JPH03239836A - Damping device - Google Patents

Abstract

PURPOSE:To quickly suppress the vibration of a structure by transferring the vibration energy of a weight to outer and inner frames, which can perform parallelogram movement perform, and by controlling it by attenuators. CONSTITUTION:When vibration energy is given to a structure 1, an outer frame 3 and inner frame 4 move at a delay of 90 deg. in relation to the structure 1. The moves of this outer frame 3, inner frame 4, and the weight 7 on the frame 4 are controlled by attenuators 18 and 19. The controlled move of this weight 7 damps the structure 1. The vibration energy given to the structure 1 is converted into the kinetic energy to the weight 7, and this energy is indirectly consumed by the attenuators 18 and 19. Thus, the vibration of the structure can effectively be suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is installed on the top of structures such as suspension bridge towers, skyscrapers, towers, and steel towers to prevent vibrations caused by wind loads (aerodynamic forces) of these structures. This invention relates to a vibration damping device used to suppress the vibration amplitude caused by an earthquake and quickly dampen the vibration.

[Prior Art] Conventionally, as a vibration damping device for this type of structure, for example, as shown in FIG. The tank C is equipped with a large amount of liquid d such as water, and the shaking of the structure a is suppressed by the sloshing phenomenon caused by the liquid d in the tank C moving from side to side while passing through a wire mesh. [Building Tower J
(published in December 1988), and a text entitled "Technological development of vibration control and seismic isolation structures" at the Japan Building Center Information Exchange Seminar on New Building Structural Technology.
(October 2003, published by the Japan Building Center Foundation)] Or, as shown in Figure 8, on the top of structure a,
A laminated rubber e formed by laminating multiple layers in the vertical direction is installed, and a weight f is supported on the upper end of the laminated rubber e. A device that suppresses vibration by vibrating has been proposed.

[Problems to be Solved by the Invention] However, among the conventional methods described above, in the case of the example shown in FIG. 7 in which the liquid d in the tank C is sloshed, Because there are
0 The liquid d moves through a wire mesh in the tank C, but it is difficult to change its attenuation rate. 0 The natural period of the structure a and the equipment itself There are problems such as difficulty in tuning the natural period, poor responsiveness, and (a) inability to make large strokes.On the other hand, the In the case of the example shown in Fig. 8, (D) the weight f is supported by the laminated rubber e, so the mass of the device cannot be made too large; 0) the damping rate is determined by the laminated rubber; (g) It is difficult to synchronize the natural period of the device itself with the natural period of the structure a; 0 The life is short because the laminated rubber e deteriorates; (7) A large amplitude cannot be obtained. There are problems such as not having one.

Therefore, the present invention attempts to solve the problems of the above-mentioned conventional methods and reduce the vibration of the structure by converting the vibration energy given to the structure into the kinetic energy of the weight and efficiently damping it. It is something to do.

[Means for Solving the Problems 1] In order to solve the above problems, the present invention provides a plurality of pillars erected on a base so as to be freely rotatable, and an upper end of each of the pillars is rotatably attached. an outer frame is constructed by assembling upper structural members such as An inner frame is constituted by assembling a lower structure member to which the lower end of each of the pillars is rotatably attached so that it can move in a parallelogram in the same direction as the movement direction of the outer frame, and the lower structure of the inner frame Attach a weight to the material and
A damping machine is provided to control the movement of the inner frame, and springs are diagonally stretched between the columns of the outer frame and between the columns of the inner frame that face each other in the direction of movement.

[Function] When shaking energy is applied to a structure, the outer frame and inner frame move 90 degrees behind the structure. The movement of the outer frame, the inner frame, and the weights on the inner frame is controlled by a damping machine, and the controlled movement of the weights damps the vibration of the structure. In this way, the shaking energy given to the structure is converted into kinetic energy of the weight, and this energy is indirectly consumed by the speed reducer, so that shaking of the structure can be effectively suppressed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, in which a base 2 is provided on the top of a structure 1 that vibrates in response to external force,
An outer frame 3 is constituted by assembling a plurality of columns 5 rotatably erected on the base 2 and an upper structural member on the columns 5 so as to perform parallelogram motion. An inner frame 4 is constructed by assembling a plurality of struts 6 whose upper ends are rotatably supported by upper structural members and suspended, and a lower structural member supported by the lower ends of the struts 6 so as to perform parallelogram motion. on the inner frame 4 so that the movement direction of both frames 3 and 4 is the same, or in the same direction.
By attaching a plow 7 as a structure vibration damping body, when shaking occurs in the structure 1, it is made to vibrate in the left-right direction together with the inner frame 4 via the weight 5 or the outer frame 3. To suppress the shaking of the structure 1.

To be more specific, four pillars 5 are erected at front, rear, left and right positions on the base 2 so as to be rotatable in the left and right directions by means of respective hinges 8, and the pillars 5 are opposed to each other so as to be integrated. The upper ends of the left and right columns 5 are connected by a cross member 9 as an upper structural member so as to be rotatable in the left-right direction via a hinge 8, and the ends of the horizontal member 9 are connected by a vertical member 10 as an upper structural member. are connected to constitute an outer frame 3, and the outer frame 3
can be freely swung in the left-right direction using the base 2 as a base, like a parallelogram link. Furthermore,
At both ends of both vertical members 10 as upper structural members of the outer frame 3, the upper ends of four columns 6, which are shorter in length than the columns 5 of the outer frame 3, are attached to the left and right using hinges 12. The lower ends of the opposing left and right columns 6 are connected to a horizontal member 11 as a lower structural member via a hinge 12 so as to be rotatable in the left and right direction so that the columns 6 are integrated. , the center portions of the horizontal members 11 are connected by a horizontal plate 13 as a lower structural member to constitute an inner frame 4, and the inner frame 4 is supported by the outer frame 3 and extends in the horizontal direction as a parallelogram link. It is possible to freely oscillate and displace the object. Further, the inner frame 4 has a horizontal plate 1.
A weight 1 with a large specific gravity, such as lead, is fixed in the center of 3,
In order to enable the weight 7 to vibrate integrally with the inner frame 4 like a pendulum that makes a single string vibration, and to make the vibration period of the weight 7 correspond to the natural period of the structure 1, the outer frame 3 is Springs 14 and 15 are disposed diagonally across between the columns 5 that face each other in the left and right direction and between the columns 6 that face each other in the left and right direction of the inner frame 4, and a large number of holes are provided in each of the columns 5 and 6 along the vertical direction. Holes 16 and 1 at the required positions from among the holes 16 and 17 for spring tensioning that have been prepared.
7 and tension the springs 14 and 15, respectively. Furthermore, a damper 19 is interposed between the lower surface of the horizontal plate 13 of the inner frame 4 and the base 2, facing in the left-right direction, and a damper 19 is interposed between the lower surface of the horizontal plate 13 of the inner frame 4 and the base 2. Similarly, a damping machine 18 is installed as an auxiliary intervening device between the weight 7 and the vibration energy of the weight 7. so that each can be controlled by The damping devices 18 and 19 may be oil dampers whose damping rate can be changed by changing the internal pressure, or oil dampers whose damping rate can be changed by changing the internal air sealing pressure. Any type of liquid, gas, or mechanical force may be used, such as an air damper or a spring that changes the damping rate by changing its length.

When the vibration damping device of the present invention having the above-mentioned configuration is installed on the top of the structure 1 as shown in FIG. is outer frame 3 and inner frame 4
Since the vibration is transmitted to the plow 7 through the swinging displacement of the outer frame 3 and the inner frame 4, the weight 7 starts a single string vibration 90 degrees behind the swinging of the structure 1.

At this time, since a damping machine 18 is interposed between the outer frame 3 and the base 2, and a damping machine 19 is interposed between the inner frame 3 and the base 2, the outer part including the weight 7 The vibration of the frame 3 and the inner frame 4 is damped by the damper 18.1
As a result of being attenuated by 9, the shaking of the structure 1 is suppressed. That is, in the present invention, energy such as aerodynamic force entering the structure 1 is converted into kinetic energy of the weight 7, and this is consumed by attenuation 1i18.19 through the displacement of the outer frame 3 and the inner frame 4. The shaking of the structure 1 can be quickly suppressed by indirect energy consumption.

In the above, the damping force on the structure 1 is the mass of the weight 7,
It can be changed by selecting the vibration stroke. In this case, the weight 7 can be made of a material with a high specific gravity such as lead, and the weight 7 is fixed on the horizontal plate 13 which is the lower structural material of the inner frame 4 to lower the center of gravity. Therefore, the entire device can be downsized and the installation space can be reduced. Also, outer frame 3
Since the inner frame 4 is displaced so as to perform the motion of a parallelogram link, a large vibration stroke can be achieved.

Furthermore, the weight of the weight 7 can be reduced.

On the other hand, the attenuation rate can be set to an optimum state by adjusting the attenuators 18 and 19. Furthermore, each pillar 5
and 6 are provided with a large number of holes 16 and 17 for tensioning the springs, respectively, so by selecting the positions of these holes 16 and 1γ and tensioning the springs 14 and 15, the vibration damping device itself can be The period can be easily tuned to the natural period of the structure 1. Here, spring 14
If the spring constant of spring 15 is 7, the spring constant of spring 15 is 2, and the period of spring 7 is 3, then the equivalent spring constant is T = ω2 (ω: the natural period of the structure >.Also, if the tensioning position of springs 14 and 15 is changed,
If the spring constant is 1, k I' N k2 becomes 2', so even if the natural period of the structure 1 changes, it can be easily accommodated.

Next, FIG. 5 shows another embodiment of the present invention, in which a spring 14 is disposed diagonally between the left and right columns 5 of the outer frame 3, and a spring 15 is disposed diagonally between the left and right columns 6 of the inner frame 4. Compression, instead of the method of mounting
Tension type springs 14 and 15 are installed diagonally in parallel between the columns 5 and 6, respectively.

In the case of the embodiment shown in FIG. 5, the same effects as in the above embodiment can be obtained.

FIG. 6 shows still another embodiment of the present invention, in which a damper 18 is installed between the base 2 and the strut 5 of the outer frame 3.
Also, instead of the method in which damping machines 19 are interposed between the base 2 and the horizontal plate 13 of the inner frame 4, damping machines 18 are installed between the left and right columns 5 of the outer frame 3, and Attenuators 19 are interposed between the left and right columns 6 in an oblique arrangement.

In the case of the embodiment shown in FIG. 6 as well, the same effects as in the above embodiment can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the attenuation F! on the outer frame 3 side may be reduced. It goes without saying that J18 is not necessarily required, and that various other changes can be made without departing from the gist of the vehicle invention.

[Effects of the Invention] As described above, according to the vibration damping device of the present invention, the vibration energy of the weight can be transmitted to the inner and outer frames capable of parallelogram motion, and can be controlled by the damper. Since it has the following structure, it exhibits the following excellent effects.

(1) The shaking energy of the structure can be easily converted into the kinetic energy of the weight, and this can be optimally damped by the damper, so the shaking of the structure can be quickly suppressed.

(11) By selecting the tensioning position of the spring, the natural period of the structure and the natural period of the vibration damping device can be perfectly matched, so a large vibration damping effect can be achieved.

(The 110 weight uses the principle of a pendulum, so it has less friction, is easy to move, and provides reliable operation.

(c) Since weights with high specific gravity can be used, compactness is possible, and therefore the installation area of the entire device can be small.

(V) Since it can have a large stroke and a large weight, it can also be used for large structures.

(b) Since the structure is simple, maintenance is easy.

[Brief explanation of drawings]

FIG. 1 is a front view showing an overview of an embodiment of the vibration damping device of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. FIG. 5 is a schematic diagram showing an example of a vibration damping device in use; FIG. 5 is a schematic diagram showing another example of a spring tensioning method; FIG. 6 is a schematic diagram showing another example of a damping machine installation method; 7 and 8 are both schematic diagrams showing examples of conventional devices. DESCRIPTION OF SYMBOLS 1... Structure, 2... Base, 3... Outer frame, 4... Inner frame, 5, 6... Support column, 7...
・Weight, 9...Horizontal member (upper structure material), 10...Vertical member (upper structure member) 11...Horizontal member (lower structure material), 13.
...Horizontal plate (lower structural material), 14.15...Spring, 18.19...Attenuator. Figure 3

Claims (1)

[Claims] (1) An outer frame constructed by assembling a plurality of columns that are rotatably erected on a base and an upper structural member that is rotatably attached to the upper end of each column so that it can perform parallelogram motion. , and a plurality of struts each having an upper end rotatably attached to the upper structural member of the outer frame for suspension support, and a lower structural member having the lower end of each of the struts rotatably attached to the outer frame. An inner frame is assembled to allow parallelogram motion in the same direction as the frame motion, and a weight is attached to the lower structural member of the inner frame, and a damping machine is provided to control the motion of the inner frame. 1. A vibration damping device, further comprising springs diagonally stretched between each of the columns of the outer frame and between each of the columns of the inner frame that face each other in the direction of motion.