JP2008267538A - Vibration reducing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration reducing member equipped with a compact dynamic vibration absorber capable of reducing the vibrations in different frequencies simultaneously in the same installation position in such an arrangement that a plurality of dynamic absorbers to handle different frequencies from a vibratory appliance make no interference with one another. <P>SOLUTION: The vibration reducing member 1 is equipped with a plate-form first oscillator 2 having a folded-back shape and arranged in the line symmetry and a plate-form second oscillator 3 formed symmetrically with respect to the first oscillator 2 in such a manner as to face it 2 in the direction orthogonal to the line symmetry direction, wherein the two oscillators 2 and 3 constitute a pair of dynamic absorbers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration reducing member that can reduce vibrations in a plurality of frequency ranges from a vibrating device.

  High-speed rotating parts such as motors and gears are used in vibration devices such as AV (Audio Visual) devices and copiers. The increase in vibration accompanying the high-speed rotation of these components leads to noise problems and deterioration of reading accuracy, and it is necessary to take measures to reduce vibration noise. The vibration of the components accompanying the high-speed rotation mainly occurs due to intermittent rotation of the motor (effect due to pulse signal and magnet arrangement applied to the motor) and collision of gear teeth. Therefore, the excitation cycle is constant. With this period as T [s], the reciprocal of the period T (= 1 / T) becomes the fundamental frequency f [Hz].

  Conventionally, as a technique for reducing the above-described vibration, a dynamic vibration absorber that reduces vibration by matching the resonance frequency of a dynamic vibration absorber made of a mass and a spring to the fundamental frequency f has been proposed (for example, Patent Documents). 1). In the dynamic vibration absorber described in Patent Document 1, a dynamic vibration absorber using an elastic member is attached to a rotating shaft of a motor. On the other hand, vibrations from vibration devices such as AV devices and copiers are not limited to the fundamental frequency f, but are also integral multiples of the fundamental frequency (2f [Hz], 3f [Hz],..., Nf [Hz]. ] Of harmonic vibration) is also generated at the same time. However, in the dynamic vibration absorber described in Patent Document 1, the adjustment of the frequency at which vibration can be reduced is limited to a single frequency such as the fundamental frequency f. Therefore, in order to stop the vibration almost completely, a technology capable of simultaneously dealing with not only the fundamental frequency but also the harmonic vibration is required. For example, the following techniques have been proposed as techniques capable of simultaneously dealing with harmonic vibration.

  Conventionally, a ship main engine control apparatus using a dynamic vibration absorber has been proposed (see, for example, Patent Document 2). The ship main engine control device described in Patent Document 2 is a device in which a dynamic vibration absorber having a plurality of additional weights and a diaphragm fixed to form a mass-spring system is attached to a diesel engine installed in an engine room of a hull. is there. A small dynamic vibration absorber having a plurality of elastic bodies and weights has also been proposed (see, for example, Patent Document 3). The small dynamic vibration absorber described in Patent Document 3 is a dynamic vibration absorber in which one end of a plurality of elastic bodies is fixed to the dynamic vibration absorber body, and a weight is provided at the other end of the plurality of elastic bodies so that the position can be adjusted. It is a vessel. Furthermore, a vibration reduction bracket formed by cutting a plurality of different vibration absorbing parts into a part of the bracket body has also been proposed (see, for example, Patent Document 4). The vibration reducing bracket described in Patent Document 3 is a bracket in which a plurality of vibration absorbing portions having different natural frequencies of vibrating portions are formed in a part of the bracket body.

JP 2002-266940 A JP-A-2-256593 JP-A-4-151043 JP 2006-258286 A

  However, the techniques for reducing the vibrations described in Patent Document 2 to Patent Document 4 are all techniques for installing individual dynamic vibration absorbers corresponding to the respective frequencies with respect to vibrations having a plurality of frequencies. . However, when considering the vibration reduction of a continuum having a vibration distribution, such as a plate-like body, the bending wave wavelength (between the antinodes of the wave) that propagates the bending deformation that occurs in the continuum as the frequency increases. (Interval) becomes shorter. In addition, when considering the case of simultaneously reducing the vibration of the frequency of the fundamental order f and the harmonics (2f, 3f,..., Nf), the higher the frequency, the shorter the wavelength of the bending wave. Many dynamic vibration absorbers are required. For this reason, the interval between the dynamic vibration absorbers having different resonance frequencies becomes narrow, and when dynamic vibration absorbers corresponding to the respective frequencies are installed, the dynamic vibration absorbers interfere with each other and may not be installed.

  The present invention has been made in view of the above circumstances, and its purpose is to vibrate vibrations at a plurality of frequencies at the same installation position so that dynamic vibration absorbers corresponding to the plurality of frequencies from the vibration device do not interfere with each other. An object of the present invention is to provide a vibration reducing member including a compact dynamic vibration absorber that can be simultaneously reduced.

Means and effects for solving the problems

  The vibration reducing member according to the present invention relates to a vibration reducing member that can reduce vibrations in a plurality of frequency ranges from a vibrating device. And the vibration reduction member which concerns on this invention has the following some features in order to achieve the said objective. That is, the vibration reducing member of the present invention includes the following features alone or in combination.

  In order to achieve the above object, a first feature of the vibration reducing member according to the present invention is a first vibrating body having a folded shape and being line-symmetric, and a direction orthogonal to the line-symmetrical direction. A second vibrating body formed symmetrically with respect to the first vibrating body so as to face the first vibrating body, wherein the first vibrating body and the second vibrating body are a pair of dynamic vibration absorbers Forming a vessel.

  According to this configuration, by making the dynamic vibration absorber having a folded shape, the vibration body constituting the dynamic vibration absorber (the first vibration in the present invention) is compared with a conventional dynamic vibration absorber having no folded shape. Body and the second vibrating body) can be reduced in rigidity. As a result, when designing a dynamic vibration absorber corresponding to a specific frequency, the dynamic vibration absorber in the present invention can be reduced in size as compared with the conventional dynamic vibration absorber (the dynamic vibration absorber is made compact). it can.

  Further, by using a dynamic vibration absorber having a folded shape, the first vibration body (and the second vibration body) has a primary mode in which the entire first vibration body (and the second vibration body) vibrates in the same phase. In addition to this vibration, other vibration modes (secondary mode, third mode,...) In which the portion of the first vibrating body (and the second vibrating body) from the folded portion mainly vibrates also occur. . Thereby, the vibration reducing member in the present invention can vibrate at a plurality of frequencies and reduce vibrations in a plurality of frequency ranges from the vibration device.

  Further, the first vibrating body (and the second vibrating body) are formed so as to be line symmetrical, and the first vibrating body and the second vibrating body are formed symmetrically so as to face each other. A torsional moment is less likely to occur at the line-symmetrical central portion of the vibrating body (and the second vibrating body) and at the connecting portion between the first vibrating body and the second vibrating body, and the vibration reducing object in which the vibration reducing member is disposed. Not affected by shape and dimensions. Therefore, the resonance frequency of the vibration absorbing unit can be set only by the size and shape of the vibration absorbing unit (the first vibrating body and the second vibrating body).

  That is, the vibration reducing member according to the present invention is a compact dynamic vibration absorber that can simultaneously reduce vibrations at a plurality of frequencies at the same installation position so that dynamic vibration absorbers corresponding to a plurality of frequencies from a vibration device do not interfere with each other. The vibration reducing member is provided.

  A second feature of the vibration reducing member according to the present invention is that the first vibrating body and the second vibrating body are connected to connect the peninsula-shaped notch provided in the plate-like body and the plate-like body. It is formed in the said plate-shaped body as a pair of notch part formed so that parts may oppose.

  According to this structure, a pair of notch provided in the plate-shaped body forms a dynamic vibration absorber. For this reason, it is not necessary to separately attach a vibration reducing member to the plate-like body. Therefore, the weight of the plate-like body is reduced, and since there are no convex objects on the surface of the plate-like body, it is easy to handle and space saving can be achieved.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. The vibration reducing member according to the present invention is, for example, a plate-like body that is in direct contact with a vibration source that is a component that rotates at high speed, such as a motor or a gear, used in a vibration device such as an AV (Audio Visual) device or a copy machine. Or a continuous body such as a plate-like body that receives vibration from the vibration source via an air medium (receives noise from the vibration source). More specifically, the vibration reducing member according to the present invention is disposed on a support member such as a bracket or a pedestal for supporting a part that rotates at high speed such as a cover such as an AV (Audio Visual) device or a copier, or a motor or a gear. Is.

  FIG. 1 is a schematic view showing a vibration reducing member 100 according to the prior art and a vibration reducing member 1 according to an embodiment of the present invention. Fig.1 (a) shows the vibration reduction member 100 which concerns on a prior art, FIG.1 (b) shows the vibration reduction member 1 which concerns on one Embodiment of this invention.

  As shown in FIG. 1B, the vibration reducing member 1 according to the present embodiment has a plate-like first shape formed so as to have a shape of one turn R1 and be symmetrical with respect to the center line S1. A vibrating body 2 and a plate-like second vibrating body 3 formed symmetrically with respect to the first vibrating body 2 so as to face the first vibrating body 2 in a direction orthogonal to the line symmetry direction, The first vibrating body 2 and the second vibrating body 3 form a pair of dynamic vibration absorbers. The first vibrating body 2 and the second vibrating body 3 are formed so as to be line symmetric with respect to the center line S2 of the vibration reducing member 1 orthogonal to the center line S1. On the other hand, as shown in FIG. 1 (a), the vibration reducing unit 100 according to the prior art provided with a dynamic vibration absorber does not have a folded shape.

  Here, the central portion of the vibration reducing member 1 is welded to a cover such as an AV (Audio Visual) device or a copy machine that is a target for vibration reduction, a bracket or a pedestal that supports a high-speed rotating part such as a motor or a gear, It is a part attached by a bolt, a pin, etc., and is described as a support part A. The first vibrating body 2 (or the second vibrating body 3) includes a plate-like portion 4 extending from the support portion A to one side, and is folded back about 180 ° from the tip of the plate-like portion 4 and extends to the support portion A side. The plate-like portion 4 and the plate-like portion 5 are formed so as to be adjacent to each other by cutting a rectangular plate-like member. A pair of dynamic vibration absorbers are formed by integrally or connecting the bases of the first vibrating body 2 and the second vibrating body 3 to each other. Examples of the material of the first vibrating body 2 (or the second vibrating body 3) include metal plates such as steel plates, stainless steel plates, aluminum plates, and copper plates, engineering plastics, and the like.

  Next, FIG. 2 is a figure which shows the response with respect to each frequency of each vibration reduction member (100, 1) shown in FIG. As analysis conditions, the lengths L0 of the vibration reducing member 100 and the vibration reducing member 1 are both 70 mm, and the width H1 is 40 mm. A dotted line in FIG. 2 is an analysis result of the vibration reduction member 100 according to the conventional technique, and a solid line is an analysis result of the vibration reduction member 1 according to the present embodiment.

  As shown in FIG. 2, by vibrating the vibration reducing member 100 and the vibration reducing member 1 at each frequency, only one peak P1 ′ (frequency effective in reducing vibration) appears in the vibration reducing member 100. In the vibration reducing member 1, two peaks P1 and P2 (frequency effective in reducing vibration) appear. The first peak P1 (primary mode) of the vibration reducing member 1 is due to a vibration mode in which the plate-like portion 4 and the plate-like portion 5 of the vibration reducing member 1 shown in FIG. The second peak P2 (secondary mode) is due to the vibration mode in which the plate-like portion 4 and the plate-like portion 5 of the vibration reducing member 1 shown in FIG. . That is, the vibration reduction member 100 according to the conventional technique can only deal with a specific frequency from the vibration device, but the vibration reduction member 1 according to the present embodiment corresponds to two frequencies from the vibration device. It is possible to reduce vibration.

  In the primary mode, the shaded portion D1 made up of the plate-like portion 4 and the plate-like portion 5 forms a dynamic vibration absorber made up of a spring and mass, and in the secondary mode, made up of the plate-like portion 5. The shaded portion D2 forms a dynamic vibration absorber made of a spring and mass. That is, the frequency of the primary mode depends on the length L1 and the width H1, and the frequency of the secondary mode depends on the length L2 and the width H2.

  Further, the peak P1 of the vibration reducing member 1 has a lower frequency than the peak P1 'of the vibration reducing member 100. As described above, the vibration reducing member 1 is formed by making a cut in the plate-like member so as to have a folded shape, and the rigidity of the vibration reducing member 1 is reduced by making the cut. It is lower than 100 stiffness. Therefore, the natural frequency of the vibration part (the first vibration body 2 and the second vibration body 3) of the vibration reduction member 1 becomes lower than the natural frequency of the vibration part of the vibration reduction member 100, and the peak P1 ′ of the vibration reduction member 100. The peak P1 of the vibration reducing member 1 has a lower frequency than that. Therefore, when designing a dynamic vibration absorber corresponding to a specific (one) frequency, the dynamic vibration absorber is made by increasing the length L1 or widening the tip width H1 as in the conventional design method. A dynamic vibration absorber having a low natural frequency can be made without increasing the frequency. That is, when designing a dynamic vibration absorber corresponding to a specific frequency, the vibration reduction member 1 according to the present embodiment is smaller in size than the vibration reduction member 100 according to the prior art (the dynamic vibration absorber is compact). Can).

  Further, the first vibrating body 2 (and the second vibrating body 3) is formed so as to be line-symmetric, and the first vibrating body 2 and the second vibrating body 3 are formed symmetrically so as to face each other. Therefore, a torsional moment is less likely to occur at the line-symmetrical central portion of the first vibrating body 2 (and the second vibrating body 3) and the connecting portion between the first vibrating body 2 and the second vibrating body 3, and the vibration reducing member 1 is There is no influence of the shape and size of the vibration reduction object to be arranged. Therefore, the resonance frequency of the vibration absorbing unit can be set only by the size and shape of the vibration absorbing unit (the first vibrating body 2 and the second vibrating body 3).

(First modification)
FIG. 3 is a schematic view showing a first modification of the vibration reducing member 1 shown in FIG. The main difference between the vibration reducing member 11 which is the first modified example of the vibration reducing member 1 shown in FIG. 3 and the vibration reducing member 1 shown in FIG. 1B is that the vibration reducing member 11 according to this modified example is By directly making cuts (cuts 16 and 17) into covers such as AV (Audio Visual) devices and copy machines that are subject to vibration reduction, brackets and mounts that support high-speed rotating parts such as motors and gears, etc. It is formed.

  As shown in FIG. 3, the first vibrating body 12 and the second vibrating body 13 in the vibration reducing member 11 according to the present modification are provided with a peninsula-shaped notch (16, 17) and the plate-like body 10 are formed in the plate-like body 10 as a pair of cut portions 18 formed so that the connecting portions B that connect the plate-like body 10 face each other. Thereby, a pair of cut part 18 provided in the plate-shaped body 10 forms a dynamic vibration absorber. For this reason, it is not necessary to separately attach a vibration reducing member to the plate-like body 10. That is, by forming the dynamic vibration absorber on the plate-like body 10 itself that is the object of vibration reduction, the weight of the plate-like body 10 is reduced, and since there are no convex objects on the surface of the plate-like body 10, it is easy to handle, and Space can be saved. In addition, in the modification shown below, the vibration reduction member formed by providing the notch part in the plate-shaped body 10 like this 1st modification is shown, but the vibration reduction shown in FIG.1 (b) is shown. Like the member 1, a vibration reducing member according to the following modification is formed of a plate-like member, and is rotated at a high speed such as a cover of an AV (Audio Visual) device or a copy machine, a motor, a gear, or the like that is a vibration reducing target. You may attach to a bracket, a stand, etc. which support components by welding, a bolt, a pin, etc.

Further, in the vibration reducing member 1 shown in FIG. 1B, the vibration reducing member 11 according to this modification, and the modification shown below, the vibration reducing member made of a plate material is shown. May be formed of a wire. When the vibration reducing member is formed using a plate material, the vibration reducing member is formed by punching the plate-like body 10 or the punched plate-like member. On the other hand, when forming a vibration reducing member using a wire, a vibration reducing member is formed by a linear member manufactured by casting or bending a wire, and this vibration reducing member is welded, bolted, pin, etc. Install by. Here, the plate material is suitable for a simple shape such as one turn. However, when designing a complicated shape such as a three-dimensional shape, the wire may be able to easily form a vibration reducing member by casting. .
Even if the vibration reducing member is formed of either a plate material or a wire material, the vibration of the vibration source (vibration reduction target) is suppressed, and instead the vibration reducing member vibrates. Since the wire material has lower sound radiation efficiency than the plate material, the vibration reducing member made of the wire material is characterized in that sound is not easily emitted even if the vibration reducing member itself vibrates.

(Second modification)
FIG. 4 is a schematic view showing second and third modifications of the vibration reducing member 1 shown in FIG. FIG. 4A shows a second modification, and FIG. 4B shows a third modification.

  First, a second modification of the vibration reducing member 1 will be described. As shown in FIG. 4A, the first vibrating body 22 and the second vibrating body 23 in the vibration reducing member 21 according to the present modification have a tip of the plate-like portion 4 on the side away from the support portion A 3. It is formed by cutting the plate-like body 10 so as to have a shape that is folded back by about 90 °.

  Thus, by using the first vibrating body 22 and the second vibrating body 23 having the shape of folding three times, the rigidity of the secondary mode of the vibration reducing member 21 can be lowered. As a result, the secondary mode Can be adjusted to a low frequency. For example, if the analysis is performed under the condition that the width H2 and the length L2 of the vibration reducing member 11 illustrated in FIG. 3 are equal to the width H2 and the length L2 of the vibration reducing member 21 according to this modification, 2 of the vibration reducing member 11 is obtained. The frequency of the secondary mode was 389 Hz, whereas the frequency of the secondary mode of the vibration reducing member 21 was 320 Hz. In addition, by using the first vibrating body 22 and the second vibrating body 23 having the shape of folding three times, the vibration reducing member 21 is also likely to generate natural vibration after the third-order mode. Further, the higher order mode appears more easily by increasing the number of times of folding.

(Third Modification)
Next, a third modification will be described. As shown in FIG. 4B, the first vibrating body 32 and the second vibrating body 33 in the vibration reducing member 31 according to the present modification are arranged so that the tip of the plate-like portion 4 on the side away from the support portion A is 2 It is formed by cutting the plate-like body 10 so as to have a shape that is folded back outward in a shape of about 180 ° strip. According to this shape, compared with the vibration reducing member 21 shown in FIG. 4A, the folded tip C is disposed on the outside, so that the lengths L2 and L3 can be easily changed. As a result, the frequency of each mode It becomes easy to adjust. Further, the length L3 of the vibration reducing member 31 according to the present modification is longer than the length L3 of the vibration reducing member 21, and there is an advantage that a tertiary mode is easily generated. Note that the lengths L2 and L3 need not be equal. On the other hand, the vibration reduction member 21 shown in FIG. 4 (a) has a much lower frequency in the secondary mode than the vibration reduction member 31 according to this modification, although the frequency in the primary mode is not much different. To do. That is, the design of the vibration reducing member 21 is easier when the two frequencies for vibration reduction are close.

(Fourth modification)
FIG. 5 is a schematic view showing fourth and fifth modifications of the vibration reducing member 1 shown in FIG. FIG. 5A shows a fourth modification, and FIG. 5B shows a fifth modification. FIG. 6 is a schematic diagram illustrating an arrangement example of the vibration reducing member 41 illustrated in FIG.

  First, the 4th modification of the vibration reduction member 1 is demonstrated. As shown in FIG. 5 (a), the first vibrating body 42 and the second vibrating body 43 in the vibration reducing member 41 according to the present modification are approximately the tip of the plate-like portion 4 on the side away from the support portion A. A total of two folded end portions E are cut into the plate-like body 10 so as to be adjacent to the end portion F on the side that is symmetrical with respect to the center line S1 in order of 90 ° once and about 180 ° once. It is formed by putting. This modification is an effective example when the width H2 can be widened in space. For example, as shown in FIG. 6, when the vibration reduction member 41 according to this modification is used, the vibration reduction member 41 A plurality of vibration reducing members 41 can be arranged by alternately switching the directions.

(5th modification)
Next, a fifth modification will be described. As shown in FIG. 5 (b), the vibration reducing member 51 according to this modification is obtained by connecting the end E and the end F of the vibration reducing member 41 shown in FIG. 5 (a). By connecting the end portion E and the end portion F, the mode vibration of the opposite phase between the end portion E and the end portion F disappears, and stable beam vibration can be obtained.

(Sixth Modification)
FIG. 7 is a schematic view showing sixth and seventh modifications of the vibration reducing member 1 shown in FIG. FIG. 7A shows a sixth modification, and FIG. 7B shows a seventh modification.

  First, a sixth modification of the vibration reducing member 1 will be described. As shown in FIG. 7A, the vibration reducing member 61 according to this modification is separated from the support portion A of the first vibrating body 42 and the second vibrating body 43 in the vibration reducing member 41 shown in FIG. It is formed so that the other side is further folded. Similar to the vibration reducing member 41, this is an effective example when the width H2 can be wide in space. Further, since there are more turns than the vibration reducing member 41, higher-order mode vibration is likely to occur, and the vibration reducing member 61 corresponding to a large number of frequencies is obtained.

(Seventh Modification)
Next, a seventh modification will be described. As shown in FIG. 7B, the length L1 of the plate-like portion 4 of the vibration reducing member 71 according to this modification is the length L1 of the plate-like portion 4 of the vibration reducing member 61 shown in FIG. Longer than. Thereby, the frequency of the primary mode of the vibration reducing member 71 can be made lower than the frequency of the primary mode of the vibration reducing member 61.

(Eighth modification)
FIG. 8 is a schematic view showing an eighth modification of the vibration reducing member 1 shown in FIG. As shown in FIG. 8, the first vibrating body 82 and the second vibrating body 83 in the vibration reducing member 81 according to the present modification are triangular cut portions. That is, the cuts for forming the first vibrating body and the second vibrating body are not limited to a right-angled cut (rectangular cut) as in the modifications described so far. According to the vibration reducing member 81 according to the present modification, the length L2 of the first vibrating body 82 and the second vibrating body 83 in the vibration reducing member 71 can be increased in space compared to the respective modifications. Vibration in the next mode is likely to occur.

(Ninth Modification)
FIG. 9 is a schematic view showing ninth and tenth modifications of the vibration reducing member 1 shown in FIG. FIG. 9A shows a ninth modification, and FIG. 9B shows a tenth modification.

  First, a ninth modification of the vibration reducing member 1 will be described. As shown in FIG. 9A, the first vibrating body 92 and the second vibrating body 93 in the vibration reducing member 91 according to this modification have a plurality of tips on the side away from the support portion A in the plate-like portion 4. It is formed by cutting the plate-like body 10 so as to have a shape that is folded back in a strip shape toward the support portion A side about 180 °. According to this shape, vibration is easily transmitted to each strip-shaped portion after being folded. Therefore, the vibration reducing member 91 according to the present modification is more likely to generate vibrations in the higher order modes after the third order mode, and enables vibration reduction at a large number of frequencies.

(10th modification)
Next, a tenth modification will be described. As shown in FIG. 9B, the first vibrating body 92 ′ and the second vibrating body 93 ′ in the vibration reducing member 91 ′ according to this modification are the same as those in the vibration reducing member 91 shown in FIG. The ends of the first vibrating body 92 and the second vibrating body 93 on the side away from the support portion A are recessed (a linear recess formed from an arc surface in a direction perpendicular to the center line S1 in the plate-like body 10). 99 is provided). Thereby, the rigidity of the edge part on the side away from the support part A of 1st vibrating body 92 'and 2nd vibrating body 93' increases. By increasing the rigidity, vibration is easily transmitted to each strip-shaped portion after being folded. As a result, the vibration reducing member 91 according to the present modification can reduce vibrations at a larger number of frequencies.

(11th to 18th modifications)
FIGS. 10-13 is the schematic which shows the 11th-18th modification of the vibration reduction member 1 shown in FIG.1 (b). 10 (a) is an eleventh modification, FIG. 10 (b) is a twelfth modification, FIG. 11 (a) is a thirteenth modification, FIG. 11 (b) is a fourteenth modification, and FIG. FIG. 12B shows a fifteenth modification, FIG. 13A shows a seventeenth modification, and FIG. 13B shows an eighteenth modification.

  A vibration reducing member 11 ′, which is an eleventh modified example shown in FIG. 10A, is a support that is the central portion of the vibration reducing member 1 in the vibration reducing member 11 according to the first modified example shown in FIG. Two plate-like portions 4 extending from the portion A to one side are respectively provided on the first vibrating body 12 ′ and the second vibrating body 13 ′ so as to be line-symmetric with respect to the center line S1 (plate-like portion 4 ′). It is provided. Other shapes of the vibration reducing member 11 ′ are the same as those of the vibration reducing member 11 shown in FIG. Note that the twelfth to eighteenth modification examples shown in FIGS. 10B to 13 are the vibration reduction member 11 according to the first modification example, in order to the second to eighth modification examples shown in FIGS. Is deformed in the same manner as the vibration reducing member 11 ′ according to the eleventh modification, and the description thereof is omitted.

(Arrangement example of vibration reducing member)
Next, an example in which a plurality of vibration reducing members 21 shown in FIG. 4B are arranged on the plate-like body 10 to form a sound insulating plate will be described. FIG. 14 is a layout view in which a plurality of vibration reducing members 21 shown in FIG.

  The vibration reducing member α shown in FIG. 14 has the dimensions of the vibration reducing member 21 shown in FIG. 4B, the fundamental frequency f of the noise from the vibration device, the frequency 2f twice the fundamental frequency, and the fundamental. The vibration reducing member is determined to correspond to the next three times the frequency 3f. Further, the vibration reducing member β is a vibration reducing member in which the dimensions of the vibration reducing member 21 are determined so as to correspond to the frequency 2f that is twice the basic order and the frequency 3f that is three times the basic order. The vibration reducing member γ is a conventional vibration reducing member corresponding to a specific frequency, and each dimension is determined so as to correspond to a frequency that is three times the basic order. A plurality of vibration reducing members α, vibration reducing members β, and vibration reducing members γ are formed by cutting the plate-like body 10 (arranged in the plate-like body 10). By arranging the vibration reducing member α, the vibration reducing member β, and the vibration reducing member γ on the plate-like body 10, the plate-like body 10 serves as a sound insulation plate that insulates noise from the vibration device.

  Here, as shown in FIG. 14, the vibration reducing member α is ¼ of the wavelength λ of the fundamental bending wave in which bending deformation generated in the plate-like body 10 is transmitted in an oblique direction with respect to the plate-like body 10. They are arranged at wavelength intervals. A vibration reduction member β and a vibration reduction member γ corresponding to harmonic vibration are arranged between the vibration reduction members α arranged at quarter wavelength intervals. The primary mode of the vibration reducing member α prevents fundamental noise, the secondary mode of the vibration reducing member α and the primary mode of vibration reducing member β prevent secondary (2f) noise, and the vibration reducing member α The tertiary mode, the secondary mode of the vibration reducing member β, and the primary mode of the vibration reducing member γ prevent third order (3f) noise. In the present arrangement example, the vibration reducing members α are arranged in the diagonal direction at quarter wavelength intervals, but the arrangement direction of the vibration reducing members α may be any direction, either the vertical direction or the horizontal direction. In order to prevent interference between the vibration reducing members α, an arrangement in an oblique direction with less interference is preferable. Further, in this arrangement example, the vibration reducing member α is arranged at a quarter wavelength interval of the basic bending wave generated in the plate-like body 10, but the arrangement interval of the vibration reducing member α is set to this interval. It is not limited.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

  For example, FIG. 15 is a schematic view showing another modification of the vibration reducing member 1 shown in FIG. A vibration reducing member 21 ″ shown in FIG. 15A is a further modification of the vibration reducing member 21 according to the second modification shown in FIG. 4A, and the vibration reducing member 31 shown in FIG. 15B. ″ Is a further modification of the vibration reducing member 31 according to the third modification shown in FIG. As shown in FIGS. 15 (a) and 15 (b), by further increasing the number of times of folding, not only the secondary and tertiary modes that are effective in reducing vibrations, but also the fourth and subsequent high modes that are effective in reducing vibrations. Larger vibrations of the next mode can be generated.

It is the schematic which shows the vibration reduction member which concerns on a prior art, and the vibration reduction member which concerns on one Embodiment of this invention. It is a figure which shows the response with respect to each frequency of each vibration reduction member shown in FIG. It is the schematic which shows the 1st modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 2nd, 3rd modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 4th, 5th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the example of arrangement | positioning of the vibration reduction member shown to Fig.5 (a). It is the schematic which shows the 6th, 7th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 8th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 9th, 10th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 11th, 12th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 13th, 14th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 15th, 16th modification of the vibration reduction member shown in FIG.1 (b). It is the schematic which shows the 17th, 18th modification of the vibration reduction member shown in FIG.1 (b). FIG. 5 is a layout view in which a plurality of vibration reducing members 21 shown in FIG. It is the schematic which shows the other modification of the vibration reduction member shown in FIG.1 (b).

Explanation of symbols

1: Vibration reducing member 2: First vibrating body 3: Second vibrating body 10: Plate-like body 16, 17: Cut portion 18: A pair of cut portions

Claims (2)

A first vibrating body having a folded shape and being line-symmetrical;
A second vibrating body formed symmetrically with respect to the first vibrating body so as to face the first vibrating body in a direction orthogonal to the line symmetric direction,
A vibration reducing member, wherein the first vibrating body and the second vibrating body form a pair of dynamic vibration absorbers. The first vibrating body and the second vibrating body are formed as a pair of cut portions formed so that connecting portions connecting the peninsula-shaped cut portion provided in the plate-like body and the plate-like body face each other. The vibration reducing member according to claim 1, wherein the vibration reducing member is formed in a plate-like body.

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