CN117079632A - Acoustic black hole structure and acoustic black hole assembly - Google Patents
Acoustic black hole structure and acoustic black hole assembly Download PDFInfo
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- CN117079632A CN117079632A CN202310937115.2A CN202310937115A CN117079632A CN 117079632 A CN117079632 A CN 117079632A CN 202310937115 A CN202310937115 A CN 202310937115A CN 117079632 A CN117079632 A CN 117079632A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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Abstract
The invention provides an acoustic black hole structure, comprising: the device comprises a bottom beam, a first structural member, a second structural member, an elastic plate and a mass block; the bottom beam is used for being fixed with the external supporting piece; the first structural member is fixed on one side of the upper surface of the bottom beam, and the second structural member is fixed on the other side of the upper surface of the bottom beam through an elastic member; the upper surface of the first structural member is provided with a first curved groove which is concave towards the bottom beam; a pair of second curved grooves which are concave inwards are formed in two ends of the y axis of the second structural member, so that the second structural member is of a vertically arranged hourglass-shaped structure; the first curved groove and the two second curved grooves form three acoustic black holes; one part of the elastic plate in the length direction is fixed on the upper end surface of the second structural member, the other part of the elastic plate is arranged in a suspended manner and is positioned above the first curved groove, and the mass block is fixed on one side, far away from the second structural member, of the elastic plate; the second structural member is higher than the top end of the first structural member; the invention can effectively restrain low-frequency vibration.
Description
Technical Field
The invention relates to the technical field of steel structure engineering, in particular to an acoustic black hole structure and an acoustic black hole assembly.
Background
In celestial physics, black holes form when the mass density reaches a sufficient level and collapses to a "singular point". The black holes possess such a striking attraction that any substance, even light, cannot escape the attraction of the black hole boundary.
According to the black hole teaching in astrophysics, physicists propose an acoustic black hole, which is cut by power law to form a wave control structure with gradual impedance, and the phase velocity and the group velocity of the elastic wave change due to gradual impedance change and gradually decrease, and ideally decrease to 0, so that the elastic wave cannot propagate to the edge and no reflection occurs, thereby generating a bending wave gathering effect, forming a high-energy density region, and simply speaking, the acoustic black hole is similar to the astronomical black hole, and can absorb sound waves, so that the acoustic black hole cannot escape. Therefore, the acoustic black hole is widely applied to the fields of civil engineering, geotechnical engineering, bridge and tunnel engineering and steel structure engineering and is used for absorbing sound waves so as to achieve the vibration reduction effect.
When the vibration wave of sound wave propagates on the medium, the higher the frequency is, the shorter the wavelength is, the faster the energy attenuation is, and the less hazard is formed, so the hazard of high-frequency vibration can be effectively reduced by utilizing the acoustic black hole. However, the lower the frequency, the longer the wavelength, the slower the energy attenuation during propagation and the greater the hazard formed, so in order to reduce the hazard of vibration, low frequency vibration should be suppressed as a main factor. While conventional acoustic black holes tend to effectively suppress high frequency sound waves, there is a continuing need for improved acoustic black holes if low frequency vibrations are to be suppressed.
Disclosure of Invention
The invention solves the problems that: the acoustic black hole structure and the acoustic black hole assembly are specially applied to the field of steel structure engineering, are simple in structure and reasonable in design, and can effectively inhibit low-frequency vibration.
In order to solve the above problems, the present invention provides an acoustic black hole structure, comprising:
the device comprises a bottom beam, a first structural member, a second structural member, an elastic plate and a mass block; the length direction of the bottom beam is coaxially arranged with the y axis and is used for being fixed with an external supporting piece;
the first structural member is fixed on one side of the upper surface of the bottom beam, and the second structural member is fixed on the other side of the upper surface of the bottom beam through an elastic member;
the upper surface of the first structural member is provided with a first curved groove which is concave towards the bottom beam; a pair of second curved grooves which are concave inwards are formed in two ends of the second structural member in the y-axis direction, so that the second structural member is of a vertically arranged hourglass-shaped structure; the first curved groove and the two second curved grooves form three acoustic black holes;
one part of the elastic plate in the length direction is fixed on the upper end surface of the second structural member, and the other part is suspended; the mass block is fixed on one side of the elastic plate, which is far away from the second structural member; the second structural member, the elastic plate and the mass block form an inertia amplifying mechanism for increasing the moving mass of the mass block;
the groove bottom curves h (x) of the first curved groove and the two second curved grooves satisfy the following expression:
wherein L represents the linear distance between two ends of the bottom of the groove in the length direction; for the first structural member, representing the linear distance from the bottom of the first structural member to the top end of the first curved groove; for the second structural member, the straight line distance from the central line S on the second structural member to the top end of the second curved groove is represented; for the first structural member, representing the linear distance from the bottom of the first curved groove to the bottom of the first structural member; for the second structural member, the linear distance from the bottom of the second curved groove to the central line S is represented; is a function argument.
The invention has the beneficial effects that the first curved groove and the two second curved grooves form three acoustic black holes, the gradient decrease can be carried out after the sound wave is absorbed at the same time, the conduction band of the sound wave is enlarged by arranging a plurality of acoustic black holes on one structure, the high-frequency band gap is reduced by the additional vibrator structure, the low-frequency band gap is enlarged, and further the low-frequency vibration is effectively restrained; the second structural member, the elastic plate and the mass block form an inertial amplifying device for amplifying the moving mass of the mass block to generate a wide band gap, when sound wave vibration occurs, the second structural member serving as a vibrator structure can vibrate, the elastic plate and the mass block belong to a further additional vibrator structure, so that the second structural member vibrates to drive the elastic plate to vibrate, the elastic plate vibrates to drive the mass block to vibrate, the vibration of the mass block can enable the moving mass of the whole vibrator structure to increase, the mass block is fixed on one side, far away from the second structural member, of the elastic plate so that the arm length from the mass block to the elastic member is maximum, and the larger the vibrator mass and the arm length ratio are, the smaller the resonance frequency is, the high-frequency band gap of the whole structure is reduced accordingly, the low-frequency band gap is enlarged, and the low-frequency vibration can be effectively inhibited.
Further, damping pieces are arranged on the bottoms of the first curved groove and the second curved groove.
The beneficial effect of this setting is, can dispel the ability of acoustic black hole central zone, suppresses the propagation of bending wave to better suppression low frequency vibration.
Further, the first structural member comprises a first sub-structural member and a second sub-structural member, and an integrated first curve-shaped groove is formed between the first sub-structural member and the second sub-structural member; the first sub-structure is made of a rigid metallic material and the second sub-structure is made of a rigid non-metallic material.
The beneficial effect of this setting is, first sub-structure spare and second sub-structure spare are owing to the material is obvious different, leads to the conduction of sound wave to produce different refraction and reflection owing to the medium is different, forms impedance mismatch to obtain the wide band gap in low frequency range, and then effectively control the vibration in this band gap frequency range.
Further, the first sub-structure is made of aluminum and the second sub-structure is made of PMMA.
The beneficial effect that this setting is, first sub-structure adopts aluminium, and the second sub-structure adopts PMMA, and first sub-structure and second sub-structure material are different under this kind of circumstances, lead to the conduction of sound wave because the medium is different to produce different refraction and reflection, form impedance mismatch to obtain the wide band gap in low frequency range, and then effectively control the vibration in this band gap frequency range.
Further, the elastic member is an epoxy resin.
The beneficial effect of this setting is, there is certain elasticity after the epoxy solidification for the second structure both can effectively fix on the floorbar, does not also influence its normal vibration.
Further, the two groove tops of the first curved groove are arranged in a flush manner; the two groove tops of the second curved groove are arranged flush.
The beneficial effect of this setting is for the acoustics black hole opening part structure on first curved groove and the second curved groove is comparatively even, can fully absorb the sound wave and evenly attenuate, can not appear a high one low the condition that leads to absorbing inhomogeneous.
Further, the device also comprises a pair of vertically arranged supporting pieces; a supporting surface is formed between the suspension part of the elastic plate and the upper end surface of the second structural member; the lower ends of the two supporting pieces are fixed on the side wall of the bottom beam, and the upper ends of the two supporting pieces are positioned on two sides of the supporting surface and are fixed with the elastic plate to form a support.
The beneficial effect of this setting is, guarantees the intensity of elastic plate, makes it be difficult to take place the rupture.
Further, the mass is made of lead; the bottom beam is made of steel; the second structural member, the elastic plate and the supporting member are all made of aluminum.
The lead mass block has the beneficial effects that the lead mass block can effectively move to change the moving mass; the steel bottom beam can ensure the strength; the second structural member, the elastic plate and the supporting piece of aluminum can ensure strength, and the elastic plate of aluminum has better elasticity.
Further, the length direction of the elastic plate is parallel to the length direction of the bottom beam, the elastic plate is arranged right above the bottom beam, and the mass block is arranged right above the first curved groove.
The beneficial effect of this setting is, this structure makes whole structure volume minimum, is favorable to the installation.
The invention also provides an acoustic black hole structure assembly, according to the acoustic black hole structure, a plurality of bottom beams are arranged coaxially with the y axis, and each bottom beam is integrally formed along the y axis; each bottom beam is provided with a first structural member, a second structural member, an elastic plate, a mass block, a first curved groove and a second curved groove.
The beneficial effect of this setting is for this acoustic black hole can form a set of to fix on the external support piece and effectively work.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram of a plurality of the present invention in use, with the head and tail connected in a group;
FIG. 3 is a schematic diagram of parameters of a curve function h (x) according to the present invention;
reference numerals illustrate:
1-bottom beam, 2-first structural member, 2.1-first sub-structural member, 2.2-second sub-structural member, 3-second structural member, 4-elastic member, 5-elastic plate, 6-mass block, 7-supporting member, 8-damping member, 21-first curved slot, 31-second curved slot, 53-supporting surface, S-center line.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., are based on directions or positional relationships shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. In the embodiment of the invention, the coordinate system xyz is provided in fig. 1, wherein the forward direction of the x axis represents the front, the backward direction of the x axis represents the rear, the forward direction of the y axis represents the right, the backward direction of the y axis represents the left, the forward direction of the z axis represents the upper, and the backward direction of the z axis represents the lower. The coordinate system in fig. 3 is not a position coordinate system, but a function coordinate system of a curve function h (x), so that the description of the azimuth or position relationship in the present invention is based on the coordinate system in fig. 1.
In addition, it should be noted that the invention has better effect in the low-frequency wide band gap range of 1Hz-300 Hz. As shown in fig. 1, the second structural member 3 is provided with a central line S, where the central line S bisects the second structural member 3 into two symmetrical structural members, and the two symmetrical structural members each use S as a bottom edge, so that the bottom edges S of the two symmetrical structural members on the second structural member 3 can be overlapped with the x-axis of the function coordinate system in fig. 3, and further, the curve function h (x) can correspond to the bottom curve of the second curve groove 31, so that it can be easily seen that, when the curve function h (x) is applied to the second structural member 3, the straight line distance from the central line S to the top end of the second curve groove 31 is the straight line distance.
The present embodiment provides an acoustic black hole structure, including:
a bottom beam 1, a first structural member 2, a second structural member 3, an elastic member 4, an elastic plate 5 and a mass block 6; the length direction of the bottom beam 1 is coaxially arranged with the y axis and is used for being fixed with an external supporting piece;
the first structural member 2 is fixed on one side of the upper surface of the bottom beam 1, and the second structural member 3 is fixed on the other side of the upper surface of the bottom beam 1 through an elastic member 4;
the upper surface of the first structural member 2 is provided with a first curved groove 21 which is concave towards the bottom beam 1; a pair of second curved grooves 31 which are concave inwards are formed at two ends of the second structural member 3 in the y axis direction, so that the second structural member 3 is of a vertically arranged hourglass-shaped structure; the first curved groove 21 and the two second curved grooves 31 form three acoustic black holes;
one part of the elastic plate 5 in the length direction is fixed on the upper end surface of the second structural member 3, and the other part is suspended; the mass block 6 is fixed on one side of the elastic plate 5 far away from the second structural member 3; the second structural member 3, the elastic member 4, the elastic plate 5 and the mass block 6 form an inertial amplification mechanism for increasing the moving mass of the mass block 6;
the groove bottom curves h (x) of the first curved groove 21 and the two second curved grooves 31 satisfy the following expression:
wherein L represents the linear distance between two ends of the bottom of the groove in the length direction; for the first structural member2，h 0 Representing the linear distance from the bottom of the first structural member 2 to the top of the first curved slot 21; for the second structural member 3, h 0 Representing the linear distance from the centerline S on the second structural member 3 to the top of the second curved slot 31; for the first structural member 2,h t Representing the linear distance from the bottom of the first curved groove 21 to the bottom of the first structural member 2; for the second structural member 3, h t Representing the linear distance from the bottom of the second curved groove 31 to the center line S; x is a function argument.
Specifically, the top end of the second curved groove 31 refers to the end of the second curved groove 31 that is open in the y-axis direction; the bottom beam 1 is of a strip-shaped cuboid structure, the first structural member 2 and the second structural member 3 are of plate-shaped structures, the first structural member 2 and the second structural member 3 are vertically arranged, the bottom surface of the first structural member 2 is fixedly arranged on the upper surface of the bottom beam 1, the bottom surface of the second structural member 3 is fixedly arranged on the upper surface of the bottom beam 1 through an elastic member 4, and the contact surface sizes of the first structural member 2 and the second structural member 3 and the bottom beam 1 are consistent; the bottom beam 1, the first structural member 2 and the second structural member 3 of the structure can form a firm structure and have high strength; when the second structural member 3 is higher than the top end of the first structural member 2, the height of the second structural member 3 is not less than one third of the height of the first structural member 2, so that the elastic plate 5 can have enough vibration space; the height of the mass block 6 is not more than five times the thickness of the elastic plate 5, so that the mass block 6 cannot be excessively heavy to fracture the elastic plate 5; the length of the elastic plate 5 is not more than three fourths of the length of the bottom beam 1; the length direction of the elastic plate 5 is consistent with the length direction of the bottom beam 1 and is arranged in parallel, the elastic plate 5 is arranged right above the bottom beam 1, and the mass block 6 is arranged right above the first curved groove 21; the upper end surface of the second structural member 3 is higher than the top end of the first structural member 2; the first curved groove 21 and the two second curved grooves 31 form three acoustic black holes, so that the sound waves can be absorbed at the same time and then subjected to gradient decreasing, and the high-frequency band gap is reduced, the low-frequency band gap is enlarged, and further the low-frequency vibration is effectively restrained by arranging a plurality of acoustic black holes on one structure; on the other hand, the second structural member 3, the elastic member 4, the elastic plate 5 and the mass block 6 form an inertial amplifying device for amplifying the moving mass of the mass block 6 to generate a wide band gap, when the acoustic wave vibration occurs, the second structural member 3 as a vibrator structure vibrates, since the elastic plate 5 and the mass block 6 belong to a further additional vibrator structure, the second structural member 3 vibrates to drive the elastic plate 5 to vibrate, the elastic plate 5 vibrates to drive the mass block 6 to vibrate, the vibration of the mass block 6 can increase the moving mass of the whole vibrator structure, and the mass block 6 is fixed on one side of the elastic plate 5 far from the second structural member 3 to maximize the arm length from the mass block 6 to the elastic member 5, according to the following formula of the vibrator resonance frequency f:
wherein k is the rigidity of the elastic piece, R is the arm length ratio, R=b/c, m t The weight is the mass, c is the arm length from the supporting surface of the elastic plate to the elastic piece, and b is the arm length from the mass to the elastic piece; it can be seen that the larger the mass of the mass block and the arm length ratio is, the smaller the resonance frequency f is, so that the high-frequency band gap of the whole structure is also reduced, the low-frequency band gap is further enlarged, and the low-frequency vibration can be effectively restrained.
Further, the specific dimensions of the present invention may be that the length of the bottom beam 1 is 2m, the width is 0.3m, the height is 0.1m, the length of the first structural member 2 is 1.6m, the height is 1m, the distance from the bottom of the first curved groove 21 to the bottom of the first structural member 2 is 0.02m, the height of the elastic member 4 is 0.1m, the height of the second structural member 3 is 1m, the length of the elastic plate 5 is 1.35m, the thickness is 0.05m, and the height of the mass block 6 is 0.25 m; at this size, a complete band gap is generated in the band gap frequency ranges of 0-2.94Hz, 9.85-13.04Hz, 55.18-85.35Hz, 140.15-183.22Hz and 202.25-283.3Hz, that is, a band gap of about 53.5% is generated in the low frequency range of 300Hz, thereby effectively controlling the low frequency vibration.
In the preferred embodiment of the present invention, the damping member 8 is provided on the bottoms of both the first curved groove 21 and the second curved groove 31.
Specifically, the material density of the damping member 8 was 950kg/m 3 Elastic modulus is 5GPa, poisson ratio is 0.3, covering thickness is 0.01m, coveringThe length is one half of the curve length of the tank bottom and is arranged in the middle of the tank bottom.
In the preferred embodiment of the invention, the first structural member 2 comprises a first sub-structural member 2.1 and a second sub-structural member 2.2, and the first sub-structural member 2.1 and the second sub-structural member 2.1 together form an integral first curved groove 21; the first sub-structure 2.1 is made of a rigid metallic material and the second sub-structure 2.2 is made of a rigid non-metallic material.
Specifically, in steel structure engineering, the acoustic black hole is often made of steel materials, and the problem of insufficient strength caused by using other nonmetallic materials is caused, so that the person skilled in the art can hardly think that the acoustic black hole is made of nonmetallic materials; the first sub-structural member 2.1 is fixed on the bottom beam 1 by welding, and the second sub-structural member 2.2 is fixed on the bottom beam 1 by gluing; the first sub-structural member 2.1 and the second sub-structural member 2.2 are obviously different in material, so that the conduction of sound waves generates different refraction and reflection due to different media, impedance mismatch is formed, a wide band gap in a low frequency range is obtained, and vibration in the band gap frequency range is effectively controlled.
In a preferred embodiment of the invention, the first sub-structure 2.1 is made of aluminum and the second sub-structure 2.2 is made of PMMA.
Specifically, the first sub-structural member 2.1 adopts aluminum, the second sub-structural member 2.2 adopts PMMA, and in this case, the materials of the first sub-structural member 2.1 and the second sub-structural member 2.2 are obviously different, so that the conduction of sound waves generates different refraction and reflection due to different media to form impedance mismatch, thereby obtaining a wide band gap in a low frequency range and further effectively controlling the vibration in the band gap frequency range.
In a preferred embodiment of the invention, the elastic member 4 is an epoxy resin.
Specifically, the epoxy resin has certain elasticity after being cured, so that the second structural member 3 can be effectively fixed on the bottom beam 1, and the normal vibration of the second structural member is not affected.
In the preferred embodiment of the invention, the two groove tops of the first curvilinear groove 21 are disposed flush; the two groove tops of the second curved groove 31 are arranged flush.
Specifically, the opening structure of the first curved slot 21 is flush along the horizontal direction of the y axis, and the opening structure of the second curved slot 31 is flush along the vertical direction of the z axis, so that the sound wave can be fully absorbed and uniformly attenuated, the situation that the sound wave is high and low is avoided, the absorption is uneven, and the attenuation of the sound wave is affected.
In a preferred embodiment of the invention, a pair of vertically disposed supports 7 are also included; a supporting surface 53 is formed between the suspended part of the elastic plate 5 and the upper end surface of the second structural member 3; the lower ends of the two supporting pieces 7 are fixed on the side wall of the bottom beam 1, and the upper ends are positioned on two sides of the supporting surface 53 and are fixed with two sides of the elastic plate 5 to form a support.
Specifically, the upper ends of the two supporting pieces 7 are fixed with the outer side walls of the two sides of the width direction of the elastic plate 5, the supporting pieces 7 can support the elastic plate 5, and the supporting pieces 7 can ensure the strength of the elastic plate 5 because the elastic plate 5 can vibrate, so that the supporting surface 53 of the elastic plate 5 is not easy to break.
In a preferred embodiment of the invention, the mass 6 is made of lead; the bottom beam 1 is made of steel; the second structural member 3, the elastic plate 5 and the support 7 are all made of aluminum.
Specifically, the lead mass 6 can effectively move to change the moving mass, and the mass 6 can also be made of other high-density materials; the steel bottom beam 1 can ensure the strength; the second structural member 3, the elastic plate 5 and the supporting member 7 of aluminum can ensure strength, and the elastic plate 5 of aluminum has better elasticity.
In a possible embodiment of the present invention, an acoustic black hole structure assembly is further provided, according to one of the acoustic black hole structures described in the foregoing embodiments, in this embodiment, the plurality of bottom beams 1 are all coaxially disposed with the y-axis, and each bottom beam 1 is integrally formed along the y-axis; each bottom beam 1 is provided with a first structural member 2, a second structural member 3, an elastic member 4, an elastic plate 5, a mass block 6, a first curved groove 21 and a second curved groove 31. According to the embodiment, the acoustic black hole structures in the above embodiments can be integrally formed to form a group, and when the size or length of the external support piece to be fixed is relatively large, a better effect can be achieved by adopting the embodiment. The number of acoustic black hole structures in a set of acoustic black hole structure assemblies can be flexibly adjusted by a person skilled in the art according to practical situations.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. An acoustic black hole structure, comprising:
the device comprises a bottom beam (1), a first structural member (2), a second structural member (3), an elastic member (4), an elastic plate (5) and a mass block (6); the length direction of the bottom beam (1) is coaxially arranged with the y axis and is used for being fixed with an external supporting piece;
the first structural member (2) is fixed on one side of the upper surface of the bottom beam (1), and the second structural member (3) is fixed on the other side of the upper surface of the bottom beam (1) through the elastic member (4);
the upper surface of the first structural member (2) is provided with a first curved groove (21) which is concave towards the bottom beam (1); a pair of second curved grooves (31) which are concave inwards are formed in two ends of the second structural member (3) in the y-axis direction, so that the second structural member (3) is of a vertically arranged hourglass-shaped structure; the first curved grooves (21) and the two second curved grooves (31) form three acoustic black holes;
one part of the elastic plate (5) in the length direction is fixed on the upper end surface of the second structural member (3), and the other part is suspended; the mass block (6) is fixed on one side of the elastic plate (5) away from the second structural member (3); the second structural member (3), the elastic member (4), the elastic plate (5) and the mass block (6) form an inertia amplifying mechanism for increasing the moving mass of the mass block (6);
the groove bottom curves h (x) of the first curved groove (21) and the two second curved grooves (31) satisfy the following expression:
wherein L represents the linear distance between two ends of the bottom of the groove in the length direction; for the first structural member (2), h 0 Representing a linear distance from the bottom of the first structural member (2) to the top of the first curved groove (21); for the second structural member (3), h 0 Representing the linear distance from the central line S on the second structural member (3) to the top end of the second curved groove (31); for the first structural member (2), h t Representing a linear distance from the bottom of the first curved groove (21) to the bottom of the first structural member (2); for the second structural member (3), h t Representing the linear distance from the bottom of the second curved groove (31) to the central line S; x is a function argument.
2. An acoustic black hole structure according to claim 1, wherein damping members (8) are arranged on the bottoms of the first curved groove (21) and the second curved groove (31).
3. An acoustic black hole structure according to claim 1 or 2, wherein the first structural member (2) comprises a first sub-structural member (2.1) and a second sub-structural member (2.2), the first sub-structural member (2.1) and the second sub-structural member (2.1) together forming the first curved groove (21) in one piece; the first sub-structural member (2.1) is made of a rigid metallic material and the second sub-structural member (2.2) is made of a rigid non-metallic material.
4. An acoustic black hole structure according to claim 3, wherein the first sub-structure (2.1) is made of aluminium and the second sub-structure (2.2) is made of PMMA.
5. An acoustic black hole structure according to claim 1, 2 or 4, wherein the resilient member (4) is an epoxy.
6. An acoustic black hole structure according to claim 1, 2 or 4, wherein the two groove tops of the first curvilinear groove (21) are arranged flush; the two groove tops of the second curved groove (31) are arranged in a flush manner.
7. An acoustic black hole structure according to claim 1, 2 or 4, further comprising a pair of vertically arranged supports (7); a supporting surface (53) is formed between the suspended part of the elastic plate (5) and the upper end surface of the second structural member (3); the lower ends of the two supporting pieces (7) are fixed on the side wall of the bottom beam (1), and the upper ends of the two supporting pieces are positioned on two sides of the supporting surface (53) and are fixed with the elastic plate (5) to form a support.
8. An acoustic black hole structure according to claim 7, wherein the mass (6) is made of lead; the bottom beam (1) is made of steel; the second structural member (3), the elastic plate (5) and the supporting member (7) are all made of aluminum.
9. An acoustic black hole structure according to claim 1, 2, 4 or 8, wherein the length direction of the elastic plate (5) is arranged in parallel with the length direction of the bottom beam (1), the elastic plate (5) is arranged right above the bottom beam (1), and the mass block (6) is arranged right above the first curved groove (21).
10. An acoustic black hole structure assembly according to any of claims 1 to 9, wherein a plurality of bottom beams (1) are provided and are each coaxially arranged with respect to the y-axis, and each of the bottom beams (1) is integrally formed along the y-axis; each bottom beam (1) is provided with a first structural member (2), a second structural member (3), an elastic member (4), an elastic plate (5), a mass block (6), a first curved groove (21) and a second curved groove (31).
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