JPH0518142A - Damping device - Google Patents

Abstract

PURPOSE:To save the power of the power section of an active damping device displacing an additional mass for damping in response to the vibration state of a structure and allow it to concurrently serve as a passive damping device. CONSTITUTION:A self-advancing body 25 with an additional mass 1 advances on a circular arc-shaped support base 41, and the circular arc-shaped support base 41 is provided on a structure 17 via an elastic body 43. The displacement of the self-advancing body 25 for suppressing the primary-mode vibration of the structure 17 is controlled when the drive current of an AC servo-motor 26 driving the wheels 33 of the self-advancing body 25 is adjusted in response to the vibration state of a building. The secondary-mode vibration of the structure 17 is suppressed by the elastic body 43 supporting the total mass of the support base 41 including the self-advancing body 25.

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 the vibration of the structure by 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, a vibration damping device for damping the vibration when a vibration occurs due to an earthquake or wind pressure is provided on the roof of the building. Has been. This type of vibration damping device employs a structure in which an additional mass having a predetermined weight mainly depending on the mass of a building is displaced according to a vibration state.

For example, as shown in FIG. 4, there is a structure in which an additional mass 1 can be moved by a roller 3 or the like and can be displaced by an actuator 7 via a rod 5. Japanese Patent Application Laid-Open No. 2-13667 exists as a publication describing this kind of technique.

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 in the additional mass 1, and the ball screw shaft 9 is rotated by a servomotor 13 to add the additional mass 1. There are some that allow 1 to be displaced. Japanese Patent Application Laid-Open No. 2-340078 discloses a technique of this type.

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

[0006]

However, in order to obtain a large displacement amount of the additional mass 1, the rod 5 (FIG. 4) is used.
Alternatively, the ball screw shaft 9 (FIG. 5) must be lengthened, and if it is lengthened, there is a possibility that the rod 5 or the ball screw shaft 9 will buckle, or the shaft rigidity will decrease and the natural frequency of the device system will decrease. Therefore, the vibration suppression control is adversely affected. Therefore, there is a limit in increasing the amount of displacement of the additional mass 1. Further, the power parts such as the actuator 7 and the servo motor 13 do not serve as an additional mass for damping, but become 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 apparatus becomes large and the equipment cost becomes high. ..

Further, in order to perform the active type vibration suppression and the passive type vibration suppression, it is necessary to provide separate devices, and two additional masses must be provided, which is uneconomical.

The present invention has been made in view of the above circumstances. The displacement of the additional mass can be increased, the weight of the power unit can be used as a part of the additional mass, and the power of the power unit can be saved. 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]

The present invention has been made in order to achieve the above-mentioned object, and a mass body movable according to a vibration state of a structure and a locus convex downward to the mass body. A support member for supporting the moving motion of drawing the
An elastic member that supports the support member, a mass body moving unit that is provided on the mass body and that allows the mass body to self-propagate, and the moving body body that detects the vibration state of a structure to control the moving movement of the mass body. It has a control means which controls a mass body moving means, It is characterized by the above-mentioned.

[0011]

The mass body, which is supported by the support member and moves in a downward convex locus, is controlled by the control means according to the vibration state of the structure on which the support member is installed. Since it is displaced, it is possible to perform active type vibration suppression that suppresses the vibration of the primary mode of the structure.

The total mass of the mass body including the mass body moving means and the supporting member is supported by the elastic member with respect to the structure, and is adjusted so as to suppress the vibration of the secondary mode of the structure. Therefore, passive vibration control can also be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of an 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 the roof 1 of the building 17.
It is installed at 7a. This building 17 is a 12-story building and is constructed like a tower structure in which the depth of the side surface is smaller than the width of the front surface. 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 and 19 ₄ ) are provided, and an earthquake sensor 21 for detecting an earthquake is buried underground in the building 17. An anemometer 23 is installed on the roof of the building 17.

The vibration state detection sensor 19 is used for the building 1
A displacement sensor that detects displacement when 7 vibrates, or a speed sensor that detects speed when vibration occurs,
Alternatively, an acceleration sensor or the like that detects acceleration may be adopted.

The building 17 shown in FIG. 2 has a structure in which vibration is likely to occur in a narrow width direction (arrow X direction in the drawing) having a small depth when, for example, an earthquake occurs or wind pressure acts. Therefore, the vibration damping device 15 shown in FIG. 2 is installed so as to damp the vibration generated in the arrow X direction. As shown in FIG. 1, in the vibration damping device 15, a self-propelled body 25 as a mass body having an additional mass 1 is self-propelled by an AC servomotor 26 which is a power unit as a 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, the detection signals from the vibration state detection sensors 19 _{1 to} 19 ₄ and the earthquake sensor 21 are input to the A / D converter 27 and converted into digital signals. It A / D converter 2
To the arithmetic unit 29 to which the signal from 7 is input, 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 the power unit are also input. And vibration state detection sensor 19
_{1 to} 19 ₄ , the vibration state is calculated by the signals from the seismic sensor 21, the wind speed anemometer 23, etc., and a program for calculating the displacement direction, displacement amount, displacement velocity, acceleration, etc. of the additional mass 1 is calculated based on the calculation result. It is stored. Then, the servo controller 31 connected to the arithmetic unit 29 supplies a drive current to the AC servo motor 26 according to a command from the arithmetic unit 29. That is, the vibration state detection sensor 19,
Since the seismic sensor 21, the sensors such as the anemometer 23, the A / D converter 27, the arithmetic unit 29, the servo controller 31 and the like constitute a control means for controlling the AC servo motor 26 which is the mass moving means. is there.

The vibration damping device 15 which is the main part of the present invention will be described in detail. The self-propelled body 25 as the 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 of 1 is provided. Further, the AC servo motor 26 is provided as a drive unit for self-propelled, and a pair of wheels 33
Alternatively, two pairs of wheels 33 can be driven. Each wheel is provided with flanges at both peripheral edge portions thereof, and is adapted to ride on the rail 35 and sandwich both side surfaces of the rail 35 with the flanges. As a result, the self-propelled body 13 is prevented from sliding sideways with respect to the vibration in the direction perpendicular to the arrow X direction. It should be noted that it is of course possible to prevent the self-propelled body 25 from slipping on the rail 35 by a flange such as a wheel axle of a railway vehicle. Further, teeth are formed on the wheel 33 and the rail 35 and mesh with each other. As a result, the rail 35
It is prevented that the self-propelled body 25 slips in the longitudinal direction of and the vibration damping control is not properly performed. Instead of directly meshing the wheels 33 and the rails 35 in this way, a drive system (combination of rack rails and drive gears) such as a rack railway may be provided separately. A flexible cable 37 is used to exchange signals between the self-propelled body 25 and the servo controller 31 and to supply an electric current to the AC servo motor 26 which is a power unit. The flexible cable 37 is arranged along the rail 35 and is adapted to be capable of responding to the movement of the self-propelled body 25 by being sequentially bent.

The rail 35 is provided on a concave surface 39 that supports the mass body so as to allow the mass body to move in a downward convex locus. A support base 41 as a support member having the concave surface 39 is installed in 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 and the support base 41, and the strength of the elastic body 43 are
7 is set to a value that can effectively suppress the vibration. As a result, the self-propelled body 25 self-propels and performs active-type vibration damping, whereas the elastic body 43 performs passive-type vibration damping with the total mass of almost the entire vibration damping device as an additional mass.

The operation of the vibration damping device 15 having the above-mentioned structure will now be described. For example, when the building 17 vibrates in the direction of arrow X due to an earthquake or wind pressure,
Vibrations of different displacements and accelerations occur on each floor of No. 7. Such vibrations of the building 17 are detected by the respective vibration state detection sensors 19 _{1 to} 19 ₄ and further based on the signals from the seismic sensor 21 and the wind speed anemometer 23, the displacement direction, displacement amount, speed, Acceleration, etc.
Is calculated by The servo controller 31 receives a command from the arithmetic unit 29 to drive the AC servo motor 2 which is a power unit.
A drive current is supplied to 6.

Since the AC servo motor 26 can be driven immediately after supplying electric power, it consumes no electric 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, the teeth of the wheels 33 mesh with the teeth of the rails 35, and the self-propelled body 25 moves on the rails 35. Then, this movement causes displacement of the additional mass 1.

As described above, this vibration damping device does not require a rod or a ball screw shaft as in the conventional case, but simply uses the rail 35.
The self-propelled body 25 can be self-propelled even if the distance is long and the displacement amount of the additional mass 1 can be made large.

Since the AC servomotor 26, which is a power unit for self-propelling, is incorporated inside the self-propelled body 25, it 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 cause the component force along the surface 39 of gravity acting on the additional mass 1 to cause the bottom portion of the surface 39. Since the restoring force that tries to return to the power source works, the power of the power unit can be saved. That is, by adjusting the natural vibration period determined by the concave shape of the surface 39 and the additional mass 1 in a form that matches the natural vibration period of the building,
TMD (T which performs passive type vibration control using self-propelled body 25
uned Mass Damper, adjusted mass damper)
In addition, active vibration damping can be performed by the power unit (AC servomotor 26) on the above structure, and a hybrid vibration damping device that saves the power of the power unit can be easily configured.

That is, in the vibration damping device (when the elastic body 43 is not provided) composed only of the concave surface 39 and the additional mass 1, the natural frequency of the device is adjusted to the primary natural frequency of the structure. The adjusted passive TMD serves as a vibration damping device for the vibration of the first-order mode of the structure, and the vibration damping device configured by providing the elastic body 43 (see FIGS. 1 and 3).
Is a passive type by adjusting the secondary natural frequency of the device generated by the elastic body 43 to match the secondary natural frequency of the structure. It becomes an effective TMD device against the vibration of.

Furthermore, when an active control force is applied to the additional mass 1 so that the structure is self-propelled, a hybrid type active vibration damping device effective for both primary mode and secondary mode vibrations of the structure is obtained. It is possible to configure.
In this case, energy saving required for active control is saved as compared with the case where the vibrations of both the primary mode and the secondary mode of the structure are damped by the active vibration damping device as shown in FIGS. 4 and 5. Can be planned.

It should be noted that the concave surface 39 in the above embodiment is the easiest to make the vertical cross section including the center of the bottom portion into an arc shape, but other curves that can sufficiently exhibit the vibration damping effect. You may form suitably in a shape.

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 rail 35 which is supported upward and is curved downward.
It is possible to make the self-propelled body 25 in a stable state by contacting the self-propelled bodies 3 so as to sandwich them. That is, the rails 35 are hollowly supported by the pillars 45, and two wheels 33 provided on each of the left and right sides of the self-propelled body 25 are provided on the upper and lower surfaces of the rail 35 with respect to the two rails 35 arranged side by side. Are touching so as to sandwich. By doing so, it becomes possible to make the self-propelled body 25 self-propelled.
The operation of this embodiment is the same as that described in 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 movement of the mass body, and the mass of the mass body moving means included in the mass body is also the mass body. Since it is included as a part of, the equipment will not be unnecessarily large and expensive. Also, when the mass body draws a downward convex locus and self-propels, the tangential component of the above-mentioned locus of gravity acting on the mass body becomes a restoring force to the mass body, and reciprocation can be easily performed. It is possible to save the power of the power unit that is the means for moving the mass body. Furthermore, both the active type vibration suppression performed by the self-propelled mass body and the passive type vibration suppression performed by the elastic member share the total mass of the mass body and the supporting member supporting the same. Since it can be performed by one device, various excellent effects such as an economical vibration damping device can be provided.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing a damping control system of a building equipped with the damping 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 stand 43 Elastic body

Claims (1)

Claim: What is claimed is: 1. A mass body that is movable according to a vibration state of a structure, and a support member that supports the mass body so as to allow a moving motion that draws a locus convex downward. An elastic member that supports the support member; a mass body moving means that is provided on the mass body and that allows the mass body to self-propagate; and to detect the vibration state of a structure to control the movement movement of the mass body. And a control unit that controls the mass moving unit.