JP6910111B2 - Vibration control device and vibration control system - Google Patents

Description

The present invention is, for example, can be used as a long-period ground motion countermeasures of high-rise buildings, to an adjustable damping device and damping system damping.

Various vibration damping devices have been developed as earthquake countermeasures for buildings such as skyscrapers. The vibration damping device mainly includes a passive type, an active type and a semi-active type. The passive method does not require energy such as electric power, and attenuates the vibration of the building based on the damping characteristics of the oil damper and the like. Therefore, stable performance can be exhibited without being affected by a power failure or the like.
In the active method and the semi-active method, the vibration of the building is detected by a sensor, and the vibration damping damper or the like is controlled by electricity or the like based on the detection result to attenuate the vibration.

As an active type vibration damping device, for example, those described in Patent Documents 1 to 3 have been proposed. The damping device described in Patent Document 1 includes a housing connected to a base and a screw rod connected to a structure, and a rotor screwed to the screw rod is rotatably supported in the housing. A viscous fluid is sealed in the working chamber that forms the gap between the housing and the rotor, and the rotor can be rotated by an electric motor.
Then, when a relative vibration occurs between the base and the structure, the screw rod moves forward and backward in the axial direction, and the rotor rotates in the forward and reverse directions accordingly, so that the viscous fluid in the working chamber generates heat and vibrates. Vibration energy is attenuated by converting energy into thermal energy.

In the vibration damping device described in Patent Document 2, a vibrating body is suspended from a structure via a cord, a nut portion is rotatably supported under the vibrating body, and a ball screwed into the nut portion. The end of the screw is supported so as to be swingable in the vertical direction via a pin joint. Then, the motor fixed to the vibrating body rotates the nut portion to reciprocate the vibrating body according to the vibration cycle of the structure, thereby suppressing the vibration of the structure.

Further, in the vibration damping device described in Patent Document 3, when the vibrating body is driven by shifting the phase with respect to the vibration of the vibration-damping object to suppress the vibration of the vibration-damping object, the wedge is moved downward by the spring. By doing so, the vibrating body is locked via the brake pad. Moreover, it is provided with a first actuator that locks the wedge in the raised position and a second actuator that lifts the lowered wedge and returns it to its original position.

Japanese Patent No. 501608 Japanese Unexamined Patent Publication No. 3-134339 Japanese Unexamined Patent Publication No. 3-249442

However, in the damping device described in Patent Document 1, since the rotation torque given to the rotor by the earthquake is increased or decreased by the rotation torque of the electric motor, the magnitude of the damping force of the damping device is relative to the base and the structure. It is affected by both the typical vibration speed and the magnitude of the rotational torque of the electric motor, and has the drawback of requiring complicated control in order to control the value of the damping force.

Further, in the vibration damping devices described in Patent Documents 2 and 3, the nut portion is rotated by a motor to reciprocate the vibrating body according to the vibration cycle of the structure to suppress the vibration of the structure. Had to be installed. In Patent Document 3, a brake pad and its advancing / retreating mechanism must be provided in order to prevent the vibrating body from being further moved and damaging the structure, which has a drawback that the mechanism becomes more complicated.

The present invention has been made in view of such circumstances, to provide a vibration control device and a damping system which make it possible to provide a restoring force and any damping force in the damping damper with a simple structure The purpose is.

The shaft length variable device according to the present invention includes a ball screw that holds the screw shaft and allows the screw shaft to be relatively advanced and retracted by rotation to adjust the length, and a vibration damping damper connected in series with the ball screw. It is characterized by being prepared.
According to the present invention, the damping force generated by the vibration damping damper is increased or decreased by adjusting the length of the ball screw by relatively advancing and retreating the screw shaft by the rotation of the ball screw to expand and contract the vibration damping damper. Can be done.

The vibration damping device according to the present invention is a vibration damping device interposed between a first member and a second member that can be displaced relative to each other in a building, and is screwed to the screw shaft and the screw shaft and rotated to rotate the screw. By moving the shaft relatively forward and backward, the rotating body that adjusts the amount of advance and retreat of the screw shaft with respect to the reference position, the support guide portion that holds the rotating body rotatably, and the rotating body are rotationally driven. A drive source and a vibration damping damper connected in series with the screw shaft or the support guide portion are provided , and the reference position is the end of the support guide portion on the screw shaft protruding side on which the screw shaft protrudes. The distance between the first member and the second member can be adjusted by adjusting the amount of advance / retreat of the screw shaft, which is determined so as to be relative to the portion or the end of the rotating body on the protruding side of the screw shaft. It is characterized by.
According to the present invention, the screw shaft or the support guide portion and the vibration damping damper are connected in series between the first member and the second member, and the screw shaft is relatively moved forward and backward by the drive of the drive source to move the screw shaft. By adjusting the length between the rotating bodies and expanding and contracting the vibration damping damper, the damping force generated by the vibration damping damper can be increased or decreased, and the vibration of the building can be suppressed.

Further, one of the screw shaft and the support guide portion may be connected to the vibration damping damper, and the other may be connected to either the first member or the second member.
The length of the ball screw can be increased or decreased by moving the screw shaft of the ball screw relatively forward or backward.

Further, the drive source is fixed to the support guide portion, the screw shaft is connected to the vibration damping damper, the support guide portion is connected to either the first member or the second member, and the screw. The length may be adjustable between the vibration damping damper and the support guide portion by adjusting the amount of advance / retreat of the shaft.

The vibration damping system according to the present invention uses the vibration damping device described in any of the above, the vibration sensor for detecting the vibration of the building, and the rotation by the drive source according to the magnitude of the vibration detected by the vibration sensor. It is characterized by including a control unit for adjusting the amount of advancement and retreat.
According to the vibration damping system according to the present invention, the damping force generated by the vibration damping damper is increased or decreased by expanding and contracting the vibration damping damper by adjusting the advancing / retreating amount in the control unit according to the magnitude of the vibration detected by the vibration sensor. It can be adjusted and the vibration of the building can be suppressed.

According to the vibration damping device and the vibration damping system according to the present invention, since the vibration damping damper is connected in series with the screw shaft or the support guide portion, the amount of advance / retreat of the screw shaft is adjusted according to the magnitude of vibration in the event of an earthquake or the like. By expanding and contracting the vibration damping damper, it is possible to apply an arbitrary damping force and restoring force to the vibration damping damper, so that efficient vibration control can be performed with a simple configuration.

It is explanatory drawing of the main part which attached the vibration damping system by embodiment of this invention to a building. It is a figure which shows the structure of the vibration damping device by embodiment of this invention, (a) is the figure which shows the structure which connected the Y-shaped brace, (b) is the figure which shows the structure which connected one brace. FIG. 3 is an enlarged cross-sectional view of a main part showing the vibration damping device shown in FIG. 2 (a). It is an enlarged view of the main part of the shaft length variable device of the vibration damping device shown in FIG. It is a figure which shows the configuration example of the vibration damping device. (A), (b), and (c) are diagrams showing the time history of the amplitude of the deformation speed of the shaft in the vibration damping device. (A), (b), and (c) are diagrams showing the relationship between the damping force corresponding to FIGS. 6 (a), (b), and (c) and the deformation speed of the vibration damping damper.

Hereinafter, the vibration damping device of the vibration damping system according to the embodiment of the present invention will be described with reference to the accompanying drawings.
The vibration damping system 5 shown in FIG. 1 is a plurality of vibration damping devices 1 attached to, for example, a lower layer of a high-rise or super-high-rise building BL, and vibration of the building BL attached to an appropriate layer of the building BL. A plurality of vibration sensors 6 for detecting the above, and a control unit 7 for operating and controlling the vibration damping device 1 based on the detection result of the vibration sensor 6 are provided. The vibration damping system 5 detects and records the vibration of the building BL by each vibration sensor 6, and the control unit 7 calculates the control force according to the detection result. Then, the damping of the vibration of the building BL is controlled by each vibration damping device 1 according to the output of the calculation result. The location where the vibration damping device 1 is installed is not limited to the low-rise portion, and may be installed in any layer.

As shown in FIGS. 2A and 2B, the vibration damping device 1 is interposed between two relative displaceable members of the building BL. The building BL has, for example, a large number of space 4 of a frame partitioned by a beam 2 and a beam 3 and a pillar P on one floor in the vertical and horizontal directions. The two members on which the vibration damping device 1 is installed are, for example, the upper end portions (upper end corner portions) of the pillars P1 (P) and P2 (P) facing each other in the space 4 and the lower end portion (lower end corner portion) of the pillar P2, or facing each other. The first member and the second member are composed of the upper end portion (upper end corner portion) and the lower end portion (lower end corner portion) of the columns P1 and P2.
The vibration damping device 1 includes a shaft length variable member 10 (shaft length variable device) composed of an electric actuator whose length is adjustable so that the length in the axial direction (length direction) extending between the connecting portions with respect to the two members is variable. It is provided with a vibration damping damper 11 as a damping portion having damping characteristics in the axial direction. The vibration damping device 1 is configured by connecting the variable shaft length member 10 and the vibration damping damper 11 in series in the axial direction. The variable shaft length member 10 and the vibration damping damper 11 may be separate or integrated with each other.

One end of the vibration damping device 1A (1) shown in FIG. 2A is connected to the top (lower end) Br1a of the Y-shaped brace Br1 extending between the upper ends of the pair of columns P1 and P2 in the space 4 of the building BL. Has been done. The vibration damping device 1A is arranged, for example, substantially horizontally between the top Br1a of the Y-shaped brace Br1 and the base P2a of the pillar P2 of the building BL. Both ends of the vibration damping device 1A are connected to the top Br1a and the pillar P2, respectively.
The vibration damping device 1A shown in FIG. 2A is composed of a shaft length variable member 10 and a vibration damping damper 11, but the shaft length variable member 10 and the vibration damping damper 11 are provided via a connecting member extending in the axial direction. At least one of the above may be connected to the corresponding ones of the top Br1a and the pillar P2. Alternatively, both ends of the shaft length variable member 10 and the vibration damping damper 11 may be connected to the top Br1a and the pillar P2 via a connecting member.

Further, the vibration damping device 1B (1) shown in FIG. 2B is connected to an intermediate portion of a single brace Br2 extending between the upper and lower ends of a pair of columns P1 and P2 in the space 4 of the building BL. The vibration damping device 1B is composed of a shaft length variable member 10 and a vibration damping damper 11, and is connected between an upper brace member Br2a and a lower brace member Br2b that vertically divide one brace Br2. The vibration damping device 1B is arranged so that the axial direction substantially coincides with the axial direction (longitudinal direction) of the single brace Br2.
Both ends of the vibration damping device 1B are connected to the ends of the upper and lower brace members Br2a and Br2b on the brace center side, respectively. The vibration damping device 1B shown in FIG. 2B is composed of a shaft length variable member 10, a vibration damping damper 11, and an upper brace member Br2a and a lower brace member Br2b connected to both ends thereof. One of the brace members Br2a and Br2b may be eliminated.

Next, the specific configuration of the shaft length variable member 10 and the vibration damping damper 11 of the vibration damping device 1 will be described with reference to FIGS. 3 and 4, but in FIGS. 3 and 4, the Y-shaped brace Br1 shown in FIG. The attached vibration damping device 1A will be described as an example.
The shaft length variable member 10 shown in FIGS. 3 and 4 is, for example, an electric actuator. According to the shaft length variable member 10, a ball screw 12 arranged in the axial direction, a cylindrical support guide portion 13 provided on the outer peripheral surface of the ball screw 12 and capable of relative rotation, for example, and a support guide portion. It is provided with a drive motor M which is fixed to the outer peripheral surface of the 13 and serves as a drive source for rotationally driving the ball screw 12.
The ball screw 12 includes a ball nut 14 as a rotating body and a ball nut 14 in which a main body portion 14a having a substantially cylindrical shape and a disk-shaped rotating gear 14b whose diameter is expanded at one end thereof are integrally formed. It has a screw shaft 15 attached to a through hole 14c coaxial with the central axis O so as to be able to advance and retreat.

A spiral ball rolling groove 15a having a substantially semicircular cross section is formed on the outer peripheral surface of the screw shaft 15, and the ball 16 is rotatably arranged in the ball rolling groove 15a. The through hole 14c for fitting the screw shaft 15 of the ball nut 14 in a relative rotatable manner has a substantially semicircular cross section and a spiral shape, and a groove portion in which the ball 16 in the ball rolling groove 15a is rotatably fitted. 14d is formed as a rotation transmission part. One end of the screw shaft 15 protrudes from one end of the ball nut 14 and is fixed to a fixing plate 17 connected to one end of the vibration damping damper 11, and the other end protrudes from the other end of the ball nut 14. ing.
The ball screw 12 is formed with an infinite circulation path 18 for circulating the ball 16 that has rolled in the ball rolling groove 15a of the screw shaft 15. Therefore, the ball nut 14 and the screw shaft 15 form a ball screw 20, and the screw shaft 15 of the ball screw 20 can move forward and backward along the central axis O by the rotation of the ball screw 12.

Further, a substantially ring-shaped groove portion 14e and a groove portion 13a for rolling with the ball 16 sandwiched between the outer peripheral surface of the main body portion 14a of the ball nut 14 and the inner peripheral surface of the support guide portion 13 are formed and supported, respectively. The ball nut 14 can rotate about the central axis O with respect to the guide portion 13. A flange portion 13b whose diameter is expanded outward in the radial direction is formed at an end portion of the support guide portion 13 opposite to the rotary gear 14b, and this flange portion 13b is fixed to the top portion Br1a of the Y-shaped brace Br1. Therefore, the support guide portion 13 does not rotate.

A drive motor M is attached to the outer peripheral surface of the support guide portion 13, and the output gear 21 fixed to the output shaft thereof meshes with the rotary gear 14b of the ball nut 14. It is preferable to use a speed reducer for the output gear 21. By rotating the ball nut 14 via the rotary gear 14b by the rotation of the drive motor M, the screw shaft 15 can move forward and backward in the central axis O direction.
Since the other end of the screw shaft 15 is retracted inward from the flange portion 13b of the support guide portion 13, the ball is advanced or retracted to the vibration damping damper 11 side by the forward and reverse rotation of the drive motor M. The length of the screw 12 in the central axis O direction can be expanded and contracted. The vibration damping damper 11 is compressed by advancing the screw shaft 15, and is extended by retracting it. Moreover, by controlling the magnitude and direction of the current flowing through the drive motor M with the control unit 7, the screw shaft 15 can be moved forward and backward with respect to the ball nut 14, and the shaft length of the entire ball screw 12 can be actively controlled. Can be done.

Next, the vibration damping damper 11 shown in FIG. 3 has a predetermined damping characteristic in the axial direction, and an oil damper, a viscous damper, a viscoelastic damper, a steel damper, a friction damper, or the like is used. That is, various commercially available vibration damping dampers can be used. The vibration damping damper 11 may be composed of a connecting member having damping characteristics in the axial direction and any of the upper and lower brace members Br2a and Br2b.
The brace connecting the vibration damping device 1 is not limited to the Y-shaped brace Br1 and the one-sided brace Br2, and may be in another form such as an X-shaped brace or a V-shaped brace.

The shaft length variable member 10 changes the damping characteristic of the vibration damping device 1 including the vibration damping damper 11 by changing the axial length of the ball screw 12. For example, by extending the screw shaft 15 of the ball screw 12 to compress or extend the vibration damping damper 11, energy can be stored against vibration in either direction, and the vibration is attenuated in the event of an earthquake or the like. be able to. The axial directions of the shaft length variable member 10 and the vibration damping damper 11 are the same.
The shaft length variable member 10 is inserted in series between the building BL and the vibration damping damper 11, and the axial length of the ball screw 12 is changed according to the vibration of the building BL. The transmission load between the members can be arbitrarily changed, and the characteristics of the vibration damping damper 11 can be arbitrarily changed to effectively suppress the vibration of the entire building BL.

The vibration damping device 1 and the vibration damping system 5 according to the present embodiment have the above-described configuration, and the operation thereof will be described next.
The vibration damping system 5 according to the present embodiment shown in FIGS. 1 and 2 detects the vibration of the building BL by the vibration sensor 6 in the event of an earthquake or the like, and the control unit 7 is based on the vibration data obtained by the vibration sensor 6. Controls the operation of the shaft length variable member 10 of the vibration damping device 1.
That is, the screw shaft 15 of the shaft length variable member 10 (electric actuator) is expanded and contracted with respect to the ball screw 12 in consideration of the load and efficiency on the building BL in response to the vibration of the building BL. When the screw shaft 15 is extended, the vibration damping damper 11 is contracted with respect to the reference position via the fixing plate 17, and when the screw shaft 15 is contracted, the vibration damping damper 11 is extended via the fixing plate 17. .. Since the vibration stroke of the vibration damping damper 11 can be expanded and contracted, it is possible to disable or increase or decrease the load transmission between the two members.

For example, by passing a current through the drive motor M of the variable shaft length member 10, the ball nut 14 of the ball screw 12 is rotated in the forward and reverse directions, so that the screw shaft 15 is advanced and retracted between the support guide portion 13 and the screw shaft 15. The axial length of the ball screw 12 of the above is expanded and contracted. As a result, the load transmission between the two members due to an earthquake or the like is arbitrarily increased or decreased by changing the speed and amount of shaft deformation of the vibration damping damper 11 pressed by the screw shaft 15.
When the building BL vibrates in the event of an earthquake or the like, the vibration damping device 1 is controlled based on the vibration data obtained by the vibration sensor 6 to expand and contract the shaft length variable member 10, thereby performing an active vibration damping action. It is possible to perform more effective vibration control than passive vibration control by comprehensively considering the burden on the building BL and efficiency.

The damping characteristics of the entire vibration damping device 1 can be changed by expanding and contracting the shaft length variable member 10 (electric actuator) at an arbitrary timing.
For example, as shown in the vibration damping device of FIG. 5, the displacement amount Dd of the shaft of the vibration damping damper 11 is the sum of the relative displacement δ of the pillar P of the building BL and the displacement amount Ad of the shaft of the shaft length variable member 10. Become. When the displacement amount Ad of the shaft length variable member 10 is zero, the values of the relative displacement δ and the displacement amount Dd match, and the vibration damping damper 11 has the same operation as in the case of passive vibration damping. In this case, FIG. 6A shows the time history of the amplitude of the deformation speed Dv of the shaft generated by the vibration damping damper 11 in response to the vibration of the building BL, and is a sine curve according to the magnitude of the vibration speed. It changes along the waveforms a and b. The damping force in this case fluctuates as shown in FIG. 7 (a).
In the above case, the relative displacement δ of the columns P of the building BL corresponds to the inter-story displacement. The vibration damping damper 11 generates a larger damping force (axial force) as the deformation speed (damper deformation speed) increases. That is, when the vibration damping damper 11 is used alone, the deformation of the building becomes large, and when the damper deformation speed becomes large, a large damping force is generated.

On the other hand, in the active vibration damping device 1 according to the present embodiment, the vibration sensor 6 detects the vibration and the control unit 7 controls the expansion and contraction of the screw shaft 15 of the ball screw 12. In this case, as shown in FIG. 6B, in the range where the inter-story displacement of the building BL is within a predetermined amplitude, the deformation speed of the vibration damping damper 11 which becomes a waveform a unless actively controlled is set to the vibration damping damper. By controlling the expansion and contraction of the axial length variable member 10 so that the deformation speed of 11 becomes the waveform ACT-a, the damping force can be increased regardless of the interlayer displacement (see FIG. 7B). In this case, since the stress of the beam 2, the beam 3, and the column P due to the occurrence of the interlayer displacement is small, there is no problem even if the additional stress from the vibration damping device 1 increases.

On the other hand, when the interlayer displacement of the building BL is large and the stress of the beam 2, the beam 3, and the column P generated at the time of the maximum interlayer displacement is close to a predetermined limit stress, this is detected by the vibration sensor 6. The control unit 7 sets the length of the screw shaft 15 of the ball screw 12, extends (advances and retreats) the screw shaft 15 so as to have a desired length, and presses the vibration damping damper 11 at a predetermined speed. Then, the axial force of the vibration damping damper 11 is generated as if energy was stored in the vibration damping damper 11.
Therefore, as shown in FIG. 6 (c), the deformation speed of the vibration damping damper 11 which becomes the waveform b if not actively controlled is changed to the one-way vibration in which the relative deformation increases in 1/2 cycle of the waveform b. By pressing with the screw shaft 15, the damping force of the vibration damping damper 11 is reduced, and the damping force of the vibration damping damper 11 is amplified when the stress of the beam 2, the beam 3, and the column P deviating from the maximum deformation is reduced. Further, at the time of vibration in the other direction in which the relative deformation increases in the remaining 1/2 cycle, the damping force of the damping damper 11 is similarly reduced by contracting the screw shaft 15 to reduce the deformation speed of the damping damper 11. It is reduced, and the damping force of the damping damper 11 is amplified when the deformation deviates from the maximum deformation.

As a result, as shown in FIG. 7 (c), the relationship between the value of the damping force and the inter-story displacement of the building BL can be changed. Then, the damping force of the entire vibration damping device 1 can be increased or decreased according to the vibration of the building BL, and the vibration can be damped between the two members. At that time, the screw shaft 15 may continuously or intermittently change the expansion / contraction position within one cycle of the waveform b according to the direction of vibration, or may be switched to a predetermined expansion / contraction position and stopped.
In the vibration damping device 1, when the drive motor M of the shaft length variable member 10 is not driven in the event of an earthquake or the like, the screw shaft 15 does not change in the axial direction, so that the shaft length variable member 10 exhibits certain characteristics. The fixed damping characteristic of the vibration damping damper 11 represents the damping characteristic of the vibration damping device 1.

By introducing this vibration damping system 5 into the building BL, the vibration of the building BL can be easily and actively controlled, and efficient vibration control can be performed with the vibration damping damper 11 which is less than the passive type vibration damping. Can be done. Further, the vibration damping system 5 can be easily introduced not only into the newly constructed building BL but also into the existing building BL, and the existing vibration damping damper 11 can be used for active vibration damping.
In the vibration damping device 1 according to the present embodiment, an example in which the vibration damping device 1A is connected between the Y-shaped brace Br1 and the pillar P2 as shown in FIG. 2A has been described in the above description. As shown in 2 (b), the same can be applied to the vibration damping device 1B connected between the upper brace member Br2a and the lower brace member Br2b.

As described above, according to the vibration damping device 1 and the vibration damping system 5 in the present embodiment, the relative displaceable two members of the building BL (for example, between the Y-shaped brace Br1 and the pillar P2, or the upper brace member Br2a). A ball screw 12 having a variable axial length by advancing and retreating the screw shaft 15 and a shaft length variable member 10 provided with a drive motor M, which are interposed between the lower brace member Br2b and the lower brace member Br2b, are connected in series with the vibration damping damper 11. By combining them, damping force and restoring force can be arbitrarily applied to the building BL, and the vibration of the building BL can be efficiently damped.
As a result, it is possible to realize the active type vibration damping device 1 having a simple structure and easy adjustment, so that vibration control can be performed more efficiently than the passive type vibration damping device.

The present invention is not limited to the vibration damping device 1 and the vibration damping system 5 according to the above-described embodiment, and appropriate changes and replacements can be made without changing the gist of the present invention. Is also included in the present invention. Hereinafter, modifications of the present invention and the like will be described, but the same reference numerals will be used for the same or similar parts and members as those in the above-described embodiment, and the description thereof will be omitted.

For example, in the vibration damping device 1A according to the above-described embodiment, one end of the screw shaft 15 of the ball screw 12 is connected to the vibration damping damper 11 so that the ball screw 12 can move forward and backward, and the support guide portion 13 is connected to the top Br1a. Alternatively, one end of the screw shaft 15 of the ball screw 12 may be connected to the top portion Br1a, and the support guide portion 13 on the opposite side may be connected to the vibration damping damper 11. In this case, the ball nut 14 and the support guide portion 13 advance and retreat relative to the screw shaft 15 to expand and contract the vibration damping damper 11.
Further, in the vibration damping system 5, the number and type of vibration sensors 6 can be arbitrarily selected. Further, the control by the control unit 7 may be optimized by feedback or learning as appropriate.

In addition, the shaking of the building BL includes not only seismic motion but also vibration caused by wind.
The vibration damping device 1 can be installed at an arbitrary location in the building BL, and the number of installations can be appropriately selected. Further, the types of braces connecting the vibration damping devices 1 do not have to be unified, and various types of braces may be mixed.

1,1A, 1B Vibration control device 5 Vibration control system 6 Vibration sensor 7 Control unit 10 Shaft length variable member 11 Vibration control damper 12 Ball screw 13 Support guide part 14 Ball nut 15 Screw shaft BL Building P, P1, P2 Pillar Br1 Y-shaped brace Br2 One-sided brace

Claims (4)

In the vibration damping device installed between the first member and the second member that can be displaced relative to each other in the building.
Screw shaft and
A rotating body that adjusts the amount of advance / retreat of the screw shaft with respect to a reference position by screwing into the screw shaft and relatively advancing / retreating the screw shaft by rotation.
A support guide portion that rotatably holds the rotating body and
A drive source for rotationally driving the rotating body and
A vibration damping damper connected in series with the screw shaft or the support guide portion,
Equipped with a,
The reference position is determined so as to the end of the support guide portion on the protruding side of the screw shaft on which the screw shaft protrudes or the end of the rotating body on the protruding side of the screw shaft.
A vibration damping device characterized in that the distance between the first member and the second member can be adjusted by adjusting the amount of advance / retreat of the screw shaft. The vibration damping device according to claim 1, wherein one of the screw shaft and the support guide portion is connected to the vibration damping damper, and the other is connected to either the first member or the second member. The drive source is fixed to the support guide portion, the screw shaft is connected to the vibration damping damper, and the support guide portion is connected to either the first member or the second member of the screw shaft . The vibration damping device according to claim 1 or 2, wherein the length can be adjusted between the vibration damping damper and the support guide portion by adjusting the amount of advance / retreat. The vibration damping device according to any one of claims 1 to 3 and
A vibration sensor that detects the vibration of the building and
A control unit that adjusts the amount of advance / retreat by the rotation of the drive source according to the magnitude of vibration detected by the vibration sensor.
A vibration damping system characterized by being equipped with.

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