JP2003056199A - Vibration control device using inertia force, installed between stories of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device using inertia force, installed between the stories of a building, capable of acquiring sufficiently large damping without occupying a large installation space. SOLUTION: This vibration control device is provided with an amplifying mechanism 20 provided between the stories of the upper and lower floors of the building 2 and amplifying motion between the stories to output it to an output end, and an added mass body 32 mounted to the output end of the amplifying mechanism, and controls the vibration of the building by the inertia force of the output end. A rack and pinion mechanism 22 can be used as the amplifying mechanism 20. A first mounting member 24 installed extending from the upper floor, and a second mounting member 26 extending from the lower floor and installed parallel along the first mounting member 24, are provided in a frame surrounded by the columns 6 and beams 8 of the building, and both the first mounting member 24 and second mounting member 26 are provided with a pair of racks 28a, 28b to each other. A pinion 30 at the output end is held between a pair of racks 28a, 28b and meshed with them. A weight 32 of the added mass body is mounted to the pinion 30. It is preferable to form the first mounting member 24 as a brace 10 with a damper 12 interposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention converts a displacement between layers between upper and lower floors of a building into a motion such as rotation or swing of a mass body, and damps the building by its inertial force. The present invention relates to a vibration damping device that uses inertial force installed between layers.

[0002]

2. Description of the Related Art As shown in FIG.
As a method of absorbing vibration energy, one end of the brace 10 installed in the inner space of the frame surrounded by the pillars 6 and the beams 8 between the layers or a part thereof is interposed with a damper 12 as a mounting member to absorb the vibration energy. Widely adopted. The damping effect when the damper 12 is provided between the layers via the mounting member such as the brace 10 can be explained from the fixed point theory of the building transfer function.

That is, according to this fixed point theory, as shown in FIG. 6, the building transfer function when the damping constant of the damper 12 is zero and the building transfer function when the damping constant of the damper 12 is infinite. The intersection of is the point where the building transfer function always passes, no matter what value the damping constant of the damper 12 is set to. Then, this point is called a fixed point of the building transfer function, and the damper 12 having a damping constant having a peak at this fixed point is the optimum damper.

[0004]

However, there is a limit to the rigidity of the damper mounting member extending in the height direction in order to transmit the displacement between the upper and lower floors of the building to the damper 12, and the brace 10 has a limit. Even when using as a damper mounting member, generally 10% to 2% of the layer rigidity of the building itself
In many cases, the rigidity is relatively low. In such a case, sufficient vibration energy is not transmitted to the damper 12, and as a result, the damping effect is limited to the extent that the damping constant of the building 2 is increased by several percent.

In other words, in order to obtain a sufficient damping effect,
It is necessary to increase the rigidity of the mounting member of the damper 12, and for that purpose, a large member must be used or the number of installation locations of the damper 12 must be increased, which will result in a reduction in living space and a plan for using the building floor. I was hitting the limit because of the above restrictions.

Also from the viewpoint of the fixed point theory, if the natural frequency when the damping constant of the damper is 0 and the natural frequency when the damping constant is infinite are close to each other, the fixed point is transmitted. Therefore, even if an optimum damper is used in this state, a large damping effect cannot be expected because the fixed point itself is in a high position.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a vibration damping device which can be installed without reducing a living space and which can obtain a sufficiently large vibration damping force. Especially.

[0008]

In order to achieve the above object, in a vibration damping device utilizing inertial force installed between building floors according to the present invention, it is provided between the upper and lower floors of the building,
An amplification mechanism for amplifying the movement between the layers and outputting the amplified movement to the output end;
An additional mass body attached to the output end of the amplification mechanism is provided, and the building is damped by the inertial force of the output end.

Here, the amplifying mechanism may be a rack and pinion mechanism, and an additional mass body may be attached to the pinion.

Further, in a frame surrounded by columns and beams of the building, a first mounting member extending from the upper floor side is installed and a first mounting member extending from the lower floor side is installed in parallel along the first mounting member. And a pair of racks are provided on both the first mounting member and the second mounting member so as to face each other, and the pinion is meshed with the pair of racks. It can also be configured to be sandwiched.

Alternatively, the amplifying mechanism may be a lever mechanism, and an additional mass body may be attached to a swing end of the lever mechanism.

Further, in a frame surrounded by columns and beams of the building, a first mounting member extending from the upper floor side is installed and a first mounting member extending from the lower floor side is installed in parallel along the first mounting member. The second mounting member is provided, and the fulcrum portion is rotatably and pivotally supported by either one of the first mounting member and the second mounting member, and the force point portion is engaged with the other of the first mounting member and the lever mechanism. May be provided.

Further, it is desirable that the mounting member is a brace having a damper at one end thereof.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vibration damping device using inertial force installed between building layers of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a vibration damping device according to the present invention. The vibration damping device of the present invention is basically provided between the upper and lower floors of the building 2, and an amplification mechanism 20 for amplifying the movement between the layers and outputting the amplified movement to the output end, and an output end of the amplification mechanism 20. An additional mass body such as the attached weight 32 is provided, and the building 2 is damped by the inertial force at the output end including the additional mass body.

In the present embodiment, the amplification mechanism 20 described above is used.
As shown in the figure, a rack and pinion mechanism 22 is employed to take out the relative displacement amount in the horizontal direction due to the interlayer displacement of the upper and lower floors as the rotation amount of the output side member. The rack and pinion mechanism 22 is provided in a frame surrounded by the columns 6 and the beams 8 of the building 2. In this frame, one end is fixed to the upper floor side portion of one pillar 6 and extends along the diagonal line of the frame, and one end is fixed to the lower floor portion of the other pillar 6. And a second mounting member 26 extending in parallel along the first mounting member 24.
Rack members 28a, 28b of the rack and pinion mechanism 22 are provided in a pair so as to face each other on both the mounting member 24 and the second mounting member 26, and the pair of racks 28a, 28b.
The pinion 30 is sandwiched between the pinions 30 by meshing with them.

At the other end of the second mounting member 26 on the extending side, a damper 12 is provided by connecting this to the upper beam 8 and the second mounting member 26 is provided with the damper 12. It is configured to function as the brace 10 provided. Here, the damper 12 may be a hydraulic type, a friction type, or the like. In addition, the first mounting member 24 and the second mounting member 26 are provided with a pair of connecting members 34a and 34b for connecting them to each other and maintaining their parallelism. These connecting members 34a and 34b are attached to each mounting member 2
4, 26 are fixed to one of them and slidably engaged with the other. Here, each mounting member 24,
The extending end side of 26 is a fixed portion, and the connecting member 34a
Is fixed near the extending end of the first mounting member 24 and slidably engages with the second mounting member 26, and the connecting member 34b is the second member.
It is fixed near the extending end of the mounting member 26 and is slidably engaged with the first mounting member 24.
The relative movement in the axial direction of is allowed.

A disk-shaped flywheel 36 as an additional mass body is integrally attached to the end surface of the pinion 30, and a plurality of weights 38 are radially arranged at equal intervals as an additional mass body on the outer peripheral surface of the flywheel 36. And is integrally provided. It should be noted that the flywheels 36 of the additional mass body are attached in pairs on both axial end faces of the pinion so that the flywheel 36 sandwiches both sides of the attachment members 24 and 26 to prevent the pinion 30 from falling off from the racks 28a, 28b. It may be done.

In the vibration damping device of the present embodiment having the above-mentioned structure, the building 2 is vibrated by an earthquake or wind,
When interlayer displacement occurs on the lower floor, the first and second mounting members 2
4, 26 are kept parallel to each other by the connecting members 34a, 34b, and relatively move in opposite directions along the axial direction, respectively, and the racks 28 of the first and second mounting members 24, 26 are accordingly moved.
The pinion 30 meshed with the a and 28b rotates integrally with the flywheel 36 and the weight 32 of the additional mass.

Therefore, the rotary mass body composed of the pinion 30, the flywheel 28 and the weight 32 constitutes a rotary inertia mechanism, and a rotary inertia force is generated in accordance with the interlayer displacement of the building 2. Then, the rotational inertial force can be used as a reaction force to suppress the building 2. At this time, with respect to the interlayer displacement load, the second mounting member 26 mainly functions as the brace 10 and receives it as a compressive force in the axial direction having a large strength, so that a large amount of interlayer displacement is sufficiently accommodated. Therefore, even if an excessive interlayer displacement occurs between the upper and lower floors of the building 2 due to a large earthquake or the like, the vibration damping function can be sufficiently ensured.

As is well known, the rotational inertial force varies depending on the rotational speed of the pinion 30 and the flywheel 36 of the additional mass body, the mass of the weight 32 and the radius of rotation thereof, even if the total mass of the flywheel 36 is constant. The magnitude of the rotational inertial force is proportional to the square of the radius of gyration and is proportional to the rotational speed, but the rack 2 due to the interlayer displacement of the building 2
The gear ratio (amplification factor) of the rack and pinion mechanism that converts the reciprocating linear motion of 8a and 28b into the reciprocating oscillating rotary motion of the pinion 30, and the radius of gyration and mass of the weight 32 that is the additional mass body are appropriately set. As a result, a desired rotational inertial force (that is, damping force) can be easily obtained.

That is, the natural frequency when the damping constant of the damper 12 is infinite is determined by the rigidity of the mounting members 24 and 26. If the rigidity cannot be changed, the damper 1
It is sufficient to devise to lower the natural frequency when the damping constant of 2 is zero. Then, in order to lower this natural frequency, the inertia term in the vibration equation should be increased.As a method for that, the rack displacement that extracts the relative displacement in the horizontal direction of the upper and lower floors as the rotation amount of the output side member as described above is used. Using the pinion mechanism 22, it becomes useful to assemble a rotary inertia mechanism that converts the interlayer displacement into the rotary inertia force of the mass body.

As described above, the rotary inertia mechanism increases the radius from the rotary shaft to the installation position of the weight of the additional mass, so that the total mass of the rotary mass body is kept the same,
A rotational inertial force proportional to the square of the radius can be obtained, and thus a large inertial force can be obtained with a small load mass. Therefore, it is possible to easily reduce the natural frequency while making the device compact and lightweight. However, when the inertia mechanism such as the rack and pinion mechanism 22 is used, a new resonance point is formed by the inertia mechanism and the mounting members 24 and 26.
This resonance point appears at a frequency higher than the natural frequency when the damper 12 is infinite. When this frequency approaches the natural frequency when the damper 12 is set to infinity, a fixed point with a high transmissivity is newly formed, so that the optimum value for the size of the inertia mechanism and the damping constant of the damper 12 is set. Will exist. Therefore, by adjusting these, the transmissibility at the fixed point can be significantly reduced as compared with the case where the inertial mechanism is not used, and thus a large damping effect (increase in damping) can be realized.

FIG. 2 shows the mass of the rotary inertia mechanism of the vibration damping device in the lowermost layer under the condition that the rigidity of the damper mounting members 24 and 26 in the embodiment of FIG. 1 is 10% of the rigidity of the building 2. The mass of the rotary inertia mechanism of the middle layer is adjusted to the third frequency, the mass of the rotary inertia mechanism of the uppermost layer is adjusted to the second frequency, and each layer is adjusted for the primary frequency. The damping function of the damping device of Fig. 2 represents the transfer function of the result obtained by arranging the optimum damper of the fixed point theory. In this way, it is also possible to achieve a greater damping effect by adjusting all layers to a specific order.

On the other hand, FIG. 6 shows an optimum damper according to the fixed point theory under the condition that the rigidity of the damper mounting member (brace 10) is set to 10% of the layer rigidity of the building itself in the conventional vibration damping device of FIG. 12 shows the result of the transfer function when 12 is arranged and the peak of the transfer function is lowered. 3 and FIG. 7, the same phenomenon that the damping effect is improved by additionally using the rotary inertia mechanism by the rack and pinion mechanism 22 in addition to the brace 10 having the damper 12, Force (force applied to the brace)
The physical aspect of the phase delay is that, as shown in these figures, in the present embodiment of FIG. 3, by installing an inertia mechanism, the response (control force) to the deformation speed between layers is controlled. Since the phase is advanced by 180 degrees, there is no phase delay as in the conventional example of FIG. Further, the table below shows a comparison of the damping constants of this embodiment and the conventional example. From the table, the damping constant is 3 by using the rotary inertia mechanism.
It can be seen that it is more than doubled.

[0025]

[Table 1]

Further, since the rotary inertia mechanism composed of the rack and pinion mechanism 22 can be made compact and lightweight,
It can be installed and stored in the space within the pillar / beam frame without being restricted by the plan for using the building plane. Therefore, it is not necessary to secure a large installation space and the living space is not reduced.

FIG. 4 is a side view showing another embodiment of the present invention. In this embodiment, a case where a lever mechanism 38 in which a weight 32 as an additional mass is attached to the swinging end is adopted as the amplifying mechanism 20 and the inertial mechanism for amplifying the inter-layer movement in the vibration damping device and outputting it to the output end is exemplified. is doing. That is,
The first mounting member 24 and the second mounting member 26 have levers 38a. 38b are attached as a pair. One of the first levers 38a has an elongated hole 4 formed at one end as a force point portion 40 along the longitudinal direction.
2 is engaged with an engagement pin 44 provided upright on the first attachment member 24, and the central portion is pivotally supported as a fulcrum portion 46 by a rotary shaft 48 provided upright on the second attachment member 26. A weight 32 is attached as an additional mass to the swing end of the end. Contrary to the first lever 38a, the other second lever 38b has a central fulcrum portion 46 pivotally supported by the rotary shaft 48 of the first mounting member 24, and an elongated hole formed at one end as a force point portion 40. 42 is engaged with the engagement pin 44 of the second attachment member 26.

Further, according to this structure, the interlayer displacement generated between the upper and lower floors of the building 2 is caused by the first and second mounting members 24, 2
6 is transmitted as a relative movement in the opposite direction along the axial direction, the first lever 38a and the second lever 38b are oscillated about the fulcrums 46, and the weight 3 at the oscillating end is rotated.
2 reciprocally swings and rotates to generate an inertial force, and the inertial force acts as a reaction force to exert a vibration damping effect. Even in this case, by setting the mass of the weight 32, its radius of gyration, and the lever ratio as an amplifying mechanism, the inertial force can be set at a fixed point in comparison with the conventional case in which the inertial mechanism is not used. It is possible to easily and drastically reduce it, and thus a large damping effect (increasing damping) can be realized. Further, the inertia mechanism by the lever mechanism 36 is similar to that of the above-described embodiment.
Since it can be housed and installed in the space inside the frame surrounded by the pillars 6 and the beams 8, there is no need to secure a particularly large installation space and the living space is not reduced.

In the above description of each embodiment, the amplification mechanism 2 that amplifies the movement between layers and outputs the amplified movement to the output end.
Although the rack and pinion mechanism 22 and the lever mechanism 36 are illustrated as the zero and the inertia mechanism, the present invention is not limited to these, and a ball nut mechanism or a toggle mechanism having a weight as an additional mass body may be adopted. it can.

[0030]

As described above in the embodiments, in the vibration damping device utilizing the inertial force according to the present invention, the movement between the floors of the upper and lower floors of the building is amplified and output to the output end. In addition to providing an amplifying mechanism for outputting, an additional mass body is attached to the output end of the amplifying mechanism to form an inertia mechanism, and the interlayer displacement generated between the upper and lower floors of the building due to an earthquake, wind, etc. Since the inertial force is generated by converting the motion into motion and transmitting it, the building can be damped by the inertial force.
Further, by using the inertia mechanism, it is possible to prevent a phase delay from occurring in the response (control force) to the deformation speed between layers, and it is possible to significantly improve the vibration damping force.

The amplification mechanism and the inertia mechanism are a rack and pinion mechanism in which the additional mass body is attached to the pinion or a lever mechanism in which the additional mass body is attached to the swinging end, and the additional mass body is reciprocally rocked and rotated to rotate. When the inertial force is generated, the magnitude of the rotational inertial force is proportional to the square of the radius of gyration and proportional to the rotational speed. Therefore, the reciprocating rectilinear motion of the interlayer displacement of the building is converted into the gear of the rack and pinion mechanism. By appropriately setting the ratio (amplification factor), the lever ratio of the lever mechanism, and the radius of rotation and the mass of the additional mass body,
A desired rotational inertial force (that is, damping force) can be easily obtained, and a large inertial force can be obtained with a small load mass. Therefore, it is possible to easily reduce the natural frequency while making the structure compact and lightweight.

Further, since the rotary inertia amplifying mechanism composed of the rack and pinion mechanism and the lever mechanism can be constructed in a small size and a light weight, it is possible to prevent the pillar / column from being restricted by the plan for using the building plane.
It can be installed and stored in the space inside the beam frame, so there is no need to secure a large installation space, and the living space is not reduced.

Further, when the mounting member is a brace having a damper, a resonance point is formed by the inertial mechanism and the mounting member which can further accelerate the vibration damping of the building, but the damping constant of the damper is fixed. By adjusting the size of the inertial mechanism by setting it to the optimum value of theory, it becomes possible to significantly reduce the transmissibility at a fixed point compared to the case where the inertial mechanism is not used. Can be realized).

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vibration damping device according to the present invention.

FIG. 2 is a graph showing a transfer function of a building provided with the vibration damping device of FIG.

3 is a graph showing a phase relationship of control force with respect to response speed of a building provided with the vibration damping device of FIG.

FIG. 4 is a schematic configuration diagram showing another embodiment of the vibration damping device according to the present invention.

FIG. 5 is a schematic configuration diagram of a conventional vibration damping device in which a damper is interposed in a brace.

6 is a graph showing a transfer function of a building provided with the conventional vibration damping device of FIG.

7 is a graph showing a phase relationship of control force with respect to a response speed of a building provided with the conventional vibration damping device of FIG.

[Explanation of symbols]

2 buildings 6 pillars 8 beams 10 braces 20 Amplification mechanism 22 Rack and pinion mechanism 24 First mounting member 26 Second mounting member 28 racks 30 pinion 32 weights (additional mass body) 36 Flywheel (additional mass body) 38 Lever mechanism 38a, 38b lever 40 Power point 46 fulcrum

Claims (6)

[Claims] 1. An amplification mechanism, which is provided between upper and lower floors of a building, amplifies movement between the layers and outputs the amplified movement to an output end, and an additional mass body attached to an output end of the amplification mechanism, A vibration damping device that uses inertial force installed between building layers, characterized by damping the building with inertial force at the output end. 2. The vibration damping device utilizing inertial force installed between building buildings according to claim 1, wherein the amplification mechanism is a rack and pinion mechanism, and an additional mass body is attached to the pinion. . 3. A first mounting member extending from the upper floor side and installed in a frame surrounded by columns and beams of a building and extending parallel to the first mounting member extending from the lower floor side. A second mounting member is provided, the racks are provided in a pair on both the first mounting member and the second mounting member so as to face each other, and the pinion is meshed with these between the pair of racks. The vibration damping device utilizing inertial force installed between the building layers according to claim 2, wherein the vibration damping device is sandwiched between the building layers. 4. The inertial force installed between the building layers according to claim 1, wherein the amplification mechanism is a lever mechanism, and an additional mass body is attached to a swing end of the lever mechanism. Vibration control device. 5. A first mounting member extending from the upper floor side and installed in a frame surrounded by columns and beams of a building and a first mounting member extending from the lower floor side and installed in parallel along the first mounting member. And a fulcrum portion is rotatably supported by either one of the first attachment member and the second attachment member, and the force point portion is engaged with the other of the lever attachment mechanism. The vibration damping device using the inertial force installed between the building layers according to claim 4, wherein the vibration damping device is provided. 6. The vibration damping device using inertial force installed between building layers according to claim 3, wherein the mounting member is a brace having a damper at one end.