CN105719639A - Acoustic material having acoustic focusing function capable of realizing self-repair - Google Patents

Abstract

The invention discloses an acoustic material having an acoustic focusing function capable of realizing self-repair. The acoustic material comprises an Ai wave beam generating device, which is in a left-right symmetric arrangement. The Ai wave beam generating device comprises a plurality of pipeline units, which are arranged linearly in a tightly-attached manner, and each of the pipeline units comprises a plurality of pipelines, which are arranged linearly in a tightly-attached manner, and in addition, the lengths of the pipelines are the same, and the widths of the pipelines of each pipeline unit are the same, and each of the pipelines is filled with zero refractivity materials having different depths. The acoustic material having the acoustic focusing function capable of realizing the self-repair is advantageous in that by using the self-repair characteristic of the Ai wave beams and the constant phase distribution characteristic of the zero refractivity smartly, a pair of Ai wave beams are disposed on the symmetric positions, and therefore the acoustic focusing function capable of realizing self-repair can be realized, and by adopting the characteristic, the sound wave can be transmitted continuously by bypassing a plurality of barriers of the path, and the influence of the barriers on the focusing effect can be reduced greatly.

Description

A kind of acoustical material with the Acoustic focusing realizing self-healing properties

Technical field

The present invention relates to the acoustical material of a kind of Acoustic focusing having and realizing self-healing properties, belong to acoustical material field.

Background technology

Acoustic focusing is with a wide range of applications in Non-Destructive Testing, medical diagnosis and treatment field, and phonon crystal and acoustic metamaterial all can realize Acoustic focusing.But there are some problems in actual applications in the Acoustic focusing that existing method realizes, for instance, in high-strength focusing ultrasonic therapy process, if there is barrier in ultrasonic propagation path, the effect of focusing by severe jamming, can affect the effect for the treatment of.Accordingly, it would be desirable to realize a kind of Acoustic focusing with self-healing properties to solve the problems referred to above.Airy wave beam is the one of non-diffracted beam, has from characteristics such as bending and selfreparings, and its self-healing properties can make sound wave cut-through thing continue to propagate, and this characteristic of Airy wave beam therefore can be utilized to realize the Acoustic focusing with self-healing properties.Zero refraction materials has infinitely-great wavelength and phase velocity and constant PHASE DISTRIBUTION, and the shape leaving the wavefront of zero refraction materials depends on the shape in this material outlet face.Therefore, by designing the shape of a series of pipeline, and fill zero refraction materials of respective depth, to meet the PHASE DISTRIBUTION needed for Airy wave beam, thus obtaining the above-mentioned required Airy wave beam with self-healing properties.

Summary of the invention

Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides the acoustical material of a kind of Acoustic focusing having and realizing self-healing properties, zero refraction materials is utilized to produce Airy wave beam, and bending and the self-healing properties certainly according to Airy wave beam, the Acoustic focusing that there is self-healing properties by using the Airy wave beam produced by zero refraction materials to realize a pair.

Technical scheme: for solving above-mentioned technical problem, a kind of acoustical material with the Acoustic focusing realizing self-healing properties of the present invention, Airy wave beam generator including symmetrical distribution, described Airy wave beam generator includes several piping units being linearly close to arrangement, each piping unit always comprises p the pipeline being linearly close to arrangement, p is positive integer, the length of all pipelines is identical, it is the wave length of sound in the air under certain frequency, the width of p pipeline in each piping unit is identical, the overall width of p pipeline is the Airy wave beam half-wavelength of corresponding position, each pipeline is filled with different depth zero refraction materials, in each pipeline, the degree of depth of material is H, 0≤H≤λ₀, as Ai (10x) >=0, H=(2m+1) λ₀/ 2-10hsin θ；As Ai (10x) < 0, H=n λ₀-10hsin θ, wherein, the length direction along pipeline is y-axis, and zero point is positioned at the symmetrical centre point of acoustical material, and x-axis is the direction of conduit arrangements, λ₀For the wave length of sound in air, m and n is used to control the zero refraction materials degree of depth 0 to λ₀Integer in scope, the h of each pipeline is equal to the horizontal range at its center with y-axis, and θ is used to regulate the bending direction of Airy wave beam, $Ai\left(10x\right)=1/\mathrm{\&pi;}{\&Integral;}_0^{\mathrm{\&infin;}}cos(t^3/3+10xt)dt.$

As preferably, described θ=0.9 °.

In the present invention, Airy wave beam is the one of non-diffracted beam, has the characteristic of selfreparing, and a pair therefore symmetrically placed Airy wave beam also has self-healing properties.Acoustical material in the present invention can produce the Airy wave beam of a pair symmetry, and the Acoustic focusing of its realization has self-repair function in theory.

Beneficial effect: the realization of the present invention has the acoustical material of the Acoustic focusing realizing self-healing properties, make use of the self-healing properties of Airy wave beam and the constant PHASE DISTRIBUTION characteristic of zero refraction materials cleverly, simply placing a pair Airy wave beam in symmetric position achieves the Acoustic focusing with self-healing properties, this characteristic makes sound wave walk around some barriers continuation propagation existed in path in communication process, largely weakens the barrier impact on focusing effect.

Accompanying drawing explanation

Fig. 1 is the Airy function Ai (10x) that chooses in the embodiment change curve with x；

Fig. 2 is for producing the structural representation of the Airy wave beam of Fig. 1 in the present invention；

Fig. 3 is the sound intensity Numerical-Mode graphoid that structure produces as shown in Figure 2；

Fig. 4 is for realizing the lens schematic diagram of Acoustic focusing in the present invention；

Fig. 5 is the sound intensity Numerical-Mode graphoid that lens produce as shown in Figure 4；

Fig. 6 is the sound intensity Numerical-Mode graphoid after adding barrier in structure shown in Fig. 5.

Detailed description of the invention

Embodiment 1

As shown in Figure 4, there is the acoustical material of the Acoustic focusing realizing self-healing properties, Airy wave beam generator including symmetrical distribution, Airy wave beam generator is as shown in Figure 2, described Airy wave beam generator includes several piping units being linearly close to arrangement, each piping unit always comprises p the pipeline being linearly close to arrangement, p is positive integer, the each piping unit of the present embodiment comprises 4 pipelines, the length of all pipelines is identical, being the wave length of sound in the air under certain frequency, the frequency chosen in the present invention is 4500Hz.Fig. 1 is the Airy function Ai (10x) that chooses in the present invention change curve with x, the present invention can also choose other Airy function, this figure shows that the half-wavelength of the Airy wave beam of various location is different, here half-wavelength refers to the distance between two adjacent zero crossings of curve, and the half-wavelength of the width of each piping unit Airy wave beam that is equal on relevant position, therefore the width of each piping unit is also different, the width of four pipelines in each piping unit is identical, the width of pipeline is 1/4th of the Airy wave beam half-wavelength of corresponding position, each pipeline is filled with different depth zero refraction materials, in each pipeline, the degree of depth of material is H,As Ai (10x) >=0, H=(2m+1) λ₀/ 2-10hsin θ；As Ai (10x) < 0, H=n λ₀-10hsin θ, wherein, the length direction along pipeline is y-axis, and zero point is positioned at the symmetrical centre point of acoustical material, and x-axis is the direction of conduit arrangements, λ₀For the wave length of sound in air, m and n is used to control the zero refraction materials degree of depth 0 to λ₀Integer in scope, the h of each pipeline is equal to the horizontal range at its center with y-axis, θ is used to regulate the bending direction of Airy wave beam, choosing in the present invention is 0.9 ° for controlling the angle, θ value in Airy beam-bending direction, actually, within the specific limits θ can any value, by selecting suitable θ value, utilize the material in the present invention to can be implemented in the Acoustic focusing on diverse location.

The half-twist to the right of structure shown in Fig. 2, place on the y axis, region as shown in Fig. 3 white wire frame.Fig. 3 gives sound intensity Numerical-Mode graphoid produced by structure as shown in Figure 2, and numerical simulation medium frequency is 4500Hz, and background medium is air, density p=1.21kg/m³, velocity of sound c=343m/s.This result shows that in the present invention, the structure shown in Fig. 2 is to produce have the Airy wave beam from characteristics such as bendings.

Fig. 4 is the lens schematic diagram for realizing Acoustic focusing of design in the present invention, and these lens are that the structure shown in a pair Fig. 2 is placed on symmetrical position and constitutes.If these lens half-twist to the right place on the y axis, its sound intensity numerical simulation as it is shown in figure 5, in figure white wire frame inner region be the structure shown in Fig. 4.Plane sound wave is incident to lens by left side, it can be seen that acoustic energy is concentrated in the x-axis of distance sound source a distance, has good Acoustic focusing effect.

Additionally, in order to verify whether the Acoustic focusing that the lens in the present invention realize has the characteristic of selfreparing, structure shown in Fig. 5 is placed a circular barrier, in Fig. 6 shown in white circle.The sound intensity distribution that what Fig. 6 provided is when barrier exists, as seen from the figure, after adding barrier, sound wave can continue to propagate by cut-through thing, still has good Acoustic focusing effect.The concordance of Fig. 5 and Fig. 6 result shows that the existence of barrier does not have the effect of severe jamming Acoustic focusing, namely shows that the lens in the present invention can realize the Acoustic focusing with self-healing properties.

The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (2)

1. there is the acoustical material of the Acoustic focusing realizing self-healing properties, it is characterized in that: include the Airy wave beam generator of symmetrical distribution, described Airy wave beam generator includes several piping units being linearly close to arrangement, each piping unit always comprises p the pipeline being linearly close to arrangement, p is positive integer, the length of all pipelines is identical, it is the wave length of sound in the air under certain frequency, the width of p pipeline in each piping unit is identical, the overall width of p pipeline is the Airy wave beam half-wavelength of corresponding position, each pipeline is filled with different depth zero refraction materials, in each pipeline, the degree of depth of material is H, 0≤H≤λ₀, as Ai (10x) >=0, H=(2m+1) λ₀/ 2-10hsin θ；As Ai (10x) < 0, H=n λ₀-10hsin θ, wherein, the length direction along pipeline is y-axis, and zero point is positioned at the symmetrical centre point of acoustical material, and x-axis is the direction of conduit arrangements, λ₀For the wave length of sound in air, m and n is used to control the zero refraction materials degree of depth 0 to λ₀Integer in scope, the h of each pipeline is equal to the horizontal range at its center with y-axis, and θ is used to regulate the bending direction of Airy wave beam, $Ai\left(10x\right)=1/\mathrm{\&pi;}{\&Integral;}_0^{\mathrm{\&infin;}}\cos (t^3/3+10xt)dt.$

2. the acoustical material with the Acoustic focusing realizing self-healing properties according to claim 1, it is characterised in that: described θ=0.9 °.