JPH02248583A - Vibration insulator device - Google Patents

Abstract

PURPOSE:To effectively damp various types of vibration by a method in which the vibrating direction of a pendulum and the distance from a fulcrum to a weight are made variable in a vibration insulator device using the pendulum and the vibrating direction of a structure is harmonized with the vibrating period. CONSTITUTION:In a vibration insulator device using a pendulum 26, a varying mechanism for the vibrating directions of the pendulum is provided to match the vibrating direction of the pendulum 26 even in any direction to the lateral vibrating direction of a structure. Also, a weight position adjusting mechanism is provided to vary the distance from the fulcrum of the pendulum to the weight 29 according to the vibrating periods of the structure for matching the period of the pendulum 26 with the vibrating period of the structure. The vibration insulator device can thus be effectively effectuated for various vibrations with different vibrating directions and different vibrating periods.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a vibration damping device capable of attenuating any vibrations in the horizontal vibration direction of a structure due to earthquake loads, wind loads, etc.

"Prior Art" A vibration damping device is a device that reduces the vibration of the vibrating system by attaching or adding another system that is likely to resonate to the vibrating system, thereby causing the vibrating system and another system that is likely to resonate to resonate. It is.

For example, the -next vibration period of a tower (vibrating system),
Match the natural vibration period of the vibration suppressor (the vibrating system and another system that is likely to resonate). Then, the damper is vibrated at a vibration period close to its own natural vibration period, resulting in vibrations many times that of the tower. Thereby, the vibration energy of the tower is absorbed as vibration energy of the damper, and as a result, the vibration or shaking of the tower is damped.

Conventionally, vibration in any of the directions of lateral vibration of a structure due to earthquake loads, wind loads, etc.

As an example of a vibration damping device that can also damp vibrations, one described in Japanese Patent Application Laid-open No. 102041/1984 is known. As shown in Figures 6 to 8, this device is a structure in which a pendulum-type seismic isolation device is installed on a structure 1, which is composed of a pendulum 21, a heavy bridge, and a pedestal 4, and the pendulum 2 is a structure made of a spherical bearing. The fulcrum 51 is supported by a pedestal fulcrum 6 made of a spherical bearing.

Therefore, according to this device, X in FIGS. 6 and 7
direction, the X direction perpendicular to the X direction, the p direction roughly forming an arbitrary angle α with the The relative displacement between the structure 1 and the frame 4 caused by the earthquake load or wind load causes an expanded movement of the heavy support 3, and the inertial force acts as resistance against the earthquake load or wind load, so the structure It is designed to reduce vibrations and shaking of objects.

The above-mentioned Japanese Patent Application Laid-Open No. 54-102041 gives an example in which this vibration damping device is applied to a spherical tank shown in FIG.

"Problem to be Solved by the Invention" By the way, in general, the period of vibration or shaking of a structure due to earthquake load, wind load, etc. (hereinafter referred to as vibration period) is determined by the input direction of the earthquake load, the input direction of the wind load, and the cross section of the structure. It differs depending on the relative relationship with the shape. For example, in a structure such as a building with a rectangular cross-sectional shape, if an earthquake load or wind load is input in the long side direction of the building,
The vibration period of the structure is different when an earthquake load or wind load is applied manually in the short side direction of the building. Therefore, in this building, the earthquake load or wind load can be efficiently handled (
In order to dampen the vibration, the -next vibration period of the building (structure) must match the natural vibration period of the damping device, so damping must be done in response to the difference in the earthquake load input direction and wind load input direction. The natural vibration period of the vibration device must be changed.

However, in the conventional vibration damping device, since the distance from the structure fulcrum 5 to the heavy joist 3 and the distance from the pedestal fulcrum 6 to the joist 3 are constant, differences in the earthquake load input direction and the wind load human force direction Correspondingly, the natural vibration period of the damping device cannot be changed. Therefore, depending on the input direction of seismic load or wind load, the conventional vibration damping device may not have a damping effect on structures other than those whose cross-sectional shape is circular or very close to circular. There are times when you can't even do it. That is, there is a problem in that a vibration damping effect may not be obtained in a certain direction of earthquake load input or wind load input direction.

As shown in Figure 8, when the structure is a spherical tank, the natural vibration period of the vibration damping device is almost constant in any vibration direction among the vibration directions of the lateral vibration, so the natural vibration period of the damping device is This is a special case where there is no need to change.

The present invention has been made in view of the above-mentioned circumstances, and is capable of effectively damping vibrations or shaking in any one of the directions of lateral vibration of structures having different cross-sectional shapes. The purpose is to provide a vibration damping device that can

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. That is, in a vibration damping device using a pendulum, the pendulum swing direction is arbitrarily changed so that the swing direction of the pendulum matches any of the vibration directions of the transverse vibration of the structure. A change mechanism is provided, and a weight position adjustment mechanism is provided for adjusting the distance from the fulcrum of the pendulum to the weight of the pendulum in order to synchronize with the vibration period of the structure.

"Function" The action of the pendulum swing direction changing mechanism makes it possible to align the pendulum swing direction in the same direction as the earthquake load input direction or wind load input direction of the structure, and the heavy peg position adjustment mechanism allows the cross-sectional shape to be circular. It is possible to almost match the primary natural vibration period of structures with various cross-sectional shapes such as triangles and rectangles outside of circles and the natural vibration period of the pendulum of the damping device, as well as structures of This effectively damps vibrations or swings in any one of the vibration directions of the lateral vibrations of the various types of structures.

"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4. Reference numeral 11 in FIG.
A support column 14 of a pendulum suspension 13 is rotatably supported via the pendulum suspension 13. The pendulum suspension 13 consists of a support 14 that passes through the upper plate 15 of the base 11 and a pendulum suspension arm 16 that is integrally provided on the top of the support 14 and extends horizontally, and is formed in an inverted shape as a whole. It is.

Reference numeral 17 denotes a flange-shaped stopper that is integrally provided on the support column 14.

On the other hand, an actuator (motor) 1 is installed at the bottom of the base 11.
8 is attached to the motor 18, and a small gear 19 is attached to the rotating shaft directed upward of the motor 18. A large gear 20 is fixedly attached to the lower end of the column 13, and this large gear 20 is meshed with a small gear 19.

A bracket 2 is attached to the pendulum suspension arm 16 integrally and in a downwardly extending manner.
1.22.23 are provided, and these brackets 2
1.22.23, a pendulum 26 having a shaft 25 integrally provided on the upper part of the pendulum arm 24 is rotatably suspended. The shaft 25 is rotatably supported by brackets 21, 22, 23 via bearings 27°27.

Further, a damper 28 is fixedly attached to the shaft 25 so as to be positioned between the brackets 22 and 23.

A heavy bell 29 is attached to a slide bearing 30 at the bottom of the pendulum 26.
They are fitted and attached so that they can move up and down.

Further, a bracket 31 is provided at the intermediate portion of the pendulum arm 24 at right angles to the pendulum arm 24, and a cylinder mechanism 32 is attached to this bracket 31 in a hanging manner. The tip (lower end) of the cylinder mechanism 32 is rotatably attached to the upper surface of the bell 29. 33 is a stopper provided at the lower end of the pendulum arm 24, and 33 is shown in FIGS. 2 to 4.
4 is a structure (for example, a building). Motor 18. 19 small floats, 20 large gears. Pendulum hanging 13. The pendulum 26 constitutes a pendulum swing direction changing mechanism.

Note that when using the above vibration damping device, an acceleration sensor (acceleration converter) (not shown) is attached to the structure, and its output is used.

Some of these acceleration converters, for example, use strain gauges to convert acceleration and vibration into minute voltages to measure accuracy. When acceleration is applied, this acceleration is transmitted to the weight and the spring is deformed, so the strain gauge attached to the spring is designed to obtain an electrical output (microvoltage) proportional to the acceleration, and this microvoltage is If amplified, acceleration/vibration can be measured.Acceleration converters can simultaneously detect acceleration/vibration in the front-rear, left-right, or front-rear, left-right, and up-down directions. The rotation of the motor 18 is controlled based on the output of the structure 34. Arrows A and B shown in FIGS. 3 and 4 indicate the direction of vibration or shaking acting on the structure 34.

Next, the operation of the vibration damping device configured as described above will be explained.

First, a vibration damping device is installed at the top of the structure 34, and the acceleration sensor (acceleration converter) is installed.

When an earthquake load or wind load acts on the structure 34 and the acceleration sensor detects the input direction and vibration period of the earthquake load or wind load, the rotation angle motor 1 is activated according to the detection signal.
8 rotates, and the small gear 19. Support 14 via large gear 20
is rotated at a reduced speed to match the vibration or swing direction of the structure 34 with the swing direction of the pendulum 26. At this point, the cylinder mechanism 32 is expanded or contracted in response to the detection signal of the acceleration sensor, so that the primary vibration period of the structure 34 and the vibration period of the pendulum 26 are matched.

Furthermore, when the pendulum arm 24 of the pendulum 26 swings due to earthquake load or wind load, the shaft 25 also rotates back and forth together with the pendulum arm 24, and the damper 28 fixedly attached to the shaft 25 also rotates together with the shaft 25. Due to the buffering effect of 28,
A damping force is applied to the pendulum 26 as appropriate. Note that FIG. 4 shows a state in which the pendulum hanger 13 is rotated due to vibration acting on the structure 34 or a change in the swing direction.

As described above, the pendulum suspension 13 can be rotated based on the detection signal of the acceleration sensor, and the swinging direction of the pendulum arm 24 can be aligned in the same direction as the earthquake load input direction or wind load input direction of the structure 34, By adjusting the position of the heavy stud 29, it is possible to adjust the primary natural vibration period of not only structures with a circular cross-sectional shape, but also structures with various cross-sectional shapes such as triangular and rectangular shapes outside of a circle, and vibration damping devices. It is possible to make the natural vibration period of the pendulum 26 substantially coincide with the natural vibration period of the pendulum 26, and as a result, the vibration damping device of the base can suppress vibration or shaking in any one of the vibration directions of the lateral vibration of the various types of structures 34. can also be effectively attenuated.

However, when damping a structure with a circular cross section, such as a columnar structure, it is not necessary to adjust the movement of the heavy peg 29 in response to changes in vibration or shaking direction.

In the above embodiment, the cylinder mechanism 32 provided at the intermediate portion of the pendulum arm 24 moves the heavy peg 29 up and down; however, the structure is not limited to this (for example, it may be configured as shown in FIG. 5). In other words, a trapezoidal screw 42 may be provided at the lower part of the pendulum arm 41, and a mounting arm 44 may be provided at the pendulum arm 41 so as to be located below the shaft 43 provided on the pendulum arm 41. A motor 45 is attached with the rotating shaft hanging down. Also, a gear 46 attached to the rotating shaft of the motor 45 and a gear 47 attached to the pendulum arm 41 are engaged.

On the other hand, the heavy stud 48 is screwed onto the trapezoidal screw 42 of the pendulum arm 41, and the shaft 50 attached to the mounting arm 44 so as to extend downward is inserted into the through hole 49 provided near the outer periphery of the heavy stud 48. The heavy peg 48 may be prevented from rotating, the motor 45 is operated, and the pendulum arm 41 is rotated via the gears 46 and 47 to move the peg 48 up and down.

Further, in the first embodiment, the motor 18 rotates the column 14 to match the vibration or swing direction of the structure 34 with the swing direction of the pendulum arm 24. However, the present invention is not limited to this. The support 14 can also be rotated by using the mechanism as a drive range and combining it with a rank and pinion, or by using a crank mechanism.

"Effects of the Invention" According to the present invention, in a vibration damping device using a pendulum, the pendulum swings so that the swing direction of the pendulum coincides with any of the vibration directions of the transverse vibration of the structure. Since a pendulum swing direction changing mechanism is provided to arbitrarily change the direction, it is possible to match the pendulum swing direction to the same direction as the earthquake load input direction or wind load direction of the structure, and also to match the vibration period of the structure. In order to synchronize the pendulum, a weight position adjustment mechanism is provided to adjust the distance from the fulcrum of the pendulum to the weight of the pendulum, so it can be used not only for structures with a circular cross section, but also for structures outside the circle, such as triangles, rectangles, etc. It is possible to almost match the primary natural vibration period of structures with various cross-sectional shapes and the natural vibration period of the pendulum of the damping device, and as a result, among the vibration directions of the lateral vibrations of these many types of structures, Vibration or shaking in any vibration direction can be effectively damped.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a schematic longitudinal sectional view, Figure 2 is a perspective view showing the vibration damping device installed at the top of the structure, and Figure 3 is a plan view showing the vibration damping device installed at the top of the structure. , Figure 4 is a plan view similar to Figure 3 showing the state in which the pendulum suspension is rotated, Figure 5
The figure is a vertical sectional view of the main part showing another embodiment of the present invention, and FIGS. 6 and 7 show an example of a conventional vibration damping device.
The figures are diagrams for explaining the vibration damping principle, FIG. 7 is a sectional view showing a pendulum section, and FIG. 8 is a diagram showing an example in which a conventional vibration damping device is applied to a spherical tank. 13...pendulum hanging, 14...post, 1
6... Pendulum suspension arm, 18... Actuator (motor), 24.41... Pendulum arm, 26
...Pendulum, 28 ...Damper 29,4
8... Heavy hammer, 32... Cylinder mechanism, 3
4... Structure.

Claims (1)

[Claims] In a vibration damping device using a pendulum, a pendulum swing direction changing mechanism that arbitrarily changes the swing direction of the pendulum so that the swing direction of the pendulum matches any of the vibration directions of transverse vibration of a structure. 1. A vibration damping device comprising: a vibration damping device; and a heavy peg position adjustment mechanism for adjusting a distance from a fulcrum of the pendulum to a heavy peg of the pendulum so as to synchronize with the vibration period of the structure.