JP2697386B2 - Damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a structure such as a building, and more particularly to a vibration damping device configured to suppress vibration of a structure due to displacement of an additional mass.

[0002]

2. Description of the Related Art For example, in a structure such as a building represented by a building, when a vibration is generated due to an earthquake or wind pressure, a vibration damping device for damping the vibration is provided on the roof of the building. Have been. This type of vibration damping device employs a configuration in which an additional mass having a predetermined weight mainly corresponding to the mass of a building is displaced in accordance with a vibration state.

For example, as shown in FIG. 4, there is a structure in which an additional mass 1 is movable by a roller 3 or the like, and is displaceable by an actuator 7 via a rod 5. Japanese Unexamined Patent Publication (Kokai) No. 2-13667 is an official gazette that describes this kind of technology.

[0005] Alternatively, as shown in FIG. 5, a ball screw shaft 9 penetrating the additional mass 1 is received by a ball screw mechanism 11 provided on the additional mass 1, and the ball screw shaft 9 is rotated by a servo motor 13 to add the additional mass. There are some which make it possible to displace 1. Japanese Unexamined Patent Publication No. Hei 2-350048 discloses this type of technology.

The above technique (FIGS. 4 and 5) relates to an active vibration damping device for controlling displacement of an additional mass in accordance with a vibration state. For example, as shown in FIG. There is also a device provided on the roof of a building or the like via an elastic body such as 4. In this method, a passive vibration damping that suppresses the vibration in the secondary mode is performed by adjusting the size of the additional mass 1, the strength of the spring 4, and the like.

[0006]

However, in order to increase the displacement of the additional mass 1, the rod 5 (FIG. 4)
Alternatively, the ball screw shaft 9 (FIG. 5) must be lengthened. If the ball screw shaft 9 is lengthened, the rod 5 and the ball screw shaft 9 may be buckled, or the shaft rigidity is reduced and the natural frequency of the device system is reduced. For this reason, the damping control is adversely affected. Therefore, there is a limit in increasing the amount of displacement of the additional mass 1. In addition, the power units such as the actuator 7 and the servomotor 13 do not become additional masses for vibration suppression, but are dead loads.

Further, in order to reciprocate the additional mass 1 in accordance with the natural vibration period of the building, a considerably large power of the power unit is required, and accordingly, the size of the apparatus is increased and the equipment cost is high. .

Further, in order to perform the active vibration damping and the passive vibration damping, separate devices must be provided, and two additional masses must be provided, which is uneconomical.

The present invention has been made in view of the above circumstances, and can increase the displacement of an additional mass, can use the weight of a power unit for a part of the additional mass, and save the power of the power unit. It is an object of the present invention to provide an economical vibration damping device that can perform both active vibration damping and passive vibration damping.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and suppresses the vibration of a structure.
Is a vibration damping device provided for
A mass body that is movable in accordance with the
To support this to move with a convex locus
The mass body is combined with a downwardly convex locus
Has a natural frequency equal to the primary natural frequency of the structure
The self-propelled support member and the object
Mass moving means provided on the mass for
The support member including the mass and mass moving means is structured as described above.
To have a natural frequency equal to the secondary natural frequency of the object
Depending on the elastic member to be supported and the vibration state of the structure,
In order to control the movement of the mass body, the mass body moving means
Control means for giving a command .

[0011]

[Function] A mass body which can be moved according to the vibration of a structure.
And that the mass moves with a locus convex downward
Is combined with a support member that supports
Have a natural frequency equal to the primary natural frequency of the structure
The mass type body is displaced by the mass body moving means controlled by a command outputted from the control means according to the vibration state of the structure, so that the active type suppressing the primary mode vibration of the structure is adjusted. Damping can be performed.

The total mass of the mass body moving means and the mass body and the supporting member is supported by the elastic member with respect to the structure, and is equal to the secondary natural frequency of the structure.
Since it is tuned to have a natural frequency,
A passive type vibration damping for damping the second mode vibration can also be performed.

[0013]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of one embodiment of a vibration damping device according to the present invention, and FIG. 2 is a schematic diagram showing a vibration damping control system of the vibration damping device according to the present invention.

In FIG. 2, the vibration damping device 15 is a rooftop 1 of a building 17.
7a. This building 17 has 12 floors, and is constructed like a tower structure in which the depth of the side is smaller than the width of the front. Building 17, for example 3, 6,
The 9,12 floor of each floor, the vibration state detection sensor 19 for detecting the state of vibration, such as the floor or a pillar (19 _1, 19
₂ , 19 ₃ , 19 ₄ ), and an earthquake sensor 21 for detecting an earthquake is buried under the building 17. An anemometer 23 is installed on the roof of the building 17.

The vibration state detecting sensor 19 is connected to the building 1
A displacement sensor for detecting a displacement when the 7 vibrates, or a speed sensor for detecting a speed when the vibration occurs,
Alternatively, an acceleration sensor or the like for detecting acceleration may be employed.

The building 17 shown in FIG. 2 has a structure in which, for example, when an earthquake occurs or when wind pressure acts, vibration is apt to occur in a narrow direction with a small depth (the direction of arrow X in the figure). Therefore, the vibration damping device 15 shown in FIG. 2 is installed so as to dampen vibration generated in the direction of the arrow X. As shown in FIG. 1, the self-propelled body 25 as a mass body having the additional mass 1 is self-propelled by an AC servomotor 26 as a power unit as mass body moving means. The structure is such that it can reciprocate in the direction of arrow X in the figure.

In FIG. 2, when the building 17 vibrates due to the occurrence of an earthquake, detection signals from the respective vibration state detection sensors 19 _{1 to} 19 ₄ and the earthquake sensor 21 are input to an A / D converter 27 and converted into digital signals. You. A / D converter 2
7, the measurement signal from the anemometer 23 and the rotation detection signal from a rotation detector (not shown) built in the AC servomotor 26 as a power unit are also input to the arithmetic unit 29 to which the signal from 7 is input. And the vibration state detection sensor 19
_{1-19 4,} seismic sensor 21, the vibration by the signal from the wind speed wind gauge 23 like state are calculated, the displacement direction of the additional mass 1, based on the calculation result, the amount of displacement, the displacement speed, the program for calculating the acceleration, etc. Is stored. Then, the servo controller 31 connected to the arithmetic unit 29 supplies a drive current to the AC servomotor 26 according to a command from the arithmetic unit 29. That is, the vibration state detection sensor 19,
Since the sensors such as the earthquake sensor 21 and the anemometer 23, the A / D converter 27, the arithmetic unit 29, the servo controller 31 and the like constitute control means for controlling the AC servomotor 26 as the mass moving means. is there.

Here, the vibration damping device 15 as a main part of the present invention will be described in detail. The self-propelled body 25 as a mass body of the vibration damping device 15 has an additional mass having a predetermined mass corresponding to the mass of the building 17. A mass 1 is provided. Further, it has an AC servomotor 26 as a drive unit for self-propelling, and a pair of wheels 33
Alternatively, two pairs of wheels 33 can be driven. Each wheel is provided with flanges at both peripheral edges thereof, and rides on the rail 35 so that both side surfaces of the rail 35 are sandwiched between the flanges. This prevents the self-propelled body 25 from skidding against vibration in the direction perpendicular to the arrow X direction. It is needless to say that the self-propelled body 25 can be prevented from skidding on the rail 35 by a flange such as a wheel set of a railway vehicle. The wheel 33 and the rail 35 are formed with teeth and mesh with each other. As a result, the rail 35 can withstand large vibrations.
To prevent the self-propelled body 25 from slipping in the longitudinal direction, thereby preventing vibration control from being performed well. Instead of directly engaging the wheels 33 and the rails 35, a drive system (combination of rack rails and drive gears) such as a rack railway may be separately provided. The transmission and reception of signals between the self-propelled body 25 and the servo controller 31 and the supply of current to the AC servomotor 26 as a power unit are performed by a flexible cable 37. The flexible cable 37 is arranged along the rail 35, and can flexibly cope with the movement of the self-propelled body 25 by bending sequentially.

The rail 35 is provided on a concave surface 39 that supports the mass body so as to allow a moving motion that draws a locus convex downward. The support table 41 as a support member having the concave surface 39 is installed on the building 17 via an elastic body 43 as an elastic member made of laminated rubber or the like.
The size of the total mass including the self-propelled body 25 having the additional mass 1, the support table 41, and the like, and the strength of the elastic body 43 are the same as those of the building 1.
7 is set to a value that can effectively suppress vibration. As a result, the self-propelled body 25 performs active vibration suppression by self-propelled, while the elastic body 43 performs passive vibration suppression with almost the total mass of the vibration suppression device as an additional mass.

Here, the operation of the vibration damping device 15 having the above configuration will be described. For example, when the building 17 vibrates in the direction of arrow X due to the occurrence of an earthquake or the action of wind pressure, the building 1
In each floor of 7, different displacement amounts and acceleration vibrations are generated. Such vibrations of the building 17 are detected by the respective vibration state detection sensors 19 _{1 to} 19 ₄ , and further based on signals from the earthquake sensor 21 and the wind anemometer 23, the displacement direction, displacement amount, speed, The acceleration and the like are calculated by the arithmetic unit 29.
Is calculated by The servo controller 31 is driven by an AC servomotor 2
6 is supplied with a drive current.

Since the AC servomotor 26 can be driven as soon as power is supplied, it consumes no power except when necessary and is economical.

When the AC servo motor 26 is driven to rotate,
This driving force is transmitted to the wheels 33, and the teeth of the wheels 33 mesh with the teeth of the rail 35, and the self-propelled body 25 moves on the rail 35. Then, this movement causes a displacement of the additional mass 1.

As described above, the present vibration damping device does not require a rod or a ball screw shaft as in the prior art, and simply employs the rail 35.
, The self-propelled body 25 can be made to self-travel even over a long distance, and the displacement of the additional mass 1 can be increased.

The AC servo motor 26, which is a power unit for self-propelling, is incorporated inside the self-propelled body 25, and is used as a part of the additional mass 1.

Further, when the self-propelled body 25 reciprocates to suppress the vibration of the building 17, the concave surface 39 acts to reduce the bottom of the surface 39 by the component force of the gravity acting on the additional mass 1 along the surface 39. Since the restoring force is applied to return to the power, the power of the power unit can be saved. That is, by adjusting the natural vibration period determined from the concave shape of the surface 39 and the additional mass 1 in accordance with the natural vibration period of the building,
TMD (T which performs passive vibration suppression using self-propelled body 25
uned Mass Damper, adjustment mass damper)
, And active vibration suppression by the power unit (AC servomotor 26) can be performed thereon, and a hybrid vibration damping device that saves the power of the power unit can be easily configured.

That is, in a vibration damping device composed of only the concave surface 39 and the additional mass 1 (when the elastic body 43 is not provided), the natural frequency of the device matches the primary natural frequency of the structure. The adjusted passive type TMD is a vibration damping device for the vibration of the primary mode of the structure, but is provided with an elastic body 43 (see FIGS. 1 and 3).
By adjusting the secondary natural frequency of the device caused by the elastic body 43 so as to match the secondary natural frequency of the structure, both the primary mode and the secondary mode of the structure can be achieved while being passive. This is an effective TMD device for the vibration of.

Further, when the additional mass 1 is provided with an active control force so as to run on its own, a hybrid active vibration damping device effective for both primary mode and secondary mode vibrations of a structure is provided. It is possible to configure.
In this case, as compared with the case where the active vibration damping device as shown in FIGS. 4 and 5 controls both the primary mode and the secondary mode of the structure, the energy required for the active control can be saved. Can be planned.

It is simplest to make the concave section 39 in the above-described embodiment such that the longitudinal section including the center of the bottom is an arc shape, but other curves which can sufficiently exhibit the vibration damping effect can be obtained. May be appropriately formed.

In the above embodiment, the rail 35 has the surface 3
9, but in another embodiment, as shown in FIG. 3, the wheels 3, which are paired up and down with respect to a downwardly curved rail 35 supported above.
The self-propelled body 25 can be brought into a stable state by being in contact with the three. That is, the rail 35 is hollowly supported by the column 45, and two pairs of wheels 33 provided on the left and right sides of the self-propelled body 25 are provided on the upper and lower surfaces of the rail 35, respectively. In contact with each other. This makes it possible to stabilize the self-propelled body 25.
The operation of this embodiment is the same as that of the first embodiment.

[0030]

As described above, according to the vibration damping device of the present invention, the displacement of the mass body can be increased by the self-propelled mass body, and the mass of the mass body moving means provided in the mass body can be reduced. Since it is included in a part of the equipment, the equipment is not unnecessarily increased in size and expensive. Also, when the mass body travels in a self-propelled manner with a downwardly protruding trajectory, the tangential component of the trajectory of the gravitational force acting on the mass body becomes a restoring force on the mass body, so that reciprocation can be easily performed. The power of the power unit, which is the mass moving means, can be saved. Further, both the active vibration suppression performed by the self-propelled movement of the mass body and the passive vibration suppression performed by the elastic member are performed under the condition that the total mass of the mass body and the supporting member supporting the mass body is shared. Since it can be performed by one device, various excellent effects such as an economical vibration damping device can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a vibration damping device according to the present invention.

FIG. 2 is a schematic diagram showing a vibration control system of a building provided with the vibration control device of the present invention.

FIG. 3 is a side view showing another embodiment of the vibration damping device of the present invention.

FIG. 4 is a side view of a conventional active vibration damping device.

FIG. 5 is a side view of a conventional active vibration damping device.

FIG. 6 is a side view of a conventional passive vibration damping device.

[Explanation of symbols]

 1 Additional mass 17 Building (structure) 25 Self-propelled body 41 Support base 43 Elastic body

Claims (1)

(57) [Claims] An object is provided for suppressing vibration of a structure.
A mass body movable in accordance with the vibration of the structure, and supporting the mass body to move with a locus convex downward.
And the mass body is paired with a locus convex downward.
Eigenequal to the primary eigenfrequency of the structure combined
A support member having a frequency ; and a material provided on the mass body for self-propelling the mass body.
The mass member moving means, and the supporting member including the mass body and the mass body moving means.
Having a natural frequency equal to the secondary natural frequency of the structure
And the movement of the mass body according to the vibration state of the structure
Control means for giving a command to the mass body moving means to perform
Damping device, characterized in that it comprises and.