JP5959324B2 - Vibration control device - Google Patents

Description

  The present invention relates to a vibration control device.

  2. Description of the Related Art There is known a structure vibration control device that includes a laminated piezoelectric element that is disposed between a vibration suppression target structure and a fixed foundation and functions as an active vibration control actuator (for example, Patent Document 1).

JP 2002-070933 A

  However, in the technique disclosed in Patent Document 1, since the multilayer piezoelectric element is arranged between the structure to be damped and the fixed base, it takes time to attach the multilayer piezoelectric element.

  An object of the present invention is to obtain a vibration control device that can reduce the labor of mounting a piezoelectric element in consideration of the above facts.

Vibration control apparatus according to claim 1 is mounted on a tension member tensile force with provided in the vibration control object is introduced, and a vibration control piezoelectric element expanding and contracting the cited stretched member in the direction of introduction of the pulling force A vibration detection sensor for detecting vibration of the vibration control object; and, based on the output of the vibration detection sensor, the tension material is expanded and contracted on the vibration control piezoelectric element to control the vibration of the vibration control object. And a vibration control unit.

According to the vibration control device of the first aspect, the vibration control unit expands and contracts the tensile material on the vibration control piezoelectric element based on the output of the vibration detection sensor that detects the vibration of the vibration control object. At this time, the piezoelectric element for vibration control expands and contracts the tensile material in the direction in which the tensile force is introduced. Thereby, the vibration of the vibration control object is controlled. Therefore, the vibration of the vibration control object can be reduced.

  Further, in the present invention, since the vibration control piezoelectric element is attached to the tensile material provided on the vibration control object, the labor for attaching the vibration control piezoelectric element can be reduced.

Vibration control apparatus according to claim 2 is attached to a tension member tensile force with provided in the vibration control object is introduced, the pulling force by the stretching of the tension member due to vibration of the vibration control object A vibration detecting piezoelectric element that expands and contracts in the introduction direction; and a vibration property analyzing unit that analyzes a vibration property of the vibration control object based on a piezoelectric signal of the vibration detecting piezoelectric element.

  According to the vibration control device of the second aspect, the vibration analysis unit analyzes the vibration property of the vibration control object based on the piezoelectric signal of the vibration detecting piezoelectric element.

  Here, the vibration property of the vibration control object changes due to damage or deterioration over time of the vibration control object. For example, the vibration analysis unit periodically analyzes the vibration property of the vibration control object. This makes it possible to grasp the change in the vibration properties of the vibration control object. The presence or absence of damage or deterioration over time of the vibration control object, that is, the soundness of the vibration control object can be determined from the change in vibration properties.

  Further, in the present invention, since the vibration detecting piezoelectric element is attached to the tensile material provided on the vibration control object, the labor for attaching the vibration detecting piezoelectric element can be reduced.

  The vibration control device according to claim 3 is the vibration control device according to claim 1 or 2, wherein the tensile material is a wire, and the vibration control piezoelectric element or vibration detection piezoelectric element is It is a film type piezoelectric element affixed to the outer peripheral surface of a wire.

  According to the vibration control device of the third aspect, since the film-type piezoelectric element as the vibration control piezoelectric element or the vibration detection piezoelectric element is attached to the outer peripheral surface of the wire, the labor for attaching the film-type piezoelectric element is reduced. can do.

  Since the present invention has the above-described configuration, it is possible to reduce the trouble of attaching the piezoelectric element.

It is an elevation view which shows typically the stringed beam in which the vibration control apparatus which concerns on 1st Embodiment of this invention was installed. It is a perspective view which shows the one end part of the string material with which the piezoelectric element for vibration control shown by FIG. 1 was attached. FIG. 2 is an explanatory diagram for explaining a beam material damping method by the vibration control device shown in FIG. 1, wherein FIG. 1A schematically shows a state in which the string material is contracted by the vibration control piezoelectric element. FIG. 5B is an elevation view corresponding to FIG. 1 schematically showing a state in which the string material is extended. It is an elevation view which shows typically the stringed beam in which the vibration control apparatus which concerns on 2nd Embodiment of this invention was installed. It is a side view which shows typically the step which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention was applied. It is a longitudinal cross-sectional view which shows typically the glass screen to which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention was applied. It is a figure which shows typically the roof material to which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention is applied, (A) is a perspective view, (B) is 7B of FIG. 7 (A). FIG. It is a side view which shows typically the cantilever-type roof material to which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention was applied. It is an elevation view which shows typically the precast beam to which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention was applied. It is an elevation view which shows typically the cable-stayed bridge to which the modification of the vibration control apparatus which concerns on 1st Embodiment of this invention is applied.

  Hereinafter, a vibration control device according to an embodiment of the present invention will be described with reference to the drawings. In addition, the arrow V suitably shown in each figure has shown the vibration direction of the vibration control target object.

  First, the first embodiment will be described.

  FIG. 1 shows a stringed beam 10 on which a vibration control device 30 according to the first embodiment is installed. The stringed beam 10 supports, for example, a roof material of a structure, and is provided at the top of the structure. The stringed beam 10 includes a beam member 14 laid between a pair of support members 12, a string member 16 as a tension member stretched between both end portions 14 </ b> A and 14 </ b> B of the beam member 14, and the beam member 14 and the string member 16. And a plurality of (three in this embodiment) bundle members 18A, 18B, and 18C as connecting members.

  The beam member 14 is curved so as to protrude upward as a whole, and both end portions 14A and 14B thereof are supported by the pair of support members 12, respectively. The beam 14 vibrates in the vertical direction (arrow V direction) with its end portions 14A and 14B as fulcrums during an earthquake or a strong wind. The both end portions 14A and 14B of the beam member 14 and the pair of support members 12 may be pin-bonded or rigidly-bonded.

  A string member 16 is disposed below the beam member 14. The string material 16 is made of a wire such as a PC steel wire or a strand. The string member 16 is stretched between both end portions 14A and 14B of the beam member 14 while being curved so as to protrude toward the opposite side (downward) of the beam member 14.

  A plurality of bundle members 18 </ b> A to 18 </ b> C are disposed between the beam member 14 and the string member 16. Each of the bundle members 18 </ b> A to 18 </ b> C is a longitudinal member extending in a direction intersecting with the beam member 14 and the string member 16, and is arranged with an interval in the axial direction of the beam member 14 and the string member 16. Specifically, the bundle member 18B is disposed at the center in the longitudinal direction of the beam member 14 and the string member 16, and the bundle members 18A and 18C are disposed on both sides of the bundle member 18B.

  Each bundle member 18 </ b> A to 18 </ b> C has one longitudinal end portion (upper end portion) connected to the beam member 14 and the other longitudinal end portion (lower end portion) connected to the string member 16. The spacing between the beam member 14 and the string member 16 is maintained by these bundle members 18A to 18C.

  The vibration control device 30 is an active vibration control device that reduces the vibration of the beam member 14 as the vibration control object. The vibration control device 30 includes a vibration control piezoelectric element 32 as an actuator that applies a control force (vibration damping force) to the beam member 14 via the bundle members 18A to 18C by extending and contracting the string member 16 in the axial direction. A voltage is applied to the vibration control piezoelectric element 32 based on the acceleration sensor 34 as a vibration detection sensor for detecting the vibration (acceleration) of the beam member 14 and the acceleration of the beam member 14 detected by the acceleration sensor 34. The vibration control piezoelectric element 32 includes a vibration control unit 36 that expands and contracts the string material 16.

  The vibration control piezoelectric elements 32 are attached to both end portions 16A and 16B of the string material 16, respectively. As shown in FIG. 2, each vibration control piezoelectric element 32 is formed of a flexible sheet-like film-type piezoelectric element. The film-type piezoelectric element is, for example, a film obtained by bonding a polyimide film having electrodes printed on both surfaces of a fiber sheet formed of a bundle of fibrous piezoelectric ceramics with an epoxy resin, and applying an applied voltage. Accordingly, it is configured to contract (distort) in a predetermined direction (arrow D direction).

  The piezoelectric element 32 for vibration control is wound around the outer peripheral surface of one end portion 16A of the string material 16 with its expansion / contraction direction (strain direction) as the axis O direction of the string material 16, and the string material 16 is bonded by an adhesive such as epoxy resin. Affixed (adhered) to the outer peripheral surface. By applying a voltage to the vibration control piezoelectric element 32 at a predetermined interval and expanding or contracting the vibration control piezoelectric element 32 in the direction of arrow D, one end portion 16A of the string member 16 to which the vibration control piezoelectric element 32 is attached is formed. As shown in FIG. 1, the string member 16 is vibrated in the same direction as the vibration direction of the beam member 14 (arrow S direction) with its both ends 16A and 16B as fulcrums. Further, along with the vibration of the string member 16, the beam member 14 is vibrated in the vibration direction (arrow V direction) via the bundle members 18A to 18C. That is, the vibration direction control force F (FIG. 3A) is applied to the beam member 14 via the bundle members 18A to 18C by extending and contracting both end portions 16A and 16B of the string member 16 in the axial direction by the vibration control piezoelectric elements 32. Reference) is given.

  In addition, a vibration control unit 36 is electrically connected to each vibration control piezoelectric element 32. The vibration control unit 36 is configured by an electric circuit or the like having a general feedback circuit, and based on the output of the acceleration sensor 34 (acceleration of the beam member 14 detected by the acceleration sensor 34), The voltage applied to each vibration control piezoelectric element 32 is feedback controlled so as to cancel the vibration.

  Specifically, an acceleration sensor 34 as a vibration detection sensor that detects the vibration of the beam member 14 is electrically connected to the vibration control unit 36. The acceleration sensor 34 is attached to the central portion of the beam member 14 in the longitudinal direction, and outputs the detected acceleration of the beam member 14 to the vibration control unit 36 as acceleration information. Based on this acceleration information, for example, the vibration control unit 36 calculates the control force F in the opposite phase to the beam material 14, and the calculated control force F is applied to the beam material 14 via the bundle materials 18A to 18C. Thus, a voltage is applied to each vibration control piezoelectric element 32 at a predetermined interval. In other words, the vibration control unit 36 causes each vibration control piezoelectric element 32 to increase the control force F applied to the beam member 14 via the bundle members 18A to 18C when the acceleration of the beam member 14 increases. When the voltage applied to the beam member 14 is increased and the acceleration of the beam member 14 is reduced, the control force F applied to the beam member 14 via the bundle members 18A to 18C is reduced. The voltage applied to 32 is decreased.

  The vibration control unit 36 includes, for example, an amplifier that amplifies the acceleration information of the beam 14 detected by the acceleration sensor 34, an A / D converter that converts the acceleration information amplified by the amplifier into a digital signal, and the like. You may comprise.

  Next, the operation of the first embodiment will be described.

  When the beam 14 vibrates about the both ends 14A and 14B (in the direction of arrow V) during an earthquake or strong wind, the acceleration sensor 34 detects the acceleration of the beam 14 and outputs the acceleration information to the vibration control unit 36. Based on this acceleration information, the vibration control unit 36 calculates a control force F (see FIG. 3A) in phase opposite to that of the beam member 14, and the calculated control force F passes through the bundle members 18A to 18C. As applied to the beam member 14, a voltage is applied to each vibration control piezoelectric element 32 at a predetermined interval to expand and contract each vibration control piezoelectric element 32. As a result, both end portions 16A and 16B of the string member 16 to which each vibration control piezoelectric element 32 is attached are repeatedly expanded and contracted in the axial direction, and the string member 16 has the same vibration direction as the beam member 14 with the both end portions 16A and 16B serving as fulcrums. Vibrates in the direction (arrow S direction). Along with the vibration of the string member 16, a control force F having a phase opposite to that of the beam member 14 is applied to the beam member 14 through the bundle members 18A to 18C. Thereby, since the vibration of the beam member 14 is canceled, the vibration of the beam member 14 is reduced.

  More specifically, as shown in FIG. 3A, when a voltage is applied to each vibration control piezoelectric element 32 and the vibration control piezoelectric elements 32 are contracted, each vibration control piezoelectric element 32 is compressed. Both ends 16A and 16B of the string material 16 to which is attached are contracted, and a tensile force (tension) is introduced into the string material 16. Thereby, the full length of the string member 16 is shortened, and the beam member 14 is pushed upward through the bundle members 18A to 18C. As a result, the control force F is applied to the beam member 14.

  On the other hand, as shown in FIG. 3B, when the voltage applied to each vibration control piezoelectric element 32 is stopped and each contracted vibration control piezoelectric element 32 is restored (expanded), each vibration control piezoelectric element is restored. Both ends 16A and 16B of the string member 16 to which the element 32 is attached are restored (stretched) to the original length, and the tensile force introduced into the string member 16 is released. Thereby, the full length of the string member 16 is restored to the original length, and the beam member 14 and the bundle members 18A to 18C move downward. Further, the string material 16 is pushed downward by the inertia force of the beam material 14 and the bundle materials 18A to 18C, and the string material 16 extends in the axial direction.

  Thus, the both ends 16A and 16B of the string material 16 are expanded and contracted by the vibration control piezoelectric element 32, and the string material 16 is expanded and contracted in the axial direction. It is given to the beam member 14 through 18C. Therefore, since the vibration of the beam member 14 is canceled, the vibration of the beam member 14 is reduced.

  Further, in the present embodiment, since the vibration control piezoelectric element 32 is attached to the outer peripheral surface of the string material 16, the labor for attaching the vibration control piezoelectric element 32 is reduced. Furthermore, the vibration control piezoelectric element 32 can be easily attached not only to the newly installed string beam 10 but also to the existing string beam 10. Therefore, the versatility of the vibration control device 30 is improved.

  Further, by attaching the vibration control piezoelectric element 32 to both ends 16A and 16B of the string member 16, for example, compared to the case where the vibration control piezoelectric element 32 is attached to the center part of the string member 16, the vibration control piezoelectric element 32 is provided. The time and effort of attaching the battery can be further reduced. This is because both ends 16A and 16B of the string member 16 are easily reachable by the operator.

  In addition, by contracting the end portions 16A and 16B of the string member 16 with the vibration control piezoelectric element 32, for example, compared with a configuration in which the central part of the string member 16 is contracted with the vibration control piezoelectric element 32, the vibration control piezoelectric element 32 is small. A control force F having a predetermined magnitude can be generated by the contraction amount (distortion amount) of the piezoelectric element 32. Therefore, the power consumption of each vibration control piezoelectric element 32 can be reduced, and the size of each vibration control piezoelectric element 32 can be reduced.

  In the present embodiment, the example in which the vibration control piezoelectric elements 32 are respectively attached to the both end portions 16A and 16B of the string member 16 has been described, but the present invention is not limited thereto. There may be at least one piezoelectric element 32 for vibration control, and the number and arrangement thereof can be changed as appropriate. As described above, from the viewpoint of reducing the power consumption of the vibration control piezoelectric element 32 and the like, it is desirable that the vibration control piezoelectric element 32 is provided at the one end portion 16A or the other end portion 16B of the string member 16.

  Further, it is possible to attach the plurality of vibration control piezoelectric elements 32 to the string member 16 in a stacked state. In this case, the compression force of the vibration control piezoelectric element 32 can be increased in accordance with the number of stacked vibration control piezoelectric elements 32. Further, a plurality of vibration control piezoelectric elements 32 may be attached adjacent to the string material 16 in the axial direction. In this case, the amount of contraction that contracts the string material 16 can be increased in accordance with the number of piezoelectric elements 32 for vibration control.

  In the present embodiment, an example in which the acceleration sensor 34 is used as a vibration detection sensor that detects the vibration of the beam member 14 is shown, but the present invention is not limited thereto. As the vibration detection sensor, for example, a speed sensor or a displacement sensor may be used. In this case, based on the speed or displacement of the beam member 14 detected by the speed sensor or the displacement sensor, the vibration control unit 36 applies a voltage applied to the vibration control piezoelectric element 32 so that the vibration of the beam member 14 is canceled. Control it.

  Moreover, although the example which attached the acceleration sensor 34 to the beam material 14 was shown in this embodiment, it is not restricted to this. For example, it is possible to attach the acceleration sensor 34 to the string member 16 and indirectly detect the acceleration of the beam member 14. Further, as the vibration detection sensor, it is also possible to use a vibration detection piezoelectric element 44 as in a second embodiment described later.

  Next, a second embodiment will be described. In addition, the thing of the structure similar to 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  FIG. 4 discloses a vibration control device 40 according to the second embodiment. The vibration control device 40 according to the second embodiment analyzes the vibration properties of the beam member 14 while forcibly vibrating the beam member 14, thereby determining the soundness of the beam member 14. Device. The vibration control device 40 is attached to the other end portion 16B of the string member 16 and applies a voltage to the vibration control piezoelectric element 32 that applies a control force to the beam member 14 and the vibration control piezoelectric element 32, thereby controlling the vibration. A forced vibration control unit 42 for expanding and contracting the string material 16 to the piezoelectric element 32 for use, a vibration detection piezoelectric element 44 for detecting the vibration of the beam member 14 attached to one end portion 16A of the string material 16, and a vibration detection piezoelectric element 44 A vibration property analysis unit 46 that analyzes the vibration property of the beam member 14 based on the piezoelectric signal (vibration of the beam member 14 detected by the vibration detection piezoelectric element 44) is provided.

  The piezoelectric element 32 for vibration control applies a control force (excitation force) K to the beam member 14 through the bundle members 18A to 18C by forcing the other end portion 16B of the string member 16 to expand and contract, thereby forcing the beam member 14 into force. To vibrate. A forced vibration control unit 42 is electrically connected to the vibration control piezoelectric element 32. The forced vibration control unit 42 vibrates so that the beam member 14 is vibrated by, for example, a random wave or a sleep wave including at least one natural frequency of the beam member 14 in a predetermined mode (for example, primary mode). The voltage applied to the control piezoelectric element 32 is controlled.

  The vibration detecting piezoelectric element 44 functions as a vibration detecting sensor for detecting the vibration of the beam member 14. More specifically, the vibration of the beam member 14 is indirectly detected from the amount of expansion / contraction of the string member 16 that expands and contracts in the axial direction according to the vibration of the beam member 14. Similar to the vibration control piezoelectric element 32, the vibration detecting piezoelectric element 44 is formed of a film-type piezoelectric element, and is wound around the outer peripheral surface of one end portion 16A of the string member 16 with the expansion / contraction direction being the axial direction of the string member 16. It has been. The vibration detecting piezoelectric element 44 is attached (adhered) to the outer peripheral surface of the one end portion 16A of the string member 16 with an adhesive such as an epoxy resin, and expands and contracts (distorts) according to the amount of expansion and contraction of the string member 16 in the axial direction. ) As the vibration detecting piezoelectric element 44 expands and contracts, a piezoelectric signal corresponding to the expansion / contraction amount of the string member 16, that is, the vibration of the beam member 14 is output to a vibration property analysis unit 46 described later.

  A vibration property analyzing unit 46 is electrically connected to the vibration detecting piezoelectric element 44. The vibration property analysis unit 46 analyzes (estimates) the vibration property (dynamic characteristics) of the beam member 14 based on the piezoelectric signal input from the vibration detection piezoelectric element 44. The vibration property analysis unit 46 performs, for example, an FFT (Fast Fourier Transform) analysis on the piezoelectric signal input from the vibration detection piezoelectric element 44, and the vibration property of the beam member 14 is inherent to a predetermined mode of the beam member 14. It is configured to calculate the frequency.

  Next, a vibration property analysis method for the beam member 14 will be described, and the operation of the second embodiment will be described.

  First, a voltage is applied to the vibration control piezoelectric element 32 at a predetermined interval by the forced vibration control unit 42, the other end portion 16B of the string member 16 is expanded and contracted on the vibration control piezoelectric element 32, and the beam is passed through the bundle members 18A to 18C. A control force K in the vibration direction (arrow V direction) is applied to the material 14. Thereby, the beam member 14 vibrates in the vibration direction. At this time, the forced vibration control unit 42 controls the voltage applied to the vibration control piezoelectric element 32 so that the beam member 14 is vibrated by a predetermined random wave, sweep wave, or the like.

  When the beam member 14 vibrates, the vibration of the beam member 14 is transmitted to the string member 16 via the bundle members 18A to 18C. Thereby, the string member 16 expands and contracts in the axial direction according to the vibration of the beam member 14. As the string member 16 extends and contracts in the axial direction, the vibration detecting piezoelectric element 44 attached to the one end 16A of the string member 16 expands and contracts (distorts). As a result, a piezoelectric signal corresponding to the vibration of the beam member 14 is output from the vibration detecting piezoelectric element 44 to the vibration property analyzing unit 46. The vibration property analysis unit 46 performs FFT analysis or the like on the piezoelectric signal output from the vibration detecting piezoelectric element 44 and calculates the natural frequency of the beam material 14 in a predetermined mode as the vibration property of the beam material 14.

  Here, the vibration property of the beam member 14 changes due to the damage or aging deterioration. Therefore, by calculating and storing the vibration property of the beam member 14 periodically (for example, once a month) by the vibration property analysis unit 46, it becomes possible to grasp the change in the vibration property of the beam member 14. The presence or absence of damage or deterioration over time of the beam material 14, that is, the soundness of the beam material 14 can be determined from the change in vibration properties of the beam material 14. In addition, after the occurrence of an earthquake or the like, the vibration control device 40 analyzes (estimates) the vibration properties of the beam member 14 to determine whether or not the beam member 14 is damaged due to the earthquake. In the present embodiment, the soundness of the beam member 14 can be determined by calculating and storing the natural frequency of the beam member 14 in a predetermined mode as an example of the vibration property of the beam member 14.

  In the present embodiment, as in the first embodiment, the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 are affixed to the outer peripheral surface of the string member 16, so The labor for attaching the element 44 is reduced. Furthermore, the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 can be easily installed not only in the newly installed string beam 10 but also in the existing string beam 10. Therefore, the versatility of the vibration control device 40 is improved, and the presence or absence of damage or the like of the existing stringed beam 10 can be easily determined.

  Further, as in the first embodiment, the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 are attached to both end portions 16A and 16B of the string member 16, so that, for example, the vibration control piezoelectric element is provided at the center of the string member 16. Compared with the case where the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 are attached, the work of attaching the vibration control piezoelectric element 32 is further reduced.

  Furthermore, the vibration detecting piezoelectric element 44 is damaged by attaching the vibration detecting piezoelectric element 44 to the one end portion 16A of the stringing material 16 in which the amount of expansion and contraction in the axial direction is small during vibration compared to the central portion of the stringing material 16. Damage can be suppressed.

  In the present embodiment, the vibration property of the beam member 14 is calculated by the vibration property analysis unit 46 as the vibration property of the beam member 14. However, the present invention is not limited to this. As the vibration properties (dynamic characteristics) of the beam member 14, for example, acceleration (acceleration / control force), compliance (displacement / control force), mobility (speed / control force), and the like can be used.

  In the present embodiment, the example in which the vibration detecting piezoelectric element 44 is attached to the one end portion 16A of the string member 16 and the vibration control piezoelectric element 32 is attached to the other end portion 16B of the string member 16 is shown, but the present invention is not limited thereto. . The arrangement of the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 can be changed as appropriate. For example, the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 are attached to one end portion 16A of the string member 16. You may attach adjacent to a direction. In this case, the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 32 are compared with the case where the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 are respectively attached to both ends 16A and 16B of the string 16 as in the present embodiment. The trouble of attaching the piezoelectric element 44 is further reduced. It is also possible to attach the vibration controlling piezoelectric element 32 and the vibration detecting piezoelectric element 44 to the intermediate portion of the string member 16.

  Further, when the beam member 14 vibrates due to an earthquake or a strong wind, the vibration property of the beam member 14 may be analyzed by the vibration property analysis unit 46. In this case, the vibration control piezoelectric element 32 can be omitted.

  The vibration control device 40 according to the present embodiment can be appropriately combined with the vibration control device 30 according to the first embodiment. Specifically, the vibration control unit 36 (see FIG. 1) in the first embodiment is electrically connected to the vibration control piezoelectric element 32 in the present embodiment. When the beam member 14 vibrates during an earthquake or a strong wind, the vibration of the beam member 14 is canceled based on the vibration (piezoelectric signal) of the beam member 14 detected by the vibration detecting piezoelectric element 44. The vibration control unit 36 controls the voltage applied to the vibration control piezoelectric element 32. Thereby, the vibration of the beam member 14 can be reduced.

  As described above, when the vibration of the beam member 14 is reduced, the vibration control piezoelectric element 32 is caused to function as an actuator for applying the control force F to the beam member 14, while the control force is applied to the beam member 14 when the soundness of the beam member 14 is determined. By causing the vibration control piezoelectric element 32 to function as an actuator for applying K, the number of actuators can be reduced. Therefore, cost reduction can be achieved.

  Next, modified examples of the first and second embodiments will be described. In the following, various modified examples will be described taking the first embodiment as an example, but these modified examples are also applicable to the second embodiment.

  In the said 1st Embodiment, although the beam material 14 and the string material 16 were connected by several bundle material 18A-18C as a connection member, it was not restricted to this. There may be at least one connecting member, and the number and arrangement thereof can be changed as appropriate. In the first embodiment, the beam member 14 and the string member 16 are curved. However, the shapes of the beam member 14 and the string member 16 can be changed as appropriate.

  Moreover, although the said 1st Embodiment showed the example which installed the vibration control apparatus 30 in the stringed beam 10 as a vibration control target object, it does not restrict to this. For example, as shown in FIG. 5, the vibration control device 30 may be installed on a staircase 50 as a vibration control object.

  Specifically, the staircase 50 is bridged between the lower floor portion 52 of the lower floor and the upper floor portion 54 of the upper floor. The staircase 50 includes a landing 50M provided approximately in the middle between the lower floor 52 and the upper floor 54, a plurality of lower floor side stepboards 50L provided on the lower floor 52 side with respect to the landing 50M, and a landing 50M. On the other hand, a plurality of upper floor side treads 50U provided on the upper floor portion 54 side are provided.

  On the back surface side (lower side) of the lower floor side footboard 50L, string members 56L to which the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 as a vibration detection sensor are respectively attached are arranged at both ends thereof. The string material 56L is stretched between the lower end of the staircase 50 and the upper floor side end of the landing 50M, and the center thereof is connected to the lower floor side end of the landing 50M via a bundle 58L. ing. Similarly, on the surface side (upper side) of the upper floor plate 50U, a string material 56U having vibration control piezoelectric elements 32 and vibration detection piezoelectric elements 44 as vibration detection sensors attached to both ends thereof is disposed. Has been. The string material 56U is stretched between the end portion of the upper floor portion 54 and the lower floor side end portion of the landing 50M, and the central portion thereof is connected to the upper floor side end portion of the landing 50M via the bundle material 58U. Has been. That is, the string 50 is applied to the staircase 50.

  Here, the staircase 50 vibrates in the vibration direction (arrow V direction) due to a person going up and down, an earthquake, or the like. On the other hand, the vibration control piezoelectric element 32 extends and contracts one end of each of the string members 56L and 56U in the axial direction, so that a control force F in the vibration direction is applied to the staircase 50 via the bundle members 58L and 58U. Therefore, based on the vibration of the staircase 50 detected by the vibration detecting piezoelectric element 44, a vibration control unit (not shown) expands and contracts the string members 56L and 56U in the axial direction on the vibration controlling piezoelectric element 32, and bundles 58L and 58U. By applying a control force F having a phase opposite to that of the staircase 50 to the staircase 50 through the step 50, vibration of the staircase 50 can be reduced.

  Next, FIG. 6 shows a glass screen 60 as a vibration control object on which the vibration control device 30 is installed. The glass screen 60 is configured by connecting a plurality of plate glasses 60 </ b> A arranged vertically and horizontally by a clamp member 62, and is arranged in a wall shape between the upper and lower beams 64. On the indoor side of the glass screen 60, a first string material 66A having vibration control piezoelectric elements 32 and vibration detection piezoelectric elements 44 attached to both ends thereof, and vibration control piezoelectric elements 32 and vibrations attached to both ends thereof. A second string material 66B to which the detection piezoelectric element 44 is attached is disposed.

  The first string member 66A is attached to the tip of a bundle member 68 provided on two clamp members 62 adjacent in the vertical direction, and between the upper and lower beams 64 so as to press each bundle member 68 toward the glass screen 60 side. It is stretched over. On the other hand, the second string material 66B is attached to the base end side (glass screen 60 side) of the two bundle members 68, and is stretched between the upper and lower beams 64 so as to press each bundle member 68 to the indoor side. Yes. That is, a stringed string structure is applied to the glass screen 60. The pressing force of the first string member 66A against the bundle members 18A to 18C and the pressing force of the second string member 66B against the bundle members 18A to 18C are balanced.

  Here, the glass screen 60 vibrates in the vibration direction (arrow V direction) due to wind pressure, earthquake, or the like. On the other hand, the vibration control piezoelectric element 32 extends and contracts one end portion of the first string material 66A and the second string material 66B in the axial direction, thereby controlling the vibration direction control force F on the glass screen 60 via the bundle material 68 and the clamp material 62. To be granted. Therefore, based on the vibration of the glass screen 60 detected by the vibration detecting piezoelectric element 44, a vibration control unit (not shown) causes the vibration controlling piezoelectric element 32 to place one end portions of the first string material 66A and the second string material 66B in the axial direction. The vibration of the glass screen 60 can be reduced by extending and contracting and applying the control force F in the opposite phase to the glass screen 60 to the glass screen 60 through the bundle 68.

  Next, FIGS. 7A and 7B show a dome-shaped roof material 70 as a vibration control object on which the vibration control device 30 is installed. The roof material 70 is attached to each corner of a frame material 72 having four corners in plan view. On the back side of the roof material 70, a first string material 74A having the vibration control piezoelectric element 32 and the vibration detection piezoelectric element 44 attached to both ends thereof, and the vibration control piezoelectric element 32 and the vibration at both ends thereof. A second string material 74B to which the detection piezoelectric element 44 is attached is disposed.

  The first string material 74 </ b> A is stretched over one diagonal of the frame material 72, and the second string material 74 </ b> B is stretched over the other diagonal of the frame material 72. The first string material 74A and the second string material 74B intersect each other at the center, and the intersection is connected to the center (top) 70A of the roof material 70 via a bundle 76. . That is, a string structure is applied to the roof material 70.

  Here, as shown in FIG. 7B, the roof material 70 vibrates in the vibration direction (arrow V direction) due to wind pressure, earthquake, or the like. On the other hand, one end portion of the first string material 74A and the second string material 74B is expanded and contracted in the axial direction by the vibration control piezoelectric element 32, whereby a control force F in the vibration direction is applied to the roof material 70 via the bundle material 76. The Therefore, based on the vibration of the roof material 70 detected by the vibration detection piezoelectric element 44, the vibration control unit (not shown) places one end of the first string material 74A and the second string material 74B in the axial direction on the vibration control piezoelectric element 32. The vibration of the roof material 70 can be reduced by applying the control force F in the opposite phase to the roof material 70 to the roof material 70 via the bundle material 76. As with the roof material 70, the vibration control device 30 can be installed on a parabolic antenna as a vibration control object.

  Moreover, although the example which attached the piezoelectric element 32 for vibration control to the string material 16 which comprises a string structure was shown in the said 1st Embodiment, it is not restricted to this. For example, as shown in FIG. 8, the vibration control device 30 may be installed on a cantilevered roof material 80 as a vibration control object.

  Specifically, the roof material 80 has a three-dimensional truss structure, and the middle portion in the longitudinal direction is supported by the top portion 82 </ b> A of the column 82. A PC steel material 84 as a tensile material composed of a wire material such as a PC steel wire or a PC steel rod is stretched between one end portion of the roof material 80 and the lower end portion of the support 82. By this PC steel material 84, the roof material 80 is supported so as not to rotate counterclockwise in the figure (in the direction of arrow G) with the top portion 82A of the column 82 as a fulcrum. Moreover, the piezoelectric element 32 for vibration control and the piezoelectric element 44 for vibration detection are attached to one end part (lower end part) of the PC steel material 84 adjacent to each other in the axial direction.

  Here, the roof material 80 rotates and vibrates in the direction of the arrow R with the top portion 82A of the support column 82 as a fulcrum during an earthquake or a strong wind. On the other hand, by extending or contracting one end portion of the PC steel material 84 in the axial direction by the vibration control piezoelectric element 32, the roof material 80 is vibrated in the same direction as the vibration direction (arrow R direction) with the top portion 82A of the support 82 as a fulcrum. The Therefore, based on the vibration of the roof material 80 detected by the vibration detecting piezoelectric element 44, a vibration control unit (not shown) causes the vibration control piezoelectric element 32 to extend and contract one end portion of the PC steel material 84 in the axial direction. The vibration of the roofing material 80 can be reduced by applying the control force F in the opposite phase to the roofing material 80 to the roof.

  Next, FIG. 9 shows a precast beam 90 as a vibration control object on which the vibration control device 30 is installed. The precast beam 90 is made of precast concrete and is laid between a pair of precast columns 92. In addition, a sheath tube 94 is embedded in the precast beam 90. The sheath tube 94 extends in the axial direction of the precast beam 90 and is curved so that the middle portion in the longitudinal direction protrudes downward. In this sheath tube 94, a PC steel material 96 is inserted as a tensile material made of a wire material such as a PC steel wire or a PC steel rod. Both ends of the PC steel material 96 are fixed to both ends of the sheath tube 94 by a fixing bracket 98 or the like in a state where a tensile force is introduced. Prestress is introduced into the precast beam 90 by the PC steel material 96. Further, a vibration control piezoelectric element 32 and a vibration detection piezoelectric element 44 are attached to both ends of the PC steel material 96, respectively.

  Here, the precast beam 90 vibrates in the vertical direction (in the direction of arrow V) with a joint portion (joint portion) with a pair of precast columns 92 as a fulcrum at the time of an earthquake, strong wind, walking of a building user, or the like. . On the other hand, the PC steel material 96 vibrates in the same direction as the vibration direction (arrow V direction) of the precast beam 90 with the both ends thereof as fulcrums by extending and contracting one end portion of the PC steel material 96 in the axial direction by the piezoelectric element 32 for vibration control. To do. Thereby, the control force F is given to the longitudinal direction intermediate part of the precast beam 90 through the intermediate part of the said PC steel material 96 curved in convex shape.

  Therefore, based on the vibration of the precast beam 90 detected by the vibration detection piezoelectric element 44, a vibration control unit (not shown) extends the PC steel material 96 in the vibration control piezoelectric element 32 in the axial direction, and the precast beam 90 is precast. By applying the control force F in the opposite phase to the beam 90, the vibration of the precast beam 90 can be reduced.

  Next, FIG. 10 shows a bridge girder 102 of a cable-stayed bridge 100 as a vibration control object on which the vibration control device 30 is installed. The cable stayed bridge 100 is bridged diagonally between the bridge girder 102, the plurality of main towers 104, and the main towers 104 and the bridge girder 102. Cable 106. A vibration control piezoelectric element 32 or a vibration detection piezoelectric element 44 is attached to one end (lower end) of each cable 106 as a wire.

  Here, the bridge girder 102 vibrates in the vertical direction (in the direction of the arrow V) with the connecting portion with the main tower 104 as a fulcrum when the vehicle travels, during an earthquake, or during a strong wind. On the other hand, the bridge girder 102 is vibrated in the vibration direction (arrow V direction) by extending or contracting one end of the cable 106 in the axial direction by the vibration control piezoelectric element 32. By this cable 106, a control force F in the vibration direction is applied to the bridge girder 102.

  Therefore, based on the vibration of the bridge girder 102 detected by the vibration detection piezoelectric element 44, a vibration control unit (not shown) extends the cable 106 in the vibration control piezoelectric element 32 in the axial direction and causes the bridge girder 102 to be opposite to the bridge girder 102. By applying the phase control force F, vibration of the bridge girder 102 can be reduced.

  Moreover, in the said 1st Embodiment, although the string material 16 was used as a tension | tensile_strength material, it is not restricted to this. For example, a plate member as a tensile member made of a steel plate or the like is installed between the pair of support members 12 and the plate member and the beam member 14 are connected by a connecting member to form a stringed structure. And the vibration control piezoelectric element 32 is stuck on at least one of the front surface and the back surface of the plate material so that the plate material can be expanded and contracted. The vibration of the beam member 14 is reduced by extending and contracting the plate member by the vibration control piezoelectric element 32 and applying a control force (damping force) to the beam member 14 via the connecting member. Thus, the tension material is a concept including not only a wire material such as the string material 16 but also a plate material and the like. In addition, when a vibration control piezoelectric element is attached to a plate material, the vibration control piezoelectric element is not required to be flexible. Therefore, the vibration control piezoelectric element may be composed of a laminated piezoelectric element or the like. The same applies to the vibration detecting piezoelectric element.

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to such first and second embodiments, and the first and second embodiments and various modified examples are appropriately used. Of course, they may be used in combination, and can be implemented in various modes within the scope of the present invention.

14 Beam material (vibration control object)
16 String material (tensile material, wire material)
30 Vibration Control Device 32 Vibration Control Piezoelectric Element 34 Acceleration Sensor (Vibration Detection Sensor)
36 Vibration Control Unit 40 Vibration Control Device 44 Vibration Detection Piezoelectric Element 46 Vibration Property Analysis Unit 50 Staircase (Vibration Control Object)
56L String material (tensile material, wire)
56U String material (tensile material, wire)
60 Glass screen (vibration control object)
66A String material (tensile material, wire material)
66B String material (tensile material, wire material)
70 Roofing material (vibration control object)
74A String material (tensile material, wire)
74B String material (tensile material, wire material)
80 Roofing material (vibration control object)
84 PC steel (tensile, wire)
90 Precast beam (vibration control object)
96 PC steel (tensile, wire)
102 Bridge girder (vibration control object)
106 cable (tensile, wire)

Claims (3)

Attached to tension member tension with provided in the vibration control object is introduced, and a vibration control piezoelectric element expanding and contracting the cited stretched member in the direction of introduction of the tensile force,
A vibration detection sensor for detecting the vibration of the vibration control object;
Based on the output of the vibration detection sensor, the vibration control unit that expands and contracts the tension material on the vibration control piezoelectric element and controls the vibration of the vibration control object;
A vibration control device. A piezoelectric element for vibration detection that is provided on a vibration control object and is attached to a tensile material to which a tensile force is introduced, and is expanded and contracted in the direction in which the tensile force is introduced by expansion and contraction of the tensile material accompanying vibration of the vibration control object. When,
Based on the piezoelectric signal of the vibration detecting piezoelectric element, a vibration property analyzing unit that analyzes the vibration property of the vibration control object;
A vibration control device. The tensile material is a wire;
The vibration control piezoelectric element or the vibration detecting piezoelectric element, a film-type piezoelectric element attached to the outer peripheral surface of said wire,
The vibration control apparatus according to claim 1 or 2.

Images