JP5015647B2 - Vibration control device - Google Patents

Description

  The present invention relates to a vibration damping device that controls vibration of a structure.

  Vibration occurs when a large number of spectators perform a jumping movement in concert with music in a live house or multipurpose hall, or when a press machine or the like continuously operates in a factory. This vibration propagates to buildings around the building via the foundation and the ground, induces vertical vibrations, and is felt as an unpleasant vibration.

  In order to eliminate this unpleasant vibration, there is one in which a vibration control device that forcibly generates vibration to cancel the vibration is provided in a building around the vibration generation source (for example, see Patent Document 1). .

  The vibration damping device of Patent Document 1 is propagated from an adjacent factory to the building by providing an active vibration damping device that generates a vibration damping force in the vertical direction based on vibration information measured by a vibration sensor installed in the building. The vibration is controlled.

However, since the damping device of Patent Document 1 does not damping the vibration of the vibration generating source, the damping device has to be provided in all the buildings around the vibration generating source.
JP-A-8-53954

The present invention aims to obtain a vibration damping device for damping the vibrations transmitted to the surrounding buildings from the building as a vibration generating source.

Vibration damping device according to claim 1 of the present invention is provided in a building, a measuring means for measuring the frequency and amplitude of the buildings generated in the vertical direction, provided on the pillar of the building, the vibration of the building Damping means for generating a damping force in the vertical direction to cancel, and control means for controlling the magnitude of the damping force based on the vibration frequency and amplitude of the building measured by the measuring means. It is a feature.

According to the above configuration, when a vertical vibration is generated in the building due to a person jumping in a group, the vibration is transmitted to the column . At this time, the frequency and amplitude in the vertical direction are measured by the measuring means.

  Subsequently, the control means controls the magnitude of the damping force of the damping means based on the vibration frequency and amplitude measured by the measuring means.

As a result, the vertical vibration of the building that is the source of vibration is concentrated on the pillar, and the vibration is canceled by itself, so that the vibration is not transmitted to the surrounding buildings through the ground.

The vibration damping device according to claim 2 of the present invention is characterized in that the vibration damping means is provided with a vibration part that can vibrate in the vertical direction, and a rigidity variable that is provided between the vibration part and the column so that the rigidity can be changed. And the control means vibrates the excitation unit based on the amplitude, and changes the rigidity of the rigidity variable means based on the frequency.

According to the above configuration, when canceling the vibration of the building, the amplitude is adjusted by the vibration of the excitation unit, and the frequency is adjusted by changing the stiffness of the stiffness varying means. Can be controlled.

The vibration damping device according to claim 3 of the present invention is characterized in that the rigidity varying means is provided on a ceiling wall and a bottom wall of a housing portion of the vibration portion formed on the column .

  According to the above configuration, since the stiffness variable means is on the ceiling wall and the bottom wall of the housing portion of the vibration portion and supports the vibration portion, the vibration portion moves either upward or downward. Damping force is also generated.

  Thereby, even if the vibration means is small, it is possible to amplify the vibration damping force.

  A vibration damping device according to a fourth aspect of the present invention is characterized in that auxiliary members having inherent rigidity are provided on the ceiling wall and the bottom wall.

  According to the above configuration, the auxiliary member having inherent rigidity is provided between the excitation wall and the ceiling wall and the bottom wall of the housing unit, and the auxiliary member supports the excitation unit with inherent rigidity. The vibration of the excitation unit is stabilized and the damping force is stabilized.

  In addition, since the burden on the stiffness variable means portion is reduced, the design can be made compact.

  Since the present invention has the above-described configuration, vibrations are not easily transmitted from the structure serving as the vibration generation source to the surrounding structures.

  An embodiment of a vibration damping device of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a building 10 is constructed on the ground 20.

  The building 10 is constructed by forming a pile 12 made of concrete or the like in the vertical direction of the ground 22 and assembling and fixing a plurality of columns 14 and a plurality of beams 16 made of H steel on the pile 12. . The building 10 has a hall 24 for accommodating a large number of people on the top floor.

  A vibration damping device 100 that generates vibration (arrow B) that cancels vibration (arrow A) generated at the floor 18 of the hole 24 is included in the central portion 14B of the plurality of pillars 14A immediately below the hole 24.

  A vibration sensor 26 that measures the amplitude and frequency of vibration generated in the hall 24 is provided on the floor 18 of the hall 24.

  A control device 30 that controls the vibration of the vibration damping device 100 is provided on the lower floor of the hall 24 based on the amplitude and frequency of vibration measured by the vibration sensor 26. The control device 30 and the vibration sensor 26 are connected by an energizable cable 28, and the control device 30 and the vibration damping device 100 are similarly connected by an energizable cable 32.

  The control device 30 includes a power source (not shown), and can be supplied to the outside by the control device 30 driving the power source.

  As shown in FIG. 2a, a ceiling wall 104 and a bottom wall 106 made of a steel plate and extending horizontally are welded between the flanges of the central portion 14B, and the ceiling wall 104 and the both sides of the web of the central portion 14B are welded. An accommodating portion 107A and an accommodating portion 107B surrounded by the bottom wall 106 are formed.

  The damping device 100 is housed in each of the housing portion 107A and the housing portion 107B. In addition, since the damping device 100 in the accommodating portion 107A and the accommodating portion 107B has the same configuration, the description of the damping device 100 in the accommodating portion 107B is omitted.

  Next, the vibration damping device 100 will be described.

  2A and 2B, the vibration damping device 100 includes a vibration unit 108 that generates vibrations, and vibrations that are transmitted to the ceiling wall 104 and the bottom wall 106 by adjusting the frequency generated by the vibration unit 108. It is comprised with the adjustment part 110. FIG.

  The vibration unit 108 includes a column 120 formed by standing two channel steels facing each other on a bottom plate 118, two auxiliary columns 126 erected on both sides of the column 120, and a hollow cylindrical column. The movable part 122 extrapolated by 120 and the top plate 116 supported by the column 120 and the auxiliary column 126 are provided.

  A support member 128 of the movable portion 122 is positioned at the center of the support column 120 so as to be movable in the vertical direction. A gap 121 is formed between the movable part 122 and the support member 128. Further, a plurality of magnets 142 are fixed in a vertical direction on the inner side (web) of the channel steel constituting the support column 120.

  An electromagnetic coil 130 is fixed at the center of the support member 128. The electromagnetic coil 130 is wound around a core metal (not shown) around the coil. Thereby, the electromagnetic coil 130 and the movable part 122 are integrated, and can move along the outer peripheral surface of the column 120.

  One end of a cable 132 that can be energized is connected to the electromagnetic coil 130. The other end of the cable 132 is connected to the above-described cable 32 (see FIG. 1), and the electromagnetic coil 130 and the control device 30 are connected via the cable 32 and the cable 132.

  A weight 124 made of a steel plate is fixed to one end face of the movable portion 122 so as to be replaceable by fixing means such as a bolt and a nut (not shown). By changing the weight of the weight 124, the weight of the movable portion 122 can be changed.

  Here, when the electromagnetic coil 130 is energized from the control device 30, a magnetic field is generated around the electromagnetic coil 130, and the movable part 122 moves along the support column 120 by the repulsive force between the magnetic field and the magnetic field of the magnet 142 described above. Moving. The moving direction of the movable part 122 changes depending on the energization direction to the electromagnetic coil 130, and the movable part 122 moves in the vertical direction (arrow F direction) when the control device 30 appropriately changes the energization direction. . Due to the vertical movement of the movable part 122, the vibration part 108 vibrates.

  On the other hand, the vibration adjustment unit 110 includes a spring 112 having a predetermined spring constant (inherent rigidity) and an air spring 114 whose rigidity changes depending on the pressure of the injected air.

  One end of the spring 112 and the air spring 114 is fixed to the ceiling wall 104 or the bottom wall 106, and the other end is fixed to the top plate 116 or the bottom plate 118.

  As shown in FIG. 3a, one end of a pipe 152 is connected to the air spring 114, and the other end of the pipe 152 is connected to an air supply means such as an air cylinder or a compressor (not shown). A switching valve 150 that closes or opens the pipe 152 is provided in the middle of the path of the pipe 152. The air supply means and the switching valve 150 are driven and controlled by the control device 30 described above.

  Here, when air is supplied (arrow G) to the air spring 114 by the above-described air supply means, or the supply is stopped, the spring constant of the air spring 114 changes. As a result, the rigidity of the vibration adjusting unit 110 is changed, and the frequency generated in the above-described exciting unit 108 (see FIG. 2) is made variable.

  In this embodiment, the air spring 114 is used for the vibration adjustment unit 110. However, as another means for changing the rigidity (changing the spring constant), for example, as shown in FIG. A configuration for changing the distance can be used.

  As shown in FIG. 3 b, a support member 154 is provided on the above-described top plate 116, and the center portion of the leaf spring 156 is fixed to the upper end portion of the support member 154.

  On the other hand, a ceiling wall 160 on which a pair of support plates 158 are slidably provided is provided at a position facing the leaf spring 156. The support plate 158 has an opening (not shown) through which the plate spring 156 can be inserted.

  Here, the opening of the support plate 158 is extrapolated to both ends of the plate spring 156, whereby the plate spring 156 is supported using the support plate 158 as a fulcrum.

  The rigidity of the leaf spring 156 can be changed by sliding the support plate 158 in the direction of the arrow K and changing the distance between the pair of support plates 158 (distance between fulcrums).

  Next, the operation of the embodiment of the present invention will be described.

  As shown in FIGS. 1 and 2, when a concert or the like is performed in the hall 24 and a person jumps in a group in accordance with the rhythm of the sound, the floor portion 18 of the building 10 vibrates in the vertical direction. The vibration wave A (amplitude a, period T1, frequency 1 / T1) generated in the floor 18 is concentrated and propagated on the column 14A.

  The vibration sensor 26 measures the amplitude a of the vibration wave A, the period T1, and the vibration frequency 1 / T1, and transmits data to the control device 30.

  Subsequently, the control device 30 energizes the electromagnetic coil 132 so as to generate a vibration of a vibration wave B (amplitude a, vibration frequency 1 / T1) that is shifted from the vibration wave A by ½ period, and the excitation unit 108. Vibrates. The vibration of the excitation unit 108 is adjusted in frequency by the rigidity of the spring 112 and the air spring 114.

  Since the vibration wave A propagated to the column 14A is generated by the excitation unit 108 and is canceled by the vibration suppression force of the vibration wave B adjusted by the vibration adjustment unit 110, the vibration propagates downward from the vibration suppression unit 14B. Disappears. When weak vibration is measured by the vibration sensor 26, the control device 30 adjusts the energization to the electromagnetic coil 130 and the air pressure of the air spring 114 to appropriately perform feedback control, so that the vibration wave A is generated. Damped.

  Next, vibration suppression when the vibration frequency and amplitude of the vibration wave in the hole 24 change will be described.

  As shown in FIGS. 1 and 4, in the hall 24, for example, a concert is performed, and a group of people jumps in time with the first song, and the vibration wave for canceling the vibration wave generated at that time is shown in the graph C ( Amplitude b, period T2, frequency 1 / T2).

  Here, the first song is finished, the second song is started, and the group of people jumps to the song again, and the vibration wave of graph A (amplitude a, period T1, frequency 1 / T1) Suppose that occurs.

  Based on the data (amplitude a, period T1, frequency 1 / T1) transmitted from the vibration sensor 26, the control device 30 changes the energization amount and energization direction to the electromagnetic coil 130 (see FIG. 2b), The amplitude of the vibration wave of graph C is adjusted from b to a (arrow Y) while being shifted from the vibration wave of A by ½ period.

  Further, the control device 30 adjusts the air pressure of the air spring 114 to change the rigidity, and adjusts the frequency of the vibration wave of the graph C from 1 / T2 to 1 / T1 (arrow X).

  In this way, the vibration wave of graph B (amplitude a, frequency 1 / T1, period T1 / 2 delay) is generated in the excitation unit 108, and the vibration wave of graph A is generated by the damping force of the vibration wave of graph B. Will be countered.

  As described above, the building 10 which is a vibration generation source cancels the vibration by the pillar 14 where the vibration in the vertical direction concentrates, so that the vibration is not transmitted to the surrounding buildings through the ground 22.

  Further, when canceling the vibration (vibration wave) generated in the building 10, the amplitude is adjusted by the vibration of the excitation unit 108, and the frequency is adjusted by changing the stiffness of the air spring 114. Can control the magnitude of damping force.

  Further, since the air spring 114 is located on the ceiling wall 104 and the bottom wall 106 of the housing portions 107A and 107B of the vibration portion 108, the vibration damping force can be applied regardless of whether the vibration portion 108 moves upward or downward. appear. As a result, even if the excitation unit 108 is small, the damping force can be amplified.

  In addition, a spring 112 having inherent rigidity is provided on the ceiling wall 104 and the bottom wall 106 of the accommodating portions 107A and 107B of the excitation unit 108, and the spring 112 supports the excitation unit 108 with inherent rigidity. The vibration of the excitation unit 108 is stabilized, and the damping force is stabilized.

  Further, since the burden on the air spring 114 is reduced, the design can be made compact.

  In addition, this invention is not limited to said embodiment.

  The vibration sensor 26 may be provided anywhere as long as it is at the pillar 14.

  The vibration exciter 100 may be provided on the upper or upper end of the pile 12 according to the structure of the building 10.

  The vibration unit 108 may be provided in either one of the housing units 107A and 107B.

  The vibration adjustment unit 110 may be configured by air springs 114 at all three locations.

  The number of springs 112 and air springs 114 may be either a single number or a plurality.

1 is an overall view of a building provided with a vibration damping device according to an embodiment of the present invention. (A) It is a perspective view of the damping device concerning the embodiment of the present invention. (B) It is sectional drawing of the damping device which concerns on embodiment of this invention. (A) It is a schematic diagram which shows the air spring which concerns on embodiment of this invention. (B) It is the schematic diagram which showed the other Example of the vibration adjustment part which concerns on embodiment of this invention. It is the schematic diagram which showed the damping method by the damping device which concerns on embodiment of this invention using the vibration wave.

Explanation of symbols

10 Building (structure)
12 Pile
14 pillars
26 Vibration sensor (measuring means)
30 Control device (control means)
100 Damping device (damping device)
104 Ceiling wall (ceiling wall)
106 Bottom wall (bottom wall)
107A housing part (housing part)
107B housing part (housing part)
108 Excitation unit (vibration control means, excitation unit)
110 Vibration adjustment unit (vibration control means, stiffness variable means)
112 Spring (auxiliary member)
114 Air spring (vibration control means, rigidity variable means)

Claims (4)

Provided in a building, a measuring means for measuring the frequency and amplitude of the building to be generated in the vertical direction,
A damping means provided on the pillar of the building and generating a damping force in the vertical direction to cancel the vibration of the building ;
Control means for controlling the magnitude of the damping force based on the frequency and amplitude of the building measured by the measuring means;
A vibration damping device comprising: The vibration damping means has a vibration part that can vibrate in the vertical direction, and a rigidity variable means that is provided between the vibration part and the column and that can change rigidity.
2. The vibration damping device according to claim 1, wherein the control unit vibrates the excitation unit based on the amplitude and changes the stiffness of the stiffness varying unit based on the frequency. 3. The vibration damping device according to claim 2, wherein the rigidity varying means is provided on a ceiling wall and a bottom wall of a housing portion of the vibration portion formed on the pillar .   The vibration damping device according to claim 3, wherein auxiliary members having inherent rigidity are provided on the ceiling wall and the bottom wall.

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