CN113497994B - Super surface structure and sound wave steering gear with wide band sound wave steering function - Google Patents
Super surface structure and sound wave steering gear with wide band sound wave steering function Download PDFInfo
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- CN113497994B CN113497994B CN202010256612.2A CN202010256612A CN113497994B CN 113497994 B CN113497994 B CN 113497994B CN 202010256612 A CN202010256612 A CN 202010256612A CN 113497994 B CN113497994 B CN 113497994B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
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- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
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Abstract
The invention belongs to the technical field of acoustics, and particularly relates to a super-surface structure with a broadband sound wave steering function, which comprises a side plate, a first vertical plate, a second vertical plate and a third vertical plate, wherein the side plate is respectively vertical to the first vertical plate, the second vertical plate and the third vertical plate, the first vertical plate, the second vertical plate and the third vertical plate are mutually parallel, the side plate, the first vertical plate and the second vertical plate enclose a first cavity structure, the side plate, the second vertical plate and the third vertical plate enclose a second cavity structure, and the inner wall of the second cavity structure is provided with a plurality of super-surface units which are irregular in shape and used for enabling sound waves to deflect. The invention can deflect the incident plane wave in a certain wide frequency range, and the incident plane wave has a specific deflection angle, thereby not only realizing the fluctuation regulation of the sound wave, but also being used for controlling noise. In addition, the invention also provides the acoustic wave diverter.
Description
Technical Field
The invention belongs to the technical field of acoustics, and particularly relates to a super-surface structure with a broadband sound wave steering function and a sound wave steering device.
Background
The acoustic wave metamaterial serving as a sub-wavelength scale acoustic artificial structure can bring many novel physical effects, and has great application prospects in the aspects of noise reduction, shock insulation, sound insulation, stealth, medical ultrasonic imaging, novel acoustic wave device design and the like. Through the ingenious design of the microstructure, the wave performance can be regulated and controlled, and the method has wide application prospects in the fields of aerospace, national defense equipment, buildings and the like.
However, the inventors have found that the existing acoustic wave device: 1) the phase requirement of the broadband cannot be met; 2) broadband sound wave deflection at a specific angle cannot be realized; 3) the specific wave control requirements cannot be met; 4) systematic, efficient, and customized design of super-surface devices is difficult to achieve.
Therefore, a new super-surface structure and a new broadband acoustic wave steering device are needed to solve the above problems.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the super-surface structure with the broadband sound wave steering function is provided, has stable and reliable deflection performance on incident plane waves, and can ensure that the transmitted sound waves can keep a certain deflection angle in a broadband range.
In order to achieve the purpose, the invention adopts the following technical scheme:
a super-surface structure with a broadband sound wave steering function comprises a side plate, a first vertical plate, a second vertical plate and a third vertical plate, wherein the side plate is perpendicular to the first vertical plate, the second vertical plate and the third vertical plate respectively, the first vertical plate, the second vertical plate and the third vertical plate are parallel to each other, the side plate, the first vertical plate and the second vertical plate enclose a first cavity structure, the side plate, the second vertical plate and the third vertical plate enclose a second cavity structure, the inner wall of the second cavity structure is provided with a plurality of super-surface units which are irregular in shape and used for enabling sound waves to deflect, and the plurality of super-surface units are arranged on the side plate.
Further, a first super-surface unit, a second super-surface unit, a third super-surface unit, a fourth super-surface unit, a fifth super-surface unit, a sixth super-surface unit and a seventh super-surface unit are disposed on an inner wall of the second cavity structure, the first super-surface unit, the second super-surface unit and the third super-surface unit are disposed on the second vertical plate, the fourth super-surface unit and the fifth super-surface unit are disposed on the third vertical plate, the sixth super-surface unit and the seventh super-surface unit are disposed between the second vertical plate and the third vertical plate, and the side plate, the second vertical plate, the third vertical plate and the plurality of super-surface units are integrally formed, so that the transmitted sound waves are caused to be directionally deflected.
Further, the volume of the first super-surface unit is A 1 The volume of the second super-surface unit is A 2 The volume of the third super-surface unit is A 3 The volume of the fourth super surface unit is A 4 The volume of the fifth super-surface unit is A 5 The volume of the sixth super-surface unit is A 6 The volume of the seventh super-surface unit is A 7 The volume of the second cavity structure is A 8 Respectively satisfy the relational expressions: a. the 8 /A 1 ＝300；85<A 8 /A 2 <86；154<A 8 /A 3 <155；A 8 /A 4 ＝96；70<A 8 /A 5 <71；184<A 8 /A 6 <185；533<A 8 /A 7 <544, so that the transmitted sound wave generates directional deflection of 15-25 deg.
Further, the super-surface structure further includes a fourth vertical plate parallel to the third vertical plate, the fourth vertical plate is perpendicular to the side plate, the third vertical plate and the fourth vertical plate enclose a third cavity structure, an inner wall of the third cavity structure is provided with an eighth super-surface unit, a ninth super-surface unit, a tenth super-surface unit, an eleventh super-surface unit, a twelfth super-surface unit and a thirteenth super-surface unit, the eighth super-surface unit, the ninth super-surface unit and the tenth super-surface unit are disposed on the third vertical plate, the eleventh super-surface unit and the twelfth super-surface unit are disposed on the fourth vertical plate, and the thirteenth super-surface unit is disposed between the third vertical plate and the fourth vertical plate.
Further, the volume of the eighth super-surface unit is B 1 The volume of the ninth super surface unit is B 2 The volume of the tenth super surface unit is B 3 The volume of the eleven super surface units is B 4 The volume of the twelfth super-surface unit is B 5 The volume of the thirteenth super surface unit is B 6 The volume of the third cavity structure is B 7 Respectively satisfy the relational expressions: b is 7 /B 1 ＝32；B 7 /B 2 ＝1200；B 7 /B 3 ＝192；117<B 7 /B 4 <118；28<B 7 /B 5 <29；B 7 /B 6 ＝1200。
Further, the super-surface structure further includes a fifth vertical plate parallel to the fourth vertical plate, the fifth vertical plate is perpendicular to the side plate, the fourth vertical plate and the fifth vertical plate enclose a fourth cavity structure, an inner wall of the fourth cavity structure is provided with a fourteenth super-surface unit, a fifteenth super-surface unit, a sixteenth super-surface unit, a seventeenth super-surface unit, an eighteenth super-surface unit and a nineteenth super-surface unit, the fourteenth super-surface unit is disposed between the fourth vertical plate and the fifth vertical plate, the fifteenth super-surface unit, the sixteenth super-surface unit and the seventeenth super-surface unit are disposed on the fourth vertical plate, and the eighteenth super-surface unit and the nineteenth super-surface unit are disposed on the fifth vertical plate.
Further, the fourteenth super surface unit has a volume C 1 A volume of the fifteenth super-surface unit is C 2 The volume of the sixteenth super-surface unit is C 3 And the volume of the seventeenth super-surface unit is C 4 And the volume of the eighteenth super-surface unit is C 5 And the volume of the nineteenth super-surface unit is C 6 The volume of the fourth cavity structure is C 7 Respectively satisfy the relational expressions: 82<C 7 /C 1 <83；16<C 7 /C 2 <17；85<C 7 /C 3 <86；C 7 /C 4 ＝192；123<C 7 /C 5 <124；16<C 7 /C 6 <17。
Further, the super-surface structure further includes a sixth vertical plate parallel to the fifth vertical plate, the sixth vertical plate is perpendicular to the side plate, the fifth vertical plate and the sixth vertical plate enclose a fifth cavity structure, a twenty-super-surface unit, a twenty-first super-surface unit and a twenty-second super-surface unit are disposed on an inner wall of the fifth cavity structure, the twentieth super-surface unit is disposed on the fifth vertical plate, the twenty-first super-surface unit and the twenty-twelfth super-surface unit are disposed on the sixth vertical plate, and a volume of the twentieth super-surface unit is D 1 The volume of the twenty-first super-surface unit is D 2 The volume of the second twelve super-surface unit is D 3 The volume of the fifth cavity structure is D 4 Respectively satisfy the relational expressions: 13<D 4 /D 1 <14；12<D 4 /D 2 <13；24<D 4 /D 3 <25。
Further, the super-surface structure further includes a seventh vertical plate parallel to the sixth vertical plate, the seventh vertical plate is perpendicular to the side plate, the sixth vertical plate and the seventh vertical plate enclose a sixth cavity structure, a twenty-third super-surface unit, a twenty-fourth super-surface unit and a twenty-fifth super-surface unit are disposed on an inner wall of the sixth cavity structure, the twenty-thirteenth super-surface unit is disposed on the sixth vertical plate, the twenty-fourteenth super-surface unit and the twenty-fifth super-surface unit are disposed on the seventh vertical plate, and a volume of the twenty-thirteenth super-surface unit is E 1 And the volume of the twenty-four super surface units is E 2 The volume of the twenty-fifth super-surface unit is E 3 The volume of the sixth cavity structure is E 4 Respectively satisfy the relational expressions: 12<E 4 /E 1 <13；7<E 4 /E 2 <8；19<E 4 /E 3 <20。
Furthermore, the lengths of the first vertical plate, the second vertical plate and the third vertical plate are all L, the value range of L is 0.1-0.2 m, the widths of the first vertical plate, the second vertical plate and the third vertical plate are equal, and the width of the first vertical plate, the width of the second vertical plate and the width of the third vertical plate are 0.04-0.05 m.
The second purpose of the invention is: aiming at the defects of the prior art, the acoustic wave steering device comprises the above super-surface structure with the broadband acoustic wave steering function, the relative bandwidth of the acoustic wave steering device is larger than 90%, each structural unit of the acoustic wave steering device comprises a first cavity structure, a second cavity structure, a third cavity structure, a fourth cavity structure, a fifth cavity structure and a sixth cavity structure, the acoustic wave steering device is provided with a plurality of structural units, the plurality of super-surface units in the acoustic wave steering device can be prepared by adopting a photosensitive resin material, and the relation between the acoustic wave deflection angle and the transmission phase gradient is as follows:
wherein λ is t To deflect the wavelength of the acoustic wave, theta t To deflect the angle of deflection, λ, of the sound wave i Is the wavelength of the incident plane wave, θ i Is the angle of incidence of the plane wave,
is the transmission phase gradient.
The invention has the beneficial effects that: the first vertical plate, the second vertical plate and the third vertical plate are parallel to each other, the side plates are perpendicular to the first vertical plate, the second vertical plate and the third vertical plate respectively, the incident propagation of plane waves can be stably and reliably met, the plane waves can horizontally enter, the second cavity structure is provided with a plurality of super-surface units which are irregular in shape and used for deflecting the sound waves, different phases are generated when the incident plane waves pass through the first cavity structure and the second cavity structure respectively, the phases of the incident plane waves are linearly increased along with the serial number of the cavity structures, the transmitted sound waves are enabled to present a certain deflection angle, and the transmitted sound waves are kept stable in a wide frequency range. In addition, the acoustic wave steering device of the present invention has an excellent acoustic wave control function, can realize deflection of a wide-band acoustic wave at a specific angle, can realize linear distribution of a phase difference of the wide-band acoustic wave, and has an important meaning in practical application.
Drawings
FIG. 1 is a schematic plan view of a super-surface structure according to the present invention.
FIG. 2 is a three-dimensional structure diagram of the super-surface structure of the present invention
Fig. 3 is a schematic plan view of a second cavity structure according to the present invention.
Fig. 4 is a schematic plan view of a third cavity structure according to the present invention.
Fig. 5 is a schematic plan view of a fourth cavity structure according to the present invention.
Fig. 6 is a schematic plan view of a fifth cavity structure according to the present invention.
Fig. 7 is a schematic plan view of a sixth cavity structure according to the present invention.
Fig. 8 is a schematic structural view of the acoustic wave diverter of the present invention.
Fig. 9 is a graph showing the test effect of the acoustic wave diverter of the present invention.
Fig. 10 is a graph of deflection angle versus frequency for an acoustic wave diverter of the present invention.
Wherein: 1-side plate; 2-a first vertical plate; 3-a second vertical plate; 4-a third vertical plate; 5-a first cavity structure; 6-a second cavity structure; 7-a fourth vertical plate; 8-a third cavity structure; 9-a fifth vertical plate; 10-a fourth cavity structure; 11-a sixth vertical plate; 12-a fifth cavity structure; 13-a seventh riser; 14-a sixth cavity structure; 101-a first super-surface unit; 102-a second super-surface unit; 103-a third super-surface unit; 104-a fourth super-surface unit; 105-a fifth super-surface unit; 106-a sixth super-surface unit; 107-seventh super-surface unit; 108-an eighth super-surface unit; 109-a ninth super surface unit; 110-a tenth super-surface unit; 111-an eleventh super-surface unit; 112-a twelfth super-surface unit; 113-a thirteenth super-surface unit; 114-a fourteenth super-surface unit; 115-a fifteenth super-surface unit; 116-a sixteenth super-surface unit; 117-a seventeenth super-surface unit; 118-an eighteenth super surface unit; 119-nineteenth super-surface unit; 120-twentieth super surface unit; 121-a twenty-first super-surface unit; 122-a twenty-two super surface unit; 123-a twenty-third super-surface unit; 124-twenty-four super surface units; 125-twenty-fifth super-surface unit.
Detailed Description
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 7, a super-surface structure with broadband sound wave steering function includes a side plate 1, a first vertical plate 2, a second vertical plate 3 and a third vertical plate 4, where the side plate 1 is respectively perpendicular to the first vertical plate 2, the second vertical plate 3 and the third vertical plate 4, the first vertical plate 2, the second vertical plate 3 and the third vertical plate 4 are parallel to each other, the side plate 1, the first vertical plate 2 and the second vertical plate 3 enclose a first cavity structure 5, the side plate 1, the second vertical plate 3 and the third vertical plate 4 enclose a second cavity structure 6, an inner wall of the second cavity structure 6 is provided with a plurality of super-surface units with irregular shapes for deflecting sound waves, an inner wall of the second cavity structure 6 includes a lower surface of the second vertical plate 3, an upper surface of the third vertical plate 4 and a front surface of the side plate 1, the plurality of super-surface units are all disposed on the front surface of the side plate 1, the first vertical plate 2, the second vertical plate 3, the third vertical plate 4 and the third vertical plate 4 are disposed on the front surface of the side plate 4, and the side plate 4 are disposed on the side plate 1, The length L of the third vertical plate 4 is 12cm, the height H between the first vertical plate 2 and the second vertical plate 3 is 4cm, the height between the second vertical plate 3 and the third vertical plate 4 is also 4cm, the widths of the first vertical plate 2, the second vertical plate 3 and the third vertical plate 4 are equal, the widths are 4.1cm, and the second cavity is provided with a second cavityThe volume of the structure 6 was 196.8cm 3 。
The inner wall of the second cavity structure 6 is provided with a first super-surface unit 101, a second super-surface unit 102, a third super-surface unit 103, a fourth super-surface unit 104, a fifth super-surface unit 105, a sixth super-surface unit 106 and a seventh super-surface unit 107, incident plane waves are incident from the left side of first super-surface unit 101, second super-surface unit 102 and third super-surface unit 103 are arranged on second vertical plate 3, fourth super-surface unit 104 and fifth super-surface unit 105 are arranged on third vertical plate 4, sixth super-surface unit 106 and seventh super-surface unit 107 are arranged between second vertical plate 3 and third vertical plate 4, first, second, third, fourth, fifth, sixth and seventh super-surface units 101, 102, 103, 104, 105, 106 and 107 extend horizontally from the front surface of second and third risers 3 and 4 to side plate 1.
The front surface of second vertical plate 3 is flush with the front surface of third vertical plate 4, the front surface of second vertical plate 3 and the front surface of third vertical plate 4 are taken as a first planar rectangular coordinate system, the lowest point (point Q1) at the lower left of the front surface of third vertical plate 4 is taken as the origin of the first planar rectangular coordinate system, the coordinate unit is 0.01cm, the coordinates of each vertex of the front surface of first super surface unit 101 in the first planar rectangular coordinate system are (140, 410), (140, 350), (130, 350), (140, 330), (120, 310), (140, 340), (150, 380), (160, 380) and (160, 410), the area enclosed by the coordinates is 0.16cm 2 (ii) a The coordinates of the vertices of the front surface of the second super-surface unit 102 in the first planar rectangular coordinate system are (460, 410), (460, 310), (500, 320), (510, 340), (520, 400), (530, 400) and (530, 410), respectively, and the area enclosed by the coordinates is 0.56cm 2 (ii) a The coordinates of the vertices of the front surface of the third super-surface unit 103 in the first planar rectangular coordinate system are (680, 410), (680, 340), (690, 330), (720, 330) and (720, 410), respectively, and the coordinates are enclosed by the above coordinatesThe area is 0.31cm 2 (ii) a The coordinates of the vertices of the front surface of the fourth super-surface unit 104 in the first planar rectangular coordinate system are (320, 10), (320, 130), (360, 30), (370, 30) and (370, 10), respectively, and the area enclosed by the coordinates is 0.5cm 2 (ii) a The respective vertices of the front surface of the fifth super-surface unit 105 in the first planar rectangular coordinate system have coordinates (510, 10), (510, 30), (520, 90), (600, 30), (610, 30) and (610, 10), respectively, and the area enclosed by the coordinates is 0.68cm 2 (ii) a The coordinates of the respective vertexes of the front surface of the sixth super-surface unit 106 in the first plane rectangular coordinate system are (780, 70), (780, 90), (790, 140), (780, 160), (820, 120), (810, 120) and (810, 170), respectively, and the area enclosed by the above coordinates is 0.26cm 2 (ii) a The coordinates of the respective vertices of the front surface of the seventh super-surface unit 107 in the first planar rectangular coordinate system are (930, 150), (930, 190), (950, 160), (960, 160), and (960, 150), respectively, and the area enclosed by the above coordinates is 0.09cm 2 (ii) a The area of the blank part of the first plane rectangular coordinate system is 45.44cm 2 。
Preferably, the first super-surface unit 101 has a volume A 1 The volume of the second super-surface unit 102 is A 2 The volume of the third super-surface unit 103 is A 3 The volume of the fourth super-surface unit 104 is A 4 The volume of the fifth super-surface unit 105 is A 5 The volume of the sixth super-surface unit 106 is A 6 The volume of the seventh super-surface unit 107 is A 7 The volume of the second cavity structure 6 is A 8 Respectively satisfy the relational expressions: a. the 8 /A 1 ＝300；85<A 8 /A 2 <86；154<A 8 /A 3 <155；A 8 /A 4 ＝96；70<A 8 /A 5 <71；184<A 8 /A 6 <185；533<A 8 /A 7 <544。
The super-surface structure further includes a fourth vertical plate 7 parallel to the third vertical plate 4, the fourth vertical plate 7 is perpendicular to the side plate 1, the third vertical plate 4 and the fourth vertical plate 7 enclose a third cavity structure 8, an inner wall of the third cavity structure 8 is provided with an eighth super-surface unit 108, a ninth super-surface unit 109, a tenth super-surface unit 110, an eleventh super-surface unit 111, a twelfth super-surface unit 112 and a thirteenth super-surface unit 113, the eighth super-surface unit 108, the ninth super-surface unit 109 and the tenth super-surface unit 110 are arranged on the third vertical plate 4, the eleventh super-surface unit 111 and the twelfth super-surface unit 112 are arranged on the fourth vertical plate 7, the thirteenth super-surface unit 113 is arranged between the third vertical plate 4 and the fourth vertical plate 7, the eighth super-surface unit 108, the ninth super-surface unit 109, the tenth super-surface unit 110, the eleventh super-surface unit 111, the thirteenth super-surface unit 111, Both the twelfth and thirteenth super surface units 112 and 113 horizontally extend from the front surface of the third vertical plate 4 and the front surface of the fourth vertical plate 7 to the side plate 1.
The front surface of third vertical plate 4 is flush with the front surface of fourth vertical plate 7, the front surface of third vertical plate 4 and the front surface of fourth vertical plate 7 are taken as a second planar rectangular coordinate system, the lowest point (point Q2) at the lower left of the front surface of fourth vertical plate 7 is taken as the origin of the second planar rectangular coordinate system, the coordinate unit is 0.01cm, and the coordinates of each vertex of the front surface of eighth super-surface unit 108 in the second planar rectangular coordinate system are (260, 410), (260, 390), (280, 340), (290, 320), (320, 310), (340, 280), (350, 260), (340, 230), (320, 190), (360, 280), (380, 340), (390, 340) (390, 350), (400, 380), (410, 380) and (410 ), the area enclosed by the above coordinates is 1.5cm 2 (ii) a The coordinates of each vertex of the front surface of the ninth super-surface unit 109 in the second planar rectangular coordinate system are (470, 410), (470, 390), (490, 390), and (490, 410), respectively, and the area enclosed by the coordinates is 0.04cm 2 (ii) a The coordinates of the vertices of the front surface of the tenth super surface unit 110 in the second planar rectangular coordinate system are (720, 410), (720, 330), (760, 370), (750, 380), (740, 380), and (740, 410), respectively, and a plane surrounded by the above coordinatesThe product is 0.25cm 2 (ii) a The coordinates of the vertices of the front surface of the eleventh super-surface unit 111 in the second planar rectangular coordinate system are (120, 10), (120), (110, 140), (100, 150), (140, 60), (150, 50), (160, 50) and (160, 10), respectively, and the area enclosed by the coordinates is 0.41cm 2 (ii) a The coordinates of the vertices of the front surface of the twelfth super-surface unit 112 in the second planar rectangular coordinate system are (480, 10), (480, 80), (490, 90), (510, 100), (520, 190), (560, 140), (550, 120), (570, 100), (580, 90), (640, 90), and (640, 10), respectively, and the area enclosed by the above coordinates is 1.7cm 2 (ii) a The coordinates of the respective vertexes of the front surface of the thirteenth super surface unit 113 in the second planar rectangular coordinate system are (900, 290), (900, 310), (920, 310) and (920, 290), respectively, and the area surrounded by the above coordinates is 0.04cm 2 (ii) a The area of the blank part of the second plane rectangular coordinate system is 44.06cm 2 。
Preferably, the eighth super-surface unit 108 has a volume B 1 The ninth super-surface unit 109 has a volume B 2 The volume of the tenth super surface unit 110 is B 3 Eleven super surface units 111 having a volume of B 4 The volume of the twelfth super-surface unit 112 is B 5 The volume of the thirteenth super surface unit 113 is B 6 The volume of the third cavity structure 8 is B 7 Respectively satisfy the relational expressions: b is 7 /B 1 ＝32；B 7 /B 2 ＝1200；B 7 /B 3 ＝192；117<B 7 /B 4 <118；28<B 7 /B 5 <29；B 7 /B 6 ＝1200。
In addition, the super-surface structure further includes a fifth vertical plate 9 parallel to the fourth vertical plate 7, the fifth vertical plate 9 is perpendicular to the side plate 1, the fourth vertical plate 7 and the fifth vertical plate 9 enclose a fourth cavity structure 10, an inner wall of the fourth cavity structure 10 is provided with a fourteenth super-surface unit 114, a fifteenth super-surface unit 115, a sixteenth super-surface unit 116, a seventeenth super-surface unit 117, an eighteenth super-surface unit 118 and a nineteenth super-surface unit 119, the fourteenth super-surface unit 114 is disposed between the fourth vertical plate 7 and the fifth vertical plate 9, the fifteenth super-surface unit 115, the sixteenth super-surface unit 116 and the seventeenth super-surface unit 117 are disposed on the fourth vertical plate 7, the eighteenth super-surface unit 118 and the nineteenth super-surface unit 119 are disposed on the fifth vertical plate 9, the fourteenth super-surface unit 114, the fifteenth super-surface unit 115, the sixteenth super-surface unit 116, the seventeenth super-surface unit 117, Seventeenth, eighteenth and nineteenth super-surface units 117, 118 and 119 extend horizontally from the front surfaces of fourth and fifth risers 7 and 9 to side plate 1.
The front surface of fourth vertical plate 7 and the front surface of fifth vertical plate 9 are flush, the front surface of fourth vertical plate 7 and the front surface of fifth vertical plate 9 are taken as a third rectangular coordinate system, the lowest point (point Q3) at the lower left of the front surface of fifth vertical plate 9 is taken as the origin of the third rectangular coordinate system, the coordinate unit is 0.01cm, the coordinates of each vertex of the front surface of fourteenth super surface unit 114 in the third rectangular coordinate system are (180, 110), (180, 200), (190, 270), (220, 100), (210, 100) and (210, 110), respectively, the area enclosed by the coordinates is 0.58cm 2 (ii) a The coordinates of each vertex of the front surface of the fifteenth super-surface unit 115 in the third planar rectangular coordinate system are (340, 410), (340, 370), (350, 360), (360, 350), (370, 320), (380, 310), (390, 300), (400, 290), (460, 280), (480, 250), (470, 210), (480, 180), (500, 170), (580, 190), (570, 200), (560 ), (560, 210), (530, 220), (520, 260), (540, 340), (550, 390) and (540, 390) and (540, 410), the area enclosed by the above coordinates is 2.98cm 2 (ii) a The coordinates of the respective vertexes of the front surface of the sixteenth super-surface unit 116 in the third planar rectangular coordinate system are (980, 410), (980, 380), (970, 38)0) (970, 370), (960, 290), (1010, 380), (1020, 380) and (1020, 410), the area enclosed by the coordinates being 0.56cm 2 (ii) a The coordinates of the vertices of the front surface of the seventeenth super-surface unit 117 in the third planar rectangular coordinate system are (1170, 410), (1170, 390), (1160, 350), (1170, 340), (1200, 340), and (1200, 410), respectively, and the area enclosed by the above coordinates is 0.25cm 2 (ii) a The coordinates of the vertices of the front surface of the eighteenth super surface unit 118 in the third rectangular planar coordinate system are (320, 10), (320, 50), (330, 90), (360, 60), (370, 40), (380, 40) and (380, 10), respectively, and the area enclosed by the coordinates is 0.39cm 2 (ii) a The coordinates of each vertex of the front surface of the nineteenth super surface unit 119 in the third planar rectangular coordinate system are (660, 10), (660, 40), (670, 50), (680, 60), (710, 90), (720, 170), (710, 200), (700, 250), (680, 270), (720, 230), (740, 170), (750, 150), (760, 140), (770, 130), (810, 140), (820, 130), (830, 120), (870, 110), (880, 110), (880, 80), (890, 70) and (920, 70) and (920, 10), the area enclosed by the above coordinates is 2.9cm 2 (ii) a The area of the blank part of the third rectangular plane coordinate system is 40.34cm 2 。
Preferably, the fourteenth super surface unit 114 has a volume C 1 The fifteenth super-surface unit 115 has a volume C 2 The sixteenth super-surface unit 116 has a volume C 3 The seventeenth super-surface unit 117 has a volume C 4 The volume of the eighteenth super-surface unit 118 is C 5 The nineteenth super-surface unit 119 has a volume C 6 The volume of the fourth cavity structure 10 is C 7 Respectively satisfy the relational expressions: 82<C 7 /C 1 <83；16<C 7 /C 2 <17；85<C 7 /C 3 <86；C 7 /C 4 ＝192；123<C 7 /C 5 <124；16<C 7 /C 6 <17。
Preferably, the super-surface structure further includes a sixth vertical plate 11 parallel to the fifth vertical plate 9, the sixth vertical plate 11 is perpendicular to the side plate 1, the fifth vertical plate 9 and the sixth vertical plate 11 enclose a fifth cavity structure 12, an inner wall of the fifth cavity structure 12 is provided with a twentieth super-surface unit 120, a twenty-first super-surface unit 121 and a twenty-twelfth super-surface unit 122, the twentieth super-surface unit 120 is provided on the fifth vertical plate 9, the twenty-first super-surface unit 121 and the twenty-twelfth super-surface unit 122 are provided on the sixth vertical plate 11, and the volume of the twentieth super-surface unit 120 is D 1 The twenty-first super-surface unit 121 has a volume D 2 The volume of the twenty-two super surface units 122 is D 3 The volume of the fifth cavity structure 12 is D 4 Respectively satisfy the relational expressions: 13<D 4 /D 1 <14；12<D 4 /D 2 <13；24<D 4 /D 3 <25。
Wherein, the twentieth super-surface unit 120, the twenty-first super-surface unit 121 and the twenty-twelfth super-surface unit 122 all extend horizontally from the front surface of the fifth vertical plate 9 and the front surface of the sixth vertical plate 11 to the side plate 1, the front surface of the fifth vertical plate 9 is flush with the front surface of the sixth vertical plate 11, the front surface of the fifth vertical plate 9 and the front surface of the sixth vertical plate 11 are taken as a fourth planar rectangular coordinate system, the lowest point (point Q4) at the lower left of the front surface of the sixth vertical plate 11 is taken as the origin of the fourth planar rectangular coordinate system, the coordinate unit is 0.01cm, and the coordinates of each vertex of the front surface of the twentieth super-surface unit 120 in the fourth planar rectangular coordinate system are (560, 410), (560, 380), (570, 380), (570, 360), (580, 590, 290), (590, 240), (580, 200), (580, 590, 200), (570, 200), (570, 180), (560, 170), (480, 130), (530, 140), (540, 150), (580, 140), (600, 180), (620, 190), (660, 210), (720, 220), (710, 2)20) (710, 270), (720, 310), (730, 340), (750, 350), (740, 400), (750, 400) and (750, 410), the area enclosed by the above coordinates being 3.65cm 2 (ii) a The coordinates of each vertex of the front surface of the twenty-first super surface unit 121 in the fourth planar rectangular coordinate system are (100, 10), (100 ), (110, 120), (120, 130), (140, 150), (200, 140), (210, 130), (270, 140), (280, 160), (300, 170), (310, 180), (330, 190), (340, 200), (350, 210), (370, 240), (380, 250), (410, 260), (420, 290), (460, 230), (390, 230), (370 ), (390, 220), (380, 180), (370, 150), (350, 140), (340, 120), (350, 60), (360, 60) and (360, 10), the area enclosed by the above coordinates is 3.98cm 2 (ii) a The coordinates of each vertex of the front surface of the twelfth hypersurface unit 122 in the fourth plane rectangular coordinate system are (890, 10), (890, 90), (880, 110), (870, 120), (860, 170), (900, 110), (920, 100), (930, 90), (940, 70), (960, 60), (990, 50), (1130, 60), (1140, 70), (1150, 80), (1170, 70), (1200, 70) and (1200, 10), respectively, and the area enclosed by the above coordinates is 1.98cm 2 (ii) a The area of the blank part of the fourth plane rectangular coordinate system is 38.39cm 2 。
Preferably, the super-surface structure further includes a seventh vertical plate 13 parallel to the sixth vertical plate 11, the seventh vertical plate 13 is perpendicular to the side plate 1, the sixth vertical plate 11 and the seventh vertical plate 13 enclose a sixth cavity structure 14, and the inner wall of the sixth cavity structure 14 is provided with a twenty-third super-surface unit 123, a twenty-fourth super-surface unit 124 and a twenty-fifth super-surface unit 124A super surface unit 125, a twenty-third super surface unit 123 is arranged on the sixth vertical plate 11, a twenty-fourth super surface unit 124 and a twenty-fifth super surface unit 125 are arranged on the seventh vertical plate 13, and the volume of the twenty-third super surface unit 123 is E 1 And the volume of the twenty-four super surface unit 124 is E 2 Twenty-fifth super-surface element 125 has a volume E 3 The volume of the sixth cavity structure 14 is E 4 Respectively satisfy the relational expressions: 12<E 4 /E 1 <13；7<E 4 /E 2 <8；19<E 4 /E 3 <20。
Wherein, the thirteenth super surface unit 123, the fourteenth super surface unit 124, and the twenty-fifth super surface unit 125 all extend horizontally from the front surface of the sixth vertical plate 11 and the front surface of the seventh vertical plate 13 to the side plate 1, the front surface of the sixth vertical plate 11 is flush with the front surface of the seventh vertical plate 13, the front surface of the sixth vertical plate 11 and the front surface of the seventh vertical plate 13 are taken as a fifth planar rectangular coordinate system, the lowest point (point Q5) at the lower left of the front surface of the seventh vertical plate 13 is taken as the origin of the fifth planar rectangular coordinate system, the coordinate unit is 0.01cm, and the coordinates of each vertex of the front surface of the thirteenth super surface unit 123 in the fifth planar rectangular coordinate system are (580, 410), (580, 200), (570, 200), (550, 190), (550, 170), (460, 140), (470, 130)', and, (480, 130), (480, 110), (530, 130), (560, 170), (620, 180), (630, 190), (670, 180), (680, 150), (690, 160), (700, 200), (710, 210), (720, 210) and (720, 410), the area enclosed by the above coordinates is 3.78cm 2 (ii) a The coordinates of the vertices of the front surface of the twenty-fourth super surface unit 124 in the fifth planar rectangular coordinate system are (100, 10), (100, 60), (110, 80), (120, 90), (130, 100), (140, 120), (150, 170), (160, 190), (170, 200), (190, 210), (220, 190), (230, 190),(230, 180), (240, 160), (270, 170), (300, 180), (310, 210), (300, 240), (310, 250), (410, 260), (420, 280), (440, 340), (450, 350), (480, 310), (500, 270), (460, 260), (450, 250), (440, 190), (360, 70), (370, 60), (380, 60) and (380, 10), the area enclosed by the coordinates is 6.02cm 2 (ii) a The coordinates of each vertex of the front surface of the twenty-fifth super surface unit 125 in the fifth plane rectangular coordinate system are (880, 10), (880, 70), (870, 170), (940, 140), (930, 120), (940, 90), (990, 70), (1000, 60), (1010, 50), (1150, 70), (1200, 70) and (1200, 10), respectively, and the area enclosed by the above coordinates is 2.51cm 2 (ii) a The area of the blank part of the fifth plane rectangular coordinate system is 35.69cm 2 。
When a plurality of incident plane waves horizontally enter the first cavity structure 5, the second cavity structure 6, the third cavity structure 8, the fourth cavity structure 10, the fifth cavity structure 12 and the sixth cavity structure 14, the phase delay angle of the transmitted sound waves is sequentially increased by 60 degrees, the obtained transmission phase gradient is 25.541rad/m, the theoretical deflection angle of the transmitted sound waves is 20.2 degrees, each cavity structure can meet the deflection of a specific angle of the broadband sound waves from 1600Hz to 4400Hz, and the deflection control of the plane waves with the wavelength length larger than L can be realized.
Example 2
As shown in fig. 8, an acoustic wave diverter comprising the super-surface structure with a broadband acoustic wave diverting function of embodiment 1 has a relative bandwidth of 93.7%.
As shown in FIG. 9, when the frequency of the incident plane wave is 4000Hz, the deflection angle of the sound wave is 20-21 deg.
As shown in FIG. 10, when the frequency range of the incident plane wave is 1600-4400 Hz, the deflection angle of the acoustic wave is 18-22 DEG, which meets the requirement of specific angle deflection of the broadband acoustic wave.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A super-surface structure with broadband acoustic wave steering function, comprising:
a side plate (1), a first vertical plate (2), a second vertical plate (3) and a third vertical plate (4),
the side plate (1) is perpendicular to the first vertical plate (2), the second vertical plate (3) and the third vertical plate (4), and the first vertical plate (2), the second vertical plate (3) and the third vertical plate (4) are parallel to each other;
the side plate (1), the first vertical plate (2) and the second vertical plate (3) enclose a first cavity structure (5);
a second cavity structure (6) is enclosed by the side plate (1), the second vertical plate (3) and the third vertical plate (4), and a plurality of super-surface units which are irregular in shape and used for deflecting sound waves are arranged on the inner wall of the second cavity structure (6);
a first super-surface unit (101), a second super-surface unit (102), a third super-surface unit (103), a fourth super-surface unit (104), a fifth super-surface unit (105), a sixth super-surface unit (106) and a seventh super-surface unit (107) are arranged on the inner wall of the second cavity structure (6);
the first super-surface unit (101), the second super-surface unit (102) and the third super-surface unit (103) are arranged on the second vertical plate (3), the fourth super-surface unit (104) and the fifth super-surface unit (105) are arranged on the third vertical plate (4), and the sixth super-surface unit (106) and the seventh super-surface unit (107) are arranged between the second vertical plate (3) and the third vertical plate (4);
the volume of the first super-surface unit (101) is A 1 The volume of the second super-surface unit (102) is A 2 The volume of the third super surface unit (103) is A 3 The volume of the fourth super-surface unit (104) is A 4 The volume of the fifth super surface unit (105) is A 5 The volume of the sixth super-surface unit (106) is A 6 The volume of the seventh super-surface unit (107) is A 7 The volume of the second cavity structure (6) is A 8 Respectively satisfy the relational expressions: a. the 8 /A 1 =300；85<A 8 /A 2 <86；154<A 8 /A 3 <155；A 8 /A 4 =96；70<A 8 /A 5 <71；184<A 8 /A 6 <185；533<A 8 /A 7 <544。
2. The super-surface structure with broadband acoustic wave steering capability of claim 1, wherein: the super-surface structure further comprises a fourth vertical plate (7) parallel to the third vertical plate (4), the fourth vertical plate (7) is perpendicular to the side plate (1), the third vertical plate (4) and the fourth vertical plate (7) enclose a third cavity structure (8), an eighth super-surface unit (108), a ninth super-surface unit (109), a tenth super-surface unit (110), an eleventh super-surface unit (111), a twelfth super-surface unit (112) and a thirteenth super-surface unit (113) are arranged on the inner wall of the third cavity structure (8), the eighth super-surface unit (108), the ninth super-surface unit (109) and the tenth super-surface unit (110) are arranged on the third vertical plate (4), the eleventh super-surface unit (111) and the twelfth super-surface unit (112) are arranged on the fourth vertical plate (7), the thirteenth super surface unit (113) is disposed between the third vertical plate (4) and the fourth vertical plate (7).
3. The method of claim 2 with broadband acoustic wave steeringSuper surface texture, its characterized in that: the volume of the eighth super-surface unit (108) is B 1 The volume of the ninth super surface unit (109) is B 2 The volume of the tenth super surface unit (110) is B 3 The volume of the eleven super surface units (111) is B 4 The volume of the twelfth super surface unit (112) is B 5 The volume of the thirteenth super surface unit (113) is B 6 The volume of the third cavity structure (8) is B 7 Respectively satisfy the relational expressions: b is 7 /B 1 =32；B 7 /B 2 =1200；B 7 /B 3 =192；117<B 7 /B 4 <118；28<B 7 /B 5 <29；B 7 /B 6 =1200。
4. The super-surface structure with broadband acoustic wave steering capability of claim 2, wherein: the super-surface structure further comprises a fifth vertical plate (9) parallel to the fourth vertical plate (7), the fifth vertical plate (9) is perpendicular to the side plate (1), the fourth vertical plate (7) and the fifth vertical plate (9) enclose a fourth cavity structure (10), a fourteenth super-surface unit (114), a fifteenth super-surface unit (115), a sixteenth super-surface unit (116), a seventeenth super-surface unit (117), an eighteenth super-surface unit (118) and a nineteenth super-surface unit (119) are arranged on the inner wall of the fourth cavity structure (10), the fourteenth super-surface unit (114) is arranged between the fourth vertical plate (7) and the fifth vertical plate (9), the fifteenth super-surface unit (115), the sixteenth super-surface unit (116) and the seventeenth super-surface unit (117) are arranged on the fourth vertical plate (7), the eighteenth super surface unit (118) and the nineteenth super surface unit (119) are disposed on the fifth vertical plate (9).
5. The super-surface structure with broadband acoustic wave steering capability of claim 4, wherein: the volume of the fourteenth super surface unit (114) is C 1 The volume of the fifteenth super-surface unit (115) is C 2 The volume of the sixteenth super-surface unit (116) isC 3 The volume of the seventeenth super-surface unit (117) is C 4 Said eighteenth super-surface unit (118) having a volume C 5 The volume of the nineteenth super-surface unit (119) is C 6 The volume of the fourth cavity structure (10) is C 7 Respectively satisfy the relational expressions: 82<C 7 /C 1 <83；16<C 7 /C 2 <17；85<C 7 /C 3 <86；C 7 /C 4 =192；123<C 7 /C 5 <124；16<C 7 /C 6 <17。
6. The super-surface structure with broadband acoustic wave steering capability of claim 4, wherein: the super-surface structure further comprises a sixth vertical plate (11) parallel to the fifth vertical plate (9), the sixth vertical plate (11) is perpendicular to the side plate (1), the fifth vertical plate (9) and the sixth vertical plate (11) enclose a fifth cavity structure (12), a twentieth super-surface unit (120), a twenty-first super-surface unit (121) and a twenty-twelfth super-surface unit (122) are arranged on the inner wall of the fifth cavity structure (12), the twentieth super-surface unit (120) is arranged on the fifth vertical plate (9), the twenty-first super-surface unit (121) and the twenty-twelfth super-surface unit (122) are arranged on the sixth vertical plate (11), and the volume of the twentieth super-surface unit (120) is D 1 The twenty-first super-surface unit (121) has a volume D 2 The volume of the second twelve super-surface units (122) is D 3 The volume of the fifth cavity structure (12) is D 4 Respectively satisfy the relational expressions: 13<D 4 /D 1 <14；12<D 4 /D 2 <13；24<D 4 /D 3 <25。
7. The super-surface structure with broadband acoustic wave steering capability of claim 6, wherein: the super-surface structure also comprises a seventh vertical plate (13) parallel to the sixth vertical plate (11), the seventh vertical plate (13) is perpendicular to the side plate (1), and the side plate (1), the sixth vertical plate (11) and the seventh vertical plate (13)A sixth cavity structure (14) is formed by enclosing, a thirteenth super surface unit (123), a fourteenth super surface unit (124) and a twenty-fifth super surface unit (125) are arranged on the inner wall of the sixth cavity structure (14), the thirteenth super surface unit (123) is arranged on the sixth vertical plate (11), the fourteenth super surface unit (124) and the twenty-fifth super surface unit (125) are arranged on the seventh vertical plate (13), and the volume of the thirteenth super surface unit (123) is E 1 The volume of the twenty-four super surface units (124) is E 2 A volume of the twenty-fifth super-surface unit (125) is E 3 The volume of the sixth cavity structure (14) is E 4 Respectively satisfy the relational expressions: 12<E 4 /E 1 <13；7<E 4 /E 2 <8；19<E 4 /E 3 <20。
8. An acoustic wave diverter, comprising: the super-surface structure with the broadband acoustic wave steering function of any one of claims 1 to 7.
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| CN107293283A (en) * | 2017-06-15 | 2017-10-24 | 南开大学 | A kind of super surface of acoustics and sound wave focusing arrangement |
| GB201905258D0 (en) * | 2019-04-12 | 2019-05-29 | Univ Of Sussex | acoustic metamaterial systems |
| CN110930974A (en) * | 2019-10-21 | 2020-03-27 | 南京大学 | Acoustic super-surface, coating, housing and movable tool |
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| CN107492370B (en) * | 2017-07-31 | 2020-11-17 | 北京交通大学 | Super surface structure capable of adjusting sound wave focusing |
| CN110683796A (en) * | 2019-11-25 | 2020-01-14 | 惠州市中为柔性光电子智能制造研究院有限公司 | Inhomogeneous metamaterial for converging electromagnetic waves |
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| CN107293283A (en) * | 2017-06-15 | 2017-10-24 | 南开大学 | A kind of super surface of acoustics and sound wave focusing arrangement |
| GB201905258D0 (en) * | 2019-04-12 | 2019-05-29 | Univ Of Sussex | acoustic metamaterial systems |
| CN110930974A (en) * | 2019-10-21 | 2020-03-27 | 南京大学 | Acoustic super-surface, coating, housing and movable tool |
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