JPS62127540A - Dynamic vibration reducer - Google Patents

Abstract

PURPOSE:To control vibration of an object structure, by a method wherein an additional mass is freely movable in two horizontal directions X and Y, and through regulation of a spring, the natural period of a dynamic vibration reducer is coincided with the primary period of the object structure. CONSTITUTION:When an intermediate cradle 2 is moved rightward from a lower cradle 1, since a left spring mounting member 51 is prevented from rightward movement by means of a stopper S1. Therefore, in a tensile spring Kx, after, with the progress of movement by a distance delta in a rightward direction of a right spring mounting member 51 by means of a stopper member 22 of the intermediate cradle 2, elongation by a distance delta is exerted on the tensile spring Kx in a direction X also, it is brought into a static state to bring the intermediate cradle 2 into a static state. Two dampers Cx in the direction X work on elongation of the tensile spring Kx, and relative movement of the upper cradle 3 with the lower cradle 1 is rapidly damped.

Description

[Detailed Description of the Invention] Part 1 of Product-2 The present invention is a moving device installed in buildings such as high-rise buildings, bridges, steel towers, etc., and used to reduce vibrations caused by earthquakes and wind pressure. This relates to vibration absorbers.

Juren! It is well known that these buildings are susceptible to vibration due to earthquakes and wind pressure. For this reason, there is an increasing demand for reducing this vibration from the viewpoints of livability, safety, and strength.

In order to meet these demands, we have already developed an active mass damper system that suppresses the vibration of objects by attaching additional mass to buildings and vibrating the additional mass using actuators or linear motors. A dynamic vibration absorber method that installs a dynamic vibration absorber consisting of a coil spring, an oil damper, etc., and thereby suppresses the vertical vibration of an object ■ A dynamic vibration absorber method that uses a gravity pendulum on a building to suppress vibrations. Systems such as a pendulum dynamic vibration absorber system have been proposed.

However, each of these methods has various problems. In other words, for example, the active mass damper method: ■ is expensive, ■ requires power, ■ requires maintenance, and cannot perform its function in the event of a power outage (there is a risk of power outage during an earthquake). (Many) - Requires advanced control technology - Difficult to control in two horizontal directions (X and Y)
Additionally, the vertical dynamic vibration absorber method has problems such as (1) it is not effective against horizontal vibrations;

Therefore, the present invention solves the above-mentioned problems in the conventionally proposed methods and eliminates the need for power.
The object of the present invention is to obtain a new dynamic vibration absorber having characteristics such as being able to freely set the natural period in the two horizontal directions of , X, and Y.

In order to achieve this object, the present invention is based on the first part of the attached drawings.
~4 As shown in Figure 4, two sets of parallel rails Rx, Ry are spaced apart in the vertical direction and arranged orthogonal to each other.
and two sets of linear motion devices movably attached to each set of parallel rails Rx and Ry. ．． 2.
and these linear motion devices2. ．． 2. Three sets of frame members 1, 2.3 are supported on each parallel rail R and are movable horizontally relative to each other on Ry, and in order to obtain a natural period, each rail Rx, To the 2 @ tension springs placed in parallel to the Ry group.

KY, and attenuators Cx and C arranged in parallel with KY in order to dampen each member 1, 2.3.
It is characterized by a dynamic vibration absorber consisting of y.

艷-U The present invention has the above-mentioned configuration, in which the lower frame member 1 is installed horizontally on the object to absorb vibrations, and a suitable size is placed on the upper frame member 3. When used with an additional mass 10 having a mass of 1, the horizontal vibrations in the x and y directions received by the additional mass 10 are caused by the tension spring Kx.

It is attenuated by the action of Ky and attenuators Cx and Cy.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 8 of the accompanying drawings showing embodiments thereof.

First, as shown in FIGS. 1 and 2, the dynamic vibration absorber according to the present invention has a lower frame 1 having a substantially hollow square planar outline, and a similar hollow square planar outline having smaller dimensions. An intermediate pedestal 2, which has a cylindrical shape, and an upper pedestal 3, which has a planar contour with substantially the same dimensions as the lower pedestal 1, are stacked on top of each other.

As shown in FIG. 3, the lower frame 1 has a pair of X-direction rails Rx symmetrically parallel to its X-direction centerline x-x between the two sides in the Y-direction (this They are arranged horizontally at intervals, and on top of these rails Rx, an intermediate pedestal 2 is movably placed by an X-direction linear movement device 21 provided protrudingly at the four corners of its lower surface. In addition, between the pair of rails Rx in the X direction, a pair of guide rods Cx are arranged horizontally and symmetrically parallel to the center line XX in the X direction. A pair of spring mounting members 51 are movably arranged at intervals in the X direction symmetrically with respect to the center line Y-Y in the Y direction by these guide rods Gx. Between the spring attachment members II, a number of X-direction tension springs Kx spaced apart in the Y-direction are arranged symmetrically with respect to the X-direction centerline x-x, and the Each end is fixed to these spring attachment members 51.Furthermore, these spring attachment members 5 are prevented from approaching each other in the direction by a stopper Sl attached to the guide rod Gx. The tension springs Kx are kept in tension at all times.Furthermore, from the lower surface of the intermediate frame 2, a large number of stopper members 2□ are arranged symmetrically with respect to the center line Y-Y in the Y direction. It is aligned with each stopper S1 in the Y direction and hangs down, so as to be in constant contact with the opposing surface of each spring mounting member 51.

Furthermore, between the intermediate frame Z and the lower frame 1, there is a
They are interconnected by a set of x-direction attenuators Cx interconnecting the side walls facing each other in direction.

On the other hand, on the lower surface of the upper frame 3, as shown in FIG. 4, a pair of Y-direction rails Ry are arranged horizontally and spaced apart symmetrically with respect to the Y-direction center line Y-Y. , these rails Ry are arranged so as to be movable horizontally in the Y direction by a Y direction linear motion device 23 provided protruding from the four corners of the upper surface of the intermediate frame 2, and these rails Ry are arranged so as to be movable horizontally in the Y direction. Similarly, a pair of guide rods Gy are arranged horizontally between the rails R, parallel to each other and symmetrically with respect to the center line Y-Y in the Y direction. , a pair of spring attachment members 52 are movably arranged symmetrically with respect to the center line x-x in the X direction. center l1tY
A number of Y-direction tension springs Ky, arranged horizontally and symmetrically with respect to -Y, are each fixed at each of their ends.

Note that these spring attachment members 5□ are prevented from approaching each other in the mutual direction by respective stoppers S2 attached to the guide rod ay, and these tension springs are kept in a constant state of tension. There is.

Note that the center 41X in the X direction is marked on the upper surface of the intermediate frame 2.
- several stopper members 2 installed symmetrically with respect to X;
．． is arranged so as to be in contact with the spring mounting member 52 in the X direction. In addition, the upper mount 3 and the middle mount 2
The side walls facing each other in the Y direction are interconnected by a set of Y direction attenuators Cy.

In addition, on the side walls facing each other in the Y direction of the lower frame 1,
X-direction stop member 1 for limiting the maximum movement of the intermediate frame 2 in the X-direction. are installed appropriately near each end of the rail R in the X direction, and similarly, the upper frame 3
Y-direction stop member 3 for limiting the maximum movement in the Y-direction relative to the intermediate frame 2. are appropriately installed near each end of the rail Ry in the Y direction.

Also, the rails Rx and Ry in the X and Y directions and the linear motion device 2. and 23 may be of any structure as long as it can receive radial and reverse radial loads. Further, as the dampers Cx and Cy for the X and Y directions, a friction damper, an oil damper, a magnetic damper, an air damper, a viscous damper, etc. can be used.

The device of the present invention has the above-mentioned configuration, and is installed by placing the lower frame 1 horizontally on an appropriate location of G, such as a building where vibrations are to be prevented. An additional mass 10 having a suitable mass -0 on top of the upper pedestal 3
It is used by placing the .

The apparatus of the present invention installed in this manner has an additional mass 10 placed on the upper pedestal 3. and upper pedestal 3
Total mass constraint with its own mass −,. +141 is the additional mass to this device, but this additional mass -0
The size of ÷tan is the target t! Approximately 1150 ~ of the structure weight
The relative movement between the lower pedestal 1 and the intermediate pedestal 2 when a vibration is applied horizontally in the X direction, for example, is shown in FIG. 5. In other words, (^) in the same figure indicates a stopped state, but
In this state, if the intermediate pedestal 2 moves relative to the lower pedestal 1 to the right in the figure, as shown in FIG.
As shown in the left spring mounting member 5. is prevented from moving in that direction by the stopper S1, so
The tension spring Kx is attached to the right spring housing member 5. is moved a distance of δ in that direction by the stopper member 2□ of the intermediate pedestal 2, the tension spring in the On the other hand, when the intermediate frame 2 moves to the left in the figure relative to the lower frame 1, the spring mounting member 51 on the right side similarly prevents the movement by the stopper S on the same side. Blocked, the left spring mounting member 51 is free to move to the left a distance δ and stop with the same amount of spring extension δ. In addition, both X-direction attenuators Cx act on the extension of the tension spring x, and the relative movement of the intermediate frame 2, and therefore the upper frame 3, with respect to the lower frame 1 in the X direction. decay rapidly.

In addition, although the case of the relative movement in the X direction between the lower mount 1 and the intermediate mount 2 has been explained above, the relative movement of the upper mount 3 in the Y direction with respect to the intermediate mount 2 also applies to the intermediate mount 2 and the intermediate mount 2. It is clear that the vibration is rapidly damped by the action of the Y-direction tension spring Ky and the Y-direction attenuator cy arranged between the upper frames 3.

In this case, the arrangement shown in FIG. 5 provides a design that can absorb a large amount of displacement for practical purposes. On the other hand, as shown in FIG. 6, linear motion devices i2. ．． 2. , and by connecting each spring mounting member 50.2 on the spring guide x, y to a separate tension spring on the opposite side wall of the lower or upper frame 1.3, respectively, by x, y. A suitable design can be obtained when limited to displacement. However, in this arrangement, the tension springs Kx, y are stretched in advance by an amount equal to or more than the displacement of each linear motion device 2. ．． 2. shall be attached to.

Next, FIG. 7 shows an example of displacement vibration during an earthquake when the device of the present invention is installed in a tower-shaped building. In the same figure, the vertical axis represents displacement in cm, and the horizontal axis represents time in See.The solid line represents the case where the device of the present invention is installed, and the broken line represents the case where it is not installed. The effects of the device of the present invention are clear from these diagrams.

In addition, Fig. 8 is a diagram showing the effect of the layer shear force of a structure. In the figure, the vertical axis shows the number of stories, and the horizontal axis shows the maximum shear force. Furthermore, the solid line shows the case where only the structure is installed, and the broken line shows the case where the device of the present invention is installed. From these diagrams, it is clear that the effect of the device of the present invention is The effect on shear force is also obvious.

Light acclimatization and arm arrest - As described above, the dynamic vibration absorber according to the present invention has an additional snow amount of
It can move freely in both the X and Y horizontal directions, and by adjusting the tension spring, the natural period of the dynamic vibration absorber and the primary period of the target structure can be made to match. It is possible to suppress the vibration of the target structure by making it resonate with the structure, converting the vibration energy of the target structure into kinetic energy of the dynamic vibration absorber, and then converting it into thermal energy with the vibration absorber attached to the dynamic vibration absorber. The object of the present invention is to provide a new dynamic vibration reducer that is possible and eliminates all the various drawbacks and problems of conventionally known ones. That is, the effects of the present invention are specifically enumerated as follows.

■Since no power is required, maintenance is simple and easy. ■Different natural periods can be easily set in the X and Y directions.■ Large movable displacements can be taken, and wind pressure It can withstand typhoons and large earthquakes.It has a simple structure and can be applied to a wide range of structures.It has a constant natural period regardless of displacement amplitude.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
Its side view, Figure 3, is taken from III-III in Figures 1 and 2.
4 is a sectional view taken along the line IV-IV, and FIG. 5 is an explanatory diagram showing the action of the present invention.
FIG. 7 is a plan view showing a main part of another embodiment of the present invention; FIG. 7 is a diagram showing an example of displacement vibration of the structure when the device of the present invention is installed in a tower-like structure; FIG. 8 is a diagram showing the effect of shear forces on each layer of the structure of FIG. 7. 1, Z, 3... Upper, middle, lower frame, 2. ．． 23・
・Linear motion device, 10...additional mass, Cx, Cy...
・Attenuator, Gx, 11...Spring guide, Kx, Ky
...Tension spring, Rx, Ry...Horizontal rail.

Claims (1)

[Claims] 1. Two sets of parallel rails arranged vertically at intervals and perpendicular to each other, and two sets of straight lines movably attached to each set of parallel rails. A motion device, three sets of frame members supported by these linear motion devices and allowed to move freely relative to each other horizontally on each parallel rail, and a set of frame members for each rail to obtain a natural period. A dynamic vibration absorber comprising two sets of tension springs arranged in parallel to each other, and a damper arranged in parallel to each tension spring to dampen each frame member. 2. Each set of linear motion devices is arranged above and below the four corners of a hollow intermediate pedestal whose planar outline is approximately square, which is one of the frame members, and the lower set of linear motion devices The frame member is movably placed on a pair of parallel rails horizontally arranged between the opposing side walls of a hollow lower pedestal with an approximately square planar outline. The set of linear motion devices movably moves on a pair of parallel rails horizontally disposed between the opposing side walls of the lower surface of a hollow upper frame whose planar outline is approximately square as one of the frame members. In addition, a pair of spring guides are arranged between the opposing side walls of the lower pedestal in parallel to the parallel rails installed thereon, and a pair of spring mounting members are placed above these to face each other. several sets of tension springs are arranged between these spring mounting members, and these spring mounting members are prevented from moving in mutual directions by stoppers attached to the spring guides. Furthermore, stopper members are suspended from the lower surface of the intermediate mount so as to be in contact with the opposing surfaces of the spring mounting member, and stopper members are attached to the lower surface of the upper mount on the opposing side walls. A pair of spring guides are attached in parallel to the parallel rails, and a pair of spring attachment members movably attached to the spring guides are arranged opposite to each other on the upper surface of the intermediate frame. These spring attachment members are interconnected by tension springs, and movement of these spring attachment members toward each other is prevented by stoppers attached to the spring guides, and these spring attachment members are contacted from the underside of the upper frame. The dynamic vibration reducer according to claim 1, wherein the stopper member is suspended as shown in FIG. 3. The dynamic vibration absorber according to claim 2, wherein a damper is arranged in parallel with a tension spring between the upper and lower frames and the intermediate frame, respectively. 4. The dynamic vibration reducer according to claim 1, 2 or 3, wherein the linear motion device and the parallel rail are configured to receive radial and reverse radial loads. 5. The dynamic vibration reducer according to claims 1 to 4, wherein the damper is comprised of a friction damper, an oil damper, a magnetic damper, an air damper, a viscous damper, or the like. 6. Claims 3, 4 or 5, in which one set of tension springs is disposed between the spring mounting member movably mounted on the spring guide and the opposing side walls of the lower or intermediate frame. Dynamic vibration absorber as described in section.