JPH08121531A - Swing preventive device - Google Patents

Abstract

PURPOSE: To provide a swing preventive device by which a natural period can be easily adjusted and optimal damping can be easily adjusted. CONSTITUTION: A base frame 2 is arranged on a structure 1. A pair of guide rails 3 whose central part is curved so as to swell downward are fixed in parallel on the base frame 2. A weight 5 is movably placed on both guide rails 3 through wheels 6. Magnets 8 are installed on either one side between an under surface of the weight 5 and the base frame 2, and an attracting plate 7 is installed on the other side. An adjustment of a natural period is selected by curvature of the guide rails 3. A damping factor is adjusted by electromagnetic force of the magnets 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-sway device which is attached to any structure, such as a building, a bridge, a ship, a gondola, etc., for land use and marine use, and is used for suppressing the shake of these structures. .

[0002]

2. Description of the Related Art Conventionally, as an apparatus for preventing shaking of a structure of this type, as shown schematically in FIG. 8, a rail is provided on a structure for preventing shaking, such as a building, along a shaking direction of the structure a. While laying b, a weight c as a damping body is movably mounted on the rail b via wheels d, and is erected on one side of the weight c and the weight c. Between the bracket e and
A spring f for adjusting the natural period of the weight c to the natural period of the structure a and a hydraulic damping device h for preventing the weight c from excessively shaking due to the swing of the structure a are interposed. The structure a, and the swing of the structure a is repeated by repeatedly moving the weight c.
It is known that it is attenuated by.

[0003]

However, in the case of the above-described conventional anti-sway device, the weight c is added to the natural period of the structure a.
Spring f as a mechanical part to match the natural period of
Since it is difficult to adjust the natural period because it uses, it is not possible to cope with the case where the moving stroke of the weight c is large, and therefore it is not suitable for a large stroke, and the damping Since the device h has a constant damping force and cannot be variably adjusted, it may not be possible to provide optimum damping.
Furthermore, maintenance is difficult.

Therefore, the present invention is intended to provide an anti-sway device in which the natural period can be easily adjusted, a large stroke can be easily realized, and the optimum damping can be easily adjusted.

[0005]

In order to solve the above-mentioned problems, the present invention provides a base frame on a structure to be shake-prevented, and the base frame is curved so that its central portion bulges downward. Guide rails are arranged in parallel and fixedly supported, and a damping body is movably mounted on both guide rails via wheels at both ends. One of the electromagnetic force holding member and the suction plate is attached to the lower surface of the damping body, and the other is attached to the upper surface of the base frame so that damping force is applied to the damping body.

Further, instead of the electromagnetic force attenuator consisting of the electromagnetic force holding member and the suction plate, the wheels of the vibration damping member are made to hold the electromagnetic force, and the function of the suction plate for the electromagnetic force is also given to the guide rail. May be

Furthermore, instead of the electromagnetic force attenuator, a vibration damper is used.
An air resistance plate is attached so as to project in a direction orthogonal to the moving direction of the vibration damper.

Furthermore, instead of the air resistance plate, a propeller may be provided.

On the other hand, instead of movably mounting the vibration damper on the pair of guide rails via the wheels at both ends, the guide rails are monorails, and a plurality of appropriately arranged rails are arranged on the monorails. It is also possible to adopt a configuration in which the vibration damping body is movably mounted via wheels.

[0010]

When the structure shakes, the guide rail is swung integrally with the structure, and the swing energy is converted into the kinetic energy of the vibration suppressor, so that the structure is restrained from swinging. At this time, by properly selecting the curvature of the guide rail, the natural period of the vibration damper is matched with the natural period of the structure, and furthermore, the electromagnetic force attenuator suppresses excessive vibration of the vibration damper.

Further, if the wheels of the vibration damper have electromagnetic force and the guide rails are suction plates, the structure can be further simplified.

On the other hand, when an air resistance plate is projected on the vibration suppressor instead of using the electromagnetic force damper, the excessive vibration of the vibration suppressor is suppressed by the air resistance force.

Further, if a propeller is used instead of the air resistance plate, the propeller can suppress excessive vibration of the vibration damping body.

On the other hand, if the guide rail is of the monorail type, the entire apparatus can be made compact.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

1A and 1B show an embodiment of the present invention, in which a base frame 2 is installed on the top of an anti-sway target structure 1 such as a building, and a required structure is provided on the base frame 2. A pair of front and rear arc-shaped guide rails 3 that are curved with a curvature of 1 are arranged parallel to each other via a support base 4 in a direction in which the structure 1 is shaken in such an arrangement that its center of curvature is located above. A weight 5 as a vibration damping member is fixed between the front and rear guide rails 3 so as to be movable along the longitudinal direction of the guide rails 3 via wheels 6 rolling on the guide rails 3. The suction plate 7 is placed on the base plate 3 and is curved between the guide rails 3 according to the curvature of the guide rails 3, and the suction plate 7 is fixed to the base frame 2. The position where the plate 7 is sandwiched from the front and back while maintaining the required gap. To place the magnet 8 as magnetic force held member, attached to the lower surface of the governor weight 5 both said magnets 8, respectively, via the mounting member 9, the magnet 8
The suction plate 7 and the suction plate 7 constitute an electromagnetic force attenuator I. Further, the outer side surface and the upper portion and the end surface portion of the front and rear guide rails 3 are respectively covered with a cover 10, and the upper portions of the front and rear covers 10 are connected. Structure 1 connected by members 11
When the swaying occurs, the weight 5 is a passive-type sway stop device in which the weight 5 is repeatedly moved along the guide rail 3 in the longitudinal direction.

As the magnet 8, a so-called permanent magnet or an electromagnet is arbitrarily selected and used.

When the structure 1 shakes, the guide rail 3 and the support base 4 are connected to the structure 1 via the base frame 2.
And can be rocked together. Therefore, the guide rail 3
Is applied to the weight 5, and the weight 5 is oscillated by a single string with a natural period that is naturally synchronized with the structure 1. That is, the weight 5 is repeatedly moved along the longitudinal direction of the guide rail 3 through the rolling of the wheels 6, whereby the swing of the structure 1 is quickly attenuated.

In the above case, by properly selecting the curvature of the guide rail 3, the natural period of the weight 5 can be matched with the natural period of the structure 1. That is, since the natural period T can be obtained by the equation T = 2π (R / g) ^1/2 , T can be determined by determining R (the radius of curvature of the guide rail 3). Therefore, if the natural period of the structure 1 is clear, R can be determined, and the weight 5 will perform single string vibration at the natural period determined by R, and the structure period and the weight 5 will resonate. The weight 5 enables a large stroke.

Further, in the above, the weight 5 resonates because it is tuned to the swing of the structure 1, and if the swing is large, it will shake too much as it is, but in the present invention, on the base frame 2. It is equipped with an electromagnetic force attenuator I in which the front and rear magnets 8 attached to the lower surface of the weight 5 are attached to the suction plate 7 fixed to the weight 5, so that the magnet 8 is optimal for the repeated movement of the weight 5. It is possible to prevent the swinging of the weight 5 excessively by providing a sufficient damping and reduce the swinging of the structure 1 at the same time. In this case, the damping force is adjusted by the magnet 8
This is done by controlling the magnetic flux of. If the magnet 8 is a permanent magnet, the method is to increase or decrease the number of magnets to be installed or attract the attraction plate 7.
By adjusting the relative positions of the magnet 8 and the magnet 8, the magnitude of the magnetic flux density is adjusted. On the other hand, in the case of an electromagnet, since the damping force can be adjusted by changing the exciting current, the optimum damping force can be obtained. Further, since the magnet 8 and the attraction plate 7 are not mechanical ones such as a hydraulic damping device, the structure is simple and there are few failures, and maintenance is easy.

Next, (a), (b), (c) and (d) in FIG.
(E), (F), and (G) show other embodiments of the present invention, and show examples of changing the positional relationship between the magnet 8 as the electromagnetic force attenuator I and the attraction plate 7. That is, in the embodiment shown in FIG. 1, the front and rear magnets 8 are attached to the lower surface side of the weight 5 via the attachment members 9, and the suction plate 7 is attached to the base frame 2 side so that they are opposed to each other in the front-rear direction. In the case of FIG. 2A, the front and rear magnets 8 are attached to both side surfaces of the attachment member 9 projecting from the lower surface of the weight 5, while the suction plate 7 is provided.
2 are attached to the side of the base frame 2 so that they are opposed to each other in the front-rear direction. Further, in the case of FIG. 2B, the magnet 8 is attached to the lower surface of the weight 5. The suction plate 7 is mounted on the base frame 2 so that they are opposed to each other in the vertical direction.
In the case of FIG. 2C, the arrangement relationship shown in FIG. 2B is turned upside down. On the other hand, in the case of FIG. 2D, the suction plates 7 are attached to the front and rear two places on the lower surface of the weight 5, and the magnets 8 are attached to the positions sandwiching the suction plates 7 in the front and rear via the attachment members 9. Place the electromagnetic force attenuator I
2 are provided at the front and rear, and in the case of FIG. 2 (e), two sets of electromagnetic force attenuators I are provided at the front and rear by the combination of the magnet 8 and the attraction plate 7 shown in (a) of FIG. In the case of FIG. 2F, in the configuration of the electromagnetic force attenuator I shown in FIG. 2D, the magnet 8 is provided only on one side, and the magnet 8 and the attraction plate 7 are used. In the case of (g) of FIG. 2, the arrangement relationship shown in (f) of FIG. 2 is upside down.

These (a), (b), (c) and (d) in FIG.
Even if any of the embodiments shown in (e), (f), and (e) is adopted, the same operational effect as in the case of the embodiment of FIG. 1 can be obtained.
In each of the above embodiments, the number of magnets 8 attached in the left-right direction may be plural or single.

FIG. 3 shows still another embodiment of the present invention. Similar to the above embodiment, a weight 5 and a wheel 6 are provided between the front and rear guide rails 3 fixed on the base frame 2. In the configuration in which it is movably arranged through
Is used as a wheel 6a made of a magnet to hold electromagnetic force, and the guide rail 3 is made to function as a suction plate for the wheel 6a made of a magnet so that the wheel 6a and the guide rail 3
The electromagnetic force attenuator I is configured by the above.

In the case of the embodiment of FIG. 3, the magnet 8 and the attraction plate 7 shown in the above embodiment are not required separately, so that the structure can be further simplified.

Next, FIG. 4 shows still another embodiment of the present invention. A monorail 3a is used as the guide rail 3, and a plurality of wheels 6 appropriately arranged on the monorail 3a.
The weight 5 is movably mounted via the via, and the weight 5 is placed between the lower surface of the weight 5 and the upper surface of the monorail 3a, for example, as shown in FIG.
The electromagnetic force attenuator I having the same structure as that shown in (A) is provided. In the embodiment of FIG. 4, the wheels 6 may be made of magnet and the monorail 3a may have the function of a suction plate, as in the embodiment of FIG.

If the monorail system is adopted as in the embodiment shown in FIG. 4, the entire apparatus can be made compact.

Further, (a) and (b) of FIG. 5 show still another embodiment of the present invention. In the same construction as the embodiment shown in (a) and (b) of FIG. Instead of using the electromagnetic force attenuator I in combination with the suction plate 7, the air resistance plate 13 is provided on the lower surface of the weight 5 via the support member 12 so as to project in the direction orthogonal to the moving direction of the weight 5. Is provided.

In the case of the embodiment shown in (a) and (b) of FIG. 5, it is possible to suppress the excessive swing of the weight 5 by the air resistance of the air resistance plate 13 to provide the optimum damping. At this time, the adjustment of the air resistance, which is the damping force, is achieved by changing the shape of the air resistance plate 13, increasing or decreasing the number of the air resistance plates 13, or forming a hole.

Further, (a) and (b) of FIG. 6 show still another embodiment of the present invention. In the same structure as the embodiment shown in (a) and (b) of FIG. Instead of the plate 13, a propeller (or fan) 14 is attached to the lower surface side of the weight 5.

In the case of the embodiment shown in (a) and (b) of FIG. 6, the excessive swing of the weight 5 can be suppressed by controlling the air volume generated by the propeller 14, and optimum damping can be provided. In this case, the installation location of the propeller 14 can be arbitrarily selected not only on the lower side of the weight 5 but also on the upper side thereof, and the number of installations can be arbitrarily increased or decreased. Further, a variable pitch propeller (or variable pitch fan) may be used as the propeller 14, and in this case, the damping force can be easily adjusted by variably adjusting the direction of the propeller 14.

The present invention is not limited to the above embodiment, but the guide rail 3 is not a true arc shape as shown in FIG. 1 as long as the guide rail 3 is curved so that the central portion bulges downward. However, for example, it has a polygonal line shape as shown in FIG. 7A, or a V shape as shown in FIG.
It may have a curved shape, or in the embodiment of FIGS. 5 and 6, a monorail system may be used as shown in the embodiment of FIG. 4, and further, in the embodiment, a structure such as a building may be used. Although the example of application to the object 1 has been shown, it is needless to say that it can be applied to any structure as long as the structure causes shaking, and various modifications can be made within the scope not departing from the gist of the present invention.

[0032]

As described above, according to the anti-sway device of the present invention, the following excellent effects are exhibited. (i) A pair of guide rails with a required curved shape are fixed in parallel on a base frame provided on the structure, and the vibration damper is movably arranged along the guide rails to make it unique. Since the period is given by bending the guide rails, mechanical parts for adjusting the natural period are not required, a large stroke can be realized with a simple structure and a large damping effect can be obtained. Since the damping of the repeated movement of the body can be given by the electromagnetic force attenuator, it is easy to adjust the optimal damping, and there is less deterioration and failure compared to the mechanical damping device and maintenance is possible. Is easy. (ii) As an electromagnetic force attenuator, the wheels of the vibration damper have electromagnetic force, and the guide rail has a function of a suction plate for the electromagnetic force, whereby the structure can be further simplified. (iii) Instead of using an electromagnetic force attenuator, an air resistance plate is overhanging on the vibration suppressor to suppress the excessive vibration of the vibration suppressor by the air resistance and to provide a damping force. You can (iv) By using a propeller instead of the air resistance plate, it is possible to provide a damping force that suppresses excessive vibration of the vibration suppressor by the aerodynamic force generated by the propeller. (v) By making the guide rail a monorail, it is possible to make the entire device compact.

[Brief description of drawings]

1A and 1B show an embodiment of an anti-sway device according to the present invention, in which FIG. 1A is a front view, and FIG.

FIG. 2 shows another embodiment of the present invention.
(B), (c), (d), (e), (f), and (g) are schematic diagrams showing different configuration examples of the electromagnetic force attenuator.

FIG. 3 is a cut end view showing still another embodiment of the present invention.

FIG. 4 is a cut side view showing still another embodiment of the present invention.

FIG. 5 shows still another embodiment of the present invention.
Is a front view, and (b) is a central cut end view.

FIG. 6 shows still another embodiment of the present invention.
Is a front view, and (b) is a central cut end view.

FIG. 7 is a schematic view showing an example of the shape of a guide rail, in which (a) shows a case where the guide rail has a broken line shape, and (b) shows a case where the guide rail has a V shape. .

FIG. 8 is a schematic view showing an example of a conventional shake prevention device.

[Explanation of symbols]

 1 structure 2 base frame 3 guide rail 3a monorail 5 weight (vibration damping body) 6, 6a wheel 7 suction plate 8 magnet (electromagnetic force holding member) 13 air resistance plate 14 propeller I electromagnetic force attenuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Yata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries, Ltd. Technical Research Institute (72) Inventor Kengo Otsuka Shin Isogo-ku, Yokohama-shi, Kanagawa Nakahara-cho 1 Ishikawajima-Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Inventor Murata Tamotsu, Koto-ku, Tokyo 3-1-15-1 Toyosu Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center

Claims (5)

[Claims] 1. A base frame is provided on an anti-sway structure, and a pair of guide rails curved so that a central portion thereof bulges downward are fixedly supported in parallel with the base frame. A damping body is movably mounted on both guide rails via wheels at both ends, and either one of an electromagnetic force holding member such as a magnet constituting an electromagnetic force attenuator and a suction plate is mounted on the vibration damping body. An anti-sway device having a structure in which the other side is attached to the upper surface of the base frame on the lower surface of the body to give a damping force to the vibration damping body. 2. An electromagnetic force attenuator composed of an electromagnetic force retaining member and a suction plate is replaced, and electromagnetic force is retained in the wheels of the vibration damper,
2. The anti-sway device according to claim 1, wherein the guide rail has a function of the suction plate against the electromagnetic force. 3. An anti-sway device according to claim 1, wherein instead of the electromagnetic force attenuator, an air resistance plate is attached to the vibration damper so as to project in a direction orthogonal to the moving direction of the vibration damper. 4. The anti-sway device according to claim 3, wherein a propeller is provided instead of the air resistance plate. 5. The guide rail is a monorail instead of movably mounting the damping body on the pair of guide rails via wheels at both ends, and the monorail is provided on the guide rail.
5. The anti-sway device according to claim 1, 2, 3 or 4, wherein the vibration damper is movably mounted via a plurality of appropriately arranged wheels.