JP2780615B2 - Vibration control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a dynamic vibration absorber having a two-mass system, one of which is tuned to a primary vibration mode of a structure, the other of which is tuned to a secondary vibration mode of a structure. Active vibrations cause the structure
The present invention relates to a vibration control device for reducing not only the second mode but also the second mode vibration response.

[0002]

2. Description of the Related Art As a passive type vibration control device, there is a dynamic vibration absorber.
There are those described in JP-A-63-76932 and JP-A-63-114773. Figure 6 is shows a vibration model of the dynamic vibration reducer to be applied to the construction, the mass m _1, the natural frequency of the main vibration system of the spring constant _{k 1 ω 1 = (k 1} / m 1) 1 / ^{If 2} is close to the frequency ω of the external force, resonance may occur. At this time, a vibration system having a mass m ₂ and a spring constant k ₂ is added and ω = (k ₂ /
It is well known that when the ratio is set to m ₂ ) ^1/2 , the additional vibration system vibrates, but the vibration of the main vibration system stops. An application of this principle is a dynamic vibration absorber.

As an active vibration damping device, there is, for example, an active mass driver described in Japanese Patent Application Laid-Open No. 1-275866-69. 7 is shows a vibration model of Active Mass Driver, the main vibration system of the mass m ₁ and the mass m
An actuator using a hydraulic or electromagnetic force is provided between the additional vibration systems ( ₂ ), the additional mass is forcibly driven, and the reaction force at that time is used to suppress the vibration of the main vibration system.

[0004] Active addition, in parallel with the control force due to the actuator as shown in the vibration model of Fig. 8 with respect to the active mass driver adds the spring of spring constant k ₂ with less control force in comparison with the active mass driver An active tuned mass damper for obtaining a vibration control effect comparable to that of a mass driver has been studied.

Further, in the invention described in Japanese Patent Application Laid-Open No. 63-156171, a second additional mass having a smaller mass than the additional mass of the dynamic vibration absorber is connected to the spring and the actuator via an actuator. An active vibration damping device of a type that controls vibration of a structure due to an earthquake or the like by applying a control force to an additional mass of the device has been developed.

[0006]

As described above, a conventionally developed vibration control device using a combination of a passive vibration control device and an active vibration control device has a model shape shown in FIG. A vibration control device is formed by tuning the vibration period of the vibration control device to the primary natural system, that is, the primary natural period of the structure, and the passive additional vibration control device is driven passively by driving a small additional mass. The purpose is to increase the movement of the additional mass of the mold damper to enhance the control performance.

[0007] Such a conventional vibration control device using a combination of a passive vibration damper and an active vibration damper controls only the primary natural vibration, and has a higher vibration mode like an actual structure. , Complicated vibration control was difficult. Therefore, the present invention provides a vibration control device capable of controlling not only the primary natural vibration but also the secondary natural vibration.

[0008]

[Means for Solving the Problems]Distributed distribution on top of structure
The first additional mass is supported by the laminated rubber
The second additional mass is supported by the laminated rubber that is dispersed and arranged on the amount
The first additional mass and the second additional mass are placed on the second additional mass.
Control force is applied to the added mass in both orthogonal X and Y directions.
And a slidable third additional mass with driving means
The first additional mass has a first order mass of the structure.
Of the structure, and the second additional mass
Vibration control characterized by giving a secondary vibration cycle
It is intended to be a device.As shown in the model of FIG.
Instead of a conventional passive vibration damper, a two-mass dynamic absorber
Are formed, and the first and second natural periods are the main vibration system, that is, the structure.
Synchronized with the primary and secondary natural periods of the structure, respectively
deep. Dynamic vibration absorption of a two-mass system installed on the top of a structurevessel
Is effective for damping primary and secondary vibrations as is
Has a small active mass on top of the two-mass dynamic absorber.
When a mass driver is installed, the motion of the two-mass dynamic absorber
Can be expanded. In other words, active mass driver
By applying a small control force to the actuator of
A large motion can be obtained in the point system dynamic vibration absorber,
Secondary vibration can be effectively controlled.

In the vibration damping device according to the present invention, the two additional masses forming the two-mass system dynamic vibration absorber are capable of vibrating or displacing in all directions in the horizontal plane, and are provided in all directions in the horizontal plane. A damping effect can be obtained. A supporting means for oscillating the two-mass system by vibrating the added mass in all directions of the horizontal plane with the primary and secondary natural periods of the structure is a laminated rubber dispersedly arranged on the floor surface of the structure. As the laminated rubber as the support means, a rubber having a hollow shaft portion to reduce the horizontal rigidity and have a long period, or a highly damped rubber which can be expected to have a large damping property in the rubber itself can be used.

The additional mass of the active mass driver which directly receives the control force from the driving means is provided in two directions to indirectly apply the control force in two directions to the additional mass of the two-mass system dynamic vibration absorber. And the response of the structure can be suppressed in all directions in the horizontal plane. As a means for supporting the additional mass of the active mass driver to be able to vibrate in a specific direction, there is a method of supporting the mass by a linear guide.
Driving means for applying a control force to the active mass driver include, for example, a driving device using an electric motor, a hydraulic driving device, a linear motor, etc., based on the response of a structure due to external vibrations such as wind or earthquake, or the response to earthquake. And driven by the control force analyzed.

The two-mass system dynamic vibration absorber and active mass driver are configured by stacking first and second flat masses in two stages on the top of a structure via laminated rubber. A rack is constructed on the upper second additional mass, and linear guides are provided so as to be orthogonal to the uppermost portion and the second additional mass, respectively, so that the two additional masses of the active mass driver can be slid. There is a way to configure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the illustrated embodiment will be described. FIG.
2 is a side view of one embodiment of the present invention, FIG. 2 is a view as viewed from A in FIG. 1, and FIG. 3 is a view as viewed from B in FIG. First, the entire apparatus is installed on the top of the structure 1, and the first additional mass 3 of the dynamic vibration absorber is supported by the plurality of dispersed laminated rubbers 2. The additional mass of the dynamic vibration absorber is divided into two, and a first additional mass 3 and a second additional mass 5
Similarly, when the first additional mass 3 is supported by the laminated rubber 2, the second additional mass 5 is similarly converted into the first additional mass 3 by the laminated rubber 4.
On top of. Both the first additional mass 3 and the second additional mass 5 can cope with vibrations in all horizontal directions. The primary mode and secondary mode frequencies of the two-degree-of-freedom dynamic vibration absorber composed of the first additional mass 3 and the second additional mass 5 and the laminated rubbers 2 and 4 are respectively used for the primary mode and the secondary mode of the structure. Match the frequency of the mode. If the natural periods are significantly different depending on the X and Y directions of the structure, it is also possible to cope with the problem by changing the cross-sectional shape of the laminated rubbers 2 and 4 or devising an attachment method. Next, the rack 6 is constructed on the second additional mass 5. X on the frame 6 and the second additional mass 5,
The additional masses 7 and 8 of the third additional mass of the two active mass drivers capable of responding in both Y directions can slide.
The linear guides 9 and 10 are laid. The additional masses 7 and 8 are threaded through ball screw shafts 13 and 14 connected to two AC servomotors 11 and 12 as driving means. By the rotation of the ball screw shaft, the two additional masses 7, 8 are moved along the linear guide in the X, Y directions.
Vibration in the direction is possible. In practice, the active mass driver performs a composite vibration in accordance with the vibration components in the X and Y directions, so that it can cope with vibration suppression in all directions in the horizontal plane.

FIG. 9 shows another embodiment in which the active mass driver has one third additional mass . The first additional material of the dynamic vibration absorber with the laminated rubber 2 dispersed on the top of the structure 1
Supporting the quantity 3 and the second attachment of the dynamic vibration absorber with the laminated rubber 4 on it
The supporting of the additional mass 5 is the same as the previous example, but in this example, the AC servomotor 11 is fixed on the second additional mass 5 and the ball screw shaft 13 is attached to the AC servomotor 11.
Then, a female screw is formed on another AC servomotor 12, and the AC servomotor 12 is screwed together so as to be freely movable in the Y direction. The shaft 14 is screwed through the AC servomotor 12 in the X direction perpendicular to the ball screw 13 with another ball screw, and the third additional mass 15 of the active mass driver is screwed through the ball screw shaft 14. , the said third additional mass 15 is free to structure such that the movable able to then attach the casters 16 in a horizontal plane. In this way, the additional mass of the active mass driver may be one, and the X, Y of the AC servomotors 11 and 12 may be sufficient.
Due to the control force in both directions, it is possible to vibrate in all directions in the horizontal plane in a complex manner.

Although an actual building vibrates in a complicated manner due to wind or an earthquake, conventional vibration damping devices only consider the first mode of the building. For example, in lateral vibration of a high-rise building or the like, the behavior of a cantilever supported by the ground takes place, so that a secondary mode vibration appears at a cycle of about 1/3 of the primary mode vibration cycle. The present invention, the added mass of the dynamic vibration reducer 2
The first and second mode vibrations can also be damped by forming a two-mass system dynamic vibration absorber in synchronization with the natural periods of the first and second modes.
Further, by adding an active mass driver to the two-mass system dynamic vibration absorber , the movement of the two-mass system can be expanded, and the vibration damping effect of the structure can be improved. Ma
Active mass dry according to the vibration components in the X and Y directions
All directions in the horizontal plane due to the compound vibration
It can respond to vibration control.

[Brief description of the drawings]

FIG. 1 is a side view showing the structure of the present invention.

FIG. 2 is a view as viewed from A in FIG. 1;

FIG. 3 is a view as viewed from B in FIG. 1;

FIG. 4 is a model diagram of the vibration control device of the present invention.

FIG. 5 is a model diagram of a conventional vibration control device.

FIG. 6 is a model diagram of a dynamic vibration absorber.

FIG. 7 is a model diagram of an active mass driver.

FIG. 8 is a model diagram of an active tuned mass damper.

FIG. 9 shows a third additional material of the active mass driver according to the present invention.
It is a perspective view showing the case where the quantity is one.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Structure, 2 ... laminated rubber, 3 ... 1st additional mass of dynamic vibration absorber, 4 ... laminated rubber, 5 ... 2nd additional mass of dynamic vibration absorber, 6 ... Ka, 7 ... third additional mass in the Y direction of the active mass driver, a third additional mass in the X direction of 8 ... active mass driver, 9 ... Y direction linear guide, 10 ... X-direction Linear guide, 11 ・
..AC servo motor, 12 ... AC servo motor,
13: Y-direction ball screw shaft, 14: X-direction ball screw shaft, 15: Third additional mass of active mass driver, 16: Universal caster

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-49387 (JP, A) JP-A-5-222863 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) E04H 9/02 341

Claims (1)

(57) [Claims] 1. A laminated rubber dispersedly arranged on the top of a structure
Supports the first additional mass, and disperses on the first additional mass.
The second additional mass is supported by the disposed laminated rubber, and the second additional mass is supported.
On the mass, the first additional mass and the second additional mass
And a driver who applies a control force in both orthogonal X and Y directions.
A structure having a third additional mass that can slide with a step,
The first additional mass is given the first vibration cycle of the structure.
In addition, the second additional mass includes a second-order vibration cycle of the structure.
And a vibration control device.