CN108281131B - Full-space active noise suppression device and preparation method thereof - Google Patents

Full-space active noise suppression device and preparation method thereof Download PDF

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Publication number
CN108281131B
CN108281131B CN201810021472.3A CN201810021472A CN108281131B CN 108281131 B CN108281131 B CN 108281131B CN 201810021472 A CN201810021472 A CN 201810021472A CN 108281131 B CN108281131 B CN 108281131B
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noise
noise suppression
full
active noise
mass density
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CN108281131A (en
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孙非
何赛灵
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Changshu Zheda Zijin Optoelectronic Technology Research Center
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Changshu Zheda Zijin Optoelectronic Technology Research Center
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a full-space active noise suppression device and a preparation method thereof. The device is a rectangular anisotropic acoustic structure, the noise source and the anti-noise source are positioned in the structure, and the noise generated by the whole device to the whole external space region can be effectively inhibited. Compared with the traditional active noise suppression technology, the active noise suppression device in the whole space can realize effective noise suppression for all space regions except the device by only one anti-noise source, and not for limited closed regions.

Description

Full-space active noise suppression device and preparation method thereof
Technical Field
The invention belongs to a novel acoustic wave device, and relates to a full-space active noise suppression device and a preparation method thereof.
Background
The control of noise is of great significance to human production and life: the machining precision of the high-precision machining equipment can be influenced by noise in the surrounding environment; noise pollution harms human health and even causes various diseases; the method has important application value in anti-reconnaissance in the field of national defense military, in particular to noise suppression technology in anti-reconnaissance technologies such as underwater submarines and the like. Conventional noise suppression techniques can be largely classified into passive noise suppression techniques and active noise suppression techniques. For passive noise suppression techniques, noise suppression is achieved mainly by placing sound absorbing material around the source of the noise or the area where noise reduction is required [ 1 ]. The passive noise reduction technology can not only obtain effective noise reduction effect on a determined noise source, but also can realize effective noise reduction on random noise in the environment (for example, noise reduction in areas outside places such as KTV and gymnasiums). However, the passive noise reduction technology is not very good for low-frequency noise effect, and in order to achieve a very good noise reduction degree, a very thick wave-absorbing material (such as a keel, a porous structure, etc.) needs to be placed around the environment.
Active noise reduction techniques are more specific to certain noise sources (e.g. automobile engines, motors, cooling towers, etc.), and use the interference principle of sound waves: the specified space generates the anti-noise with the same amplitude and opposite phase with the noise source at the position in real time, so that the anti-noise is superposed with the main noise, and finally the purpose of reducing the noise is achieved [ 2,3 ]. With the development of signal processing technology and electronic circuit technology, active noise reduction technology has been well developed in recent years. Compared with a passive noise reduction technology, the active noise reduction technology can obtain a good noise reduction effect in a certain space region through a small anti-noise source or an array consisting of a plurality of anti-noise sources (a large amount of sound absorption materials do not need to be covered at the boundary of the region). The noise in the environment is irregularly changed along with time (frequency, amplitude, phase and spatial position), so that the active noise control must adapt to the change to generate corresponding anti-noise, and the active noise reduction research is mainly focused on the research of an adaptive algorithm. The noise reduction earphone (ear muff) can realize the noise reduction effect only by one secondary anti-noise source, but the noise reduction area is very small. To achieve effective noise reduction over larger areas (e.g. car interiors, aircraft cabins), more secondary sources of anti-noise are required, and the design algorithms will be more complex (relative to the volume, spatial distribution shape, etc. of a particular enclosed area). Aiming at the problem that the existing active noise reduction technology is difficult to obtain effective noise reduction in a super-large space by means of a single anti-noise source, the invention designs a novel structure which can realize effective noise reduction in all spaces except a given space region.
【1】Yang,J.,Lee,J.S.,&Kim,Y.Y.Multiple slow waves in metaporous layers for broadband sound absorption.Journal of Physics D:Applied Physics,50(1),015301(2016)。
【2】Paul,L.U.S.Patent No.2,043,416.Washington,DC:U.S.Patent and Trademark Office(1936)。
【3】 Active noise control, Chenkean, national defense industry Press.
Disclosure of Invention
1. The object of the invention is to provide a method for producing a high-quality glass.
The invention provides a full-space active noise suppression device and a preparation method thereof, aiming at solving the problem that the existing active noise reduction technology can only obtain good noise reduction effect for a limited space area.
2. The technical scheme adopted by the invention is disclosed.
The invention discloses an active noise suppression device, which consists of a rectangular acoustic anisotropic medium, wherein a noise source and an anti-noise source are positioned on the horizontal middle line of the whole device; the mass density of the whole device is distributed as follows:
the mass density is anisotropic: component ρ of mass density along the horizontal directionx→0。
In still further embodiments, the device has a mass density along a vertical component ρy→ infinity; young's modulus being isotropic material kappax＝κy→∞。
In still further embodiments, the other regions than the device are all air.
The invention discloses a preparation method of an active noise suppression device, which comprises the following steps: constructing a rectangular acoustic anisotropic medium, wherein a noise source and an anti-noise source are positioned on a horizontal center line of the whole device;
component p of the mass density of the entire device along the horizontal directionx→ 0 step.
In still further embodiments, the method further comprises constructing the device with a component ρ along the vertical direction of the mass densityy→ infinity; young's modulus being isotropic material kappax＝κyAnd → infinity step.
In a further embodiment, the other regions than the device are all air.
The invention discloses a preparation method of an anisotropic medium of an active noise suppression device, wherein the anisotropic medium adopts a plurality of isotropic materials which are staggered along the horizontal direction.
In a further embodiment, two isotropic materials are used, staggered along the horizontal direction.
3. The invention has the beneficial effects.
(1) The invention can realize effective noise reduction of all spatial regions except devices, and is not directed to a certain limited closed region.
(2) The invention can be realized by only one anti-noise secondary source; different from the traditional active noise reduction technology, the number of required anti-noise sources is increased correspondingly with the increase of the effective noise reduction interval.
Drawings
Fig. 1 is a two-dimensional cross-sectional view of a device.
Fig. 2 is a sound field amplitude distribution diagram on a sectional line of 0.15m of the region x outside the device.
Fig. 3 is a detailed structural view of the device.
Detailed Description
In order to make the technical spirit and advantages of the present invention more clearly understandable to examiners of the patent office and particularly to the public, the applicant shall describe in detail below by way of examples, but the description of the examples is not a limitation of the present invention, and any equivalent changes made according to the present inventive concept, which are merely formal and insubstantial, shall be considered to be within the scope of the present invention.
Example 1
As shown in fig. 1 (two-dimensional cross-sectional view), the entire device is composed of a rectangular anisotropic material (black rectangle in fig. 1). The mass density of the rectangular medium is anisotropic: the component of the mass density in the horizontal direction tends to 0(ρ)x→ 0), the mass density component along the vertical direction is very large. Young's modulus is an isotropic material with a very large value (κ)x＝κy→ ∞). The noise source (black circle) and the anti-noise source (black five stars) are each on the horizontal centerline of the rectangular anisotropic medium described above. The whole structure can realize effective noise reduction of other external whole regions. Note that the dimensions of the device can be adjusted according to the actual sound source conditions, and the key to achieving the effect is the anisotropic material.
We give a specific example below: the acoustic frequency in the simulation was chosen to be 10kHz, the anisotropic rectangular material was chosen to be 0.04m in height and 0.1m in width. The component of the mass density in the horizontal direction was 0.001kg/m3Component in the vertical direction of 1000kg/m3. The Young's modulus of the rectangular material was 1000 Pa. The noise source is a singleThe position of the point source is radiation power (-0.03m, 0). The anti-noise source is also a point source of unit radiation power (180 degrees out of phase with the noise source), and is located at (0.03m, 0). Fig. 2 is a diagram showing the sound field amplitude distribution on a sectional line of 0.15m in the region x outside the device, and shows the case where an anti-noise source and an anisotropic medium are added, an anti-noise source alone is not added, and an anisotropic medium alone is added, respectively. It can be seen that there is a good noise suppression effect for any location after the addition of the anti-noise source and the anisotropic medium. The noise suppression effect after the addition of the anisotropic medium is much better than that of the addition of only an anti-noise source (without the addition of the anisotropic medium).
Example 2
A device implementation method is given below, which can be achieved by means of two isotropic materials with mass densities and Young's moduli respectively of rho according to the theory of acoustically effective media1＝0.01kg/m3,κ1＝1000Pa；ρ2＝1000kg/m3,κ 21000 Pa; the materials are staggered along the horizontal direction (the interface of the materials is parallel to the x-axis). The desired anisotropic media can be achieved by means of such a staggered arrangement of the two isotropic materials.
As shown in FIG. 3, in actual use, the area of the anisotropic medium (3-3, shown) surrounding the noise source (3-1) and the anti-noise source (3-2) may be hollowed out, and the hollowed-out area filled with air (3-4 and 3-5). The dimensions and parameters of the rectangular device are the same as the specific example given in fig. 1 above, except that two air circular holes (of size 0.005m) of the same radius are dug in the noise point source (at (-0.03m, 0)) and the anti-noise point source (at (0.03m, 0)), respectively. Thus, the noise source can be in real air environment, and the device can still effectively reduce noise.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Claims (6)

1. A full-space active noise suppression device, characterized by: the device is composed of a rectangular acoustic anisotropic medium, and a noise source and an anti-noise source are positioned on the horizontal middle line of the whole device; the mass density of the whole device is distributed as follows:
the mass density is anisotropic: component ρ of mass density along the horizontal directionx→0；
The mass density of the device is along the vertical component py→ infinity; young's modulus being isotropic material kappax=κy→∞。
2. The full-space active noise suppression device according to claim 1, wherein: the other regions outside the device are all air.
3. A method for preparing a full-space active noise suppression device is characterized by comprising the following steps: constructing a rectangular acoustic anisotropic medium, wherein a noise source and an anti-noise source are positioned on a horizontal center line of the whole device;
component p of the mass density of the entire device along the horizontal directionx→ 0 step;
further comprising constructing a component ρ of the mass density of the device along the vertical directiony→ infinity; young's modulus being isotropic material kappax=κyAnd → infinity step.
4. The method of manufacturing a full-space active noise suppression device according to claim 3, wherein: the other regions outside the device are all air.
5. The method of manufacturing a full-space active noise suppression device according to claim 3, wherein: the anisotropic medium adopts a plurality of isotropic materials which are staggered along the horizontal direction.
6. The method of fabricating a full-space active noise suppression device according to claim 5, wherein: the anisotropic medium adopts two isotropic materials which are staggered along the horizontal direction.
CN201810021472.3A 2018-01-10 2018-01-10 Full-space active noise suppression device and preparation method thereof Active CN108281131B (en)

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