021]
As shown in FIG. 3, the arm 7 is formed in a bifurcated shape with a large gap on the connecting side of the horizontal shaft 6 and a small gap on the tip end, and a free bearing 17 is provided inside the arm 7 with a small gap near the tip. The nut part 12 is supported by the bearing 17.
[0022]
The ball screw 13 screwed to the nut portion 12 has an end supported by upper and lower bearings 18 and 19 on the frame 5, and a gear box 20 having a shaft end extending through the lower bearing 19 provided at the bottom of the frame 5. Is connected to the drive shaft of the servomotor 14 via the.
[0023]
A pair of springs 9 are arranged on both outer sides of the bifurcated arm 7 having a small interval, and a cylinder-type frame 22 having a lower end supported by a shaft 21 on the arm 7 side, and a shaft 23 having one end mounted on the ceiling of the frame 5. And a rod 24 which extends through the upper end plate 22a of the cylinder type frame 22 so as to extend and contract into the cylinder type frame 22. And a coil spring 25 held and mounted on the lower surface of the upper end plate 22a of the mold frame 22.
[0024]
A pair of hydraulic dampers 10 are connected in parallel in the vertical direction between the symmetrical position of the forked arm 7 and the upper surface of the frame.
[0025]
4 is a sectional view taken along the line BB of FIG. 3, and FIG. 5 is a sectional view taken along the line CC of FIG. The universal bearing 17 is provided with a seat plate 28 having an opening 26 in the center and a moving roller 27 on both side edges on a guide portion 31 of the arm portion 7, fixed on the seat plate 28, and connected to the opening 26. It comprises a pair of bearing portions 29 provided facing each other, and a guide portion 31 formed at an opposing portion of the arm portion 7 and having a groove 30 for loosely fitting with the roller 27 of the seat plate 28.
[0026]
The nut portion 12 supports the pair of trunnion shaft portions on the pair of bearing portions 29 so as to be free to tilt within the opening 26 and to be movable by a fixed distance in the longitudinal direction of the arm portion 7 via the universal bearing 17. The arm 7 can freely rotate up and down under the state of being screwed with the ball screw 13.
[0027]
The vibration absorbing mechanism 11 may be constituted by only one of the spring 9 and the hydraulic damper 10, and the shape and the like of the vibration damping device 1 may be further appropriately changed.
[0028]
The above-described apparatus is configured such that a plurality of units are distributed and arranged on a structure 3 which easily generates vertical vibration, such as a bridge, such as an upper mounting type as shown in FIGS. And can be mounted.
[0029]
According to such a device, when a vertical vibration is generated in the structure 3 to be damped, such as a bridge, by wind or earthquake, the vertical vibration is caused by the vibration absorbing mechanism 11 composed of the spring 9 and the hydraulic damper 10. Is absorbed by the passive passive function, and at the same time, the signal 2a of the vertical vibration velocity of the structure 3 is detected by the speedometer 2 and input to the control device 4, and the control device 4 receives the signal 2a from the servo motor 14 and the ball screw 13. An active function of outputting a control signal 4a to the vibrating mechanism 15 to rotate the ball screw 13 in response to the output signal to actively vibrate the vibrating body 8 in the vertical direction at a speed corresponding to the detected vibration speed. Cancels the structure vibration. That is, the vertical vibration generated in the structure 3 is damped by both the passive function of the vibration absorbing mechanism 11 and the active function of the vibrating mechanism 15.
[0030]
Therefore, the vibration generated in the structure 3 can provide a high damping effect in a wide range from a low wind speed range to a high wind speed range, and is also effective against earthquake motion.
[0031]
The use of the cantilever type vibrating body 8 using the arm portion 7 makes it easy to adjust the vibration period by adjusting the arm length and the arm mounting position of the spring 9. The drive unit 9, the hydraulic damper 10, and the ball screw 13 drive system of the vibrating mechanism 15 can be arranged in parallel in the direction crossing the arm 7, so that the apparatus unit can be made extremely compact, and the apparatus can be arranged in a dispersive manner, In addition, the burden of reinforcement on the structure side can be reduced by distributing and arranging small devices easily.
[0032]
Further, since the vibrating body 8 having a larger mass weight than the size of the apparatus is provided, and a large vibration stroke can be obtained, the vibration damping performance per unit is improved.
[0033]
Also, as shown in the above embodiment, the device unit can be fixed to the structure 3 at the upper side or at the lower side, so that the device can be easily attached to the structure 3 and the mounting is easy. When the vibrating body 8 is shaken excessively during the active vibration of the vibrating body 8, the string protection member 16 absorbs the shock and reduces the shock to the unit frame 5 and the structure 3. Equipment safety can be maintained.
[0034]
In addition, when the vibration mechanism performs an automatic operation that is a brake operation in an emergency, it is possible to prevent danger at the time of failure of the vibration damping device.
[0035]
【The invention's effect】
As described above in detail, according to the present invention, the vibrating body held by the arm portion, the vibration absorbing mechanism for absorbing the vertical vibration of the vibrating body, and the vibrating body A ball screw for reciprocating the ball screw up and down and a vibration mechanism comprising a motor for rotating the ball screw are provided, and the nut mounted on the arm is moved via a universal bearing for mounting the ball screw. The following effects are also provided by providing a flexible configuration, a configuration in which a string bar is provided to limit the vertical swing stroke of the arm, and a configuration in which the vibration damping device is fixed on the top of the structure. Things.
[0036]
(1) Passive function that passively absorbs the energy of vertical vibration generated in the structure by wind or earthquake due to the vibration absorption mechanism, and activates the vibrator according to the vibration speed of the structure by the vibration mechanism And the active function of offsetting the vertical vibration energy of the structure by simultaneously moving it up and down to prevent vibration, and to be able to measure vibrations efficiently in each vertical vibration range from low wind speed range to high wind speed range The effect of realizing vibration suppression was achieved.
[0037]
(2) In addition, the nut portion is rotatably supported via a trunnion shaft portion on a pair of bearing portions which are supported by the arm portion of the vibrating body so as to be movable in the longitudinal direction of the arm portion. Regardless of the movement, the nut portion can be freely screwed with the ball screw, thereby enabling rapid vibration of the vibrating body.
[0038]
(3) The configuration of the apparatus can be made extremely compact, the distributed arrangement of the apparatuses and the selection of the mounting location can be facilitated, and the load of reinforcement on the structure side can be reduced by the distributed arrangement.
[0039]
(4) Also, since a string-preventing material that engages with the vibrating body is provided on the frame or the structure side at the end of the oscillating stroke of the vibrating body, the shock at the time of unexpected collision of the vibrating body with the structure side can be reduced. Danger can be prevented.
[0040]
(5) Further, since the vibration damping device is configured so as to be used in a fixed manner at the upper portion, there is an effect that the degree of freedom in mounting the device is increased in distributing and arranging the device, and the mounting is facilitated. is there.
[Brief description of the drawings]
FIG. 1 is a side view showing an entire vertical active damping device according to an embodiment of the present invention.
FIG. 2 is a detailed side view of the vibration damping device of the embodiment shown in FIG.
FIG. 3 is a view taken in the direction of arrows AA in FIG. 2;
FIG. 4 is a sectional view taken along line BB in FIG. 3;
FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;
FIG. 6 is a side view of a conventional vertical damping device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vibration suppression device 2 Speedometer 3 Structure 4 Control device 5 Frame 6 Horizontal axis 7 Arm part 8 Vibrating body 9 Spring 10 Hydraulic damper 11 Vibration absorption mechanism 12 Nut part 13 Ball screw 14 Servo motor 15 Vibration mechanism 16 String protection Material 17 Swivel bearings 18 and 19 Bearings 21 and 23 Shaft 22 Cylinder frame 24 Rod 25 Coil spring 26 Opening 27 Roller for movement 28 Seat plate 29 Bearing part

Claims (3)

A vibrating body held via an arm portion so as to be vertically movable with respect to a structure to be damped, and connected between the arm portion of the vibrating body and the structure to absorb vertical vibration of the vibrating body A vibration absorbing mechanism, which is screwed to a nut part mounted on an arm part of the vibrating body via a universal bearing, and is provided in a direction perpendicular to the structure side so as to be juxtaposed with the vibration absorbing mechanism and rotates. By moving the arm part up and down, a ball screw for vertically reciprocating the vibrating body held by the arm part and a motor for rotating the ball screw and moving the arm part up and down according to the vibration cycle of the structure. And a nut mounted via the universal bearing, a nut supported on the arm of the vibrating body so as to be movable in the longitudinal direction of the arm, and a pair provided on the universal bearing. To the bearing Vertical active vibration suppression apparatus, characterized in that it is constituted by a nut portion rotatably provided via a trunnion shaft portion. The vertical active vibration damping device according to claim 1 , wherein a string-proof material is provided at an end of a vertical swing stroke of the arm portion on the structure side of the vibrating body holding portion of the arm portion . The vibration damping device vertically active vibration damping device according to claim 1 or claim 2, characterized in that configured on the upper fixed to suspended from the top of the structure.

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