JP3067226B2 - Damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention suppresses vibrations caused by wind loads (aerodynamic forces) and vibration amplitudes caused by earthquakes on suspension bridges, such as towers, high-rise buildings, towers, and steel towers. And a vibration damping device used to attenuate vibrations early.

[0002]

2. Description of the Related Art A vibration damping device of this type, which converts vibration energy given to a structure into kinetic energy of a weight and efficiently attenuates the kinetic energy can reduce vibration of the structure. Has already been filed by the present applicant (Japanese Patent Application No. 63-250955). This is a development of a simple pendulum. As shown in FIG. 5, a single string vibration is applied to a supporting roller 3 in which a weight 1 is formed on a structure 2 in a shape curved into an arc. A rack 4 is provided along the vibration direction on the upper surface of the weight 1 so that the rack 5 can be mounted on the upper surface of the weight 1, and a shaft 5 arranged above the rack 4 so as to be orthogonal to the rack 4 is connected to the motor 6. And the shaft 5
In the middle of the pinion 7 so as to mesh with the rack 4
Is mounted, and the pinion 7 is rotated via the shaft 5 by driving of the motor 6 so that the weight 1 can be moved together with the rack 4 at a required period.

According to the vibration damping device described in Japanese Patent Application No. 63-250955, when a vibration occurs in the structure 2 due to aerodynamic force or the like, a vibration is detected by a vibration detection sensor installed in the structure 2. A motion in which the motor 6 is driven to perform a single-string vibration on the weight 1 with a delay of 90 ° with respect to the swing of the structure 2 by sending a drive command to the motor 6 by controlling the phase of the signal with the phase control device. The energy is applied and the energy is applied to the structure 2 in an optimum state, whereby the swing of the structure 2 can be suppressed quickly.

[0004]

However, in the case of a single-string vibration type vibration damping device using the above-described arc-shaped weight, it is difficult to machine the weight into an arc shape when the size becomes large.
In addition, after determining and manufacturing the weight shape and mass so as to obtain the desired natural frequency, it is difficult to adjust the natural frequency during operation due to its configuration. Since the roller 3 and the pinion 7 must be assembled as separate shaft members, there is a problem that the structure becomes complicated and the assembling work becomes complicated.

Accordingly, the present invention provides a vibration damping device that can be easily manufactured with a large weight and that can be easily increased in size. Further, it is possible to easily adjust the natural frequency and simplify the structure. What you want to do.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a weight is slidably mounted on the upper portion of a structure via left and right support rollers, and the weight is oscillated on the weight. A rack extending in the movement direction is provided, a pinion meshed with the rack is provided, and a motor for rotating the pinion is provided. In the vibration damping device configured to send a drive command to a motor, the weight is a weight having a V-shaped bottom surface, the rack is provided on the bottom surface of the weight, and the left and right support rollers are supported. A roller supporting frame is provided on the base so as to be movable in the left-right direction, and an interval adjusting device is connected to the roller supporting frame.

A weight is slidably mounted on the upper part of the structure via left and right support rollers, and a rack extending in the swinging direction is provided on the weight, and a pinion meshed with the rack is provided. And a motor that rotates the pinion, wherein a phase control device controls the phase of a signal from a shake detection sensor that detects the shake of the structure, and sends a drive command to the motor. The weight is a weight whose bottom is formed in a V-shape, and the rack is provided on the bottom of the weight,
Further, the pinion is attached to the shaft of the support roller, so that the shaft of the support roller and the axis of the pinion are coaxial.

[0008]

Since the bottom of the V-shaped weight is straight, it is easy to manufacture and can be easily enlarged. When the weight is swung on the supporting roller, it is equivalent to a simple pendulum. And the vibration of the structure is suppressed.

When the roller supporting frame is moved by the distance adjusting device, the distance between the right and left supporting rollers can be changed, so that the natural frequency is changed.

Further, by making the shaft of the support roller and the shaft of the pinion coaxial, one of the shaft of the support roller and the shaft of the pinion in the conventional system can be omitted, so that the number of parts can be reduced and the structure can be simplified. Is done.

[0011]

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

FIG. 1 shows an embodiment of the present invention. A weight is slidably mounted on an upper part of a structure 2 via left and right support rollers 3 and the oscillating direction is applied to the weight. A pinion 7 meshed with the rack, and a motor for rotating the pinion 7, and a phase control device controls the phase of a signal of a vibration detection sensor for detecting the vibration of the structure by the phase control device. In the vibration damping device configured to send a drive command to a motor, the weight is a weight 13 having a V-shaped bottom surface, and a linear rack 14 is provided on the bottom surface of the weight 13.
And a roller support frame 15 for supporting the left and right support rollers 3 is provided on the base 8 so as to be movable in the left-right direction, and an interval adjusting device is connected to the roller support frame 15. In detail, the structure 2
A guide rail 10 extending in the left-right direction is laid on a base 8 provided on the upper part of the base, and a gantry 9 as a roller support is separately placed on the guide rail 10, and each gantry 9 is mounted.
The support roller 3 is mounted on the roller support frame 15 erected on the upper side.
Are rotatably supported, and a motor 11 is installed on the base 8 as a device for adjusting the distance between the left and right support rollers 3, and a screw shaft 12 connected to a shaft of the motor 11 is mounted on the mount 9. The gantry 9 is moved along the guide rail 10 by screwing and rotating the screw shaft 12 by driving of the motor 11 so that the roller support frame 15 is moved.
The distance between the right and left support rollers 3 supported by the first and second support rollers can be changed.

A weight 13 having at least a V-shaped bottom surface is swingably mounted on the left and right support rollers 3 so as to oscillate in a single string in the left-right direction, and is restored using gravity. A motor that constitutes a spring system by force, and provides a rack 14 on the bottom surface of the weight 13 along the vibration direction, meshes a drive pinion 7 with the rack 14, and installs the drive pinion 7 on a gantry 9. , The torque of the drive pinion 7 is transmitted to the rack 14 so that the weight 13 can be swung.

The support roller 3 and the drive pinion 7 are
Although they are coaxially arranged in the drawing, they may be arranged separately.

In a state where the vibration damping device having the above-described configuration is installed on the top of the structure 2, a vibration detection sensor (not shown) is installed on the structure 2 due to an earthquake or wind load. ), The motor is driven in a predetermined direction by a drive command from a phase control device (not shown) based on the detection signal, and the driving force is transmitted to the drive pinion 7, so that the weight 13 It can be swung on the support roller 3 together with the rack 14. At this time, the swing of the structure 2 is effectively attenuated by repeatedly moving the weight 13 as a damping mass by shifting the phase by 90 ° with respect to the swing of the structure 2. The bottom of the weight 13 is a straight line (plane).
Because of the V-shape formed by the combination of the above, it is easy to manufacture even when the size is increased, which is extremely advantageous in terms of processing as compared with the case where the arc-shaped weight 1 as shown in FIG. 5 is manufactured.

In the above description, it is necessary to make the natural frequency of the weight 13 coincide with the natural frequency of the structure 2 in order to optimally apply the vibration damping force to the structure 2. The adjustment of the natural frequency of the ridge 13 can be easily performed even during operation. That is, when the screw shaft 12 is rotated by the drive of the motor 11, the rotational force is transmitted to the gantry 9 and the gantry 9 is moved along the guide rail 10. As a result of changing the distance between the support rollers 3, the natural frequency can be adjusted.

Here, the adjustment of the natural frequency will be described in detail with reference to the schematic diagram of FIG. Now, let the gravity acceleration of the weight 13 be g, and the length from the bending point to the end of the weight 13 be L
Then, the natural frequency f of the vibration damping device is

[0018]

(Equation 1) Here, γ: cos α / 2 α: V-shaped angle of the weight 13 β: L / RR R: Length from the bending point of the weight 13 to the roller support point can be obtained. Also, the distance D between the support rollers 3
Can be expressed as: D = 2R sin α / 2 (2)

Therefore, from the above equations (1) and (2), D
Is changed, R changes and β changes, so that f changes. FIG. 3 shows this relationship in a graph.

FIG. 4 shows a specific example in which the support roller 3 and the drive pinion 7 in the embodiment of FIG. 1 are coaxially arranged. That is, in a configuration similar to that shown in FIG. 1, one end of a shaft 16 is connected to an output shaft of a motor 6 installed as a driving device on an end of a gantry 9,
6, the support roller 3 is rotatably attached to both ends, and the pinion 7 is integrally attached to the center of the shaft 16,
The drive pinion 7 is rotated by rotating the shaft 16 by the motor 6. When it is not necessary to adjust the natural frequency, the motor 6 may be installed on the base 8, and the roller support frame 15 may be directly erected on the base 8.

In the embodiment shown in FIG. 4, one shaft 16 is shared by the shaft of the supporting roller 3 and the shaft of the pinion 7, so that the shaft of the supporting roller 3 which is originally required individually is Either one of the shafts of the pinion 7 can be omitted, and the number of parts can be reduced. Therefore, the structure is simplified and the assembling work is also facilitated.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.

[0023]

As described above, according to the vibration damping device of the present invention, the weight is slidably mounted on the upper part of the structure via the left and right support rollers, and is oscillated by the weight. A rack extending in the direction, a pinion meshed with the rack, and a motor for rotating the pinion. In the vibration damping device configured to send a drive command to the weight, the weight is a weight whose bottom is formed in a V shape, the rack is provided on the bottom of the weight, and the left and right support rollers are supported. Since the roller support frame is provided on the base so as to be movable in the left-right direction, and an interval adjusting device is connected to the roller support frame, the weight is equivalent to a vibration damping mass similar to a single pendulum. And can The vibration of the structure can be suppressed by the movement of the weight, and since the weight is a combination of flat surfaces, even when the weight is increased, it is easier to manufacture than the arc-shaped weight, In addition, since the interval between the supporting rollers can be changed by the interval adjusting device, the natural frequency can be easily adjusted even during operation, and the axis of the supporting roller and the axis of the pinion can be coaxial. As a result, one of the shaft of the support roller and the shaft of the pinion, which are separately provided, can be omitted, and the number of parts can be reduced, so that the structure can be simplified. .

[Brief description of the drawings]

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

FIG. 2 is a schematic view of the vibration damping device of the present invention.

FIG. 3 is a graph showing a relationship between a natural frequency and a support roller interval.

FIG. 4 is a schematic view showing an example in which a support roller and a pinion are coaxially arranged, corresponding to a side view of FIG. 1;

FIG. 5 is a schematic diagram showing an example of a single-string vibration type vibration damping device using an arc-shaped weight.

[Explanation of symbols]

 Reference Signs List 3 support roller 6 motor (drive device) 7 drive pinion 8 base 11 motor (interval adjustment device) 13 weight 14 rack 15 roller support frame 16 axis

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Morita 1-19-10 Mohri, Koto-ku, Tokyo Ema Tadashi Building Inside the Koto office of Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Koji Yata Isogo, Yokohama-shi, Kanagawa No. 1, Shin-Nakahara-cho, Ishikawa-jima Harima Heavy Industries, Ltd. (72) Inventor Yuji Koike No. 1, Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. JP-A-3-33524 (JP, A) JP-A-3-33525 (JP, A) JP-A-61-70243 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 15/02 -15/08 E04H 9/02 341 E01D 1/00

Claims (2)

(57) [Claims] 1. A weight is mounted on an upper portion of a structure so as to be swingable via left and right support rollers, and a rack extending in the swinging direction is provided on the weight, and a pinion meshed with the rack. And a motor that rotates the pinion, wherein a phase control device controls the phase of a signal from a shake detection sensor that detects the shake of the structure, and sends a drive command to the motor. The weight is a weight having a V-shaped bottom surface, the rack is provided on the bottom surface of the weight, and a roller support frame for supporting the left and right support rollers is provided on the base so as to be movable in the left-right direction. A vibration damping device having a configuration in which an interval adjusting device is connected to the roller support frame. 2. A pinion in which a weight is swingably mounted on the upper part of a structure via left and right support rollers, and a rack extending in the swing direction is provided on the weight, and a pinion meshed with the rack. And a motor that rotates the pinion, wherein a phase control device controls the phase of a signal from a shake detection sensor that detects the shake of the structure, and sends a drive command to the motor. The weight is a weight whose bottom is formed in a V shape, the rack is provided on the bottom of the weight, and the pinion is attached to a shaft of the support roller,
A vibration damping device having a configuration in which a shaft of a support roller and a shaft of a pinion are coaxial.