CN109741729B - Tunable water-air interface sound wave communication structure - Google Patents
Tunable water-air interface sound wave communication structure Download PDFInfo
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- CN109741729B CN109741729B CN201811515617.1A CN201811515617A CN109741729B CN 109741729 B CN109741729 B CN 109741729B CN 201811515617 A CN201811515617 A CN 201811515617A CN 109741729 B CN109741729 B CN 109741729B
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Abstract
The invention relates to a tunable water-air interface acoustic wave communication structure, which comprises at least one structural unit, wherein the structural unit comprises an acoustic main waveguide and a coupling side branch pipe which are arranged in a base material; the two spring sliding blocks are oppositely arranged between the main acoustic waveguide and the coupling side branch pipe along the radial direction of the cross section of the coupling side branch, and a connecting throat pipe for communicating the main acoustic waveguide and the coupling side branch pipe is formed in a gap between the two oppositely arranged spring sliding blocks; the invention realizes the width adjustment of the connecting throat pipe by adjusting the distance between the two spring sliders, and the connecting throat pipe divides the coupling side branch pipe into two symmetrical parts along the radial direction of the section of the coupling side branch pipe; the resonance state of the coupling waveguide is adjusted by changing the structure of the coupling waveguide, so that the transmission of sound waves of multiple frequency points between water and air is realized, and the aim of sound information transmission between sea and air is fulfilled.
Description
Technical Field
The invention relates to a tunable water-air interface sound wave communication structure, and belongs to the field of water acoustics and audio acoustics.
Background
For the water-air interface with unmatched acoustic impedance, the traditional impedance matching method can be used for impedance matching, but in many practical applications, finding a proper matching layer material is very difficult; on the other hand, conventional acoustic impedance matching acoustic transmission is effective at a certain fixed frequency, which is difficult to use in water-air acoustic information transmission requiring multi-frequency point acoustic transmission.
The main problems are that: in order to reduce the energy attenuation of the sound wave in the transmission process and ensure that the sound wave has certain energy, the transmitted sound wave is required to have smaller frequency. Therefore, to realize tunable acoustic transmission in low frequency band, it is necessary to study how to reduce the size of the acoustic structure and how to adjust the resonance state of the structure to satisfy the transmission of acoustic waves with different frequencies, so as to better implement practical application.
Disclosure of Invention
The invention provides a tunable water-air interface sound wave communication structure, which realizes the transmission of sound waves of multiple frequency points between water and air by changing the structure of a coupling waveguide to adjust the resonance state of the coupling waveguide, thereby achieving the aim of sound information transmission between sea and air.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a tunable water-air interface acoustic wave communication structure comprises at least one structural unit,
the structural unit comprises an acoustic main waveguide and a coupling side branch pipe which are arranged in a base material;
the two spring sliding blocks are oppositely arranged between the main acoustic waveguide and the coupling side branch pipe along the radial direction of the cross section of the coupling side branch, and a connecting throat pipe for communicating the main acoustic waveguide and the coupling side branch pipe is formed in a gap between the two oppositely arranged spring sliding blocks;
the width of the connecting throat is adjusted by adjusting the distance between the two spring sliders, and the connecting throat divides the coupling side branch into two symmetrical parts along the radial direction of the section of the coupling side branch;
as a further preferred aspect of the present invention, the spring slider includes a spring and a mass block, the spring is fixed on the mass block, and a hole-shaped structure formed by a gap between the mass blocks arranged oppositely is a connecting throat;
as a further preferred aspect of the present invention, the aforementioned structural units are arranged in a periodic array form or in a non-periodic array form;
as a further preferred aspect of the present invention, the acoustic main waveguide is a linear type or a curved type;
as a further preferred aspect of the present invention, the section of the acoustic main waveguide is circular, square, rectangular, or triangular;
as a further preferred aspect of the present invention, the cross section of the mass block is circular, square, rectangular or triangular;
as a further preferable aspect of the present invention, the connecting throat is a hole-shaped structure opened on a side wall of the acoustic main waveguide, and the cross section of the connecting throat is circular, square, rectangular or triangular;
as a further preferable mode of the present invention, the coupling bypass branch pipe is linear or curved;
as a further preferred aspect of the present invention, the cross section of the coupling side branch pipe is circular, square, rectangular or triangular;
as a further preferred aspect of the present invention, the aforementioned structural units are arranged in a periodic array or in a non-periodic array, and the periodic or non-periodic array is linear or curved.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
periodic coupling waveguides are designed, and a structural unit of each period is a composite waveguide; the resonance state of the structure is adjusted by changing the structural size of the coupling waveguide, and the multi-frequency point acoustic information transmission between the impedance mismatched water-air interfaces is facilitated.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the structural elements of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure units of the preferred embodiment of the present invention after being arranged periodically;
FIG. 3 is a theoretical analysis diagram of a preferred embodiment of the present invention;
FIG. 4 is a graph of acoustic transmission at different incident angles for a preferred embodiment of the present invention, where 4a is the acoustic transmission coefficient T E4b is the sound transmission coefficient T at different incident angles according to the change of frequencyEA change in (c).
Wherein, 1 is a main acoustic waveguide, 2 is a connecting throat, 3 is a coupling side branch pipe, and 4 is a spring slider.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, the present invention includes the following features: 1 is a sound main waveguide, 2 is a connecting throat, 3 is a coupling side branch pipe, and 4 is a spring slide block.
The invention relates to a tunable water-air interface acoustic wave communication structure, which comprises at least one structural unit,
the structural unit comprises an acoustic main waveguide and a coupling side branch pipe which are arranged in a base material;
the two spring sliding blocks are oppositely arranged between the main acoustic waveguide and the coupling side branch pipe along the radial direction of the cross section of the coupling side branch, and a connecting throat pipe for communicating the main acoustic waveguide and the coupling side branch pipe is formed in a gap between the two oppositely arranged spring sliding blocks;
the width of the connecting throat is adjusted by adjusting the distance between the two spring sliders, and the connecting throat divides the coupling side branch into two symmetrical parts along the radial direction of the section of the coupling side branch;
as a further preferred aspect of the present invention, the spring slider includes a spring and a mass block, the spring is fixed on the mass block, and a hole-shaped structure formed by a gap between the mass blocks arranged oppositely is a connecting throat;
as a further preferred aspect of the present invention, the aforementioned structural units are arranged in a periodic array form or in a non-periodic array form;
as a further preferred aspect of the present invention, the acoustic main waveguide is a linear type or a curved type;
as a further preferred aspect of the present invention, the section of the acoustic main waveguide is circular, square, rectangular, or triangular;
as a further preferred aspect of the present invention, the cross section of the mass block is circular, square, rectangular or triangular;
as a further preferred aspect of the present invention, the connecting throat is a hole-shaped structure opened on the side wall of the sound main waveguide, and the cross section of the connecting throat is circular, square, rectangular or triangular;
as a further preferable mode of the present invention, the coupling bypass pipe is linear or curved;
as a further preferred aspect of the present invention, the cross section of the coupling side branch pipe is circular, square, rectangular or triangular;
as a further preferred aspect of the present invention, the aforementioned structural units are arranged in a periodic array or in a non-periodic array, and the periodic or non-periodic array is linear or curved;
in a further preferred embodiment of the present invention, the material of the base material and the cell structure may be a metal, a non-metal material, or any other solid material.
FIG. 1 shows one of the structural units arranged in a periodic array or in a non-periodic array in the whole communication structure, which includes a main acoustic waveguide and a coupling side branch pipe opened in a base material; the two spring sliding blocks are oppositely arranged between the main acoustic waveguide and the coupling side branch pipe along the radial direction of the cross section of the coupling side branch, and a connecting throat pipe for communicating the main acoustic waveguide and the coupling side branch pipe is formed in a gap between the two oppositely arranged spring sliding blocks; the width of the connecting throat is adjusted by adjusting the distance between the two spring sliders, and the connecting throat divides the coupling side branch into two symmetrical parts along the radial direction of the section of the coupling side branch; the material selected for the structure is aluminum, which can be regarded as a hard boundary, and the sound wave of 100-2000HZ is discussed in a centralized way; wherein:
the sound main wave guide is used for connecting the incident and emergent edges and conducting sound waves, and the medium is water or air;
the connecting throat is used for connecting the main waveguide and the coupling side branch pipe;
the resonance state of the coupling structure is changed by adjusting the distance between the two spring sliders, namely the opening size or the position of the connecting throat relative to the main acoustic waveguide and the coupling side branch pipe;
the section of the acoustic main waveguide is circular, square, rectangular or triangular, and the structure of the cross section can be regular or irregular;
the cross section of the mass block is circular, square, rectangular or triangular, and the structure of the cross section can be regular or irregular;
the connecting throat pipe is of a hole-shaped structure arranged on the side wall of the sound main waveguide, the section of the connecting throat pipe is circular, square, rectangular or triangular, and the structure of the cross section can be regular or irregular;
the cross section of the coupling side branch pipe is circular, square, rectangular or triangular, and the structure of the cross section can be regular or irregular;
FIG. 2 is a schematic diagram of a plate-like structure with structural units arranged periodically to improve applicability, wherein sound waves are incident from one end of a water-air interface and received at the other end of the interface;
as shown in fig. 3, according to the local description analysis method, the continuity condition and the acoustic impedance propagation equation, the acoustic properties including the sound pressure, the sound velocity and the acoustic impedance in the structural unit can be described, and since the length of the coupling waveguide is similar to the wavelength, the following equation can be used to describe the acoustic properties:
We can obtain the acoustic impedance of the coupling hole by calculation:
wherein d is1,d2Respectively representing the lengths of the coupling side branch pipes divided by the connecting throat pipe;
the acoustic impedance at the junction of the throat and the waveguide can be obtained according to an acoustic impedance transfer formula:
Fig. 4 is an acoustic transmission spectrum of the coupling structure at different incident angles, and experiments are performed at 0 degrees, 30 degrees and 60 degrees by changing the incident angle, and it can be known from the graph that the acoustic wave has higher transmittance in a large incident angle range, which indicates that the acoustic energy transmission amount is large and the incident angle range of the acoustic wave is wide.
The multi-frequency point transmission peak in the figure IV is generated by resonance between the waveguide tube and the coupling hole, and the resonance states of the main acoustic waveguide and the side coupling branch tube are changed by changing the geometric parameters of the structure, so that the position of the transmission peak is changed, and the information transmission of the acoustic wave under different frequencies can be adjusted;
it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A tunable water-air interface acoustic wave communication structure is characterized in that: comprises at least one structural unit, wherein the structural unit is composed of a plurality of structural units,
the structural unit comprises an acoustic main waveguide and a coupling side branch pipe which are arranged in a base material;
the two spring sliding blocks are oppositely arranged between the main acoustic waveguide and the coupling side branch pipe along the radial direction of the cross section of the coupling side branch, and a connecting throat pipe for communicating the main acoustic waveguide and the coupling side branch pipe is formed in a gap between the two oppositely arranged spring sliding blocks;
the width of the connecting throat pipe is adjusted by adjusting the distance between the two spring sliders, and the connecting throat pipe divides the coupling side branch pipe into two symmetrical parts along the radial direction of the cross section of the coupling side branch pipe.
2. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the spring sliding block comprises a spring and a mass block, the spring is fixed on the mass block, and a hole-shaped structure formed by a gap between the mass blocks which are arranged oppositely is a connecting throat.
3. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the aforementioned structural units are arranged in a periodic array or in a non-periodic array.
4. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the acoustic main waveguide is linear or curved.
5. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the section of the acoustic main waveguide is circular or square or rectangular or triangular.
6. The tunable water-air interface acoustic wave communication structure of claim 2, wherein: the cross section of the mass block is round or square or rectangular or triangular.
7. The tunable water-air interface acoustic wave communication structure of claim 2, wherein: the connecting throat is a hole-shaped structure formed on the side wall of the sound main waveguide, and the cross section of the connecting throat is circular or square or rectangular or triangular.
8. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the coupling side branch pipe is in a linear type or a bending type.
9. The tunable water-air interface acoustic wave communication structure of claim 1, wherein: the cross section of the coupling side branch pipe is circular or square or rectangular or triangular.
10. The tunable water-air interface acoustic wave communication structure of claim 3, wherein: the structural units are arranged in a periodic array or a non-periodic array, and the periodic or non-periodic array is linear or curved.
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| CN201811515617.1A CN109741729B (en) | 2018-12-12 | 2018-12-12 | Tunable water-air interface sound wave communication structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002095100A (en) * | 2000-09-19 | 2002-03-29 | Victor Co Of Japan Ltd | Control data rewrite/add device, method, transmission method use therefor, and recording medium |
| KR101422113B1 (en) * | 2013-04-26 | 2014-07-22 | 목포해양대학교 산학협력단 | Soundproof wall which has overlapped resonant chambers around air or water passage that makes air or water pass freely |
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| CN106205584A (en) * | 2016-07-06 | 2016-12-07 | 南京大学 | A kind of broadband noise elimination pipeline of Helmholtz resonator based on adjustable resonant frequency |
| CN108133700A (en) * | 2017-12-20 | 2018-06-08 | 南京航空航天大学 | A kind of acoustics black hole vibration and noise reducing device |
| CN108182935A (en) * | 2018-02-06 | 2018-06-19 | 张子良 | The intensifier and method of sound wave, the detection of electromagnetic wave device or communication capacity |
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| Title |
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| Generation of acoustic-gravity waves by a submerged monopole source located near the water-air interface;Iosif Fuks et al.;《OCEANS"11 MTS/IEEE KONA》;20111219;第1-10页 * |
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