JP7273258B2 - Vibration control device and vibration control method using the same - Google Patents

Description

The present invention relates to a vibration control device and a vibration control method using the same.

Controlling the large displacement vibration associated with the resonance phenomenon when a system with a long-period natural period, such as a skyscraper, is subjected to long-period ground motion has become a major problem. Conventionally, pendulum-type mass dampers and translation-type tuned mass dampers have been used in many cases as measures to improve this problem.

In a pendulum mass damper, the period is determined by the length of the pendulum (l), so a long pendulum and a large mass are required to control a large-scale system with a long period. In a translational tuned mass damper, the period is determined by the square root of the ratio (m/K) between the mass (m) and the stiffness (K) of the spring. mass is required. Therefore, these dampers are large-scale facilities, and a large-scale space is required to install them.

Further, Patent Literature 1 below describes a rolling type vibration damping device. However, the operation of this device is basically the same as existing tuned mass dampers and suffers from similar problems.

JP-A-11-94016

The present invention has been made in view of the circumstances described above. One of the main purposes of the present invention is to provide a technology that can control large displacement vibrations associated with resonance phenomena in long-period systems using significantly smaller facilities and spaces than conventional methods. That is.

Means for solving the above problems can be described as the following items.

(Item 1)
comprising a support, a rotating body, and a concentrated load section,
The support has a substantially concave curved support surface that is downwardly convex,
The rotating body is arranged on the support surface so as to be able to roll along the support surface,
A vibration damping device, wherein the concentrated load portion is arranged on the roller so as to make the center of gravity of the rotor eccentric from the axis of rotation of the rotor when it rolls.

(Item 2)
The vibration damping device according to item 1, wherein the outer peripheral surface of the rotating body has a substantially cylindrical surface shape.

(Item 3)
3. A vibration damping device according to item 1 or 2, wherein the support surface of the support has a substantially cylindrical surface shape.

(Item 4)
In addition, it has an anti-slip part,
The vibration damping device according to any one of items 1 to 3, wherein the anti-slip portion is configured to reduce relative slippage between the support surface and the outer peripheral surface of the rotating body.

(Item 5)
Item 5. A vibration damping device according to item 4, wherein the anti-slip portion is a gear belt attached to the surface of the support surface and the outer peripheral surface of the rotating body.

(Item 6)
The vibration damping device according to any one of items 1 to 5, wherein the concentrated load portion is configured to eccentrically move the center of gravity of the rotating body upward.

(Item 7)
Furthermore, it has a holding part,
The vibration damping device according to any one of items 1 to 6, wherein the holding portion is configured to restrict the separation of the rotating body from the supporting surface.

(Item 8)
A vibration control method using the vibration control device according to any one of items 1 to 7,
A vibration control method, wherein the natural period of the vibration control device corresponds to the primary mode or secondary mode of the natural period of the structure to be controlled.

(Item 9)
A vibration control method using a plurality of vibration control devices according to any one of items 1 to 7,
A vibration control method, wherein the plurality of vibration control devices are arranged in a structure such that the rotation axis directions of the rotating bodies are different from each other.

(Item 10)
A method for damping a structure having multiple floors using the damping device according to any one of items 1 to 7, comprising:
The vibration control method, wherein the vibration control devices are respectively installed on different floors of the structure.

(Item 11)
A structure in which the vibration control device according to any one of items 1 to 7 is arranged.

ADVANTAGE OF THE INVENTION According to this invention, the vibration in the system to be controlled can be passively controlled by rolling the rotating body on the support surface of the support. In addition, the present invention has a simpler structure for transmitting the movement of the weight to the structure compared to the conventional pendulum type mass damper and translational synchronous mass damper, and can perform long-period control with a much smaller size. be possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is typical explanatory drawing which shows schematic structure of the vibration control apparatus which concerns on 1st Embodiment of this invention. FIG. 2 is an explanatory diagram for explaining the operation of the vibration damping device of FIG. 1; FIG. 2 is an explanatory diagram for explaining the operation of the vibration damping device of FIG. 1; FIG. 2 is an explanatory diagram for explaining the operation of the vibration damping device of FIG. 1; 1. It is explanatory drawing for demonstrating typically the magnitude|size of the specific example of the vibration damping apparatus of FIG. 1, and the vibration damping apparatus of a comparative example. 6 is a graph showing the natural period of the vibration damping device of each example shown in FIG. 5, where the horizontal axis is the angle (orbital angle) θ at which the rotating body begins to roll, and the vertical axis is the natural period. FIG. 5 is a schematic explanatory diagram showing a schematic configuration of a vibration damping device according to a second embodiment of the present invention; FIG. 10 is a schematic explanatory diagram showing a schematic configuration of a vibration damping device according to a third embodiment of the present invention; FIG. 9 is a front view of a rotating body used in the vibration damping device of FIG. 8; FIG. 10 is a perspective view of the rotating body of FIG. 9; FIG. 9 is a perspective view of a concentrated load section used in the vibration damping device of FIG. 8; FIG. 11 is a schematic explanatory diagram of a vibration damping device according to a fourth embodiment of the present invention; FIG. 12 is a schematic explanatory diagram showing the arrangement state of the vibration damping device according to the fourth embodiment of the present invention; FIG. 12 is a schematic explanatory diagram showing the arrangement state of the vibration damping device according to the fourth embodiment of the present invention;

A vibration damping device according to a first embodiment of the present invention will be described below with reference to the accompanying drawings.

(Configuration of this embodiment)
This vibration damping device includes a support 1, a rotating body 2, and a concentrated load section 3 as main components. Also, in the description of the present embodiment, it is assumed that this vibration damping device is installed and used on a floor surface 10 as the surface of a structure (for example, a building).

(support)
The support 1 has a substantially concave curved support surface 11 that is downwardly convex. The support surface 11 of this embodiment has a cylindrical shape with an axial direction extending in a direction perpendicular to the plane of FIG. 1 . The support surface 11 has a semi-cylindrical shape with an open top.

(Rotating body)
The rotating body 2 is arranged on the support surface 11 of the support 1 so as to roll along the support surface 11 . The outer peripheral surface 21 of the rotating body 2 of this embodiment has a hollow cylindrical surface shape with an axial direction extending in a direction perpendicular to the paper surface of FIG. 1 . That is, the axial direction of the rotor 2 in this embodiment is parallel to the axial direction of the support surface 11 . Further, the rotating body 2 can roll on the supporting surface 11 by rotating about the axis of the rotating body 2 while revolving about the axis of the supporting surface 11 .

(Concentrated load part)
The concentrated load part 3 is arranged inside the rotating body 2 and is configured to make the center of gravity of the rotating body 2 eccentric from the rotation axis when the rotating body 2 rolls. The concentrated load section 3 of the present embodiment is configured so that the center of gravity of the rotating body 2 (that is, the center of gravity when the concentrated load section 3 is arranged on the rotating body 2) is eccentric upward (Fig. 1).

Further, the concentrated load portion 3 of the present embodiment is configured as a weight attached to an eccentric position inside the rotating body 2 . As the configuration of the concentrated load section 3, for example, the following can be considered, but the configuration is not limited to these.
A configuration in which the center of gravity is eccentric by being integrated with the rotating body 2 and hollowing out the inside of the rotating body 2 asymmetrically with respect to the radial direction.
A configuration in which the center of gravity position is eccentric by attaching a weight made of a material having a higher specific gravity than the rotating body 2 at an eccentric position inside the rotating body 2 as a concentrated load part,
・Combination of these.

(Operation of this embodiment)
Next, the basic operation of the vibration damping device of this embodiment will be described. In the following description, it is assumed that the floor surface 10 vibrates in a direction intersecting the axial direction of the support surface 11 . If vibrations in different directions are expected, the installation direction of the vibration damping device is adjusted in advance, or a plurality of vibration damping devices with different orientations are used.

In the vibration damping device of this embodiment, when the floor surface 10 vibrates, the rotor 2 rolls along the support surface 11 of the support member 1 . The rolling cycle (natural cycle) of the rotating body 2 is a unique value depending on the configuration of the vibration damping device including the concentrated load section 3 . If this rolling cycle matches the vibration cycle of the structure or is sufficiently close to the vibration cycle of the structure, it has a damping effect on the vibration of the structure. Therefore, by setting this rolling period corresponding to the vibrations (for example, primary mode or secondary mode) expected in the target structure, the structure can be damped.

In addition, in this embodiment, by providing the concentrated load portion 3, the rolling period of the rotating body 2 can be lengthened compared to the case where the center of gravity of the rotating body 2 is not eccentric. In other words, the vibration damping device of this embodiment can provide a longer natural period than the conventional rolling type vibration damping device, while keeping the weight and size of the system substantially the same. Therefore, assuming the same natural period, there is an advantage that the size and weight of the device can be reduced. Then, there is also the advantage that it becomes easy to install this device at a plurality of locations in the same structure, or to arrange a plurality of devices in different directions.

Furthermore, in the present embodiment, the rotating body 2 and the concentrated load section 3 are shaped to extend in the axial direction, thereby increasing the weight of the rotating body 2 and the concentrated load section 3 and improving the vibration damping performance. It is also possible to let

(calculation example)
Next, examples of calculation of basic operating characteristics of the vibration damping device of this embodiment will be described with further reference to FIGS. 2 to 6. FIG.

The tuning period that can be realized by the vibration damping device of this embodiment is obtained by the following formula.

here,

is. The meaning of each symbol in the above is as shown below. 2 to 4 show the correspondence between these symbols and the structure in FIG. Hereinafter, the concentrated load part 3 may be referred to as an eccentric weight, and the support surface 11 or support body 1 may be referred to as a ball.

On the other hand, the tuning period of the existing system (rolling type vibration damping device in which the center of gravity of the rotating body is not eccentric) can be obtained by the following formula.

here,

is. The configuration of the existing system (comparative example) was basically the same as that of the apparatus of this embodiment, except that the rotating body was not eccentric.

Next, the difference between the two will be explained by comparing seven new systems (devices of this embodiment) with different sizes and four existing systems. The outline of each case is shown in Table 1 below and FIG. In addition, in FIG. 5, the shapes of each system are superimposed for comparison. Also, the shape of the case 8 is too large and is not included in FIG.

In Table 1, cases 1 to 4 and cases 9 to 11 are new systems (specific examples of the present embodiment), and cases 5 to 8 are existing systems (comparative examples).

For comparison, in all 11 cases, the mass of the rotating body (the sum of the rotating body and the eccentric weight in the new system) is uniform, specifically 4 kg. In Cases 1 to 4, the size of the device is fixed, and the weight ratio between the rotor and the eccentric weight is changed. In Cases 9 to 11, the size of the device is similarly fixed and the weight ratio between the rotating body and the eccentric weight is changed, but the center of gravity of the eccentric weight is set at a position lower than the center of the rotating body. Cases 5-8 of existing systems vary the radius of the support surface.

FIG. 6 shows the tuning cycle in this case. As can be seen from FIG. 6, in the cases (Cases 1 to 4) in which the center of gravity of the eccentric weight is located above the center of the rotating body, the new system and the existing system (Case 5) of the same size are compared. It can be seen that there is a large difference in the synchronization period between the and the existing system. Depending on the combination of the mass ratio of the rotating body and the eccentric weight, it is possible to tune to a period longer than 6 times. In addition, referring to cases (5 to 8) in which the size of the support surface was changed in the existing system, the tuning period in the new system was longer than that in the case where the size of the support surface was 10 times larger in the existing system. I understand. This result therefore indicates that the new system is compact in size and tunable to long periods.

In addition, in the device of this embodiment, the tuning cycle varies depending on the release angle (the angle at which rolling starts) θ of the rotating body 2 . That is, in the present embodiment, the tuning period changes depending on the revolution angle of the rotor 2 . Therefore, in this embodiment, there is an advantage that vibration damping performance can be expected for a wide natural period. Further, as shown in Cases 1 to 4, in this embodiment, a large tuning period can be obtained when the angle θ is small, so a large tuning period can be easily obtained. Also, the upper limit of θ that the rotating body 2 can take can be restricted by some mechanism.

On the other hand, it can be seen that the new systems (Cases 9 to 11) in which the center of gravity of the eccentric weight is located below the center of the rotor can be tuned to a shorter period than the existing system (Case 5) of the same size. In this way, in the new system, by changing the mass ratio between the rotating body and the eccentric weight, and the positional relationship between the center of gravity of the eccentric weight and the center of the rotating body, the period can be changed from much longer to shorter than the existing system. There is an advantage that it is possible to control the vibration of Therefore, damping control of various structures can be performed by using the damping device based on the same principle with slight changes in design parameters.

(Second embodiment)
Next, a vibration damping device according to a second embodiment of the present invention will be described mainly with reference to FIG. In the description of the second embodiment, the same reference numerals are used for elements that are basically the same as those of the first embodiment described above to avoid duplication of description.

The vibration damping device of the second embodiment further includes a holding portion 4 . The holding portion 4 has a regulating roller 41 and a support member 42 . The regulation roller 41 has a cylindrical shape, and its outer peripheral surface is in contact with the outer peripheral surface 21 of the rotating body 2 .

The regulation roller 41 is supported by a support member 42 so as to be rotatable in forward and reverse directions. The end of the support member 42 is supported by the support 1 . Further, the rotation axis of the regulating roller 41 is parallel to the rotation axis of the rotor 2 . Furthermore, in the present embodiment, the position of the rotational axis of the regulating roller 41 is arranged at the axial position (central position) of the cylindrical support surface 11 .

According to the vibration damping device of the second embodiment, the rotating body 2 that rotates while revolving on the supporting surface 11 can be supported by the restricting rollers 41 . As a result, the rotor 2 can be pressed against the support surface 11, and slippage between the rotor 2 and the support surface 11 can be prevented. Since there is a risk that a desired tuning cycle cannot be obtained when slippage occurs, stable vibration damping performance can be expected according to this embodiment. Further, in this embodiment, since the upward movement of the rotating body 2 can be restricted by the restricting roller 41, the rotating body 2 can be prevented from falling off from the supporting body 1 even when the device is moved or when a large impact is applied. There is also the advantage of being able to Furthermore, in the present embodiment, when the revolution angle of the rotating body 2 becomes excessive, the rotating body 2 is configured to abut against the support member 42, thereby preventing the rotating body 2 from falling off from the support body 1. You can also

Other configurations and advantages of the vibration damping device of the second embodiment are basically the same as those of the first embodiment described above, so further detailed description will be omitted.

(Third embodiment)
Next, a vibration damping device according to a third embodiment of the present invention will be described mainly with reference to FIGS. 8 to 11. FIG. The vibration damping device of the third embodiment is a more specific implementation example. In the description of the third embodiment, the same reference numerals are used for elements that are basically common to those of the first and second embodiments described above to avoid duplication of description.

The vibration damping device of the third embodiment further includes an anti-slip portion 5 that reduces relative slippage between the support surface 11 and the rotor 2 . The anti-slip portion 5 has a gear belt 51 attached to the surface of the support surface 11 and a gear belt 52 attached to the surface of the rotating body 2 and meshing with the gear belt 51 (see FIG . 8 ).

The rotating body 2 of this embodiment has a hollow portion 22 having a hollow interior and a storage portion 23 for storing the concentrated load portion 3 therein (see FIGS. 8 and 9). Further, the rotor 2 is made of a relatively lightweight material (for example, wood or synthetic resin).

The concentrated load portion 3 of this embodiment is configured in a cylindrical shape to be housed in the housing portion 23 (see FIG. 11). The concentrated load portion 3 is made of a material having a higher specific gravity than the rotating body 2 (for example, a metal such as steel or copper alloy).

Furthermore, the holding part 4 of the present embodiment further has a guide member 43 that prevents the rotating body 2 from coming off in the end face direction (see FIG. 8). The guide member 43 is fixed to the side surface of the support 1 and is spaced apart from the rotating body 2 so as not to be in contact with the rotating body 2 at all times. When the rotating body 2 is excessively displaced in its axial direction due to an impact or the like, the rotating body 2 is supported by the guide member 43 to prevent the rotating body 2 from falling off.

According to the vibration damping device of this embodiment, since the anti-slip portion 5 is provided, there is an advantage that relative slippage between the support surface 11 and the rotating body 2 can be more reliably suppressed.

Moreover, in this embodiment, there is also an advantage that the guide member 43 can reliably prevent the rotating body 2 from falling off.

Furthermore, in the present embodiment, by providing the hollow portion 22 and the storage portion 23 in the rotor 2 and storing the concentrated load portion 3 in the storage portion, the center of gravity of the rotor 2 can be greatly eccentric.

In addition, in this embodiment, by forming the hollow portion 22 and the like in the rotating body 2, it is possible to obtain a high degree of designability, and there is also the advantage that the appearance of the entire device can be improved.

Other configurations and advantages of the vibration damping device of the third embodiment are basically the same as those of the first and second embodiments described above, so further detailed description will be omitted.

(Fourth embodiment)
Next, a vibration damping device according to a fourth embodiment of the present invention will be described mainly with reference to FIGS. 12 to 14. FIG. The seismic control device of the fourth embodiment is for explaining an example of arranging it in a structure 20 such as a building. In the description of the third embodiment, the same reference numerals are used for elements that are basically common to the elements of the first embodiment described above to avoid duplication of description.

The support 1 of the vibration damping device of this embodiment is arranged on the floor surface 10 of the structure 20 (see FIG. 12). Here, it is preferable that the rotation axis direction of the rotating body 2 is arranged so as to be orthogonal to the vibration direction to be damped. In general, the structure of a structure determines the natural frequency and the magnitude of the amplitude at resonance. Here, the natural frequency and amplitude may differ depending on the direction of the input vibration. A damping device designed to correspond to this natural frequency and expected amplitude can be installed in the structure 20 .

In order to improve the damping action, it is also possible to install a plurality of damping devices on the structure 20 (see FIG. 13).

Moreover, it is also possible to arrange so that the axial direction (rotational axis direction) of the rotating body 2 in the vibration damping device intersects. In the example of FIG. 14, a plurality of vibration damping devices are arranged so that the axial direction (broken line in the figure) of the rotating body 2 is orthogonal. In this way, damping operations can be performed in different directions. In addition, it is possible to arrange vibration control devices on different floors in the same structure, and to change the arrangement directions of these vibration control devices.

Other configurations and advantages of the vibration control device of the fourth embodiment are basically the same as those of the above-described first embodiment, so further detailed description will be omitted.

(Fifth embodiment)
Next, a vibration damping device according to a fifth embodiment of the present invention will be described. This fifth embodiment is for explaining a modification of the above-described second and third embodiments.

In the devices of the second embodiment and the third embodiment, by supporting the rotating body 2 with the regulating rollers 41 of the holding portion 4, slippage between the rotating body 2 and the support surface 11 is prevented.

In contrast, in the fifth embodiment, projections (not shown) are provided on the end faces of the rotating body 2 (including the concentrated stress portions 3) (that is, the end faces at both axial ends of the rotating body 2). Further, on the support 1 (more specifically, at a position facing the end surface of the rotating body 2 that rolls), a guide is formed extending in the direction along the movement trajectory of the projection and accommodates the projection inside. A groove (not shown) is provided. In this embodiment, the holding portion is composed of the projection and the guide groove.

With this configuration, the movement locus of the rotating body 2 rolling on the support surface 11 can be regulated by the guide grooves. 2 can be prevented from falling off. In addition, installation of the regulation roller 1 can be omitted.

For example, in the fifth embodiment, protrusions may be provided on both end surfaces of the concentrated stress portion 3 attached to the rotating body 2, and grooves engaging these protrusions may be formed in the support 1 having an appropriate shape. can. Since the concentrated stress portion 3 is arranged at an eccentric position with respect to the rotating body 2, the locus of movement of the projection accompanying the rolling of the rotating body 2 generally becomes a trochoidal curve or a cycloidal curve. The shape of the movement trajectory can usually be calculated geometrically, and can also be determined experimentally.

The weight of the concentrated stress portion 3 can be increased by forming protrusions on the concentrated stress portion 3 .

Also, a protrusion can be provided at the axial center position of the rotating body 2 . In this case, since the movement trajectory of the protrusion is simplified, the shape of the groove for guiding the protrusion can be simplified, and the manufacturing cost of the device can be suppressed.

It should be noted that it is also possible to position the projections only on one side of the rotating body 2 or the concentrated stress portion 3 if there is a sufficient guiding function. For example, the tip of the protrusion may be provided with a flange that prevents it from falling out of the groove.

Other configurations and advantages of the vibration damping device of the fifth embodiment are basically the same as those of the second and third embodiments described above, so further detailed description will be omitted.

In addition, the contents of the present invention are not limited to the above embodiments. The present invention allows various changes to be made to the specific configuration within the scope of the claims.

For example, in each of the above-described embodiments, the support 1 is installed on the floor, but when attached to a bridge, for example, it can be installed so as to be suspended below the bridge via a structure.

Further, in each of the above-described embodiments, the shape of the support surface 11 is arcuate, but may be, for example, an ellipsoid. Moreover, a polygonal shape may be used when a practically sufficiently low rolling resistance can be obtained.

Furthermore, by devising the curved shape of the support surface 11, a configuration may be adopted in which rolling resistance is given to the rotating body that increases as the rotation angle θ of the rotating body increases. With this configuration, the rotation angle θ of the rotating body can be restricted by the support surface 11 .

Further, in each of the above embodiments, the shape of the support surface 11 is a semi-cylindrical shape with an open top, but it may be a complete cylindrical shape with an open top.

REFERENCE SIGNS LIST 1 support 11 support surface 2 rotating body 21 outer peripheral surface 22 hollow portion 23 storage portion 3 concentrated load portion 4 holding portion 41 regulation roller 42 support member 43 guide member 5 anti-slip portion 51/52 gear belt 10 floor surface 20 structure

Claims (11)

comprising a support, a rotating body, and a concentrated load section,
The support has a substantially concave curved support surface that is downwardly convex,
The rotating body is arranged on and rollable along the supporting surface, whereby the rotating body is passively supported on the supporting surface in response to vibrations of the support. configured to roll along a surface,
A vibration damping device, wherein the concentrated load section is arranged on the rotating body so that the position of the center of gravity of the rotating body is eccentric from the axis of rotation of the rotating body when it rolls. The vibration damping device according to claim 1, wherein the outer peripheral surface of the rotor has a substantially cylindrical surface shape. The vibration damping device according to claim 1 or 2, wherein the support surface of the support has a substantially cylindrical shape. In addition, it has an anti-slip part,
The vibration damping device according to any one of claims 1 to 3, wherein the anti-slip portion is configured to reduce relative slippage between the support surface and the outer peripheral surface of the rotor. The vibration damping device according to claim 4, wherein the anti-slip portion is a gear belt attached to the surface of the support surface and the outer peripheral surface of the rotor. The concentrated load portion is configured to eccentrically move the center of gravity of the rotor upward when the rotor is in a stationary position before rolling, which is a position where the potential energy is lowest in an intermediate portion of the support surface. The vibration damping device according to any one of claims 1 to 5. Furthermore, it has a holding part,
The vibration damping device according to any one of claims 1 to 6, wherein the holding portion is configured to restrict separation of the rotating body from the supporting surface. A vibration control method using the vibration control device according to any one of claims 1 to 7,
A vibration control method, wherein the natural period of the vibration control device corresponds to the primary mode or secondary mode of the natural period of the structure to be controlled. A vibration control method using a plurality of vibration control devices according to any one of claims 1 to 7,
A vibration control method, wherein the plurality of vibration control devices are arranged in a structure such that the rotation axis directions of the rotating bodies are different from each other. A method for damping a structure having a plurality of floors using the damping device according to any one of claims 1 to 7,
The vibration control method, wherein the vibration control devices are respectively installed on different floors of the structure. A structure in which the vibration damping device according to any one of claims 1 to 7 is arranged.

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