JP3329698B2 - Dynamic vibration absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dynamic vibration absorber,
In particular, the present invention relates to a dynamic vibration absorber used for a high-rise building, a high-rise tower, a large passenger ship, or the like.

[0002]

2. Description of the Related Art Conventionally, dynamic vibration absorbers have been used to improve the comfort of rolling against high-rise buildings, high-rise towers, and the like, and rolling and pitching of luxury passenger ships.
This dynamic vibration absorber suppresses the vibration that occurs in high-rise buildings, high-rise towers, luxury passenger ships, etc. by vibrating the additional mass, and uses a TMD (Tuned Mass D
amper) and TLD (Tuned Liqui
d Damper).

The TMD supports an additional mass 20 with a laminated rubber 21 as shown in FIG. 5A, for example, and is installed at the top 22a of a building 22. Such a T
When a horizontal force is applied to the building 22, the MD has an additional mass 2
0 is displaced in the direction opposite to the displacement direction of the building 22. Therefore, the force generated in the building 22 while the additional mass 20 vibrates can be canceled.

[0004] Further, as shown in FIG.
Water 30 as an additional mass is stored in a container 31.
It is installed on the building 32. In this case, the water 30 and the container 31 also serve as a damper. In such a TLD, when a horizontal force is applied to the building 32, the water 30 in the container 31 resonates and absorbs vibration energy from the building 32 as vibration of the water 30. That is, since vibration energy can be consumed by friction or collision of the water 30, the force generated in the building 32 can be canceled.

[0005]

SUMMARY OF THE INVENTION However, TMD
In order to increase the amount of deformation due to the use of the laminated rubber for shearing, the number of steps and the cross-sectional area had to be increased. Further, in order to adjust the cycle after installing the TMD in the building, it is necessary to increase or decrease the number of steps or to exchange or increase or decrease the spring element, so that there is a problem that the number of man-hours increases. Further, in the TMD, after the building starts to shake, the added mass as a weight reacts, and the control effect appears only when the vibration is in a steady state, so that it takes time for the vibration control operation. For this reason, the effect is initially small with respect to an unsteady disturbance such as an earthquake, and therefore, it is generally used only for wind sway suppression of a structure that easily shakes.

On the other hand, the TLD operates with high sensitivity even to minute vibrations, and the period can be adjusted by the size and depth of the container. Thereby, the natural frequency of the vibration can be tuned and attenuated appropriately. Further, the attenuation can be controlled by changing the water depth, installing nets, rods, and partition plates, using a highly viscous liquid, and mixing suspended matters.

However, when compared with TMD, the specific gravity of water is as small as about one-eighth that of steel, so that there is a problem that the volume is large. Since the liquid used as the weight is smaller than the specific gravity of the steel material other than water, the volume is large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to make the vibration cycle longer, and also to make it easier to adjust the cycle after installation on the structure. The purpose is to provide a vessel.

[0009]

According to the present invention, there is provided a dynamic vibration absorber which suppresses vibration of a structure by using an additional mass. , A second laminated rubber bearing fixed to a lower surface of an additional mass separated by a predetermined distance from a fixing position of the first laminated rubber bearing, and a lower surface of the second laminated rubber bearing And a pair of links having one surrounding pair, one of which is a first laminated rubber bearing and the other a link. includes but a link connection mechanism which is fixed to the second laminated rubber bearing body, link coupling mechanism, the coupling
Length adjusting means for adjusting the lengths of two linked links
Having.

In the thus constructed dynamic vibration absorber of the present invention, when a force is applied in the horizontal direction, the rolling bearing fixed to the additional mass via the second laminated rubber bearing moves on the structure. . At this time, the first laminated rubber bearing and the second laminated rubber bearing which are connected to the rolling bearing by the link coupling mechanism are twisted, so that the first laminated rubber bearing and the second laminated rubber bearing are twisted. It can return to the original position by the spring action by the torsion of the support. Since the second laminated rubber bearing is connected to the moving rolling bearing by the link connecting mechanism, the amount of horizontal deformation of the support is increased, and the horizontal rigidity is reduced by the action of the length of the link. be able to. Thereby, the oscillation cycle can be lengthened. In addition, the vertical load of the added mass is because the rolling bearing is fixed to the lower surface of the second laminated rubber bearing,
It can be stably supported by the rolling bearing together with the second laminated rubber bearing. Further, since the torsional rigidity of the first laminated rubber bearing and the second laminated rubber bearing can be changed, the period can be adjusted without changing the weight of the additional mass.

Further, it is preferable that the structure has a concave curved surface portion with which the rolling bearing body is rollably contacted. Thereby, the rolling bearing body moved in the horizontal direction can return to the original position along the concave curved surface, that is, the deepest position of the concave curved surface portion. Therefore, the added mass can completely return to the original position.

In the dynamic vibration absorber of the present invention, the rolling bearing has a rolling member which rolls with respect to the structure, and the rolling member is preferably immersed in a viscous fluid. Thereby, the vibration of the additional mass can be attenuated.

Further, in the dynamic vibration absorber of the present invention, a viscous elastic body may be lined in a rolling range of the rolling support of the structure. Thereby, the vibration of the additional mass can be attenuated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a dynamic vibration absorber according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1A and 1B, the dynamic vibration absorber of the present invention suppresses the vibration of the structure 3 using the additional mass 2 and is fixed to the upper surface 3a of the structure 3. The first laminated rubber bearing 4 and the fixing position F of the first laminated rubber bearing 4
And a second laminated rubber bearing 5 fixed to the lower surface 2a of the additional mass 2 which is separated from the structural member 3 by a predetermined distance and fixed to the lower surface 5a of the second laminated rubber bearing 5. And a link connecting mechanism 7 for connecting the first laminated rubber bearing 4 and the second laminated rubber bearing 5 to each other.

The first laminated rubber bearing 4 and the second laminated rubber bearing 5 are formed by laminating a large number of rubber layers and metal plates in layers, and this rubber layer has natural rubber or chloroprene having an excellent elastic function. Rubber is used. As the metal plate, a nickel plate, a copper plate, a brass plate, a nickel-plated, copper-plated, brass-plated steel plate or the like is used because of its adhesion to the rubber layer. At the time of attachment, a cold adhesive may be used.

A rolling member, for example, a ball bearing 8 is held on the rolling bearing 6 so as to roll on the structure 3. The supporting point of the ball bearing 8 of the rolling bearing 6 is fixed to the second laminated rubber bearing 5 via the bearing 11 so as to overlap the laminated rubber of the second laminated rubber bearing 5. As a result, the vertical load of the additional mass 2 is reduced to the second
The rolling bearing 6 together with the laminated rubber bearing 5 can support the rubber in a stable state. Since such a rolling bearing 6 does not have a specific period, it can freely move on the structure 3.

The link connecting mechanism 7 is composed of two links 71 and 72 having one turning pair.
3, the support point 71a of the link 71 is fixed to the upper surface 4a of the first laminated rubber support 4 fixed to the upper surface 3a of the structure 3, and the support point 72a of the link 72 is fixed. Are fixed between the second laminated rubber bearing member 5 and the bearing 11. The link connecting mechanism 7 has a link adjusting means 74 for adjusting the length of the connected link 71 and / or link 72. Since the horizontal rigidity of the dynamic vibration absorber of the present invention depends on the torsional spring constant of the first and second laminated rubber supports 4 and 5, the link adjusting means 74 is provided with the link 71 of the link connecting mechanism 7. By changing the length of the link 72 and / or the torsional rigidity can be changed. That is, link 7
The torsional stiffness can be reduced by increasing the total length of the links 1 and 72, and the torsional stiffness can be increased by reducing the total length of the links 71 and 72. This means that if the allowable torsion angle of the laminated rubber bearing is the same, the longer the link is, the greater the amount of horizontal deformation can be.

The link adjusting means 74 includes long holes 71b, 72b formed in the links 71, 72, a shaft holder 75A for rotatably fixing the shaft 73 in the long holes 71b, 72b, 75B. The shaft holders 75A and 75B
Slots 71c, 71d, 72c, 72d for fixing bolts drilled in parallel with the slots 71b, 72b of the first and second slots 72b.
Is fixed with fixing bolts 76. Here, for example, when adjusting the length of the link 72, the shaft holder 7
5B is fixed to the link 72 by loosening the fixing bolt 76, and the shaft holder 75B is
It is moved to a predetermined position along b, and the fixing bolt 76 is fixed. Thereby, the total length of the links 71 and 72 can be changed.

As shown in FIGS. 2A and 2B, the link adjusting means of the link connecting mechanism 7 includes a link 71 fixed to the upper surface 4a of the first laminated rubber support 4 and a first It may be movable with respect to the laminated rubber support 4. That is,
An elongated hole 71 e for a fixing bolt for inserting a fixing bolt 77 for fixing the first laminated rubber support 4 to the link 71,
71 f is formed along the longitudinal direction of the link 71. According to such a link adjusting means, the fixing bolt 77 for fixing the link 71 to the first laminated rubber support 4 is loosened, and this link 71 is fixed to the fixing bolt elongated holes 71e, 71f.
, The entire length of the links 71 and 72 can be changed by fixing the fixing bolt 77.

A track 9 for rolling the ball bearing 8 of the rolling bearing 6 may be provided on the upper surface 3a of the structure 3.

The seismic isolation operation of the thus configured dynamic vibration absorber will be described below.

As shown in FIGS. 3 and 4, for example, the dynamic vibration absorber is provided with a first laminated rubber bearing 4, a second laminated rubber bearing 5 and a link connection for an additional mass 2 composed of one circle. Combination of mechanism 7 (hereinafter, referred to as "vibration absorber") 1
A, 1B, and 1C are installed on the structure 3 at equal intervals with a central angle of 120 degrees. Specifically, the vibration absorber 1A,
Each of the second laminated rubber bearings 1B and 1C is fixed to the lower surface 2a of the additional mass 2 at equal intervals of a central angle of 120 degrees, and the first laminated rubber bearings 4 for fixing the rolling bearings 6 respectively. Are fixed on the structure 3 located on the straight lines L1, L2, L3 connecting the center point O1 of the additional mass 2 and the center point of each of the first laminated rubber bearing members 4. In addition, each first
The link connecting mechanisms 7 for connecting the laminated rubber bearing members 4 and the second laminated rubber bearing members 5 are provided so as to be bent at a predetermined angle in the same direction. In addition, the vibration absorber 1
Each of the rolling bearings 6 of A, 1B, and 1C is placed on a track body 9 fixed to the upper surface 3a of the structure 3.

In the dynamic vibration absorber arranged as described above,
When a force is applied in the horizontal direction, each vibration absorber 1
Since each of the link connecting mechanisms 7 bends by moving the rolling bearings 6 of A, 1B, and 1C, each of the first stacks connected to each of the rolling bearings 6 by each link connecting mechanism 7 by this bending movement. The rubber bearing 4 and each second laminated rubber bearing 5 are subjected to a torsional displacement. At this time, no restoring force is generated in each of the rolling bearings 6, but the rolling bearings 6 can be returned to their original positions by a spring action due to the torsion of each of the first laminated rubber bearings 4 and each of the second laminated rubber bearings 5. . Since each of the second laminated rubber bearing members 5 is connected to each of the moving rolling bearing members 6 by each of the link connecting mechanisms 7, the amount of horizontal deformation is increased and the horizontal rigidity can be reduced. Thereby, the oscillation cycle can be lengthened. Further, since the first laminated rubber support 4 is in a no-load state, an uneasy factor is eliminated, and a spring action by torsion can be exhibited in a stable state.

Since the horizontal rigidity of the dynamic vibration absorber depends on the torsional spring constant of the first and second laminated rubber supports 4 and 5, the shaft adjustment is performed by the link adjusting means 74 of the link connecting mechanism 7. Move the joining position of 73 to link 7
By changing the position lengths of 1, 72, the torsional rigidity can be changed. Thereby, the period can be adjusted without changing the additional mass 2.

The intervals at which the vibration absorbers 1A, 1B, and 1C are arranged with respect to the circular additional mass 2 are not limited to the central angle of 120 degrees. Further, the shape of the additional mass is not limited to a circle, and may be any shape as long as the force generated in the structure 3 can be canceled.

Further, when the vibration of the additional mass 2 is attenuated, a laminated rubber with a lead plug in which a lead plug is pressed into the center of the laminated rubber, or a laminated rubber with high attenuation is used. Further, the ball bearing 8 of the rolling bearing 6 may be immersed in a viscous fluid such as silicone oil, and the rolling range 6 of the rolling bearing 6 of the structure 2 may be made of a polymer material, viscoelastic rubber, or the like. A viscoelastic body may be lined (FIG. 1). As a result, the rolling motion is attenuated.
If these are used together, the damping ability can be enhanced.

Further, by providing a concave curved surface portion whose center portion is the deepest in the rolling range portion 10 of the structure 2 by the rolling bearing member 6, the rolling bearing member 6 which has moved in the horizontal direction can move along the concave curved surface portion. It can be returned to the original position, that is, the deepest position of the concave curved surface portion (FIG. 1).

[0029]

As is apparent from the above description, according to the dynamic vibration absorber of the present invention, the spring due to the bending motion of the link connecting mechanism and the torsion of the first and second laminated rubber bearing members. Since the horizontal motion can be isolated by the action, the vibration cycle can be lengthened. As a result, it is generally possible to increase the safety of a high-rise building having a long cycle.

Further, since the torsional rigidity can be changed by changing the link length by the link length adjusting means of the link connecting mechanism, the period can be adjusted without changing the added mass. This makes it easy to adjust the cycle after installation on the structure, and can reduce the construction cost due to an increase or decrease in the added mass.

Further, since the horizontal rigidity of the support system is determined not by the horizontal rigidity of the laminated rubber but by the torsional rigidity,
Large deformation can be obtained because the amount of deformation is not governed by the cross-sectional area and thickness of the laminated rubber, and buckling stability can be obtained because the horizontal rigidity is reduced and stable load bearing capacity can be exhibited even during deformation. In addition, the size and weight of the laminated rubber can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a dynamic vibration absorber according to the present invention, wherein (a) is a side view and (b) is a partial top view of (a).

FIG. 2 is an explanatory view showing another embodiment of the link length adjusting means used in the dynamic vibration absorber of the present invention, wherein (a) is a side view,
(B) is a bottom view.

FIG. 3 is an explanatory view showing an arrangement state of the dynamic vibration absorber of the present invention.

FIG. 4 is an explanatory view showing a side surface of the dynamic vibration absorber of FIG. 3;

5A and 5B are diagrams illustrating a conventional dynamic vibration absorber, in which FIG. 5A is a diagram illustrating the operation of a TMD, and FIG. 5B is a diagram illustrating the operation of a TLD.

[Explanation of symbols]

 2... Additional mass 3... Structure 4... First laminated rubber bearing 5. Body 7 Link connecting mechanism 8 Ball bearing (rolling member) 10 Rolling range 71, 72 Two links 74 .Link length adjustment means

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 341 E04B 1/36 F16F 15/02

Claims (4)

(57) [Claims] 1. A dynamic vibration absorber for suppressing vibration of a structure (3) by using an additional mass (2), wherein a first laminated rubber bearing (4) fixed to an upper surface of the structure, A second laminated rubber bearing (5) fixed to the lower surface of the additional mass and separated from the fixing position of the first laminated rubber bearing by a predetermined distance; and a second laminated rubber bearing fixed to the lower surface of the second laminated rubber bearing. A rolling bearing (6) rotatably abutting against the structure and two links (7
A link connecting mechanism (7) in which one of the links is fixed to the first laminated rubber bearing and the other is fixed to the second laminated rubber bearing, respectively.
And the link connection mechanism is connected to the two
Link length adjusting means (74) for adjusting the link length is provided.
A dynamic vibration absorber characterized in that: 2. A structure according to claim 1, wherein said structure is provided with a concave curved surface portion against which said rolling bearing body is rollably contacted.
The dynamic vibration absorber according to claim 1 . Wherein the rolling bearing member has a rolling member (8) which roll against the structure, according to claim 1, wherein the rolling member is characterized by being immersed in the viscous fluid Dynamic vibration absorber. 4. A dynamic vibration absorber according to claim 1 , wherein a viscoelastic body is lined in a rolling range portion of said structure by said rolling bearing.