JP2008249122A - Vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device simply constructed to be superior in mass-productivity and maintainability with a less number of components while holding the normal installation height lower, superior in space saving and handling property while reliably guiding a rotor with guide parts, superior in rolling stability of the rotor and free design of the guide parts and the rotor while coping with the natural period of a structure only by changing the shape of the rotor and/or an arrangement space between the guide parts, and superior in vibration damping reliability. <P>SOLUTION: The vibration damping device comprises a base 2, the two guide parts 3, 3 arranged opposing each other on the upper face side of the base 2, and the rotor 5 for rolling on the two guide parts 3, 3. A space between the two guide parts 3, 3 is gradually wider as tending from longitudinal central portions of the two guide parts 3, 3 symmetrically toward both ends. The outer diameter of the rotor 5 is gradually larger as tending from a longitudinal central portion of the axial core of the rotor symmetrically toward both ends. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a vibration damping device that is installed on the upper part of a structure and is used to attenuate the vibration early by suppressing the amplitude of vibration caused by wind load (aerodynamic force) generated in the structure and the amplitude of vibration caused by an earthquake. In particular, the present invention relates to a vibration damping device suitable for suppressing vibrations generated in high-rise buildings such as high-rise buildings, high-rise houses, and towers.

Various vibration control devices have been developed to protect structures such as buildings and bridges from shaking such as earthquakes and wind power. Among them, a single pendulum type vibration damping device that reduces vibration of a structure by changing the vibration energy given to the structure into kinetic energy of a weight and efficiently dampening it is well known. 1) “A guide member having a downwardly convex arcuate guide surface is attached to the structure so as to be swingable in a seesaw manner at the center, and the end of the guide member and the structure In between, a passive vibration damping mechanism that can be expanded and contracted substantially vertically is formed by connecting a spring and a damper in parallel, and a weight having a natural period equal to or close to the natural period of the structure is provided on the guide member. , A vibration damping device characterized in that it is installed movably along an arcuate guide surface.
JP-A-9-264379

However, the above conventional techniques have the following problems.
(1) The guide surface of the guide member has to be formed in an arc shape, lacking in productivity, and the height of the guide member itself is increased in order to form the arc-shaped guide surface, so that the vibration control device is large. And has a problem of lacking space saving.
In addition, the configuration is complicated, the number of parts is large, and there is a problem of lack of mass productivity, handleability, and maintainability.

  The present invention solves the above-mentioned conventional problems, has a simple configuration, has a small number of parts, is excellent in mass productivity and maintainability, can be kept low in normal installation height, and is excellent in space saving and handling. The rotating part can be reliably guided by the guide part, excellent in the stability of the rolling operation of the rotating body, excellent in designability of the guide part and the rotating body, the shape of the rotating body and / or the arrangement of the guide part An object of the present invention is to provide a vibration damping device that can cope with a difference in the natural frequency of a structure simply by changing the interval and is excellent in the reliability of the vibration damping action.

In order to solve the above problems, the vibration damping device of the present invention has the following configuration.
The vibration damping device according to claim 1 of the present invention is a vibration damping device that is installed on an upper portion of a structure and suppresses vibrations generated in the structure, and is opposed to the base and the upper surface side of the base. Two arranged guide portions, and a rotating body that rolls on the two guide portions, and the interval between the two guide portions is symmetrical from the longitudinal central portion of the two guide portions. It is formed so as to increase toward both ends, and the outer diameter of the rotating body is formed so as to increase symmetrically from the central portion in the longitudinal direction of the axis of the rotating body toward both ends. Have.
This configuration has the following effects.
(1) The distance between the two guide portions is formed so as to increase symmetrically from the longitudinal central portion of the two guide portions toward both ends, and the outer diameter of the rotating body is the length of the axis of the rotating body. By being formed so as to increase symmetrically from the center in the direction toward both ends, the position of the axis (rotation center) of the rotating body when the rotating body is positioned at the center in the longitudinal direction of the guide section When the center of gravity is low and the rotating body is positioned at both ends in the longitudinal direction of the guide part, the position (center of gravity) of the axis of the rotating body (center of rotation) is high, so the rotating body rolls over the guide part. By moving, the trajectory drawn by the center of gravity of the rotating body becomes an arc, the rolling of the rotating body is converted into pendulum motion, gravity acts on the structure due to the inertial reaction force of the pendulum motion of the rotating body and the center of gravity movement, The vibration generated in the structure can be reliably damped.
(2) Since there are two guide portions disposed opposite to the upper surface side of the base and a rotating body that rolls on the two guide portions, the rotating body can be horizontally supported by the two guide portions, When the rotating body rolls, the rotating body is difficult to skew, has excellent operational stability, and excellent vibration damping efficiency.
(3) Installation is completed simply by placing a base with two guide parts facing each other on the top of the structure, and placing a rotating body on the guide part. Excellent.

Here, the guide part is preferably formed such that the interval between the two protruding ridges projecting from the upper surface of the base increases symmetrically from the central part in the longitudinal direction toward both end parts. In addition, as long as the rotating body can be supported by the upper surface of the guide portion, a reinforcing material or the like may be disposed between the two ridges, or may be integrated by filling between the two ridges. Good.
By changing the shape of the rotating body and / or the arrangement interval of the guide portions, the position of the center of gravity of the rotating body changes, so that the radius of the pendulum motion can be changed and the frequency of the movement can be changed. Can handle differences in numbers. In addition, when the guide space | interval adjustment part which adjusts the arrangement | positioning space | interval of a guide part is provided with respect to the base, it can respond | correspond to several natural frequency with one damping device, and it is excellent in versatility.

If the distance between the two guide portions at a certain position is determined, the rotational radius (outer diameter) of the rotating body at that position is determined, so the distance between the two guide portions can be determined sequentially in the longitudinal direction of the guide portion. In this case, the entire shape of the rotating body is automatically determined. The shape of the rotating body is a substantially drum-like shape in which the upper surfaces of the truncated cones are connected face to face.
The rate of change in the interval between the two guide portions can be selected as appropriate. If the rate of change in the interval between the two guide portions is small, the rate of change in the outer diameter of the rotating body increases and rotation If the overall length of the body is shortened and the rate of change in the distance between the two guide portions is large, the rate of change in the outer diameter of the rotating body is reduced and the overall length of the rotating body is increased. Therefore, the shape of the guide part and the rotating body can be selected in consideration of the installation space, the workability of the guide part and the rotating body, and the like. It should be noted that the distance between the two guide portions at a certain position and the rotation radius of the rotating body at that position (the outer diameter is determined on a one-to-one basis, so the shape of the rotating body is determined first and the two guide portions are adjusted accordingly. The shape may be determined.

The base and the guide part can be assembled by screwing or welding by combining steel frames or steel plates. When building a structure, design the structure in consideration of the number, arrangement, weight, etc. of the vibration control devices, and ensure the rigidity to withstand the installation of the vibration control devices. Moreover, when installing in the existing structure, it is necessary to select a highly rigid place according to the structure of a structure.
In addition, in order to respond to the short side direction, long side direction, and torsional direction of the structure, a plurality of vibration control devices are arranged in parallel or in a right angle direction or the like.

The vibration damping device according to claim 2 of the present invention is a vibration damping device that is installed on an upper part of a structure and suppresses vibrations generated in the structure, and is opposed to the base and the upper surface side of the base. Two arranged guide portions, and a rotating body that rolls on the two guide portions, and the interval between the two guide portions is symmetrical from the longitudinal central portion of the two guide portions. The outer diameter of the rotating body is formed so as to decrease toward both ends, and the outer diameter of the rotating body is configured to decrease symmetrically toward the both ends from the central portion in the longitudinal direction of the axis of the rotating body. Have.
With this configuration, in addition to the same operations as (2) and (3) of the first aspect, the following operations are provided.
(1) The distance between the two guide portions is formed so as to decrease symmetrically from the longitudinal center portion of the two guide portions toward both ends, and the outer diameter of the rotating body is the length of the axis of the rotating body. When the rotating body is positioned at the center in the longitudinal direction of the guide portion, the position of the axial center (rotating center) of the rotating body is formed so as to decrease symmetrically from the center in the direction toward both ends. When the center of gravity is low and the rotating body is positioned at both ends in the longitudinal direction of the guide part, the position (center of gravity) of the axis of the rotating body (center of rotation) is high, so the rotating body rolls over the guide part. By moving, the trajectory drawn by the center of gravity of the rotating body becomes an arc, the rolling of the rotating body is converted into pendulum motion, gravity acts on the structure due to the inertial reaction force of the pendulum motion of the rotating body and the center of gravity movement, The vibration generated in the structure can be reliably damped.

Here, the guide part is preferably formed such that the interval between the two protruding ridges projecting from the upper surface of the base decreases symmetrically from the central part in the longitudinal direction toward both ends. In addition, instead of projecting the two ridges, a single ridge formed so that the width decreases from the central portion in the longitudinal direction toward both ends (the above-mentioned two ridges are widened to form a stepped shape. It is good also as a guide part.
The shape of the rotating body is an approximately abacus ball shape in which the bottom surfaces of the truncated cones are connected face to face.
The shape of the guide part and the rotating body in claim 2 is only that the shape of the guide part and the rotating body in claim 1 and the direction of the unevenness are reversed. The description is omitted because it is the same. Further, the manufacturing method of the base and the guide unit and the installation method of the vibration damping device are also the same as those of the first aspect, and thus the description thereof is omitted.
Similarly to the first aspect, by changing the shape of the rotating body and / or the arrangement interval of the guide portions, the position of the center of gravity of the rotating body changes, so that the radius of the pendulum motion can be changed and the frequency of the pendulum can be changed. It is possible to cope with the difference in the natural frequency of the structure. In addition, when the guide space | interval adjustment part which adjusts the arrangement | positioning space | interval of a guide part is provided with respect to the base, it can respond | correspond to several natural frequency with one damping device, and it is excellent in versatility.

Invention of Claim 3 is a vibration damping device of Claim 1 or 2, Comprising: The said rotary body is the disk shape formed in the longitudinal direction center part of the axial center around the said axial center. A concave shape in which the base is linearly disposed between the two guide portions in a direction orthogonal to the axis of the rotating body and the collar portion of the rotating body is loosely fitted and guided. And a groove-shaped scissors guide portion.
With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
(1) The rotating body includes a disc-shaped flange portion formed around the shaft core in the longitudinal center portion of the shaft core, and the base includes the shaft core of the rotating body between the two guide portions. Since it is provided with a concave or groove-shaped hook guide portion that is linearly arranged in the orthogonal direction and guided by loosely fitting the flange portion of the rotating body, it is possible to reliably advance the rotating body straight along the hook guide portion. In addition, the rotating body does not skew or fall off the guide portion, and is excellent in the stability of the rolling operation of the rotating body and in the reliability of the damping effect.

Here, the radius of the collar portion is formed larger than the maximum rotation radius of the rotating body. Thereby, the heel part can be reliably guided by the heel guide part regardless of the position of the rotating body on the guide part.
Since the rotating body rolls on the guide part, the rotating body moves pendulum and the center of gravity (rotation center) of the rotating body moves up and down, so that the lower end position of the collar also draws an arc-shaped locus. become. Therefore, when the rotating body is located at the center in the longitudinal direction of the guide portion, the lowermost point of the rotating body is the lower point of the rotating body. It is necessary to form a part. The bottom surface of the heel guide portion may be formed in a straight line with a depth equal to or greater than the position of the lower end surface of the heel portion at the lowest point of the rotating body, or according to the locus drawn by the lower end surface of the heel portion. You may form in circular arc shape.

A fourth aspect of the present invention is the vibration damping device according to any one of the first to third aspects, wherein the base is swingable about an axis parallel to the axis of the rotating body. It has the structure provided with the 1 or more spring and / or damper which were arrange | positioned between the support leg part to support, the bottom part of the said base, and the installation surface of the said structure.
With this configuration, in addition to the operation of any one of claims 1 to 3, the following operation is provided.
(1) The rotating body rolls due to the shaking of the structure, and the spring and / or damper disposed between the bottom of the base and the installation surface of the structure expands and contracts in the vertical direction. However, it swings like a seesaw around the pivot axis of the support leg, and the rolling of the rotating body is amplified, effectively damping the structure's vibration, and the efficiency of the damping action Excellent.
Here, the support leg can be disposed at an arbitrary position in the longitudinal direction of the base, and the base can be swung by a combination with the arrangement and number of springs and / or dampers.

A fifth aspect of the present invention is the vibration damping device according to any one of the first to fourth aspects, wherein the base is disposed at both end portions of the two guide portions. It has the structure provided with the fall prevention part contact | abutted to the outer peripheral surface.
With this configuration, in addition to the operation of any one of claims 1 to 4, the following operation is provided.
(1) Since the base has the fall prevention portions disposed at both ends of the two guide portions and in contact with the outer peripheral surface of the rotating body, the rolled rotating body does not fall from the base, The rotating body can be surely reciprocated (pendulum motion), and the operation is highly reliable.

Here, as a fall prevention part, what provided a wall, a protrusion, etc. in the upper surface of the both ends of a base, and controls a motion of a rotary body is used suitably. In particular, by providing a buffer member formed of an elastic body such as a spring or rubber on the contact surface with the rotating body, the impact force of the rotating body can be reduced, and the damping action of the rotating body can be reduced. While suppressing, it is possible to effectively prevent the rotating body from falling.
Depending on the natural frequency of the structure, the mass ratio with the rotating body, etc., the length of the necessary guide part can be set in advance, so a fall prevention part is not always necessary, but by providing a fall prevention part, It can reliably prevent the rotating body from dropping and has excellent reliability.

A sixth aspect of the present invention is the vibration damping device according to any one of the first to fifth aspects, further comprising an initial motion generating portion that urges the rotating body when the vibration of the structure is generated. It has the composition which is.
With this configuration, in addition to the operation of any one of claims 1 to 5, the following operation is provided.
(1) By having the initial motion generating portion that urges the rotating body when the vibration of the structure is generated, the rotating body can be reliably rolled, and the reliability of the damping action is excellent.

Here, the rotating body is in a state in which it is difficult to move due to its own weight and friction with the guide portion, but by giving the initial motion by the initial motion generating portion, it is possible to smoothly start rolling (pendulum motion). .
As the initial motion generating unit, when a vibration such as an earthquake is sensed, the rotating body may be directly energized, or the rotating body may be indirectly energized by swinging the base. . For example, a piston cylinder that uses hydraulic pressure, water pressure, or air pressure that presses the rotating body from the side, and one end in the longitudinal direction of the base is lifted once by a piston cylinder that uses hydraulic pressure, water pressure, or air pressure. A thing which returns to a horizontal state, a thing which lifts beforehand one end side of the longitudinal direction of a base with a piston cylinder etc. which used oil pressure, water pressure, and air pressure, etc. are used suitably.

As described above, according to the vibration damping device of the present invention, the following advantageous effects can be obtained.
According to invention of Claim 1, it has the following effects.
(1) On the two guide parts formed so that the distance increases symmetrically from the central part in the longitudinal direction toward both ends, the outer diameter is symmetrically directed from the central part in the longitudinal direction of the shaft toward both ends. When the rotating body formed to increase is rolled, the rotating body performs a pendulum motion, so that the gravity acts on the structure due to the inertial reaction force of the pendulum motion of the rotating body and the movement of the center of gravity. Therefore, it is possible to provide a vibration damping device that can reliably attenuate the vibration generated in the above and is excellent in the reliability of the vibration damping action.

According to invention of Claim 2, it has the following effects.
(1) On the two guide portions formed so that the distance decreases symmetrically from the central portion in the longitudinal direction toward both ends, the outer diameter is symmetrically directed from the central portion in the longitudinal direction of the shaft core toward both ends. When the rotating body formed to decrease is rolled, the rotating body performs a pendulum motion, so that gravity acts on the structure due to the inertial reaction force of the pendulum motion of the rotating body and the movement of the center of gravity. Therefore, it is possible to provide a vibration damping device that can reliably attenuate the vibration generated in the above and is excellent in the reliability of the vibration damping action.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2, it has the following effects.
(1) The disc-shaped collar formed at the center in the longitudinal direction of the axis of the rotating body can be loosely fitted and guided by the collar guide formed linearly in the longitudinal direction of the base. Therefore, the rotating body that rolls on the guide part does not run obliquely or fall off the guide part, and the rotating body has excellent linearity and stability of rolling operation, and the reliability of vibration control is reliable. It is possible to provide a vibration damping device with excellent performance.

According to invention of Claim 4, in addition to the effect of any one of Claims 1 thru | or 3, it has the following effects.
(1) When vibration is generated, the spring and / or damper disposed between the bottom of the base and the installation surface of the structure expands and contracts in the vertical direction, and the base itself moves the pivot of the support leg. Since it swings like a seesaw at the center, it can amplify the pendulum motion of the rotating body and provide a damping device with excellent damping efficiency that can effectively attenuate the shaking of the structure can do.

According to invention of Claim 5, in addition to the effect of Claims 1 thru | or 4, it has the following effects.
(1) The fall prevention part disposed at both ends of the guide part can reliably prevent the rotating body from falling, and the reciprocating motion (pendulum motion) is surely performed on the rotating body, thereby shaking the structure. Therefore, it is possible to provide a vibration damping device that is capable of attenuating the vibration and has excellent operational certainty.

According to invention of Claim 6, in addition to the effect of Claims 1 thru | or 5, it has the following effects.
(1) A vibration damping device excellent in the reliability of the vibration damping action that can urge the rotating body by the initial motion generating portion when the vibration of the structure is generated and can surely cause the rotating body to perform the pendulum motion. Can be provided.

Hereinafter, a vibration damping device according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic perspective view of a vibration damping device according to Embodiment 1 of the present invention. FIG. 2A is a schematic side view of a main part of the vibration damping device according to Embodiment 1 of the present invention. b) is a schematic plan view of an essential part of the vibration damping device according to Embodiment 1 of the present invention.
1 and 2, reference numeral 1 denotes a vibration damping device according to the first embodiment that is installed on the installation surface 20 at the upper part of the structure and suppresses vibration generated in the structure, 2 is a base of the vibration damping device 1, Two guide portions of the vibration damping device 1 that are arranged oppositely on the upper surface side of the base 2, and the distance between the guide portions is symmetrically increased from the central portion in the longitudinal direction toward both ends, 4a is a vibration damping device formed between two protruding strip members 4 which are provided between two guide portions 3 on the base 2 and project linearly in a direction orthogonal to the axis of the rotating body 5 which will be described later. 1 groove-shaped scissors guide portion 5 is formed in a drum shape so that its outer diameter increases symmetrically from the central portion in the longitudinal direction of its axial center toward both ends, and rolls on two guide portions 3. The rotating body 5a of the vibration damping device 1 is a minimum diameter portion that is an axial center formed in the longitudinal central portion of the rotating body 5, and 5b is a rotating body from the minimum diameter portion 5a. The inclined outer peripheral surface 5c of the rotating body 5 formed so that the outer diameter increases toward both ends in the longitudinal direction of the shaft core 5c is the maximum diameter formed at both ends in the longitudinal direction of the shaft core of the rotating body 5. And 6 are discs of the rotating body 5 that are formed in the central portion in the longitudinal direction of the shaft core of the rotating body 5 so as to have a larger diameter than the maximum diameter portion 5c around the shaft core and are loosely fitted to the guide portion 4a and guided. It is a buttock.

Here, how to obtain the shape of the rotating body 5 will be described.
FIG. 3 is a diagram showing the relationship between the moving distance in the horizontal direction of the rotating body of the vibration damping device in Embodiment 1 of the present invention and the rotation radius of the rotating body.
In FIG. 3, o is the origin of the central portion in the longitudinal direction of the guide portion 3, x is the moving distance in the horizontal direction of the rotating body 5, z is the vertical moving amount of the center of gravity (rotating center) of the rotating body 5, and r ₀ is Rotating radius (= minimum radius) of the rotating body 5 at the origin o, r _x is the rotating radius of the rotating body 5 at the horizontal movement distance x from the origin o, and l is the length of the pendulum in the pendulum motion of the rotating body 5; θ is a swing angle of the pendulum in the pendulum motion of the rotator 5, and m is a locus drawn by the center of gravity (rotation center) of the rotator 5 when the rotator 5 moves on the guide portion 3 to perform the pendulum motion.

Assuming that the natural frequency of the structure in which the vibration damping device 1 is installed is f and the gravitational acceleration is g, the relationship with the pendulum length l required to attenuate the vibration energy is as follows:
f = (g / l) ^1/2 / (2π)
So,
l = g / (2πf) ²
It becomes.
Therefore, in order to attenuate the vibration energy of the structure by the movement of the rotating body 5, the center of gravity (rotation center) of the rotating body 5 may be moved on the trajectory drawn by the pendulum having the length l. .
Since the movement distance in the horizontal direction when the pendulum having the length l touches only the deflection angle θ corresponds to the movement distance x in the horizontal direction of the rotating body 5,
x = l · sin θ
And
θ = sin ⁻¹ (x / l)
It becomes.
Further, since the vertical movement distance when the pendulum having the length l touches only the swing angle θ corresponds to the vertical movement distance z of the center of gravity (rotation center) of the rotating body 5,
z = 1 (1-cos θ)
It becomes.
At this time, the moving distance z in the vertical direction of the center of gravity (rotation center) of the rotating body 5 becomes the increase amount of the rotating radius of the rotating body 5 as it is, and therefore the rotating radius r _x of the rotating body 5 at the moving distance x in the horizontal direction. Is
r _x = r ₀ + z
= R ₀ + l (1-cos θ)
= R ₀ + l [(1-cos {sin ⁻¹ (x / l)}] (Equation 1)
It becomes.
Therefore, the rotation radius r _x of the rotating body 5 at the horizontal movement distance x from the origin o can be obtained from (Equation 1).

If the distance between the two guide portions 3 in the horizontal movement distance x from the origin o is determined, the rotation radius (outer diameter) r _x of the rotating body 5 at that position is determined. If the distance between the two guide portions 3 is determined sequentially, the entire shape of the rotating body 5 is automatically determined.
The rate of change in the distance between the two guide parts 3 can be selected as appropriate. If the rate of change in the distance between the two guide parts 3 is small, the outer diameter of the outer peripheral surface 5b of the rotating body 5 can be reduced. If the rate of change increases, the overall length of the rotating body 5 decreases, and the rate of change in the distance between the two guide portions 3 increases, the rate of change in the outer diameter on the outer peripheral surface 5b of the rotating body 5 decreases. The entire length of the rotating body 5 is increased. Therefore, the shape of the guide part 3 and the rotating body 5 can be selected in consideration of the installation space and the workability of the guide part 3 and the rotating body 5. Since the distance between the two guide portions 3 at a certain position x and the rotation radius (outer diameter) r _x of the rotating body 5 at that position are determined one-to-one, the shape of the rotating body 5 is determined first, In addition, the shape (interval) of the two guide portions 3 may be determined.

In the present embodiment, the outer peripheral surface 5b of the rotator 5 is linear, but the shape of the rotator 5 is not limited to this, and depending on the rate of change in the distance between the two guide portions 3, The outer peripheral surface 5b has an upwardly convex or downwardly convex arc shape.
In addition, since the gravity center position of the rotating body 3 is changed by changing the shape of the rotating body 5 and / or the arrangement interval of the guide portions 3, the radius of the pendulum motion can be changed and the frequency thereof can be changed. It can cope with the difference in the natural frequency of the structure. In particular, when a guide interval adjustment unit that adjusts the arrangement interval of the guide portion 3 is provided for the base 2, the arrangement interval of the guide portion 3 can be finely adjusted according to the natural frequency of the structure. Excellent in reliability and damping effect.

The operation of the vibration damping device according to Embodiment 1 of the present invention configured as described above will be described.
In the normal state, the rotating body 5 is stationary on the guide portion 3. When the structure is shaken by an earthquake or the like, the rotating body 5 tries to stay in place according to the law of inertia, but the rotating body 5 is installed movably along the guide portion 3, so It starts to move on the guide part 3 with a certain phase delay with respect to the shaking. In addition, since the collar part 6 of the rotary body 5 is loosely fitted and guided by the collar guide part 4a, the rotary body 5 moves straight along the collar guide part 4a without dropping off from the guide part 3.
At this time, as described above, the distance between the guide portions 3 and the rotation on the outer peripheral surface 5b of the rotating body 5 are such that the center of gravity (rotation center) of the rotating body 5 moves on the trajectory m drawn by the pendulum having a length l. Since the radius r _x is designed (see FIG. 3), as a result, the inertial reaction force of the pendulum motion of the rotating body 5 and the gravity due to the movement of the center of gravity act on the structure, thereby damping the structure.
In addition, since the gravity center position of the rotating body 5 is changed by changing the arrangement interval between the two guide portions 3, the radius of the pendulum motion can be changed, and the frequency of the change can be changed. Can cope with the difference.

In the present embodiment, the guide portion 3 is formed by projecting two ridges on the upper surface of the base 2. The base 2, the guide portion 3, and the ridge member 4 can be assembled by combining steel frames, steel plates, and the like by screwing or welding, and each portion can be reinforced within a range that does not interfere with the rotating body 5. In particular, when the guide portion 3 is formed on a ridge, a cross-sectional shape is formed in an I-shaped rail shape or a reinforcing material is disposed between the guide portion 3 and the ridge member 4 in order to ensure strength. You may do it. Moreover, since the rotary body 5 should just be supported on the upper surface of the guide part 3, between the guide part 3 and the protruding item | line member 4 may be filled and integrated.
Further, in the present embodiment, the heel guide portion 4a is linearly formed at a depth at which the lower end surface of the heel portion 6 of the rotating body 5 and the bottom surface of the heel guide portion 4a do not interfere with each other, but the bottom surface of the heel guide portion 4a is In addition, it may be formed in an arc shape in accordance with the locus drawn by the lower end surface of the collar portion 6.
When constructing a structure, structural design is performed in consideration of the number, arrangement, weight, and the like of the vibration damping device 1 to ensure rigidity sufficient to withstand the installation of the vibration damping device 1. Moreover, when installing in the existing structure, it is necessary to select a highly rigid place according to the structure of a structure.
In addition, in order to respond to the short side direction, the long side direction, and the torsional direction of the structure, a plurality of vibration damping devices 1 are arranged in parallel or in a right angle direction or the like.

As described above, the vibration damping device according to Embodiment 1 has the following effects.
(1) The distance between the two guide portions 3 is formed so as to increase symmetrically from the longitudinal center portion of the two guide portions 3 toward both end portions, and the outer diameter of the rotating body 5 is When the rotating body 5 is positioned at the longitudinal center of the guide portion 3 by being symmetrically increased from the longitudinal center portion of the shaft core toward both ends, the shaft of the rotating body 5 When the position (center of gravity) of the core (rotation center) is low and the rotating body 5 is positioned at both ends in the longitudinal direction of the guide portion 3, the position (center of gravity) of the shaft core (rotation center) of the rotating body 5 is high. Therefore, when the rotating body 5 rolls on the guide portion 3, the locus drawn by the center of gravity of the rotating body 5 becomes an arc, and the rolling of the rotating body 5 is converted into a pendulum motion, and the inertia of the pendulum motion of the rotating body 5. Gravity acts on the structure due to the reaction force and the movement of the center of gravity, and the vibration generated in the structure is reliably damped. It can be.
(2) Since the two guide portions 3 disposed opposite to each other on the upper surface side of the base 2 and the rotating body 5 rolling on the two guide portions 3 are provided, the rotating body 5 is horizontally placed by the two guide portions 3. It can be supported, and when the rotating body 5 rolls, the rotating body 5 is difficult to skew, and has excellent operational stability and excellent vibration damping efficiency.
(3) Since the base 2 with the two guide portions 3 facing each other is installed on the upper part of the structure and the rotating body 5 is placed on the guide portion 3, the installation is completed, so the handling is easy. Excellent workability.
(4) The rotating body 5 includes a disk-shaped flange 6 formed around the shaft core at the center in the longitudinal direction of the shaft core, and the base 2 is a rotating body between the two guide portions 3. 5 is provided linearly in a direction orthogonal to the axis of the shaft 5 and is guided by loosely fitting the flange portion 6 of the rotating body 5. Therefore, the rotating body 5 can be reliably moved along the flange guide portion 4 a. The rotating body 5 is not inclined and does not fall off the guide part 3 and is excellent in the stability of the rolling operation of the rotating body 5 and in the reliability of the damping function. Excellent.

(Embodiment 2)
FIG. 4 is a schematic perspective view of the vibration damping device according to the second embodiment of the present invention, and FIG. 5A is a schematic side view of a main part of the vibration damping device according to the second embodiment of the present invention. b) is a schematic plan view of an essential part of a vibration damping device according to Embodiment 2 of the present invention.
4 and 5, the vibration damping device 1a according to the second embodiment is different from the first embodiment in that the base 2a has a single recess having a width that decreases symmetrically from the center in the longitudinal direction toward both ends. The point where the strip 3b is formed and both side portions thereof are the guide portions 3a, and the bottom surface of the flange guide portion 4b formed in the recess on the base 2a is a locus drawn by the lower end surface of the flange portion 16 of the rotating body 15. In addition, the point formed in an arc shape and the outer diameter of the outer peripheral surface 15b of the rotating body 15 are directed from the maximum diameter portion 15a at the central portion in the longitudinal direction of the axis of the rotating body 15 to the minimum diameter portions 15c at both ends. It is the point formed so that it may decrease.

The shape of the rotator 15 has a bottom surface having the same diameter as the maximum diameter portion 15a, and the bottom surfaces of the truncated cones having the minimum diameter portion 15c as an upper surface are arranged face to face and connected by a cylindrical maximum diameter portion 15a. It has an approximate abacus ball shape.
Here, the shape of the guide part 3a and the rotating body 15 in the second embodiment is merely the reverse of the shape of the guide part 3 and the rotating body 5 in the first embodiment and the direction of the unevenness. Since the method of obtaining is the same as in the first embodiment, the description thereof is omitted.
The manufacturing method, installation method, and operation of the vibration damping device 1a are also the same as those in the first embodiment, and thus the description thereof is omitted.

In the present embodiment, a single recess 3b whose width decreases symmetrically from the central portion in the longitudinal direction toward both ends is formed on the base 2a, and both side portions thereof serve as guide portions 3a. Thereby, the guide part 3a used as the edge of the both sides of the groove 3b can be contact | abutted to the outer peripheral surface 15b of the rotary body 15, and the rotary body 15 can be supported so that rolling is possible.
Instead of the concave stripes 3b, two guides are formed by projecting two convex stripes on the upper surface of the base 2 so that the interval decreases symmetrically from the central part in the longitudinal direction toward both ends. May be.
Moreover, in this Embodiment, the bottom face of the collar guide part 4b is matched with the locus | trajectory which the lower end surface of the collar part 16 draws so that the lower end surface of the collar part 16 of the rotary body 15 and the bottom face of the collar guide part 4b may not interfere. However, the bottom surface of the flange guide portion 4b may be formed in a straight line with a depth that does not interfere with the lower end surface of the flange portion 16 of the rotating body 15.

  As described above, the vibration damping device according to the second embodiment has the same operation as that of the first embodiment.

(Embodiment 3)
FIG. 6A is a schematic side view showing a normal state of the vibration damping device according to the third embodiment of the present invention, and FIG. 6B is a diagram illustrating vibration generation of the vibration damping device according to the third embodiment of the present invention. It is a side surface schematic diagram which shows the state of time.
In FIG. 6, the vibration damping device 1 b in the third embodiment is different from the second embodiment in that the fall prevention portion 7 that comes into contact with the outer peripheral surface of the rotating body 15 is erected at both longitudinal ends of the base 2 a, The base 2a is swingably supported around an axis parallel to the axis of the rotating body 15 at the point where the buffer member 7a made of synthetic rubber is adhered to the surface and the longitudinal center of the base 2a. A point having a support leg 8 provided with a rotating shaft 8a, a point where a spring 9 is disposed between the bottom of both ends in the longitudinal direction of the base 2a and the installation surface 20 of the structure; The initial movement generating portion 10 using a piston cylinder is provided that protrudes from the installation surface 20 and supports the one end portion of the base 2a in the normal direction so as to lift upward.

The initial motion generating unit 10 is supported so that one end in the longitudinal direction of the base 2a is lifted upward in a normally extended state, and contracts when the generation of vibration is detected by a vibration sensor or the like to fix the base 2a. Is released. Thereby, since the base 2a rocks | swings around the rotating shaft 8a, the rotary body 15 is indirectly urged | biased and a pendulum motion is started.
Further, by providing the buffer member 7 a on the contact surface of the fall prevention unit 7 with the rotating body 15, the impact force of the rotating body 15 is alleviated and effective while suppressing the reduction of the damping action of the rotating body 15. In addition, the rotating body 15 can be prevented from falling.
In addition, since the length of the guide part 3a (refer FIG. 4) required previously can be set with the natural frequency of a structure, mass ratio with the rotary body 15, etc., the fall prevention part 7 is not necessarily required. However, by providing the fall prevention part 7, the fall of the rotary body 15 can be prevented reliably, and it is excellent in reliability.

As described above, according to the vibration damping device in the third embodiment, in addition to the operation obtained in the second embodiment, the following operation is provided.
(1) Since the base 2a has the fall prevention part 7 which is arrange | positioned at the both ends of the two guide parts 3a, and contact | abuts the outer peripheral surface of the rotary body 15, the rotary body 15 which rolled is removed from the base 2a. Without falling, the rotating body 15 can be surely reciprocated (pendulum motion), and operation reliability is excellent.
(2) By having the initial motion generating unit 10 that urges the rotating body 15 when the vibration of the structure is generated, the rotating body 15 can be reliably rolled, and the reliability of the damping action is excellent.
(3) The rotating body 15 rolls due to the shaking of the structure, and the spring 9 disposed between the bottom of the base 2a and the installation surface 20 of the structure expands and contracts in the vertical direction, and the base 2a It swings like a seesaw around the pivot shaft 8a of the support leg 8, and the rotation of the rotating body 15 is amplified, and the vibration of the structure can be effectively attenuated. Excellent in efficiency of action.

(Embodiment 4)
FIG. 7A is a schematic side view showing a normal state of the vibration damping device according to the fourth exemplary embodiment of the present invention, and FIG. 7B is a vibration generation of the vibration damping device according to the fourth exemplary embodiment of the present invention. It is a side surface schematic diagram which shows the state of time.
In FIG. 7, the vibration damping device 1c in the fourth embodiment is different from that in the third embodiment in that a support leg portion 8 that swingably supports the base 2a is disposed at one end in the longitudinal direction of the base 2a. It is a point that has been.
In addition, the initial motion generation unit 10a is supported to lift up the other end in the longitudinal direction of the base 2a in a normally extended state, but contracts when the generation of vibration is detected by a vibration sensor or the like, The base 2a is supported in parallel at the same height as the support legs 8. Due to the shaking of the base 2a at this time, the rotating body 15 is indirectly urged to start the pendulum motion.

  As described above, the vibration damping device according to the fourth embodiment has the same operation as that obtained in (1) and (2) of the second and third embodiments.

  The present invention has a simple configuration, has a small number of parts, is excellent in mass productivity, can reliably guide the rotating body by the guide section, has excellent stability of the rolling operation of the rotating body, and is designed for the guide section and the rotating body. A vibration damping device that is highly flexible and can respond to differences in the natural frequency of the structure by simply changing the shape of the rotating body and / or the arrangement interval of the guides, and has excellent vibration damping performance. Therefore, it can be suitably used for suppressing vibrations generated in high-rise buildings such as high-rise buildings, high-rise houses, and towers.

1 is a schematic perspective view of a vibration damping device according to Embodiment 1 of the present invention. (A) Main part side surface schematic diagram of the damping device in Embodiment 1 of this invention (b) Main part plane schematic diagram of the damping device in Embodiment 1 of this invention The figure which shows the relationship between the moving distance of the horizontal direction of the rotary body of the damping device in Embodiment 1 of this invention, and the rotation radius of a rotary body. Schematic perspective view of the vibration damping device in Embodiment 2 of the present invention (A) The principal part side surface schematic diagram of the damping device in Embodiment 2 of this invention (b) The principal part schematic diagram of the damping device in Embodiment 2 of this invention (A) Schematic side view showing the normal state of the vibration damping device in Embodiment 3 of the present invention (b) Schematic side view showing the state of vibration generation in the vibration damping device in Embodiment 3 of the present invention (A) Schematic side view showing the normal state of the vibration damping device in Embodiment 4 of the present invention (b) Schematic side view showing the state of vibration generation in the vibration damping device in Embodiment 4 of the present invention

Explanation of symbols

1, 1a, 1b, 1c Vibration damping device 2, 2a Base 3, 3a Guide portion 4 Projection member 4a 鍔 Guide portion 5 Rotating body 5a, 15c Minimum diameter portion 5b, 15b Outer peripheral surface 5c, 15a Maximum diameter portion 6, 16 flange part 7 fall prevention part 7a buffer member 8 support leg part 8a rotating shaft 9 spring 10, 10a initial motion generating part 20 installation surface

Claims (6)

A vibration damping device installed on top of a structure to suppress vibrations generated in the structure,
A base, two guide portions disposed opposite to the upper surface of the base, and a rotating body that rolls on the two guide portions,
An interval between the two guide portions is formed so as to increase symmetrically from the central portion in the longitudinal direction of the two guide portions toward both end portions, and the outer diameter of the rotating body is set to the axial center of the rotating body. A vibration damping device, wherein the vibration damping device is formed so as to increase from a longitudinal central portion toward both end portions. A vibration damping device installed on top of a structure to suppress vibrations generated in the structure,
A base, two guide portions disposed opposite to the upper surface of the base, and a rotating body that rolls on the two guide portions,
An interval between the two guide portions is formed so as to decrease symmetrically from the longitudinal center portion of the two guide portions toward both end portions, and an outer diameter of the rotating body is set to an axis of the rotating body. A vibration damping device, wherein the vibration damping device is formed so as to decrease from the central portion in the longitudinal direction toward both ends. The rotating body includes a disc-shaped flange portion formed around the shaft core in a longitudinal center portion of the shaft core, and the base includes a shaft of the rotating body between the two guide portions. 3. A concave or groove-shaped ridge guide portion that is linearly arranged in a direction orthogonal to the core and is guided by loosely fitting the ridge portion of the rotating body is provided. Damping device. One or more support legs that swingably support the base around an axis parallel to the axis of the rotating body, and one or more disposed between the bottom of the base and the installation surface of the structure The damping device according to any one of claims 1 to 3, further comprising a spring and / or a damper. The said base is provided with the fall prevention part which is arrange | positioned at the both ends of the said two guide parts, and contact | abuts the outer peripheral surface of the said rotary body, The one of Claims 1 thru | or 4 characterized by the above-mentioned. The vibration damping device described. 6. The vibration damping device according to claim 1, further comprising an initial motion generating unit that biases the rotating body when vibration of the structure is generated.

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