CN112037750A - Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate - Google Patents
Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate Download PDFInfo
- Publication number
- CN112037750A CN112037750A CN202010889489.8A CN202010889489A CN112037750A CN 112037750 A CN112037750 A CN 112037750A CN 202010889489 A CN202010889489 A CN 202010889489A CN 112037750 A CN112037750 A CN 112037750A
- Authority
- CN
- China
- Prior art keywords
- acoustic metamaterial
- folding
- movable pull
- pull rod
- active acoustic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011133 lead Substances 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 25
- 230000009467 reduction Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910001095 light aluminium alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Building Environments (AREA)
Abstract
The invention relates to an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate, the active acoustic metamaterial structure unit comprises a rigid frame and a resonance unit, the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and mass blocks, the fixed support, the fixed hinged support and the first telescopic rod are all a plurality of same in number, one side of the first movable pull rod is connected with the first telescopic rod, the other side of the first movable pull rod is connected with one end of the folding elastic thin plate, the first telescopic rod is fixed in the rigid frame through the fixed support and the fixed hinged support, the mass blocks are bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic thin plate is stretched or extruded, so that the whole folding distance of the folding elastic thin plate is changed. The unit widens the sound insulation frequency band of the acoustic metamaterial.
Description
Technical Field
The invention relates to the technical field of sound insulation and noise reduction, in particular to an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate.
Background
The problems of vibration and noise are widely existed in the fields of daily life, transportation, building production, national defense equipment and the like, low-frequency noise has the characteristics of longer wavelength, strong diffraction capability and difficult energy attenuation, the control on the low-frequency noise is difficult in sound insulation and noise reduction technology, and strong noise, particularly the low-frequency noise, harms the health of human body, causes fatigue failure of mechanical structure, causes the failure of precise instruments and equipment, reduces the fighting performance and stealth capability of weapons and the like; with the rapid development of modern scientific technology and industrial technology, the demand for noise control is increasing, and how to effectively realize low-frequency sound insulation and noise reduction becomes a key technical problem to be solved urgently in life and engineering.
Traditional sound insulation and absorption materials and structures such as rubber-plastic plates, foam plates, fiber materials and the like are restricted by the mass law, and the control of low-frequency noise is mainly realized in a mode of increasing the thickness of the structure. Through the surface density of the structure, the inertia resistance is increased, so that the structure is not easy to vibrate, and the sound insulation effect is improved. However, the mass per unit area is doubled, the sound insulation amount is increased by only 6dB, and the sound insulation effect is not ideal. With the stricter requirements of various instruments and equipment on the quality and thickness of the noise reduction material, the limitations of the traditional noise reduction material are increasingly prominent; the acoustic metamaterial is a periodic structure which is manufactured artificially and has structural size units far smaller than the wavelength of sound waves, comprises local resonance units or other characteristic units, has special properties such as negative refraction, negative mass density and the like which are not possessed by conventional materials in many natural fields, provides possibility for realizing low-frequency sound insulation, and has wide application prospects in life and engineering.
Although the acoustic metamaterial provided in the prior art has excellent low-frequency sound insulation characteristics and still has defects in the face of complex acoustic environments, generally, the acoustic metamaterial controls low-frequency noise of a certain frequency band in a passive mode, once the structural parameters of the metamaterial are determined, the high transmission loss frequency band position of the structure cannot be adjusted, the sound insulation band gap of the structure is narrow, and further improvement of the sound insulation characteristics of the structure is affected. In addition, for the film type acoustic metamaterial, due to aging effect and temperature change, the initial designed prestress of the film is changed, so that the position of a high transmission loss frequency band is changed, and the sound insulation and noise reduction capability of the film type acoustic metamaterial is influenced.
Disclosure of Invention
In view of the above, it is desirable to provide an active acoustic metamaterial unit, a control system and an acoustic metamaterial plate, so as to solve the problem of narrow acoustic frequency band in the prior art.
The invention provides an active acoustic metamaterial structure unit, which comprises a rigid frame and a resonance unit, the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and a mass block, the number of the fixed support, the number of the fixed hinged support and the number of the first telescopic rods are equal, one side of the first movable pull rod is connected with the first telescopic rods, the other side of the first movable pull rod is connected with one end of a folding elastic thin plate, the first telescopic rod is fixed in a rigid frame through a fixed support and a fixed hinge support, the mass block is bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic thin plate is stretched or extruded, so that the whole folding distance of the folding elastic thin plate is changed.
Furthermore, the active acoustic metamaterial structure unit further comprises a second telescopic rod, a second movable pull rod and a linear guide rail, the rigid frame is rectangular, the linear guide rail is fixed on the side wall of the rigid frame, one side of the second movable pull rod is connected with one side of the folding elastic thin plate, the other side of the second movable pull rod is connected with one end of the second telescopic rod, and the other end of the second telescopic rod can slide on the linear guide rail.
Furthermore, the active acoustic metamaterial structure unit further comprises a first guide rail sliding block, the other end of the second telescopic rod is connected with the first guide rail sliding block, and the first guide rail sliding block can slide in the linear guide rail.
Furthermore, the active acoustic metamaterial structure unit further comprises a second guide rail sliding block, two ends of the first movable pull rod are connected with the second guide rail sliding block, and the second guide rail sliding block can slide in the linear guide rail.
Further, the active acoustic metamaterial structure unit further comprises a sound velocity sensor attached to the mass block and used for acquiring a noise wave velocity signal in the environment.
Further, the mass blocks are made of tungsten, lead, copper or iron, and the number of the mass blocks is two or more.
Furthermore, the folding elastic thin plates are symmetrically distributed, the folding shape of the folding elastic thin plates is W-shaped or N-shaped, the folding elastic thin plates are made of hard plastics or hard metals, and the rigid frame is made of wood, steel, aluminum, glass or high polymer materials.
The invention also provides a control system of the active acoustic metamaterial structure unit, which further comprises a sound velocity sensor, a signal amplifier, an analog-to-digital converter, a calculation module and a transmission module, wherein the sound velocity sensor, the signal amplifier, the analog-to-digital converter, the calculation module and the transmission module are sequentially connected,
the sound velocity sensor is attached to the mass block and used for acquiring a noise wave velocity signal in the environment, transmitting the noise wave velocity signal to the signal amplifier, amplifying the noise wave velocity signal by the signal amplifier, transmitting the amplified noise wave velocity signal to the analog-to-digital converter, converting the amplified noise wave velocity signal into an electric signal by the analog-to-digital converter, and transmitting the electric signal to the calculation module,
the calculation module obtains the frequency characteristics of the noise sound waves according to the electric signals, obtains the folding distance of the folding elastic sheet according to the frequency characteristics, sends a control command of the folding distance to the transmission module, controls the movement of the first telescopic rod and the second telescopic rod through the transmission module, enables the first movable pull rod and the second movable pull rod to stretch or extrude the folding elastic sheet, and changes the resonance frequency of the active acoustic metamaterial structure unit by utilizing the change of the folding distance of the folding elastic sheet.
Further, the control system of the active acoustic metamaterial structure unit further comprises a sample holder, wherein the sample holder is connected between the signal amplifier and the analog-to-digital converter, and the sample holder is used for maintaining the stability of the noise wave speed signal and reducing the sampling error of the sound wave speed signal.
The embodiment of the invention also provides an acoustic metamaterial plate comprising the active acoustic metamaterial structural unit in any technical scheme, the acoustic metamaterial plate is formed by two-dimensional or three-dimensional periodic arrangement of the active acoustic metamaterial structural unit, and the folding intervals of the folding elastic thin plates in the resonant units are not limited to be consistent.
Compared with the prior art, the invention has the beneficial effects that: the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic sheet and a mass block, wherein the fixed support, the fixed hinged support and the first telescopic rod are all a plurality of same in number, one side of the first movable pull rod is connected with the first telescopic rod, the other side of the first movable pull rod is connected with one end of the folding elastic sheet, the first telescopic rod is fixed in the rigid frame through the fixed support and the fixed hinged support, the mass block is bonded on the folding elastic sheet, the movement of the first movable pull rod is controlled through the first telescopic rod, and the folding elastic sheet is stretched or extruded, so that the whole folding distance of the folding elastic sheet is changed; the sound insulation frequency band of the acoustic metamaterial is widened.
Drawings
Fig. 1 is a schematic diagram of an active acoustic metamaterial structural unit provided in embodiment 1 of the present invention;
fig. 2 is an enlarged view of a resonant unit in an active acoustic metamaterial unit provided in embodiment 1 of the present invention;
fig. 3 is a partially enlarged view of an active acoustic metamaterial unit provided in embodiment 1 of the present invention;
fig. 4 is a side view of an active acoustic metamaterial unit and a schematic control system thereof according to embodiment 2 of the present invention.
Reference numerals: 1-a rigid frame; 2-a resonant cell; 3-fixing a support; 4-fixed hinged support; 5-a first telescopic rod; 6-a first movable pull rod; 7-a folding elastic thin plate, 8-a mass block, 9-a sound velocity sensor and 10-a first guide rail sliding block; 11-a second telescopic rod; 12-a second moving tie-rod; 13-a second rail slide; 14-a linear guide rail; 15-a signal amplifier; 16-a sample holder; 17-an analog-to-digital converter; 18-a calculation module; 19-transmission module.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Example 1
The embodiment of the invention provides an active acoustic metamaterial structure unit, which comprises a rigid frame and a resonance unit, the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and a mass block, the number of the fixed support, the number of the fixed hinged support and the number of the first telescopic rods are equal, one side of the first movable pull rod is connected with the first telescopic rods, the other side of the first movable pull rod is connected with one end of a folding elastic thin plate, the first telescopic rod is fixed in a rigid frame through a fixed support and a fixed hinge support, the mass block is bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic thin plate is stretched or extruded, so that the whole folding distance of the folding elastic thin plate is changed.
In one specific implementation, a schematic diagram of an active acoustic metamaterial structural unit is shown in fig. 1, a partial enlarged view of the active acoustic metamaterial structural unit is shown in fig. 3, the active acoustic metamaterial structural unit comprises a rigid frame 1 and a resonance unit 2, the resonance unit 2 comprises a fixed support 3, a fixed hinged support 4, a first telescopic rod 5, a first movable pull rod 6, a folding elastic thin plate 7, a mass block 8, a sound velocity sensor 9, a first guide rail slider 10, a second telescopic rod 11, a second movable pull rod 12, a second guide rail slider 13 and a linear guide rail 14,
a mass block 8 is bonded on the folded elastic sheet 7, a sound velocity sensor 9 is attached to the mass block 8, two ends of the folded elastic sheet 8 are connected with the two first movable pull rods 6, and two sides of the folded elastic sheet are connected with the four second movable pull rods 12; two ends of the first movable pull rod 6 are connected with a second guide rail sliding block 13, the second guide rail sliding block 13 can slide in a linear guide rail 14, and the linear guide rail 14 is fixed on the side wall of the rigid frame 1; the second movable pull rod 12 is connected with a second telescopic rod 11, the second telescopic rod 11 is connected with a first guide rail sliding block 10, and the first guide rail sliding block 10 can slide in a linear guide rail 14; one side of the first movable pull rod 6 is connected with two first telescopic rods 5, and the first telescopic rods 5 are fixed in the rigid frame 1 through a fixed support 3 and a fixed hinged support 4;
preferably, the active acoustic metamaterial structure unit further comprises a second telescopic rod, a second movable pull rod and a linear guide rail, the rigid frame is rectangular, the linear guide rail is fixed on the side wall of the rigid frame, one side of the second movable pull rod is connected with one side of the folding elastic thin plate, the other side of the second movable pull rod is connected with one end of the second telescopic rod, and the other end of the second telescopic rod can slide on the linear guide rail;
preferably, the active acoustic metamaterial structure unit further comprises a first guide rail sliding block, the other end of the second telescopic rod is connected with the first guide rail sliding block, and the first guide rail sliding block can slide in the linear guide rail;
preferably, the active acoustic metamaterial structure unit further comprises a second guide rail slider, two ends of the first movable pull rod are connected with the second guide rail slider, and the second guide rail slider can slide in the linear guide rail;
in a specific embodiment, the schematic diagram of the active acoustic metamaterial structural unit is shown in fig. 1, and the schematic diagram of the active acoustic metamaterial structural unit with an enlarged resonance unit is shown in fig. 2, where the folded elastic sheet 7 and the mass block 8 may be equivalent to a mass-spring system, and if the frequency of external noise is the same as or close to the natural frequency of the system, the mass-spring system resonates to convert sound energy into internal energy, thereby effectively suppressing noise; if the frequency of the external noise is not consistent with the natural frequency of the system, the sound insulation effect is not optimal, the stretching of the first telescopic rod 5 and the second telescopic rod 11 can be controlled at the moment, the first movable pull rod 6 and the second movable pull rod 12 are driven to move, the folding elastic thin plate 7 is stretched or extruded, the elastic coefficient of the folding elastic thin plate is changed due to the change of the folding distance d, the natural frequency of the mass-spring system is changed accordingly, and the active control of the noise can be realized by controlling the natural frequency of the system to be the same as or similar to the frequency of the noise;
preferably, the active acoustic metamaterial structure unit further comprises a sound velocity sensor attached to the mass block for acquiring a noise wave velocity signal in the environment.
Preferably, the mass blocks are made of tungsten, lead, copper or iron, and the number of the mass blocks is two or more.
Preferably, the folding elastic sheets are symmetrically distributed, the folding shape of the folding elastic sheets is W-shaped or N-shaped, the folding elastic sheets are made of hard plastics or hard metals, and the rigid frame is made of wood, steel, aluminum, glass or high polymer materials;
the width of the folding thin plate is smaller than that of the inner edge of the rigid frame, and hard metal is preferably adopted; the elastic coefficient of the laminated thin plate can be changed by adjusting the folding distance;
rigid frame mainly plays the supporting role, and under satisfying rigidity and intensity ground requirement, optimize its structural parameter and can alleviate rigid frame 1's quality, reach the purpose of lightweight, preferred adoption light plank or light aluminum alloy, the width of folded form sheet metal is less than rigid frame's interior limit width, under the prerequisite of controlling the noise effectively, does not influence the through-flow that dispels the heat of resonance unit.
Example 2
The embodiment of the invention provides a control system of an active acoustic metamaterial structure unit, which comprises a rigid frame and a resonance unit, the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and a mass block, the number of the fixed support, the number of the fixed hinged support and the number of the first telescopic rods are equal, one side of the first movable pull rod is connected with the first telescopic rods, the other side of the first movable pull rod is connected with one end of a folding elastic thin plate, the first telescopic rod is fixed in a rigid frame through a fixed support and a fixed hinge support, the mass block is bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic sheet is stretched or extruded, so that the whole folding distance of the folding elastic sheet is changed;
the device also comprises a sound velocity sensor, a signal amplifier, an analog-to-digital converter, a calculation module and a transmission module which are connected in sequence,
the sound velocity sensor is attached to the mass block and used for acquiring a noise wave velocity signal in the environment, transmitting the noise wave velocity signal to the signal amplifier, amplifying the noise wave velocity signal by the signal amplifier, transmitting the amplified noise wave velocity signal to the analog-to-digital converter, converting the amplified noise wave velocity signal into an electric signal by the analog-to-digital converter, and transmitting the electric signal to the calculation module,
the calculation module obtains the frequency characteristics of the noise sound waves according to the electric signals, obtains the folding distance of the folding elastic sheet according to the frequency characteristics, sends a control command of the folding distance to the transmission module, controls the movement of the first telescopic rod and the second telescopic rod through the transmission module, enables the first movable pull rod and the second movable pull rod to stretch or extrude the folding elastic sheet, and changes the resonance frequency of the active acoustic metamaterial structure unit by utilizing the change of the folding distance of the folding elastic sheet.
Preferably, the control system of the active acoustic metamaterial structure unit further comprises a sample holder connected between the signal amplifier and the analog-to-digital converter, and the sample holder is used for maintaining the stability of the noise wave speed signal and reducing the sampling error of the sound wave speed signal;
in a specific embodiment, as shown in fig. 4, the calculation module 18 obtains frequency characteristics of sound waves in an environment by using methods such as fourier transform, calculates a folding distance d of the folding elastic sheet according to a concentrated region of the sound waves and an optimal sound absorption effect, and transmits a control instruction to the transmission module 19; the transmission module 19 respectively stretches or extrudes the folding elastic thin plate 7 by controlling the movement of the first telescopic rod 5 and the second telescopic rod 11, changes the resonance frequency of the resonance unit 2 by using the change of the folding distance d of the folding elastic thin plate 7, and actively adjusts the position of a high transmission loss frequency band by controlling the sound insulation peak frequency to be the same as or close to the noise frequency so as to achieve the purpose of broadband sound insulation and noise reduction.
The first moving pull rod 6 and the second moving pull rod 12 can move along the guide rail 14 fixed on the rigid frame 1 along with the second guide rail slider 13 and the first guide rail slider 10, respectively, and when the first moving pull rod 6 and the second moving pull rod 12 stretch or extrude the folding elastic thin plate 7, the whole folding distance d of the folding elastic thin plate 7 can be changed uniformly.
Example 3
The embodiment of the invention also provides an acoustic metamaterial plate comprising the active acoustic metamaterial structural unit in any one of the embodiments, the active acoustic metamaterial structural unit is formed by two-dimensional or three-dimensional periodic arrangement, and the folding intervals of the folding elastic thin plates in the resonant units are not limited to be consistent; the folding distances d of the folding elastic thin plates 7 in the resonance units 2 can be the same or different, the sound insulation frequency band of the whole composite structure can be widened through periodic arrangement, and the acoustic metamaterial plate structure has good application prospects in sound insulation and noise reduction in carrying equipment, production buildings, weaponry, engineering equipment with high heat dissipation through-flow requirements and the like.
It should be noted that the descriptions of examples 1 to 3 are not repeated and can be referred to each other.
The invention discloses an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate, by arranging the resonance unit in the rigid frame, the resonance unit comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and a mass block, the number of the fixed support, the number of the fixed hinged support and the number of the first telescopic rods are equal, one side of the first movable pull rod is connected with the first telescopic rods, the other side of the first movable pull rod is connected with one end of a folding elastic thin plate, the first telescopic rod is fixed in a rigid frame through a fixed support and a fixed hinge support, the mass block is bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic sheet is stretched or extruded, so that the whole folding distance of the folding elastic sheet is changed; the sound insulation frequency band of the acoustic metamaterial is widened;
the technical scheme of the invention can aim at the noises with different frequencies, has an active parameter adjusting function, actively adjusts the position of a high transmission loss frequency band, realizes active control of the noises, and overcomes the limitation of single sound insulation frequency band of the traditional sound insulation material and the sound insulation device; compared with the film type acoustic metamaterial, the folded elastic thin plate is used as a harmonic oscillator, so that the service life is longer, and the phenomenon that the working frequency band drifts due to the change of the prestress of the film caused by aging or temperature change is avoided; the width of the folding elastic thin plate is smaller than that of the inner edge of the rigid frame, so that the heat flow, the airflow and the like are ensured to pass on the premise of effectively inhibiting noise transmission, and the folding elastic thin plate has the functions of heat dissipation and through flow; the broadband folding type active acoustic metamaterial structure unit can work independently, can be arranged and combined in a two-dimensional or three-dimensional periodic manner to form an acoustic metamaterial plate, and can remarkably widen a sound insulation frequency band; the sound insulation and noise reduction device has the advantages of simple structure, easiness in processing and manufacturing, simplicity and convenience in implementation, wide application range and suitability for sound insulation and noise reduction of carrying equipment, production and construction, weaponry, equipment with high heat dissipation through-flow requirements and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. An active acoustic metamaterial structure unit is characterized by comprising a rigid frame and a resonant unit, the resonance unit is arranged in the rigid frame and comprises a fixed support, a fixed hinged support, a first telescopic rod, a first movable pull rod, a folding elastic thin plate and a mass block, the number of the fixed support, the number of the fixed hinged support and the number of the first telescopic rods are equal, one side of the first movable pull rod is connected with the first telescopic rods, the other side of the first movable pull rod is connected with one end of a folding elastic thin plate, the first telescopic rod is fixed in a rigid frame through a fixed support and a fixed hinge support, the mass block is bonded on the folding elastic thin plate, the first telescopic rod controls the movement of the first movable pull rod, and the folding elastic thin plate is stretched or extruded, so that the whole folding distance of the folding elastic thin plate is changed.
2. The active acoustic metamaterial unit structure of claim 1, further comprising a second telescopic bar, a second movable pull bar, and a linear guide, wherein the rigid frame is rectangular, the linear guide is fixed on a side wall of the rigid frame, one side of the second movable pull bar is connected with one side of the folded elastic sheet, the other side of the second movable pull bar is connected with one end of the second telescopic bar, and the other end of the second telescopic bar can slide on the linear guide.
3. The active acoustic metamaterial unit of claim 2, further comprising a first rail block, wherein the other end of the second telescoping rod is connected to the first rail block, and the first rail block is slidable in the linear rail.
4. The active acoustic metamaterial unit structure of claim 2, further comprising a second rail block, wherein the two ends of the first movable pull rod are connected with the second rail block, and the second rail block can slide in the linear rail.
5. The active acoustic metamaterial unit of claim 1, further comprising a sound speed sensor attached to the mass for acquiring a noise wave speed signal in an environment.
6. The active acoustic metamaterial unit of claim 1, wherein the masses are made of tungsten, lead, copper, or iron, and the number of masses is two or more.
7. The active acoustic metamaterial unit structure of claim 1, wherein the folded elastic sheets are symmetrically distributed, the folded shape of the folded elastic sheets is W-shaped or N-shaped, the folded elastic sheets are made of rigid plastic or rigid metal, and the rigid frame is made of wood, steel, aluminum, glass or polymer material.
8. The control system of the active acoustic metamaterial unit structure of claim 2, further comprising a sound velocity sensor, a signal amplifier, an analog-to-digital converter, a calculation module, and a transmission module, wherein the sound velocity sensor, the signal amplifier, the analog-to-digital converter, the calculation module, and the transmission module are connected in sequence,
the sound velocity sensor is attached to the mass block and used for acquiring a noise wave velocity signal in the environment, transmitting the noise wave velocity signal to the signal amplifier, amplifying the noise wave velocity signal by the signal amplifier, transmitting the amplified noise wave velocity signal to the analog-to-digital converter, converting the amplified noise wave velocity signal into an electric signal by the analog-to-digital converter, and transmitting the electric signal to the calculation module,
the calculation module obtains the frequency characteristics of the noise sound waves according to the electric signals, obtains the folding distance of the folding elastic sheet according to the frequency characteristics, sends a control command of the folding distance to the transmission module, controls the movement of the first telescopic rod and the second telescopic rod through the transmission module, enables the first movable pull rod and the second movable pull rod to stretch or extrude the folding elastic sheet, and changes the resonance frequency of the active acoustic metamaterial structure unit by utilizing the change of the folding distance of the folding elastic sheet.
9. The control system of claim 8, further comprising a sample holder connected between the signal amplifier and the analog-to-digital converter, wherein the sample holder is configured to maintain stability of the noise wave speed signal and reduce a sampling error of the acoustic wave speed signal.
10. An acoustic metamaterial panel comprising the active acoustic metamaterial structural elements of any of claims 1-7 formed from a two or three dimensional periodic arrangement of active acoustic metamaterial structural elements without limiting the folding pitch of the folded elastic sheets in each resonant cell to be uniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889489.8A CN112037750B (en) | 2020-08-28 | 2020-08-28 | Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889489.8A CN112037750B (en) | 2020-08-28 | 2020-08-28 | Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112037750A true CN112037750A (en) | 2020-12-04 |
| CN112037750B CN112037750B (en) | 2024-02-02 |
Family
ID=73587140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010889489.8A Active CN112037750B (en) | 2020-08-28 | 2020-08-28 | Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112037750B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802043A (en) * | 2022-06-27 | 2022-07-29 | 质子汽车科技有限公司 | Vehicle cab and vehicle |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08129391A (en) * | 1994-10-31 | 1996-05-21 | Fujikura Ltd | Sound absorbing device |
| DE10018033C1 (en) * | 2000-04-04 | 2001-11-29 | Leibniz Inst Fuer Neurobiologi | Acoustic transducer has membrane(s) of elastic, non-magnetic or weakly magnetic material connected to conducting tracks on which Lorenz force acts |
| CN103996395A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Elastic membrane-type low-frequency sound insulation metamaterial structure |
| CN103996396A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Light two-component soft thin layer local resonance acoustic material structure |
| US20150170631A1 (en) * | 2013-12-17 | 2015-06-18 | AdBm Technologies LLC. | Underwater Noise Reduction System Using Open-Ended Resonator Assembly and Deployment Apparatus |
| US20150279345A1 (en) * | 2014-03-27 | 2015-10-01 | Abhishek Mathur | Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same |
| CN105845121A (en) * | 2016-04-19 | 2016-08-10 | 黄礼范 | Sound-insulating, ventilating and heat transfer enhancing acoustic metamaterial unit, composite structure and preparation method |
| CN206921469U (en) * | 2017-07-26 | 2018-01-23 | 安徽理工大学 | A kind of collapsible resonance muffling composite device |
| WO2018047153A1 (en) * | 2016-09-12 | 2018-03-15 | Acoustic Metamaterials Group Limited | Acoustic metamaterial sound absorber |
| CN109003598A (en) * | 2018-06-13 | 2018-12-14 | 西安交通大学 | Sheet-type acoustic metamaterial sound insulation room structure |
| CN109616092A (en) * | 2019-01-24 | 2019-04-12 | 中国人民解放军国防科技大学 | Metamaterial type light structure with low-frequency vibration and noise reduction and sound insulation functions |
| KR20200022230A (en) * | 2018-08-22 | 2020-03-03 | 국방과학연구소 | Helmholtz resonator with tunable resonant frequency and resonant frequency tunable method thereof |
| CN111489728A (en) * | 2019-12-13 | 2020-08-04 | 中国舰船研究设计中心 | Active acoustic metamaterial based on local resonance |
-
2020
- 2020-08-28 CN CN202010889489.8A patent/CN112037750B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08129391A (en) * | 1994-10-31 | 1996-05-21 | Fujikura Ltd | Sound absorbing device |
| DE10018033C1 (en) * | 2000-04-04 | 2001-11-29 | Leibniz Inst Fuer Neurobiologi | Acoustic transducer has membrane(s) of elastic, non-magnetic or weakly magnetic material connected to conducting tracks on which Lorenz force acts |
| US20150170631A1 (en) * | 2013-12-17 | 2015-06-18 | AdBm Technologies LLC. | Underwater Noise Reduction System Using Open-Ended Resonator Assembly and Deployment Apparatus |
| US20150279345A1 (en) * | 2014-03-27 | 2015-10-01 | Abhishek Mathur | Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same |
| CN103996395A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Elastic membrane-type low-frequency sound insulation metamaterial structure |
| CN103996396A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Light two-component soft thin layer local resonance acoustic material structure |
| CN105845121A (en) * | 2016-04-19 | 2016-08-10 | 黄礼范 | Sound-insulating, ventilating and heat transfer enhancing acoustic metamaterial unit, composite structure and preparation method |
| WO2018047153A1 (en) * | 2016-09-12 | 2018-03-15 | Acoustic Metamaterials Group Limited | Acoustic metamaterial sound absorber |
| CN206921469U (en) * | 2017-07-26 | 2018-01-23 | 安徽理工大学 | A kind of collapsible resonance muffling composite device |
| CN109003598A (en) * | 2018-06-13 | 2018-12-14 | 西安交通大学 | Sheet-type acoustic metamaterial sound insulation room structure |
| KR20200022230A (en) * | 2018-08-22 | 2020-03-03 | 국방과학연구소 | Helmholtz resonator with tunable resonant frequency and resonant frequency tunable method thereof |
| CN109616092A (en) * | 2019-01-24 | 2019-04-12 | 中国人民解放军国防科技大学 | Metamaterial type light structure with low-frequency vibration and noise reduction and sound insulation functions |
| CN111489728A (en) * | 2019-12-13 | 2020-08-04 | 中国舰船研究设计中心 | Active acoustic metamaterial based on local resonance |
Non-Patent Citations (4)
| Title |
|---|
| 吴九汇;马富银;张思文;沈礼;: "声学超材料在低频减振降噪中的应用评述", 机械工程学报, no. 13 * |
| 尹剑飞: "力学超材料研究进展与减振降噪应用", 《力学进展》, vol. 52, no. 3 * |
| 杨世礼: "弹性板波超材料研究进展", 《科学通报》, vol. 67, no. 12 * |
| 王贡献: "带背腔薄膜型声学超材料低频隔声特性分析", 《噪声与振动控制》, vol. 43, no. 1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802043A (en) * | 2022-06-27 | 2022-07-29 | 质子汽车科技有限公司 | Vehicle cab and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112037750B (en) | 2024-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Three-dimensional single-port labyrinthine acoustic metamaterial: Perfect absorption with large bandwidth and tunability | |
| CN111739500B (en) | Perforated sandwich plate underwater broadband sound absorption structure decorated by damping layer | |
| CN113192479B (en) | Thin-layer low-frequency underwater sound insulation metamaterial | |
| CN111696503B (en) | Impedance enhancement perforated honeycomb panel underwater sound absorption metamaterial structure | |
| KR20060092275A (en) | Sound absorbing structure | |
| CN109003598A (en) | Sheet-type acoustic metamaterial sound insulation room structure | |
| CN112037750A (en) | Active acoustic metamaterial structure unit, control system and acoustic metamaterial plate | |
| CN114030247B (en) | Sound absorption and insulation light composite board based on acoustic black hole | |
| CN111739501A (en) | Underwater sound absorption structure of damping lining level honeycomb perforated plate | |
| CN111883094A (en) | Honeycomb edge-folded structure film acoustic metamaterial | |
| CN111739502A (en) | Underwater sound absorption metamaterial with damping lining hexagonal honeycomb perforated plate | |
| Hou et al. | Expanding the strong absorption band by impedance matched mosquito-coil-like acoustic metamaterials | |
| CN117496934A (en) | Bearing and low-frequency broadband sound insulation vibration reduction multifunctional metamaterial structure and composite superstructure | |
| CN219225891U (en) | Composite multi-cell sound absorption structure | |
| CN111505127A (en) | Experimental device for surrounding type local resonance light dot matrix sandwich plate structure | |
| CN116913238A (en) | Gradient coupling acoustic super structure based on porous sound absorption material and design method | |
| CN113362793B (en) | Bidirectional rough parallel-arrangement micro-channel porous sound absorption structure | |
| CN113192481B (en) | Coiled Helmholtz resonator for low-frequency noise control | |
| CN114215209A (en) | Laminated sound absorption and insulation board | |
| CN210597696U (en) | Sound absorption composite structure unit and sound absorber array with same | |
| Wang et al. | A PVC plasticization electrically active laminated metamaterial with tunable sound insulating performance | |
| CN113628604B (en) | Spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption | |
| CN113362797B (en) | Rough folding type sub-wavelength low-frequency sound absorption structure | |
| Gai et al. | The effect of coaxial ring masses with different contact areas, mass, and distribution on membrane-type acoustical metamaterials’ transmission loss | |
| CN217847433U (en) | Metamaterial unit for low-frequency broadband efficient sound absorption and superstructure module thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |