CN102568466A - Tunable negative elastic modulus acoustic metamaterial - Google Patents
Tunable negative elastic modulus acoustic metamaterial Download PDFInfo
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- CN102568466A CN102568466A CN2010105906048A CN201010590604A CN102568466A CN 102568466 A CN102568466 A CN 102568466A CN 2010105906048 A CN2010105906048 A CN 2010105906048A CN 201010590604 A CN201010590604 A CN 201010590604A CN 102568466 A CN102568466 A CN 102568466A
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- hollow ball
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Abstract
The invention relates to a negative elastic modulus acoustic metamaterial based on a spilt hollow sphere, in particular to a tunable negative elastic modulus acoustic metamaterial. The structural unit is a spilt hollow sphere (SHS) structure; and through changing the inside component, namely changing the tunable frequency band of an air and water composite medium component, the negative elastic modulus material with tunability is realized. In addition, a research shows that the tunable range of the SHS is widened on the basis that after a steel ball in added into the SHS, the changed volume percentage of water is changed. A tuning method provided by the invention is simple, and can conveniently realize resonance at different frequency bands.
Description
Technical field
The present invention relates to a kind of ultra material of acoustics of negative elastic modulus, the ultra material of particularly a kind of tunable negative elastic modulus acoustics.
Background technology
LHM is meant one type of artificial ature of coal of being arranged in space periodicity by electricity and magnetic resonance unit; Its peculiar fluctuation property is greatly attracting people's research interest especially, like sub-wavelength imaging, negative refraction, dull and stereotyped focusing effect, abnormal Doppler effect, stealthy and perfect lens effect or the like.In the electromagnetics field, with two kinds of textural associations of periodic arrangement split ring resonator (SRRs) and Metallic rod together, can be had the LHM of negative magnetoconductivity and specific inductive capacity simultaneously.Because the similarity of electromagnetic wave and sound wave, from theoretical and experimentally confirm that all the ultra material of acoustics can show negative elastic modulus or negative mass density.The ultra material of acoustics with negative mass density is generally realized through spring oscillator system or film.On the other hand, the ultra material of negative elastic modulus is to be prepared by Helmholtz resonator or open hollow ball.At present, two negative ultra materials of acoustics are to be made up by the structure of bearing elastic modulus and negative mass density that is coupled.Yet a kind of negative structure with single-frequency features of response is difficult to and another kind of negative structure coupling, and therefore, the ultra material of negative acoustics for preparing a kind of Frequency Adjustable becomes the problem of current primary solution.
Recently, our seminar prepares the negative ultra material of elastic modulus acoustics of a kind of two dimension, and it is to be made up of in the sponge substrate open hollow ball (SHS) periodic arrangement.Further confirming now can greatly influence resonant frequency through the physical dimension that changes SHS.The present invention proposes the ultra material of a kind of tunable negative elastic modulus, it is through changing the inner media pack of the SHS easy adjustment resonant frequency of assigning to.
Summary of the invention
The purpose of this invention is to provide a kind of ultra material of tunable negative elastic modulus acoustics based on SHS.Its structural unit is SHS, through changing the internal composition of SHS, promptly changes the complex media component that is made up of water and air, the frequency range of scalable sound wave generation resonance, thus realization has the tunability of negative elastic modulus material.Because tuning methods provided by the present invention is simple, can realize the resonance of different frequency range easily, make that this type of negative elastic modulus more is prone to be coupled with the ultra material of negative mass density, for the two ultra materials of negative acoustics of further preparation provide important reference.
Description of drawings
The structural representation of the ultra material of Fig. 1 acoustics
The interior media synoptic diagram of Fig. 2 SHS
Fig. 3 hatch bore diameter is the transmittance graph of 2.5mm SHS under different composite medium composition
Fig. 4 is equipped with the steel ball of diameter 2mm, and hatch bore diameter is the transmittance graph of 4mm SHS
Fig. 5 is equipped with 1 2mm steel ball, and hatch bore diameter is the transmittance graph of 2.5mm SHS under different composite medium composition
Embodiment
The ultra material of acoustics of the present invention is that the diameter by business level is 10mm; Wall thickness is that polystyrene plastics hollow ball and the cylindrical sponge of 0.5mm formed; Wherein: utilize the machine drilling technology to be respectively the hole of 2.5mm and 4mm, sponge diameter 30mm, thick 25mm at hollow ball one sidetracking diameter.The open hollow ball of preparation is arranged in sponge substrate central authorities, and there are 4 kinds of medium situation respectively in the inside of SHS: 1 has only the medium of air; The complex media of the water of 2 air and interpolation; The steel ball of 3 interpolations and the complex media of air; The steel ball of 4 interpolations and the complex media of water and air.The present invention is the acoustics transmission behavior that realizes SHS through the content that changes water, reaches tuning purpose with this.In addition, after in SHS, adding steel ball, change on the identical basis of the percent by volume of water, can make the tuning range of SHS widen.
Below in conjunction with embodiment and accompanying drawing the present invention is done further explain:
Embodiment one
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 2.5mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; At last: the open hollow ball of preparation is placed on sponge substrate central authorities, has so just made the ultra material of SHS acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (a), and the content of water is 0vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 3.
Embodiment two
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 2.5mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; At last: the open hollow ball of preparation is placed on sponge substrate central authorities, has so just made the ultra material of SHS acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (b), and the content of water is 62.5vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 3.
Embodiment three
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 4mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; At last: the open hollow ball of preparation is placed on sponge substrate central authorities, has so just made the ultra material of SHS acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (a), and the content of water is 0vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 4.
Embodiment four
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 4mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; Then: with diameter is that the steel ball of 2mm adds in the open hollow ball; At last: the SHS of preparation is placed on sponge substrate central authorities, has so just made the ultra material of open hollow ball acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (c), and the content of water is 0vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 4.
Embodiment five
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 2.5mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; Then: with diameter is that the steel ball of 2mm adds in the open hollow ball; At last: the SHS of preparation is placed on sponge substrate central authorities, has so just made the ultra material of open hollow ball acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (c), and the content of water is 0vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 5.
Embodiment six
At first: utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 2.5mm; Secondly: preparation diameter 30mm, the sponge of thick 25mm is as substrate; Then: with diameter is that the steel ball of 2mm adds in the open hollow ball; At last: the SHS of preparation is placed on sponge substrate central authorities, has so just made the ultra material of open hollow ball acoustics, as shown in Figure 1.In addition, the interior media of open hollow ball is seen Fig. 2 (d), and the content of water is 62.5vol%.The acoustic wave transmission curve of this ultra material is as shown in Figure 5.
The above; Be merely the preferred embodiments of the present invention; When not limiting the scope that the present invention implements with this, the simple equivalent of promptly being done according to claim of the present invention and description of the invention content generally changes and modifies, and all should still belong in the scope of patent covering of the present invention.
Claims (6)
1. ultra material of tunable negative elastic modulus acoustics based on the open hollow ball, its structural unit is an acrylic plastering open hollow ball, and substrate is a sponge, and principal character is to realize significantly regulating resonance frequency through changing the open hollow ball with inner media components.
2. according to claim 1 based on the ultra material of negative elastic modulus acoustics of open hollow ball; It is characterized in that only placing 1 diameter in sponge substrate central authorities is 10mm; Wall thickness is the open hollow ball of 0.5mm; Open pore hole dia d=1～2.5mm, and the opening direction of open hollow ball faces the plane of incidence of the ultra material of acoustics.
3. like the said ultra material of tunable negative elastic modulus acoustics of claim 2 based on the open hollow ball; It is characterized in that the scalable resonant frequency range is approximately 3300Hz～4700Hz through the percent by volume 0%～62.5% of water in the open hollow ball that changes hole diameter 2.5mm.
4. like the said ultra material of tunable negative elastic modulus acoustics of claim 2 based on the open hollow ball, it is characterized in that through in the open hollow ball of hole diameter 4mm, adding the steel ball of 2mm, can make resonance frequency from the 5230Hz red shift to 4900Hz.
5. like the said ultra material of tunable negative elastic modulus acoustics of claim 2 based on the open hollow ball; It is characterized in that the scalable resonant frequency range is approximately 3300Hz～5000Hz through changing hole diameter 2.5mm and including the percent by volume 0%～62.5% of water in the open hollow ball of a 2mm steel ball.
6. according to claim 1 based on the ultra material of tunable negative elastic modulus acoustics of open hollow ball, its preparation method may further comprise the steps:
(1) utilize the machine drilling technology to be 10mm at diameter, wall thickness is that the polystyrene plastics hollow ball one sidetracking diameter of 0.5mm is the hole of 2.5～4mm;
(2) be that the steel ball of 2mm adds in the open hollow ball with diameter;
(3) preparation diameter 30mm, the sponge of thick 25mm is as substrate;
(4) be placed on sponge substrate central authorities to the open hollow ball of preparation, fill the water of 0～62.5vol% in the inside of open hollow ball.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347064A (en) * | 2013-07-29 | 2015-02-11 | 波音公司 | Hybrid acoustic barrier and absorber |
| CN105116103A (en) * | 2015-07-16 | 2015-12-02 | 北京理工大学 | Metamaterial having characteristics of pentamode material, and determination method thereof |
| CN105840710A (en) * | 2016-05-27 | 2016-08-10 | 西南交通大学 | Acoustic metamaterial suspension vibration isolation structure |
| CN106765678A (en) * | 2017-01-09 | 2017-05-31 | 美的集团股份有限公司 | Silencer and air-conditioning system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347064A (en) * | 2013-07-29 | 2015-02-11 | 波音公司 | Hybrid acoustic barrier and absorber |
| CN104347064B (en) * | 2013-07-29 | 2021-02-09 | 波音公司 | Hybrid resonator and array of hybrid resonators |
| CN105116103A (en) * | 2015-07-16 | 2015-12-02 | 北京理工大学 | Metamaterial having characteristics of pentamode material, and determination method thereof |
| CN105840710A (en) * | 2016-05-27 | 2016-08-10 | 西南交通大学 | Acoustic metamaterial suspension vibration isolation structure |
| CN105840710B (en) * | 2016-05-27 | 2018-11-20 | 西南交通大学 | A kind of acoustic metamaterial suspension vibration insulation structure |
| CN106765678A (en) * | 2017-01-09 | 2017-05-31 | 美的集团股份有限公司 | Silencer and air-conditioning system |
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