Vibration control device

Abstract

To provide a vibration control device capable of effectively reducing vibration of a component of a building caused by environmental vibration and promptly converging vibration of a tuned mass damper when the vibration of the component caused by environmental vibration is converged.SOLUTION: A vibration control device 80 comprises: a tuned mass damper 30; and a damping changeover unit 70 formed of a connection unit 50 and a control unit 60. The connection unit 50 includes: a first connection part 53 connected to the tuned mass damper 30; a second connection part 54 coming into contact with a damping material 58; and connection means 52 for forming a connection posture and a disconnection posture of the connection parts. The control unit 60 stores a vibration threshold value related to a vibration amplitude corresponding to a frequency component specific to vibration of a component 20 caused by environmental vibration, performs frequency analysis of a response acceleration waveform of the component 20, operates the connection means 52 by comparing the frequency component specific to vibration of the component 20 with the vibration amplitude threshold value, and executes damping and non-damping of the vibration of the tuned mass damper 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping device. [Background technology]

[0002] Vibrations (vertical and horizontal vibrations) occur in the structural components of a building (or structure), such as floors, due to disturbances such as environmental vibrations. More specifically, microtremors occur constantly due to so-called environmental vibrations, such as traffic vibrations from trains and other vehicles, vibrations during the operation of factory equipment, vibrations due to wind loads, and even vibrations caused by walking indoors. To reduce the constant microtremor level shaking (acceleration) of such floors, tuned mass dampers (TMDs), which constitute vibration control devices, are sometimes installed on floors and the beams that support the floors.

[0003] Tuned mass dampers are generally designed and configured to provide appropriate damping for robustness, but floor vibration can be minimized by making this damping as close to zero (undamped) as possible. For example, when the frequency of the vibration source, such as facility vibration, is constant among environmental vibrations, a tuned mass damper configured to be nearly undamped is effective.

[0004] However, if the tuned mass damper is set to a nearly non-damped state, the tuned mass damper will continue to vibrate even after environmental vibrations such as walking vibrations have subsided, resulting in an undesirable phenomenon in which the tuned mass damper ends up vibrating the floor. Therefore, to prevent this phenomenon, a vibration control device is ultimately constructed from a tuned mass damper and a damping unit that reduces the vibration of the tuned mass damper, and an appropriate damping amount is set for the tuned mass damper, which makes it impossible to minimize floor vibrations.

[0005] In view of the above, there is a need for a vibration control device equipped with a tuned mass damper and a damping switching unit that can effectively reduce the vibration of building components caused by environmental vibrations, while quickly converging the vibration of the tuned mass damper when the vibration of the components caused by environmental vibrations has subsided.

[0006] Here, Patent Document 1 proposes a floor vibration control device. This vibration control device has a weight attached to a lever supported so that it can vibrate in the vertical direction, the lever or the weight is supported by an elastic support member so that it can vibrate in the vertical direction, a damper is connected to the other end of the lever, and the device is installed on the floor or on a vibration system shared with the floor, the damper is a viscous damper, and the damping force can be adjusted by increasing or decreasing the immersion area of ​​the viscous resistance plate in the viscous material. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 4-171337 Summary of the Invention [Problem to be solved by the invention]

[0008] According to the floor vibration control device described in Patent Document 1, the damping force can be adjusted by increasing or decreasing the viscous material immersion area of ​​the viscous resistance plate immersed in the viscous material damper, but it does not have a means for effectively reducing vibrations of building components caused by environmental vibrations, while quickly converging the vibrations of the tuned mass damper when the vibrations of the components caused by environmental vibrations have subsided.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a vibration control device that can effectively reduce vibrations of building components caused by environmental vibrations, while quickly converging the vibrations of a tuned mass damper when the vibrations of the components caused by environmental vibrations have subsided. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the vibration damping device according to the present invention is A vibration control device comprising a damping switching unit that performs damping and non-damping of vibrations of a tuned mass damper that is installed directly or indirectly on a structural member of a building, the tuned mass damper comprising a base, a spring installed on the base, and a mass supported by the spring, the vibration damping device includes the tuned mass damper, a connection unit, and a control unit, the connection unit and the control unit constituting the damping switching unit; The connection unit is a first connecting portion that connects to the tuned mass damper, a second connecting portion that is not connected to the tuned mass damper and that contacts a damping material, and connecting means that allows the first connecting portion and the second connecting portion to be in a connected position and a disconnected position, The control unit The method further comprises storing frequency components specific to vibrations of the component caused by environmental vibrations and an amplitude threshold for determining whether or not vibrations of the component caused by the environmental vibrations occur in relation to the amplitude of the frequency components, which serve as a guideline for operating the connecting means; acquiring measurement data from a vibration sensor; frequency analyzing the response acceleration waveform of the component based on the measurement data; operating the connecting means when the frequency components specific to vibrations of the component caused by the environmental vibrations become less than the amplitude threshold, thereby forming the connected posture and damping the vibrations of the tuned mass damper; and operating the connecting means when the frequency components specific to vibrations of the component caused by the environmental vibrations become equal to or greater than the amplitude threshold, thereby forming the unconnected posture and not damping the vibrations of the tuned mass damper.

[0011] According to this aspect, the damping switching unit includes a connecting unit and a control unit, and the connecting unit includes a first connecting portion that connects to the tuned mass damper, a second connecting portion that contacts the damping material, and connecting means that forms a connected position and a disconnected position between the first connecting portion and the second connecting portion, and the control unit stores an amplitude threshold that determines the presence or absence of vibration with respect to an amplitude corresponding to a frequency component specific to vibration of the component caused by environmental vibration, and serves as a guide when operating the connecting means, and operates the connecting means when the frequency component specific to vibration of the component caused by environmental vibration becomes less than the amplitude threshold, thereby By having a control unit that forms a connected position to damp the vibration of the tuned mass damper, operates the connecting means when the frequency component specific to the vibration of the component caused by environmental vibration exceeds the acceleration threshold, and forms a disconnected position to not damp the vibration of the tuned mass damper, it is possible to effectively reduce the vertical and horizontal vibration of the component without damping the tuned mass damper when the component of a building is vibrating due to environmental vibration, and when the vibration of the component caused by environmental vibration has subsided, it is possible to damp the tuned mass damper and quickly converge the vibration of the tuned mass damper.

[0012] Here, "building components" include floors and walls (interior partition walls and exterior walls) that make up the building. Furthermore, "tuned mass dampers installed directly or indirectly on building components" includes both configurations in which the tuned mass damper is installed on a building component such as a floor, and configurations in which the tuned mass damper is installed indirectly on the floor, for example, by being installed on a beam supporting the floor. Furthermore, vibration sensors can be installed directly on a floor or other component, or indirectly on a component by being installed on a beam supporting the floor or on the tuned mass damper.

[0013] In another aspect of the vibration damping device according to the present invention, The connecting means is a rotation drive unit that rotates the first connecting portion by pressing a part of the first connecting portion, the first connecting portion being rotatable around a fulcrum provided on the mass; The device is characterized by comprising an electromagnet or a permanent magnet provided on one of the first connecting portion and the second connecting portion and magnetically attracted to the other.

[0014] According to this aspect, the connecting means includes a rotation drive unit that rotates the first connecting unit by pressing a portion of the first connecting unit, which is rotatable around a fulcrum provided on the mass of the tuned mass damper, and an electromagnet or permanent magnet that is provided on one of the first connecting unit and the second connecting unit and magnetically attracted to the other, thereby enabling the first connecting unit and the second connecting unit to be switched smoothly and reliably between the connected position and the disconnected position. In particular, when an electromagnet is used, it is preferable because the first connecting unit and the second connecting unit can be switched even more smoothly between the connected position and the disconnected position by switching between generating and releasing the magnetic force of the electromagnet as needed.

[0015] In another aspect of the vibration damping device according to the present invention, The connecting means is The electromagnet is provided on one of the first connecting portion and the second connecting portion attached to the mass and magnetically attracted to the other.

[0016] According to this aspect, the connecting means is an electromagnet provided on one of the first connecting part and the second connecting part attached to the mass of the tuned mass damper and magnetically attracted to the other, so that the first connecting part and the second connecting part can be smoothly and reliably switched between the connected position and the disconnected position, for example, by moving the first connecting part in the vertical direction.

[0017] Another aspect of the vibration damping device according to the present invention is A container for accommodating the damping material is installed on the mount, and a part of the second connecting portion is accommodated in the container in a position where it is in contact with the damping material.

[0018] According to this aspect, a damping material is housed in a container installed on the frame, and a portion of the second connecting part is housed in the container in a position where it is in contact with the damping material. As a result, the tuned mass damper swaying in the vertical and horizontal directions can be effectively damped by the damping material via the first and second connecting parts in the connected position.

[0019] Another aspect of the vibration damping device according to the present invention is The second connecting portion is characterized in that a flange extending laterally is provided in a region that comes into contact with the damping material.

[0020] According to this aspect, the laterally extending flange provided on the second connecting part, which sways up and down in synchronization with the tuned mass damper swaying up and down, receives great resistance from the damping material, thereby achieving a high damping effect.

[0021] Another aspect of the vibration damping device according to the present invention is One end of a connecting member is rotatably or non-rotatably attached to the stand or to an erecting member erected upward from the stand, and the other end side of the connecting member is supported by the spring, The tuned mass damper is characterized in that it is of a cantilever type configuration, with the mass attached to the connecting member.

[0022] According to this aspect, a cantilever-type vibration control device can be formed that can effectively reduce the shaking of building components when they are shaking due to environmental vibrations, and can quickly converge the shaking of the tuned mass damper when the vibration of the components caused by environmental vibrations subsides.

[0023] Another aspect of the vibration damping device according to the present invention is The present invention is characterized in that it has a flat configuration in which a plurality of the springs are attached to the base and the mass is supported by the plurality of the springs.

[0024] According to this aspect, a flat vibration control device can be formed that can effectively reduce the shaking of building components when they are shaking due to environmental vibrations, and can quickly converge the shaking of the tuned mass damper when the vibration of the components caused by environmental vibrations has subsided.

[0025] Another aspect of the vibration damping device according to the present invention is the component is a floor, The environmental vibration is walking vibration, The frequency components specific to the walking vibration are in the range of 1 to 3 Hz.

[0026] According to this aspect, the frequency components specific to walking vibrations, which are environmental vibrations, are in the range of 1 to 3 Hz, and by setting the amplitude threshold in this frequency band, floor shaking caused by walking vibrations can be effectively reduced.

[0027] Here, the mount is installed directly or indirectly on the beams that support the floor, which are structural members. More specifically, there are two types of mount: one in which the mount is installed directly on the beams, and one in which an installation mount or the like is installed on the beams and a mount that constitutes the attenuation switching unit is installed on the installation mount or the like, thereby indirectly installing the mount on the beams.

[0028] The mounting frame may also be installed on the floor slab of a double floor. By installing the mounting frame on the floor slab of a double floor in this way, the underfloor space of the double floor, such as a free access floor, can be effectively used as an installation space for the tuned mass damper and the damping switching unit, while effectively reducing floor shaking caused by environmental vibrations. [Effects of the Invention]

[0029] As can be understood from the above explanation, the vibration control device of the present invention can effectively reduce vibrations of building components caused by environmental vibrations, while quickly converging the vibrations of the tuned mass damper when the vibrations of the components caused by environmental vibrations have subsided. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is an overall configuration diagram showing a state in which a tuned mass damper constituting a vibration damping device according to an embodiment and a connecting unit of a damping switching unit constituting a vibration damping device are installed on a beam supporting a floor. [Figure 2] 2 is an enlarged view of part II in FIG. 1, showing a state in which an example of a damping switching unit of a vibration damping device according to an embodiment does not reduce the damping of a tuned mass damper. FIG. [Figure 3] 2 is an enlarged view of part II in FIG. 1, showing a state in which an example of a damping switching unit of a vibration damping device according to an embodiment reduces the damping of a tuned mass damper. FIG. [Figure 4] FIG. 2 is a diagram illustrating an example of the hardware configuration of a control unit that forms a damping switching unit of a vibration damping device according to an embodiment. [Figure 5] FIG. 2 is a diagram illustrating an example of the functional configuration of a control unit that forms a damping switching unit of a vibration damping device according to an embodiment. [Figure 6A] FIG. 10 is a diagram showing an example of a waveform of a vibration force on a floor caused by walking vibrations. [Figure 6B] 6B is a diagram showing an example of a response acceleration waveform corresponding to the floor excitation force waveform of FIG. 6A. FIG. [Figure 7] FIG. 10 is a diagram showing an example of the relationship between frequency and amplitude, illustrating frequency components of a floor caused by walking vibrations. [Figure 8] 10A and 10B are diagrams illustrating a state in which another example of a damping switching unit of a vibration damping device according to an embodiment does not reduce the damping of a tuned mass damper. [Figure 9] 10A and 10B are diagrams illustrating a state in which another example of a damping switching unit of a vibration damping device according to an embodiment reduces the damping of a tuned mass damper. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, vibration damping devices according to embodiments will be described with reference to the accompanying drawings. In this specification and the drawings, substantially identical components will be designated by the same reference numerals, and redundant description may be omitted.

[0032] [Vibration damping device according to the embodiment] An example of a vibration damping device according to an embodiment will be described with reference to Figures 1 to 9. Here, Figure 1 is an overall configuration diagram showing a state in which a tuned mass damper constituting the vibration damping device according to an embodiment and a connecting unit of a damping switching unit constituting the vibration damping device are installed on a beam supporting a floor. Also, Figure 2 is an enlarged view of part II in Figure 1, showing a state in which an example of a damping switching unit of the vibration damping device according to an embodiment does not reduce the damping of the tuned mass damper, and Figure 3 is an enlarged view of part II in Figure 1, showing a state in which an example of a damping switching unit of the vibration damping device according to an embodiment reduces the damping of the tuned mass damper.

[0033] The target of vibration reduction by the tuned mass damper 30 shown in Figure 1 is a floor 20 (an example of a structural component) that forms a building, and the floor 20 in the illustrated example is a long concrete floor slab with a span of approximately 15 m between a pair of girders 15. Between the pair of girders 15 are multiple sub-girders 10 that also support the floor 20. Here, the structural component of the building that is the target of vibration reduction may be an exterior wall, an interior wall such as a partition wall, or the like, in addition to the floor in the illustrated example.

[0034] The main girder 15 and the secondary girders 10 are both formed from H-shaped steel (including I-shaped steel) of different dimensions, and an installation frame 18 is placed across the bottom flanges 11 of the two secondary girders 10, which have a lower beam depth than the main girder 15, and a frame 38 on which the tuned mass damper 30 is mounted is installed on the installation frame 18. Therefore, the tuned mass damper 30 in the illustrated example is indirectly installed on the floor 20 via the secondary girders 10. Note that the tuned mass damper 30 may also be installed on the main girder 15 instead of the secondary girders 10.

[0035] The vibration damping device 80 includes a tuned mass damper 30 and a damping switching unit 70 , and the damping switching unit 70 includes a coupling unit 50 and a control unit 60 .

[0036] Below the floor 20, between the two girders 10 supporting the floor 20, are installed the tuned mass damper 30 and (the connecting unit 50 of) the damping switching unit 70 that reduces vibration of the tuned mass damper 30. This installation configuration makes it possible to effectively utilize the space under the floor as installation space for the tuned mass damper 30 and the connecting unit 50. Although not shown, in addition to the illustrated example, there is also another configuration in which the space under a double floor, such as a free access floor, is effectively utilized as installation space for the tuned mass damper and the damping switching unit.

[0037] The tuned mass damper 30 includes a base 38, a plurality of springs 35 installed on the base 38, and a mass 31 supported by the springs 35. In the illustrated example, a vibration sensor 40 is installed on the installation base 18 on which the base 38 is installed, for measuring the vibrations of the floor 20 and the joists 10, which vibrate synchronously in the X1 direction, which is the vertical direction.

[0038] Here, the tuned mass damper 30 shown in the figure is of a so-called flat type in which multiple springs 35 are evenly arranged in a plane on the underside of the mass 31 to support the mass 31, and in the example shown, the mass 31 is supported by two springs 35 on the left and right.However, other types include a so-called cantilever-type tuned mass damper (not shown) in which one end of a connecting member is rotatably attached to the frame, the mass is attached to the connecting member, and the other end of the connecting member is supported by a spring.

[0039] Floor 20 is constantly subject to micro-tremors caused by environmental vibrations, such as traffic vibrations from the movement of vehicles including trains, vibrations during the operation of factory equipment (equipment vibrations), and walking vibrations caused by indoor walking. To reduce the constant micro-tremor level vibrations in the floor, tuned mass dampers 30 are installed, and these micro-tremor level vibrations are constantly measured by vibration sensors 40. Here, an accelerometer, speedometer, displacement meter, etc. is used as vibration sensor 40, and the measurement data can be acceleration data, speed data, displacement data, etc., depending on the type of sensor.

[0040] The damping switching unit 70 that performs damping and undamping of vibrations of the tuned mass damper 30 includes a coupling unit 50 and a control unit 60 .

[0041] The connecting unit 50 is mounted on the platform 38 and a part of it is attached to the mass 31, the specific configuration of which will be described in detail below.

[0042] On the other hand, the control unit 60 is formed by a computer and installed in a location different from the floor 20 and the beams 10, 15. For example, an installation stand may be attached to the beams 10, 15, as with the tuned mass damper 30, and the control unit 60 may be mounted on the installation stand.

[0043] The measurement data measured by the vibration sensor 40 is transmitted to the control unit 60 in the Y1 direction via wireless communication, and the control unit 60, having acquired the measurement data, transmits an operation signal to the connection unit 50 in the Y2 direction to operate the components of the connection unit 50 and perform vibration damping and undamping of the tuned mass damper 30.

[0044] As shown in FIG. 2, the mass 31 is provided with a receiving groove 34 that penetrates from its upper surface 32 to its lower surface 33, and a rotation shaft 37 that crosses the receiving groove 34 in the horizontal direction is provided midway along the receiving groove 34.

[0045] The connecting unit 50 is formed by a first connecting part 53 that is rotatably connected to the rotation axis 37 of the mass 31 of the tuned mass damper 30, a second connecting part 54 that is not connected to the tuned mass damper 30 and has a portion in contact with a damping material 58 contained inside the container 57, and connecting means 52. The connecting means 52 is formed by a rotation drive part 51 and an electromagnet 56 attached to a portion of the first connecting part 53.

[0046] Here, both the first connecting portion 53 and the second connecting portion 54 are made of, for example, iron, and at least the second connecting portion 54 is made of a magnetic material so as to be magnetically attracted to the electromagnet 56 in a magnetic state. Also, the damping material 58 can be made of silicone oil, various greases, or the like.

[0047] The wall surface of the accommodation groove 34 and a part of the first connecting part 53 above the rotation shaft 37 are connected via a biasing spring 51b. The rotation drive part 51 is formed by a cylinder mechanism, and when the piston rod 51a forming the cylinder mechanism is contracted, the first connecting part 53 is biased by the biasing spring 51b toward the rotation drive part 51, and rotates and tilts in the X4 direction, as shown in FIG.

[0048] An electromagnet 56 is attached to the end of the first connecting portion 53 on the second connecting portion 54 side, and by rotating the first connecting portion 53, the electromagnet 56 can freely move in the X5 direction, toward or away from the second connecting portion 54. In Figure 2, the electromagnet 56 is in a state separated from the second connecting portion 54.

[0049] For example, when the electromagnet 56 approaches the second connecting portion 54, a current is applied to the coil forming the electromagnet 56, generating a magnetic force, and the electromagnet 56 in a magnetically attracted state is magnetically attracted to the second connecting portion 54, thereby forming a connected posture between the first connecting portion 53 and the second connecting portion 54.

[0050] On the other hand, when the first connecting portion 53 and the second connecting portion 54 are released from the connected position to form the unconnected position, the application of current to the electromagnet 56 is stopped, and the magnetic force disappears, thereby smoothly forming the unconnected position.

[0051] In this manner, the operation of the cylinder mechanism 51 and the coordinated operation of the electromagnet 56 are controlled by the control unit 60.

[0052] Here, a permanent magnet may be used instead of the electromagnet 56, but since the magnetic force of a permanent magnet does not disappear, it is preferable to use the electromagnet 56 because it is inferior to the electromagnet 56 in terms of smoothness of changing the position of the first connecting part 53 and the second connecting part 54 from the connected position to the disconnected position. Note that although the connecting means 52 in the illustrated example is composed of the cylinder mechanism 51 and the electromagnet 56, the connecting means may also be a mechanical connecting means (not shown) using an air gripper, gears, or the like.

[0053] In the disconnected position of the first connecting part 53 and the second connecting part 54 shown in Figure 2, when the floor 20 (see Figure 1) vibrates due to environmental vibrations and the mass 31 vibrates in the vertical direction X2 to damp the vibration of the floor 20, the vibration of the mass 31 is no longer damped by the damping material 58, and the vertical vibration of the floor 20 can be effectively reduced by the tuned mass damper 30.

[0054] On the other hand, when the vertical vibration of floor 20 caused by environmental vibration has subsided, as shown in Figure 3, cylinder mechanism 51 is operated to extend piston rod 51a in the X3' direction, the tip of piston rod 51a pushes first connecting part 53, and first connecting part 53 is rotated in the X4' direction against the biasing force of biasing spring 51b, and electromagnet 56 in a magnetic state is magnetically attracted to part of second connecting part 54 in the X5' direction, thereby forming a connected posture between first connecting part 53 and second connecting part 54.

[0055] Since the first connecting part 53 fixed to the mass 31 is connected to the second connecting part 54, when the mass 31 vibrates in the vertical direction X2, the vibration of the second connecting part 54, a part of which is housed inside the damping material 58, in the vertical direction X6 is damped by the damping material 58.

[0056] Here, a flange 55 extending in the horizontal direction is provided at the lower end of the second connecting portion 54 (an example of an area that comes into contact with the damping material 58).

[0057] The flange 55 vibrates vertically together with the second connecting portion 54 inside the damping material 58, and when it moves downward, an upward pushing distributed load p2 acts from the damping material 58 on the underside of the flange 55, and when it moves upward, a downward pushing distributed load p1 acts from the damping material 58 on the top surface of the flange 55.As a result, the viscous resistance of the damping material 58 is increased via the flange 55, and the vertical vibration of the second connecting portion 54 is quickly damped.

[0058] The rapid damping of the vibration of the second connecting portion 54 leads to rapid damping of the vertical vibration of the mass 31 connected to the second connecting portion 54 via the first connecting portion 53 and the cylinder mechanism 51.

[0059] Next, with reference to Figures 4 and 5, an example of the hardware configuration and functional configuration of the control unit 60 that forms the damping switching unit 70 will be described. Furthermore, with reference to Figures 6 and 7, an amplitude threshold that determines the presence or absence of environmental vibration and that regulates the operation of the connecting means will be described. Here, Figure 4 is a diagram showing an example of the hardware configuration of a control unit that forms the damping switching unit of a vibration damping device according to an embodiment, and Figure 5 is a diagram showing an example of the functional configuration of a control unit that forms the damping switching unit of a vibration damping device according to an embodiment. Furthermore, Figure 6A is a diagram showing an example of a floor excitation force waveform caused by walking vibration, and Figure 6B is a diagram showing an example of a response acceleration waveform corresponding to the floor excitation force waveform of Figure 6A. Furthermore, Figure 7 is a diagram showing an example of the relationship between frequency and amplitude, showing the floor frequency components caused by walking vibration.

[0060] The control unit 60 is configured by an information processing device (computer) such as a relatively small controller, and has a size that allows it to be placed on a stand spanning two small beams B, for example, as described above.

[0061] The controller constituting the control unit 60 includes a CPU (Central Processing Unit) 61, a main memory device 62, an auxiliary memory device 63, a communication IF (interface) 64, and an input / output IF 65, which are interconnected by a connection bus 66. The main memory device 62 and the auxiliary memory device 63 are computer-readable recording media.

[0062] The CPU 61 is a central processing unit that performs overall control of the control unit 60, which is made up of a computer.

[0063] The main storage device 62 stores computer programs executed by the CPU 61, data processed by the CPU 61, etc. The main storage device 62 includes, for example, a flash memory, a RAM (Random Access Memory), and a ROM (Read Only Memory).

[0064] The auxiliary storage device 63 is used, for example, as a storage area that assists the main storage device 62, and stores computer programs executed by the CPU 61, data processed by the CPU 61, and the like.

[0065] The input / output IF 65 is an interface for inputting and outputting data to and from devices connected to the control unit 60 .

[0066] The communication IF 64 is an interface with a network to which the control unit 60 is connected. The communication IF 64 receives measurement data from the vibration sensor 40 via various networks including a public network such as the Internet, and transmits command signals to the electromagnet 56 and the cylinder mechanism 51.

[0067] As shown in FIG. 5, the control unit 60 provides various functions of at least an acquisition unit 102, a calculation unit 104, an operation unit 106, a display unit 108, and a storage unit 110 by the execution of a program by a CPU 61.

[0068] The acquisition unit 102 acquires measurement data transmitted from the vibration sensor 40, which measures micro-movements of the floor 20 caused by disturbances at any time, and stores the data in the storage unit 110 each time.

[0069] For example, when the environmental vibration is walking vibration, measurement data relating to a floor vibration waveform such as that shown in FIG. 6A is acquired.

[0070] In Figure 6B, the dotted line shows the response acceleration without a vibration damping device, and the solid line shows the response acceleration without a damping switching unit and in a configuration in which the natural frequency of the tuned mass damper is controlled to match the dominant frequency of floor vibration (configuration with a vibration damping device).

[0071] As shown in Figure 6B, after walking has stopped, the floor shaking becomes larger due to the effect of the tuned mass damper than when walking, so the presence or absence of walking cannot be precisely detected based on the magnitude of acceleration based on the measurement data.

[0072] The storage unit 110 stores an amplitude threshold value, which is the amplitude of a frequency component and serves as a guide when operating the cylinder mechanism 51, for determining whether or not vibration of the floor 20 is caused by environmental vibration. For example, if the environmental vibration is walking vibration, a predetermined amplitude threshold value in the range of 1 to 3 Hz is stored as a frequency component specific to vibration of the floor 20 caused by walking vibration.

[0073] The calculation unit 104 performs frequency analysis on the response acceleration waveform of the floor 20, for example, based on the measurement data acquired from the vibration sensor 40, and obtains the amplitude for each frequency.

[0074] As shown in Figure 7, the natural frequency of the floor (the frequency at which the floor resonates and the shaking increases) is generally 5 Hz or higher, and in the example shown it is 8 Hz. Figure 7 shows that there is residual shaking even after walking has finished, and the amplitude is relatively large.

[0075] On the other hand, since the dominant frequency of vibrations of floor 20 caused by walking is 1 to 3 Hz, an amplitude threshold is set for the amplitude in this frequency band. In the illustrated example, the amplitude of 2 Hz in the frequency band of 1 to 3 Hz is slightly large when walking, but there is almost no amplitude after walking stops.

[0076] Therefore, in the frequency band of 1 to 3 Hz, the amplitude of 2 Hz in the illustrated example, or an amplitude close to this, or an amplitude close to zero, or no amplitude (zero), etc. is set as the amplitude threshold and stored in the storage unit 110.

[0077] The calculation unit 104 performs frequency analysis on the response acceleration waveform of the floor 20 each time based on the measurement data transmitted at any time, and transmits to the operation unit 106 a judgment signal indicating whether the amplitude of 1 to 3 Hz, which is a frequency component specific to floor vibration, is less than the amplitude threshold value or greater than the amplitude threshold value.

[0078] Here, when the amplitude of the frequency component specific to the floor vibration is equal to or greater than the amplitude threshold, it is necessary to damp the vibration of the floor 20, and therefore the vibration of the mass 31 of the tuned mass damper 30, which vibrates to damp the vibration of the floor 20, is not damped.

[0079] In order to prevent the vibration of the mass 31 from being damped, the operating unit 106 sends a command signal to the electromagnet 56 to apply no current and to prevent magnetic force from being generated, and further sends a command signal to the cylinder mechanism 51 to retract the piston rod 51a so as to move the first connecting portion 53 away from the second connecting portion 54, thereby forming a disconnected position between the first connecting portion 53 and the second connecting portion 54 as shown in Figure 2.

[0080] Since the first connecting portion 53 and the second connecting portion 54 are not connected, the vibration of the mass 31 is no longer damped by the damping material 58, and it becomes possible for the vibration of the mass 31 to damp the vibration of the floor 20.

[0081] On the other hand, when the amplitude of the frequency component specific to the floor vibration falls below the amplitude threshold, a signal to that effect is sent to the operation unit 106 .

[0082] Here, when the amplitude of the frequency component specific to the floor vibration is below the amplitude threshold, the vibration of floor 20 has subsided, and therefore it is necessary to damp the vibration of mass 31 of tuned mass damper 30, which is vibrating, in order to damp the vibration of floor 20. This is to prevent a situation in which mass 31 continues to vibrate even though the vibration of floor 20 has subsided, preventing the vibration of floor 20 from converging due to the vibration of mass 31.

[0083] In order to damp the vibration of the mass 31, the operating unit 106 transmits a command signal to the electromagnet 56 to apply an electric current to generate a magnetic force, and further transmits a command signal to the cylinder mechanism 51 to extend the piston rod 51a so as to push the first connecting portion 53, thereby forming a connected posture between the first connecting portion 53 and the second connecting portion 54 via the electromagnet 56.

[0084] By forming the connected posture of the first connecting portion 53 and the second connecting portion 54, the vibration of the second connecting portion 54 is damped by the damping material 58, as shown in Figure 3, and in response to this, the vibration of the mass 31 is damped.

[0085] The display unit 108 displays the measurement data from the vibration sensor 40, which changes from moment to moment, and also displays the results of frequency analysis based on the measurement data, and displays, for example, that the amplitude of the frequency component specific to the vibration of the floor 20 is below the amplitude threshold, or that it is above the amplitude threshold and the vibration is being damped by the tuned mass damper 30.

[0086] In this way, the connecting unit 50 includes the first connecting portion 53 that connects to the tuned mass damper 30, the second connecting portion 54 that contacts the damping material 58, and the connecting means 52 that forms the connected posture and the disconnected posture between the first connecting portion 53 and the second connecting portion 54. The connecting unit 50 stores an amplitude threshold value for the frequency component specific to the vibration of the floor 20, which serves as a guide when operating the connecting means 52, and operates the connecting means 52 when the amplitude of the frequency component specific to the vibration of the floor calculated by the calculation unit 104 becomes less than the amplitude threshold value. By having a control unit 60 that operates the connecting means 52 to damp the vibration of the tuned mass damper 30 when the amplitude exceeds the amplitude threshold, and then operates the connecting means 52 to form a disconnected position so that the vibration of the tuned mass damper 30 is not damped, it is possible to effectively reduce the vertical shaking of the floor 20 without damping the tuned mass damper 30 when the floor 20 is shaking due to walking vibration, and when the vibration of the floor 20 caused by walking vibration has subsided, it is possible to damp the tuned mass damper 30 and quickly converge the shaking of the tuned mass damper 30.

[0087] Next, another example of a damping switching unit of a vibration damping device according to an embodiment will be described with reference to Fig. 8 and Fig. 9. Here, Fig. 8 is a diagram showing a state in which the other example of a damping switching unit of a vibration damping device according to an embodiment does not reduce the damping of the tuned mass damper, and Fig. 9 is a diagram showing a state in which the other example of a damping switching unit of a vibration damping device according to an embodiment reduces the damping of the tuned mass damper.

[0088] The damping switching unit in the illustrated example differs from the damping switching unit 70 having the connecting unit 50 in that, in its component connecting unit 50A, a cylinder mechanism 51A is built into the mass 31, the piston rod 51c of the cylinder mechanism 51A is the first connecting part, an electromagnet 56 is attached to the end of the piston rod 51c, and by sliding the piston rod 51c in the X7 direction, which is the up and down direction, the connected position of the first connecting part 51c and the second connecting part 54 shown in Figure 9 and the disconnected position shown in Figure 8 are formed.

[0089] The damping switching unit including the connecting unit 50A also provides the same effects as those of the damping switching unit 70 including the connecting unit 50.

[0090] It should be noted that the configurations of the above-described embodiments may be combined with other components, and the present invention is not limited to the configurations shown here. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined depending on the application form. [Explanation of symbols]

[0091] 10: Beam (small beam) 11: Lower flange 15: Liang (large beam) 18: Installation stand 20: Floor (concrete floor slab, components) 30: Tuned mass damper 31: Trout 32:Top surface 33: Bottom surface 34: Storage groove 35: Spring 37: Rotating axis 38: Stand 40: Vibration sensor 50, 50A: Connecting unit 51: Rotation drive unit (cylinder mechanism) 51A: Cylinder mechanism 51a: Piston rod 51b: biasing spring 51c: Piston rod (first connecting part) 52,52A: Connection means 53: 1st connection part 54:Second connection part 55: Flange 56: Electromagnet 57: Container 58: Damping material 60: Control unit 70: Attenuation switching unit 80: Vibration control device

Claims

1. A vibration control device comprising a damping switching unit that performs damping and non-damping of vibrations of a tuned mass damper that is installed directly or indirectly on a structural member of a building, the tuned mass damper comprising a base, a spring installed on the base, and a mass supported by the spring, the vibration damping device includes the tuned mass damper, a connection unit, and a control unit, the connection unit and the control unit constituting the damping switching unit; The connecting unit is a first connecting portion that connects to the tuned mass damper, a second connecting portion that is not connected to the tuned mass damper and that contacts a damping material, and connecting means that allows the first connecting portion and the second connecting portion to be in a connected position and a disconnected position, The control unit a vibration damping device that stores frequency components specific to vibrations of a component caused by environmental vibrations and an amplitude threshold value for determining whether or not vibrations of the component caused by the environmental vibrations occur in relation to the amplitude of the frequency components, which serve as a guideline for operating the connecting means; acquires measurement data from a vibration sensor; performs frequency analysis of the response acceleration waveform of the component based on the measurement data; operates the connecting means when the frequency components specific to vibrations of the component caused by the environmental vibrations become less than the amplitude threshold value, thereby achieving the connected posture and damping the vibrations of the tuned mass damper; and operates the connecting means when the frequency components specific to vibrations of the component caused by the environmental vibrations become equal to or greater than the amplitude threshold value, thereby achieving the unconnected posture and not damping the vibrations of the tuned mass damper.

2. The connecting means is a rotation drive unit that rotates the first connecting portion by pressing a part of the first connecting portion, the first connecting portion being rotatable around a fulcrum provided on the mass; 2. The vibration damping device according to claim 1, further comprising an electromagnet or a permanent magnet provided on one of the first connecting portion and the second connecting portion and magnetically attracted to the other.

3. The connecting means is 2. The vibration damping device according to claim 1, wherein an electromagnet is provided on one of the first connecting portion and the second connecting portion attached to the mass and magnetically attracted to the other.

4. 4. The vibration damping device according to claim 2, wherein a container for accommodating the damping material is installed on the frame, and a portion of the second connecting portion is accommodated in the container in a position where it is in contact with the damping material.

5. 5. The vibration damping device according to claim 4, wherein a flange extending in a lateral direction is provided in a region of the second connecting portion that comes into contact with the damping material.

6. One end of a connecting member is rotatably or non-rotatably attached to the stand or to an erecting member erected upward from the stand, and the other end side of the connecting member is supported by the spring, 2. The vibration damping device according to claim 1, wherein the tuned mass damper is of a cantilever type, with the mass attached to the connecting member.

7. 2. The vibration damping device according to claim 1, wherein the vibration damping device is of a flat type, in which a plurality of the springs are attached to the mount and the mass is supported by the plurality of the springs.

8. the component is a floor, The environmental vibration is walking vibration, 2. The vibration damping device according to claim 1, wherein the frequency component specific to the walking vibration is in the range of 1 to 3 Hz.

Images