JP2008232331A - Mounting structure of piezo element to the vibration-damped body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for attaching a piezo element to a controlled body capable of surely distorting the piezo element by devising a structure for attaching the piezo element to a controlled body (interior plate).
In a mounting structure of a piezo element to a vibration-damped body, fixing protrusions 2 and 3 arranged on the vibration-damped body (interior plate) 1 and beams fixed to the fixing protrusions 2 and 3 And a piezo element 5 attached to the beam-like member 4.
[Selection] Figure 1

Description

  The present invention relates to a structure for mounting a piezo element to a controlled body applied to a controlled body (interior plate) such as a vehicle.

Conventionally, a piezo element is directly attached to a vibration-damped body (inner panel) of a vehicle, etc., and distortion caused by vibration generated in the vibration-damped body (inner panel) is converted into electric energy. There is a method to reduce the noise by generating vibration damping effect by releasing it as thermal energy with the resistance of the connected branch circuit (inductance circuit, negative capacity circuit, etc.), and reducing the vibration of the controlled body (interior plate) It has been reported (see Non-Patent Documents 1 to 4 below).
“Soundproofing and anti-vibration technology to realize weight reduction of vehicle body”, Hideki Minami, Takahiro Tomioka, Norio Takagami, RRR 2004, No. 1 Pages 26-29 “In-vehicle noise reduction using piezoelectric material”, Katsuya Yamamoto, Mineyuki Asahina, RRR 2005, No. 12 pp. 26-29 “Active Sound Insulation Control Using Piezoelectric Vibrators”, Hiroyuki Watanabe, Katsuyoshi Suzuki, Hideharu Isaka, Kazuyoshi Iida, Satoru Akutsu, Japan Society of Mechanical Engineers, No. 05-15 “Active sound insulation and suppression of acoustic vibration using smart structure”, Masaki Otomori, Hiroshi Okubo, Takashi Shimomura, Hiroshi Tokutake, Japan Society of Mechanical Engineers, No. 06-7

  However, in the conventional method of attaching a piezo element to a controlled body (interior plate), the amount of distortion of the piezo element is constrained by the amount of distortion of the controlled body (interior plate), and a sufficient voltage (damping effect) is generated. Cannot be obtained. In addition, there are drawbacks such as the location and frequency of the piezo element where the damping effect can be effectively obtained by the vibration mode of the controlled body (interior plate) is limited.

  In view of the above situation, the present invention devised a structure for attaching a piezo element to a vibration-damped body (interior plate) and attached the piezo element to the vibration-damped body capable of reliably distorting the piezo element. The purpose is to provide a structure.

In order to achieve the above object, the present invention provides
[1] In a mounting structure of a piezo element to a vibration-damped body, a fixing protrusion disposed on the vibration-damped body, a beam-shaped member fixed to the fixing protrusion, and affixed to the beam-shaped member And a piezo element.

  [2] In the attachment structure of the piezo element to the vibration-damped body according to [1], the fixing protrusions are arranged at both ends of the beam-like member.

  [3] In the attachment structure of the piezoelectric element to the vibration-damped body according to [1], the fixing protrusion is disposed at a central portion of the beam-shaped member.

  [4] In the attachment structure of the piezoelectric element to the vibration-damped body according to [2] or [3], the piezoelectric element is arranged on one side of a central portion of the beam-shaped member.

  [5] In the attachment structure of the piezoelectric element to the vibration-damped body according to [2] or [3], the piezoelectric element is arranged on both surfaces of a central portion of the beam-shaped member.

  [6] In the structure for attaching a piezoelectric element to the vibration-damped body described in [2] or [3] above, the piezoelectric element is a bimorph type, and a beam-like piece is a joint beam-like member at both ends thereof. And

  [7] In the attachment structure of the piezoelectric element to the vibration-damped body described in [2] or [3], the piezoelectric element is arranged on both surfaces of the beam-shaped member.

  [8] In the attachment structure of the piezoelectric element to the vibration-damped body described in [4], the piezoelectric element is a bimorph type piezoelectric element.

  [9] In the attachment structure of the piezoelectric element to the vibration-damped body described in [4], [5], [6], or [7], a weight is arranged on the piezoelectric element.

  [10] In the attachment structure of the piezoelectric element to the vibration-damped body according to [4], [5], [6], or [7], weights are arranged at both ends of the beam-shaped member. To do.

  [11] In the attachment structure of the piezoelectric element to the vibration-damped body according to [9] or [10], the weight is a control circuit for the piezoelectric element.

  According to the present invention, the piezo element can be reliably distorted by devising the structure for attaching the piezo element of the vibration-damped body (interior plate).

  By attaching the piezo element to a beam-like member different from the controlled body (interior panel), a large generated voltage (damping effect) regardless of the magnitude of the vibration of the controlled body (interior panel) and the amount of strain generated ) Can be obtained.

  By sticking the piezo element to the beam-like member and adjusting the length, stiffness, mass, and mass of the additional weight, it is possible to obtain damping characteristics corresponding to an arbitrary frequency.

  Further, the vibration damping characteristic can be controlled by changing the characteristic of the electric control circuit connected to the piezo element.

  The piezoelectric element mounting structure to the vibration-damped body of the present invention includes a fixing protrusion disposed on the vibration-damped body, a beam-shaped member fixed to the fixing protrusion, and affixed to the beam-shaped member. A piezo element.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a view showing a structure for attaching a piezo element to a vibration-damped body (interior plate) according to a first embodiment of the present invention.

  In this figure, 1 is a vibration-damped body (interior plate), 2 and 3 are fixing projections formed on the vibration-damped body (interior plate) 1, and 4 is a beam-like member to which a piezo element 5 is attached. is there.

  Thus, in this embodiment, both ends of the beam-like member 4 are fixed by the fixing protrusions 2 and 3 on the vibration-damped body (interior plate) 1. That is, since the fixing protrusions 2 and 3 are arranged at predetermined positions of the vibration-damped body (interior plate) 1 and the beam-like member 4 with the piezo element 5 attached thereto is provided, the vibration-damped body (interior plate) ) Vibration at a predetermined position of 1 can be reliably detected.

  FIG. 2 is a view showing a structure for attaching a piezo element to a vibration-damped body (interior plate) according to a second embodiment of the present invention.

  In this figure, 11 is a controlled body (interior plate), 12 is a fixing projection formed on the controlled body (interior plate) 11, and 13 is a beam-like member to which a piezo element 14 is attached.

  Thus, in this embodiment, the center of the beam-like member 13 is fixed by the fixing protrusion 12 on the vibration-damped body (interior plate) 11. That is, since the fixing protrusion 12 is disposed at a predetermined position of the vibration-damped body (interior plate) 11 and the piezo element 14 is attached to the central surface of the beam-like member 13, the vibration-damped body (interior plate) ) The vibration at the predetermined position 11 can be reliably detected.

  FIG. 3 is a view showing a state (part 1) in which the piezo element is mounted on the beam-like member according to the embodiment of the present invention.

  In this figure, reference numeral 21 denotes a beam-like member, and the piezo element 22 is pasted only on one central surface of the beam-like member 21.

  FIG. 4 is a view showing a state (part 2) in which the piezo element is mounted on the beam-like member according to the embodiment of the present invention.

  In this figure, reference numeral 31 denotes a beam-like member, and piezo elements 32 and 33 are pasted on both central surfaces of the beam-like member 31. That is, a piezo element 32 is attached to the front side of the center of the beam-like member 31 and a piezo element 33 is attached to the back side of the center of the beam-like member 31 to form a bimorph type.

  FIG. 5 is a view showing a state (part 3) in which the piezo element is mounted on the beam-like member according to the embodiment of the present invention.

  In this figure, beam-shaped pieces 41 and 43 are attached to both ends of a bimorph piezoelectric element 42 to form a beam-shaped member.

  FIG. 6 is a diagram showing an attachment state (part 4) of the piezo element on the beam-like member according to the embodiment of the present invention.

  In this figure, reference numeral 51 denotes a beam-like member, and piezo elements 52 and 53 are attached to the entire both surfaces of the beam-like member 51 to form a beam-like bimorph type piezo element.

  FIG. 7 is a diagram showing an attachment state (No. 5) of the piezo element on the beam-like member according to the embodiment of the present invention.

  In this figure, the bimorph type piezo element 56 is attached only to the central one surface of the beam-like member 55.

  FIG. 8 is a view showing a structure for attaching a piezo element to a vibration-damped body (interior plate) according to a third embodiment of the present invention.

  In this figure, 61 is a vibration-damped body (interior plate), 62 and 63 are fixing projections arranged on predetermined positions of the vibration-damped body (interior plate) 61, and 64 is affixed with piezo elements 65 and 66. It is a beam-shaped member.

  Thus, in this embodiment, both ends of the beam-like member 64 are fixed by the fixing protrusions 62 and 63 on the vibration-damped body (interior plate) 61. In other words, the fixing projections 62 and 63 are arranged at predetermined positions of the vibration-damped body (interior plate) 61, the piezo elements 65 and 66 are attached to both central surfaces of the beam-like member 64, and the piezo elements 65 are further mounted on the piezo elements 65. The weight 67 is arranged so as to increase the inertial force. If it is desired to further increase the inertial force, the weight 68 can be disposed on the lower surface of the piezo element 66.

  FIG. 9 is a view showing a structure for attaching a piezo element to a vibration-damped body (interior plate) according to a fourth embodiment of the present invention.

  In this figure, 71 is a vibration-damped body (interior plate), 72 is a fixing projection arranged on a predetermined position of the vibration-damped body (interior plate) 71, and 73 is a beam-like shape to which piezo elements 74 and 75 are attached. It is a member.

  Thus, in this embodiment, the center of the beam-like member 73 is fixed by the fixing protrusion 72 on the vibration-damped body (interior plate) 71. That is, the fixing protrusion 72 is disposed at a predetermined position of the vibration-damped body (interior plate) 71, and the piezo elements 74 and 75 are pasted on both central surfaces of the beam-like member 73. Further, the inertia of the piezo elements 74 and 75 is further increased. In order to increase the force, weights 76 and 77 are arranged at both ends of the beam-like member 73. If it is desired to further increase the inertial force, the weights 78 and 79 can be disposed on the lower surface of the beam-like member 73.

  Although not shown, the output from the piezo element is guided to the control circuit, and the piezo element is controlled by the feedback output from the control circuit to control the vibration of the controlled body (interior plate). A vibration function is provided to prevent noise caused by vibration of the controlled body (interior plate). In that case, the control circuit may be arranged on the piezo element instead of the weight. If comprised in this way, the weight reduction and size reduction of an apparatus can be achieved.

  According to the present invention, a piezo element is attached to a beam-like member, and both sides or a central part thereof are attached to a vibration-damped body (interior plate), and a large strain is applied to the piezo element regardless of the position of application to the vibration-damped body. By generating, it is possible to obtain a larger generated voltage (damping effect) than when directly sticking to the vibration-damped body (interior plate).

  As described above, the beam-like member can be variously modified. For example, a piezo element is attached to one central surface of the beam-like member. In addition, a piezo element is attached to both sides of the center to form a bimorph type. A beam-shaped member may be added to both ends of the bimorph type piezoelectric element, or the entire beam-shaped member may be a bimorph type piezoelectric element.

  The method of changing the natural frequency of the beam-like member according to the frequency of the vibration-damped body (interior plate) is to change the overall length of the beam-like member, change the rigidity of the beam-like member, or both ends of the beam-like member Attaching a weight to the central part of the beam-like member when attaching to the controlled body (interior plate), and attaching a weight to both ends of the beam-like member when attaching the central part of the beam-like member to the controlled body (interior plate) There are various methods such as attaching. It is also conceivable to use a piezo element control circuit instead of a weight in order to reduce the weight and size of the apparatus.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The structure for attaching a piezo element to a vibration-damped body of the present invention can be used for damping a vibration-damped body (interior plate) of a vehicle or the like, and thus preventing noise of the vibration-damped body of a vehicle or the like.

It is a figure which shows the attachment structure of the piezoelectric element to the to-be-damped body (interior board) which shows 1st Example of this invention. It is a figure which shows the attachment structure of the piezoelectric element to the to-be-vibrated body (interior board) which shows 2nd Example of this invention. It is a figure which shows the attachment state (the 1) of the piezoelectric element on the beam-shaped member which shows the Example of this invention. It is a figure which shows the attachment state (the 2) of the piezoelectric element on the beam-shaped member which shows the Example of this invention. It is a figure which shows the attachment state (the 3) of the piezoelectric element on the beam-shaped member which shows the Example of this invention. It is a figure which shows the attachment state (the 4) of the piezo element on the beam-shaped member which shows the Example of this invention. It is a figure which shows the attachment state (the 5) of the piezoelectric element on the beam-shaped member which shows the Example of this invention. It is a figure which shows the attachment structure of the piezoelectric element to the to-be-vibrated body (interior board) which shows 3rd Example of this invention. It is a figure which shows the attachment structure of the piezoelectric element to the to-be-vibrated body (interior board) which shows 4th Example of this invention.

Explanation of symbols

1, 11, 61, 71 Damped body (interior plate)
2, 3, 12, 62, 63, 72 Fixing protrusions 4, 13, 21, 31, 51, 55, 64, 73 Beam-like members 5, 14, 22, 32, 33, 52, 53, 65, 66, 74,75 Piezo element 42,56 Bimorph type piezo element 67,68,76,77,78,79 Weight 41,43 Beam-shaped piece

Claims (11)

(A) a fixing protrusion disposed on the vibration-damped body;
(B) a beam-like member fixed to the fixing protrusion;
(C) A piezo element mounting structure to a vibration-damped body, comprising a piezo element attached to the beam-like member.   2. A structure for mounting a piezo element to a vibration-damped body according to claim 1, wherein the fixing protrusions are disposed at both ends of the beam-like member. .   2. A structure for mounting a piezo element to a vibration-damped body according to claim 1, wherein the fixing protrusion is disposed at a central portion of the beam-shaped member. .   4. A structure for mounting a piezo element to a vibration-damped body according to claim 2 or 3, wherein the piezo element is arranged on one surface of a central portion of the beam-shaped member. Mounting structure.   4. A structure for mounting a piezoelectric element to a vibration-damped body according to claim 2 or 3, wherein the piezoelectric element is arranged on both surfaces of a central portion of the beam-shaped member. Mounting structure.   4. A structure for mounting a piezo element to a vibration-damped body according to claim 2 or 3, wherein the piezo element is a bimorph type, and a beam piece is a joint beam-like member at both ends thereof. The mounting structure of the piezo element.   The attachment structure of a piezo element to a vibration-damped body according to claim 2 or 3, wherein the piezo element is disposed on both surfaces of the beam-like member. .   5. A structure for mounting a piezo element to a controlled vibration body according to claim 4, wherein the piezo element is a bimorph piezo element.   8. A structure for mounting a piezo element to a vibration-damped body according to claim 4, 5, 6, or 7, wherein a weight is arranged on the piezo element.   8. The structure of attaching a piezo element to a vibration-damped body according to claim 4, 5, 6, or 7, wherein weights are arranged at both ends of the beam-like member. Mounting structure.   The attachment structure of a piezo element to a controlled body according to claim 9 or 10, wherein the weight is a control circuit of the piezo element.

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