JP3407116B2 - Damping device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed on a structure such as a suspension bridge tower, a super-high-rise building, a tower, a steel tower or the like, and a wind load (aerodynamic force) of these structures is provided. The present invention relates to a vibration control device used to attenuate vibrations at an early stage by suppressing vibrations caused by an earthquake or vibrations caused by an earthquake. 2. Description of the Related Art As a vibration control device of this type, the vibration of a structure can be reduced by converting the vibration energy given to the structure into the kinetic energy of a weight and attenuating the energy efficiently. Such a configuration is already known (JP-A-3-163238). This is a development of a simple pendulum. As shown in FIG. 3, a base frame b is mounted on the top of a structure a and a required space is provided on the base frame b at a required interval as shown in FIG. A total of four support rollers c are installed at a total of four places, and a weight d as a vibration control mass having a V-shaped bottom surface is oscillated in a single string in the left and right direction on each of the left and right support rollers c. It is swingably installed to form a spring system by restoring force using gravity, and left and right projections e are provided on both front and rear side surfaces of the weight d, and the weight d is installed at a position sandwiching the weight d in front and rear. The left and right buffers g corresponding to the protrusions e are attached to the gantry f so that the swing region of the weight d is restricted in a range where the protrusions abut on the buffer g. By swinging the building 90 degrees behind the shaking of the building, Les are as be reduced to or fast. [0003] However, in the case of the vibration control device using the weight d having the V-shaped bottom, the weight d
Since the oscillation period is determined by the radius from the center of oscillation when the object swings like a pendulum, it is difficult to adjust the natural period once the period is set. For this reason, recently, a device capable of adjusting the natural period of a weight has been proposed, and has already been filed by the present applicant (Japanese Patent Application No. 5-219223).
issue). This means that a weight is slidably mounted on left and right support rollers via rails that can be bent in a V-shape, and between both ends of the weight and the V-shaped rail. The natural cycle adjusting liner is interposed, and the V-shaped angle of the V-shaped rail can be changed by the thickness of the liner. [0005] The method of the present invention has the advantage that the V-shaped angle of the V-shaped rail can be changed, so that the natural period can be easily adjusted. An object of the present invention is to take the above-mentioned recently applied system one step further so that the natural period can be easily adjusted even during operation of the apparatus. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, ends of right and left rails are directly connected to each other with a hinge by abutting one end of the rail so as to form a V-shape. A V-shaped rail capable of adjusting the V-shaped angle is slidably mounted on a support roller which is spaced apart, and a laterally elongated weight is placed on the V-shaped rail. Is mounted in parallel with the longitudinal direction of the V-shaped rail, and the center of the weight is bracketed to the hinge so that the distance between the center of the weight and the hinge of the V-shaped rail is constant. , And between the lower surface of both ends of the weight and both ends of the V-shaped rail, by changing between both ends of the weight and both ends of the V-shaped rail. V of mold rail
An actuator for changing the character angle around the hinge to adjust the natural period is interposed. When the weight is placed on the V-shaped rail and is oscillated on the support roller, the vibration damping mass can be equivalent to a simple pendulum. Also, by changing the amount of expansion and contraction of an actuator such as a jack interposed between both ends of the V-shaped rail and both ends of the weight, the V-shaped angle of the V-shaped rail can be changed arbitrarily around the hinge. Therefore, the natural period can be changed even during operation. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which a base frame 2 is mounted on the top of a structure 1 which swings under an external force.
And two support rollers 3 are installed on the base frame 2 at right and left intervals with a required space therebetween, and four ends of the right and left rail bodies 4a are V-shaped on the left and right support rollers 3. A V-shaped rail 4 which is connected by a hinge 5 so that the angle of the V-shape can be adjusted so as to form a mold is placed on the V-shaped rail 4 so as to be swingable in the left-right direction. The weight 6 as the vibration control mass is lengthened in the lateral direction and placed so as to be parallel to the longitudinal direction of the V-shaped rail 4, and the center of the weight 6 is connected to the rail bodies 4a. It is connected to the joined hinge 5 via a bracket 7, and both ends of the weight 6,
An electric jack 9 which can be expanded and contracted by driving a motor 8 is vertically interposed between the V-shaped rail 4 and both ends of the V-shaped rail 4. And the weight 6
Can be swung together with the V-shaped rail 4 so as to oscillate in a single string in the left-right direction on the support roller 3 to form a spring system by a restoring force using gravity. A controller 13 is provided for mounting the swing sensor 12 and calculating a signal detected by the shake sensor 12 and sending a drive command to the motor 8 of the jack 9. The controller 13 responds to changes in the vibration characteristics of the structure 1 from the controller 13. By sending the drive command to the motor 8 to adjust the expansion and contraction of the jack 9, the natural period of the weight 6 can be adjusted. Further, protrusions 14 are provided at the left and right sides of the front and rear sides of the weight 6, and a left and right buffers 16 corresponding to the protrusions 14 are mounted on a mount 15 which is disposed at a position sandwiching the weight 6 in the front and rear directions. And the protrusion 14 is
The swinging region of the weight 6 is restricted within the range of contact with the weight 6, and the weight 6 swings at a phase delayed by 90 degrees with respect to the swing of the structure 1. Is quickly reduced. When the structure 1 is shaken by an earthquake or the like, the weight 6 swings right and left integrally with the V-shaped rail 4 on the left and right support rollers 3 so as to perform single string vibration. Operates as a U-shaped mass. That is, when the apparatus is configured as a hybrid type, for example, the weight 6 is driven by shifting the phase by 90 degrees with respect to the swing of the structure 1 by a weight drive motor mounted coaxially with the support roller 3. Therefore, the swing of the structure 1 can be attenuated. On the other hand, in the case of a passive type, the swing energy given to the weight 6 with a delay of 90 degrees due to the swing of the structure 1 is attenuated by a damper or the like. Thus, the swing of the structure 1 can be attenuated. In the above description, it is necessary to make the natural period of the weight 6 coincide with the natural period of the structure 1 in order to optimally apply the vibration damping force to the structure 1. 6 can be easily adjusted even during operation. That is, although the natural period of the device itself is determined by the V-shaped angle of the V-shaped rail 4, the right and left jacks 9 interposed between both ends of the weight 6 and both ends of the V-shaped rail 4 are provided. When the amount of expansion and contraction is changed by driving the motor 8, the angle of the V-shape about the hinge 5 of the V-shaped rail 4 changes, and the swing locus of the weight 6 can be changed. The natural period of the device itself can be adjusted. Here, the adjustment of the natural period will be described in comparison with the device of FIG. Now, assuming that the weight 6 is a pendulum in the apparatus shown in FIG. 2 without the jack 9, the radius which is the distance from the pendulum center O to the center of gravity G of the weight 6 is r '. On the other hand, as in the apparatus of the present invention shown in FIG. 1, the jack 9 interposed between the right and left ends of the weight 6 and the right and left ends of the V-shaped rail 4 is extended to form the V-shaped rail 4. When the V-shaped angle is widened, the radius from the pendulum center O to the center of gravity G of the weight 6 becomes r longer than the above r '. That is, in the case of the apparatus shown in FIG. 2, the period is short because the pendulum length is short, and in the case of the apparatus shown in FIG. 1, the period is long because the pendulum length is long. Therefore, the shaking caused by disturbance of the structure 1 is detected by the shaking sensor 12, which is calculated and analyzed by the controller 13 every moment to obtain a shaking period, and the motor 8 is driven by a driving command according to the vibration characteristics of the structure 1. By driving and adjusting the amount of expansion and contraction of the jack 9, the period of the weight 6 can be completely synchronized with the period of the structure 1. Further, the weight 6 does not need to be formed in an arc shape and can be formed in any shape, which is advantageous in terms of machining. Although the present invention has been described with reference to the embodiment in which the V-shaped angle of the V-shaped rail 4 is changed by the jack 9, other operating devices such as a pantograph device, a cylinder device, etc. Of course, various changes can be made without departing from the spirit of the present invention. As described above, according to the vibration damping device of the present invention, the ends of the left and right rails are directly connected to each other with a hinge by abutting each other so as to form a V shape. V
A V-shaped rail capable of adjusting the V-shaped angle is slidably mounted on a support roller arranged at a distance, and a laterally elongated weight is placed on the V-shaped rail. V
Placed in parallel with the longitudinal direction of the V-shaped rail, the center of the weight is connected to the hinge via a bracket so that the center between the weight and the hinge of the V-shaped rail is constant. The V-shaped rail is connected by changing the distance between both ends of the weight and both ends of the V-shaped rail between the lower surfaces of both ends of the weight and both ends of the V-shaped rail. Since the actuator is interposed to change the V-shaped angle around the hinge to adjust the natural period,
The following excellent effects can be exhibited. (1) Vibration control effect can be obtained by the kinetic energy of single-string vibration. (2) Since the V-shaped angle of the V-shaped rail can be adjusted by an actuator interposed between both ends of the V-shaped rail and both ends of the weight, the natural period of the weight can be adjusted even during operation. It can be easily and completely matched to the structure, so that it is possible to cope with a periodic shift due to aging of the structure on site. (3) In particular, in the case of a hybrid type, the motor power for driving the weight is small, thereby reducing the heat, vibration and noise generated from the motor, and reducing Because the influence of the environment can be suppressed as much as possible, energy saving and compactness can be achieved, and the motor power can be reduced, so that the weight swings significantly during a disturbance compared to the same level of motor driving force. And a high damping effect can be obtained. (4) Since the center of the weight is connected to the hinge of the V-shaped rail via a bracket so that the distance between the center of the weight and the hinge does not change, the height of the support roller is high. In addition, the height of the entire device is suppressed and the size can be reduced, and the weight is restrained by the V-shaped rail. Therefore, between the both ends of the weight and both ends of the V-shaped rail by the operating device. Is changed, the V-shaped angle of the V-shaped rail is uniquely determined, so that the angle adjustment of the V-shaped rail becomes easy. (5) Similarly to the above (4), the center of the weight is connected to the hinge of the V-shaped rail via a bracket, and the center of the weight and the V
The center of gravity of the V-shaped rail including the weight does not change because the hinge connection portion of the V-shaped rail is prevented from being relatively displaced in the vertical direction. Even if the V-shaped angle is changed, the position where the vibration control force acts on the building does not change, and a stable control force can be applied to the building. (6) Since the actuating device is interposed between the lower surface of both ends of the weight and both ends of the V-shaped rail, compactness can be achieved and the angle adjustment of the V-shaped rail can be performed with a simple configuration. .

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 diagram showing a vibration damping device having no jack and comparing the length of a pendulum radius with the vibration damping device shown in FIG. 1; FIG. 3 is a schematic diagram showing an example of a single-string vibration type vibration damping device using an arc-shaped weight. [Description of Signs] 3 Support roller 4 V-shaped rail 4a Rail body 5 Hinge 6 Weight 9 Jack (actuator)

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Nakamura 1-19-10 Mohri, Koto-ku, Tokyo Ema Tadashi Building Ishikawajima-Harima Heavy Industries Co., Ltd.Koto Office (72) Inventor Masanori Maruoka, Tokyo, Koto-ku, Tokyo 19-19 Chome Ema Tadashi Building Ishikawajima-Harima Heavy Industries Co., Ltd.Koto Office (72) Inventor Tamotsu Murata 1-19-10 Mori Koto-ku, Tokyo 1-19-10 Ema Tadashi Building Ishikawajima-Harima Heavy Industries Co., Ltd.Koto Office (72) Inventor Koji Yata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref.Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Yuji Koike 1-Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. (72) Inventor Shunichi Yamada Kashima Construction Co., Ltd. Inventor Tomohiko Arita Kashima Construction Co., Ltd., 1-2-7 Moto Akasaka, Minato-ku, Tokyo (72) Inventor Yasushi Kurokawa Kashima Construction Co., Ltd. (72), 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Person Koji Ishii Kashima Construction Co., Ltd. Technical Research Institute No. 191-1 Tobita-Ki 2-chome, Chofu-shi, Tokyo (56) References JP-A-7-54914 (JP, A) JP-A-4-101839 (JP, U) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 15/00-15/08 E01D 1/00 E04H 9/02 341

Claims (1)

(57) [Claim 1] The ends of the left and right rails are butted so as to form a V-shape and directly connected by a hinge, and the V-shape can be adjusted around the hinge. The V-shaped rail is slidably mounted on a support roller that is spaced apart, and a laterally elongated weight is placed on the V-shaped rail in the longitudinal direction of the V-shaped rail. Placed in parallel, the center of the weight is connected to the hinge via a bracket so that the center of the weight and the hinge of the V-shaped rail are constant, and the weight is Between the both ends of the weight and both ends of the V-shaped rail between the lower surfaces of both ends of the V-shaped rail and both ends of the V-shaped rail.
A vibration damping device having a configuration in which an actuating device is interposed for adjusting a natural period by changing a character angle around a hinge.