JPH0681515A - Additive vibrator in damping device - Google Patents

Abstract

PURPOSE:To improve the operating capacity of an additive vibrator in a damping device which checks any movement in a building due to an earthquake or the like. CONSTITUTION:A core part 7 of a movable cylinder 2 or permanent magnet in almost E-shaped sectional form is made insertable in a hollow part 4 of a fixed cylinder 1, and an opposing ring edge part 8 is approximated to a coil 6 on a surface of this fixed cylinder 1. The movable cylinder 2 is made slidable on a rail 10. With two brushes 13a and 13b installed in the edge part 8 of the movable cylinder 2, a driving signal current of frequency is properly fed only to a winding part of the coil 6 to be situated in space between these brushes, whereby Lorentz's force along the axial direction of the fixed cylinder 1 is generated there. In addition, vibration due to an earthquake or the like and any movement in a building are properly detected, and a detecting signal and an opposite-phase driving signal current are made to flow therein, thereby making the size and direction of the generating Lorentz's force variable to some extent, and thereby the movable cylinder 2 is reciprocated, controlling the extent of vibrations in the building.

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 suppressing earthquakes, vibrations, or movement of a building caused by vibrations, and more particularly to a vibration damping device having a novel drive structure for a vibration additional member.

[0002]

2. Description of the Related Art With the increase in the height of buildings, a vibration control technology for suppressing the vibration of the building due to an earthquake or a wind has attracted attention. There are various types of such vibration control techniques, and the type that has received the most attention these days is the active type or the automatic control mechanism. This method detects vibrations caused by earthquakes and winds, or movements of buildings caused by earthquakes and vibrations with a sensor, and drives an additional vibrator attached to the top of the building so that it has a phase opposite to that of the movements of the building. It is to suppress movement.

[0003]

Although many proposals have been made so far for an additional vibrating device used in such a system, a driving force of an additional vibrating member has not been developed yet, It is desired to develop a device that is excellent in operating capacity, maintainability, and operating cost.

The present invention has been made in view of such conventional problems.

[0005]

In order to achieve the above-mentioned object, an additional vibration device of a vibration damping device according to the present invention detects an earthquake or vibration, or a movement of a building due to the earthquake or vibration, and detects the vibration on the upper part of the building. In an additional vibration device of a vibration damping device for suppressing the movement of a building by driving the attached additional vibration body in a phase opposite to that of the movement of the building, a fixed cylinder having a hollow portion along an axial direction and an outer surface of the fixed cylinder. A coil that can be energized in the direction perpendicular to the axial direction of the fixed cylinder, a core part that is inserted into the hollow part of the fixed cylinder, and an edge part that is formed in an annular shape so as to be close to the outer surface of the coil. And a movable cylinder portion made of a permanent magnet that movably supports the support cylinder along the axial direction of the fixed cylinder and generates a magnetic field in a direction perpendicular to the axial direction of the fixed cylinder, and an edge portion of the movable cylinder portion. Project in opposite directions in the axial direction of the fixed cylinder As described above, the movable cylinder portion is fixed to the fixed cylinder by supplying electric power to the coil winding portion located between the pair of electric conductors, and the electric conductors are attached to one side and the other side is grounded. It has a structure that can be driven in the axial direction of the section.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an embodiment of an additional vibration device according to the present invention, FIG. 2 is a horizontal enlarged cross-sectional view of the device of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a conducting portion.

To explain the overall structure, in the figure, 1 is a fixed cylinder, 2 is a movable cylinder which is an additional vibrating body, and the fixed cylinder 1 is movable by fixing one end to a pedestal 3 which is fixedly grounded on the roof of a building. The cylinder 2 is supported by a support shaft 5 penetrating through the hollow portion 4 of the fixed cylinder 1 so as to be slidable in the left-right direction in FIG.

A coil 6 is wound around the outer surface of the fixed barrel 1 so that when energized, a current flows in a direction perpendicular to the axial direction of the fixed barrel 1 (perpendicular to the plane of FIG. 2).

The movable barrel 2 is made of a permanent magnet having a substantially E-shaped cross section (inverted E-shape in FIG. 2), and has a core portion 7 of a size that can be inserted into and removed from the hollow portion 4 of the fixed barrel 1. And an edge portion 8 which is annular and is brought close to the outer surface of the coil 6. The core portion 7 has a hollow shaft shape, and the support shaft 5 described above penetrates the inside thereof. In the illustrated example, the core 7 is the N pole and the edge 8 is the S pole.
A magnetic field is generated as a pole in a direction perpendicular to the axial direction of the fixed cylinder 1 (vertical direction in FIG. 2). Of course, the core 7 and the edge 8
Is not necessarily the polarity of this example. A pair of support sliders 9 are provided below the fixed barrel 1, and the movable barrel 2 can be slid by placing these support sliders 9 on rails 10 laid on the frame 3.

Reference numeral 11 in the drawing denotes an electric conductor, and a pair of energizing terminal portions 12 are attached to the edge portion 8 of the movable cylinder 2 so as to project to the opposite side in the axial direction of the fixed cylinder 1, and brushes 13a and 13 are respectively attached.
b is fixed. These brushes 13a, 13b are
A drive signal current having an appropriate frequency is supplied to the brush 13a on one side from a power source (not shown), and the brush 13b on the other side is grounded. That is, in the coil 6, the current flows only in the portion located between the brushes 13a and 13b.
With this type of device, the power remains on all day,
With such a configuration, power consumption can be reduced.
The coil 6 is preferably a rectangular wire considering the sliding contact with the brushes 13a and 13b. Alternatively, the coil 6 may be in contact with a plurality of windings at the same time.

Next, the operation of this embodiment will be described. The device is assembled to the configuration described above, and the terminal portion 1 of the electric conductor 11 is assembled.
2 is supplied with an appropriate drive signal current. Then coil 6
A current flowing through the movable cylinder 2 and a magnetic field generated between the core portion 7 and the edge portion 8 of the movable cylinder 2 generate a Lorentz force along the axial direction of the fixed cylinder 1 according to Fleming's left-hand rule.

As is well known, the Lorentz force F is

F = J · B · l · b · d (N) [where J is current density (A / m2), B is magnetic flux density (T), l is electrode length (m), and b is electrode width. (M) and d are expressed as an inter-electrode distance (m)], and in the apparatus of this embodiment, only J is variable. That is, the magnitude and direction of the Lorentz force F generated by the change in the drive signal current supplied to the coil 6 is changed, and the movable cylinder 2 reciprocates on the rail 10 accordingly. Therefore, vibrations caused by earthquakes and wind,
The movement of the building due to an earthquake or vibration is detected by an appropriate detection device, and a drive signal current having a phase opposite to the detection signal is detected by the coil 6
If it is flown into the cylinder, the movable cylinder 2 moves in a phase opposite to the vibration, and the vibration of the building is controlled.

In the above description, the earthquake and vibration detecting device, the analyzing device, the signal converting device, etc. are omitted, but those conventionally used in this type of device may be adopted. Further, the device of the present invention may employ a device, member, or element based on superconductivity, and is not limited to a normal conductive device.

[0014]

Since the additional vibration device of the vibration damping device according to the present invention is as described above, the driving state of the additional vibration member can be easily changed by controlling the drive signal current applied to the coil, and maintenance management can be performed. And the operating cost is excellent.

[Brief description of drawings]

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

2 is a horizontal enlarged cross-sectional view of the device of FIG.

FIG. 3 is an enlarged cross-sectional view of an energized portion of the device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed cylinder 2 Movable cylinder 3 Stand 4 Hollow part 5 Support shaft 6 Coil 7 Core part 8 Edge part 9 Support slider 10 Rail 11 Current carrying body 12 Terminal part for energization 13a, 13b Brush

Claims (1)

[Claims] 1. A movement of a building is detected by detecting an earthquake or a vibration or a movement of the building due to the earthquake or a vibration and driving an additional vibrating body mounted on the upper part of the building so as to have a phase opposite to the movement of the building. In an additional vibration device for a vibration damping device, a fixed cylinder having a hollow portion along the axial direction, a coil wound around the outer surface of the fixed cylinder and capable of conducting electricity in a direction perpendicular to the axial direction of the fixed cylinder, and the fixed cylinder. Of the core, and an edge formed in an annular shape so as to be close to the outer surface of the coil. The core is supported movably along the axial direction of the fixed cylinder on the support frame, and A pair of movable cylinders made of permanent magnets that generate a magnetic field in the direction perpendicular to the axial direction, and a pair of them are attached to the edge of the movable cylinder so as to project in opposite directions in the axial direction of the fixed cylinder, and power is supplied to one side. And the other side consists of a grounded conductor, An additional vibration device for a vibration damping device, characterized in that power is supplied to a coil winding portion located between a pair of current-carrying members so that the movable tubular portion can be driven in the axial direction of the fixed tubular portion.