CN112037750B - 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
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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
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Abstract
The invention relates to an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate, wherein 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 hinge support, a first telescopic rod, a first movable pull rod, a plurality of folding elastic thin plates and a mass block, the fixed support, the fixed hinge support and the first telescopic rod are all of the same 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 plates, the first telescopic rod is fixed in the rigid frame through the fixed support and the fixed hinge support, the mass block is adhered to the folding elastic thin plates, and the movement of the first movable pull rod is controlled through the first telescopic rod, so that the whole folding distance of the folding elastic thin plates is changed due to the fact that the folding elastic thin plates are stretched or extruded. 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
Vibration and noise problems widely exist in the fields of daily life, transportation, production building, national defense equipment and the like, low-frequency noise has the characteristics of longer wavelength, strong diffraction capacity, difficult attenuation of energy, and the control of the low-frequency noise is always a difficult point in a sound insulation and noise reduction technology, and strong noise is especially harmful to the health of a human body, causes fatigue failure of a mechanical structure, causes faults of precision instruments and equipment, reduces the operational performance and stealth capacity of weapons and the like; with rapid development of modern scientific technology and industrial technology, the need for noise control is increasing, and how to effectively realize low-frequency sound insulation and noise reduction has become a key technical problem to be solved 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 limited by mass law, and mainly realize the control of low-frequency noise in a mode of increasing the thickness of the structure. Through increasing 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. But the mass per unit area is doubled, the sound insulation amount is only increased by 6dB, and the sound insulation effect is not ideal. As the quality and thickness requirements of various instrument and equipment on the noise reduction material are more and more strict, the limitations of the traditional noise reduction material are more and more prominent; the acoustic metamaterial is a periodic structure with a structural dimension unit far smaller than the wavelength of sound waves, comprises a local resonance unit or other characteristic units, has many special properties such as negative refraction, negative mass density and the like which are not possessed by conventional materials in nature, 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, the acoustic metamaterial still has defects facing a complex acoustic environment, generally, the acoustic metamaterial controls low-frequency noise of a certain frequency band in a passive mode, once 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 the sound insulation characteristics of the structure are further improved. In addition, for the film type acoustic metamaterial, due to aging effect and temperature change, the pre-stress originally designed by the film is changed, so that the high transmission loss frequency band position is changed, and the sound insulation and noise reduction capability of the film type acoustic metamaterial is affected.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate for solving the problem of narrower acoustic frequency bands in the prior art.
The invention provides an active acoustic metamaterial structure unit which comprises a rigid frame and a resonance unit, wherein 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 of a plurality of and equal 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 adhered to the folding elastic sheet, and the movement of the first movable pull rod is controlled through the first telescopic rod, so that the folding elastic sheet is stretched or extruded, and the whole folding distance of the folding elastic sheet is changed.
Further, 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 sheet, 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.
Further, 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.
Further, 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, wherein the sound velocity sensor is attached to the mass block and is used for acquiring noise wave velocity signals 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.
Further, 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 plastic or hard metal, 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 noise wave velocity signals in the environment, transmitting the noise wave velocity signals to the signal amplifier, amplifying the noise wave velocity signals by the signal amplifier and transmitting the amplified noise wave velocity signals to the analog-to-digital converter, converting the amplified noise wave velocity signals into electric signals by the analog-to-digital converter and transmitting the electric signals to the computing module,
the calculation module obtains the frequency characteristic of noise sound waves according to the electric signals, obtains the folding distance of the folding elastic thin plate according to the frequency characteristic, sends a control instruction 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, stretches or extrudes the folding elastic thin plate by the first movable pull rod and the second movable pull rod, and changes the resonance frequency of the active acoustic metamaterial structural unit by utilizing the change of the folding distance of the folding elastic thin plate.
Further, the control system of the active acoustic metamaterial structure unit further comprises a sampling holder, wherein the sampling holder is connected between the signal amplifier and the analog-to-digital converter and is used for maintaining stability of a noise wave speed signal and reducing sampling errors of the sound wave speed signal.
The embodiment of the invention also provides an acoustic metamaterial plate comprising the active acoustic metamaterial structure units according to any one of the technical schemes, wherein the active acoustic metamaterial structure units are formed by two-dimensional or three-dimensional periodic arrangement, and the folding spacing of the folding elastic thin plates in each resonance unit is 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 of a plurality of same 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 adhered to 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 unit structure provided in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of a resonance unit in an active acoustic metamaterial unit structure provided in embodiment 1 of the present invention;
FIG. 3 is an enlarged view of a portion of an active acoustic metamaterial unit structure provided in embodiment 1 of the present invention;
fig. 4 is a side view of an active acoustic metamaterial unit and a schematic diagram of a control system thereof according to embodiment 2 of the present invention.
Reference numerals: 1-a rigid frame; a 2-resonant cell; 3-fixing the support; 4-fixing the hinged support; 5-a first telescopic rod; 6-a first movable pull rod; 7-folding elastic thin plates, 8-mass blocks, 9-sonic velocity sensors and 10-first guide rail sliding blocks; 11-a second telescopic rod; 12-a second movable pull rod; 13-a second rail slide; 14-linear guide rails; 15-a signal amplifier; 16-sample holders; 17-analog-to-digital converter; 18-a calculation module; 19-a transmission module.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended 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, wherein 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, the fixed support, the fixed hinged support and the first telescopic rod are all of a plurality of and equal 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 adhered to the folding elastic sheet, and the movement of the first movable pull rod is controlled through the first telescopic rod, so that the whole folding distance of the folding elastic sheet is changed by stretching or extrusion of the folding elastic sheet.
In one implementation, the active acoustic metamaterial structure unit is shown in a schematic view in fig. 1, and in a partial enlarged view in fig. 3, the active acoustic metamaterial structure unit comprises a rigid frame 1 and a resonance unit 2, wherein the resonance unit 2 comprises a fixed support 3, a fixed hinge support 4, a first telescopic rod 5, a first movable pull rod 6, a folding elastic sheet 7, a mass block 8, a sound velocity sensor 9, a first guide rail slide block 10, a second telescopic rod 11, a second movable pull rod 12, a second guide rail slide block 13 and a linear guide rail 14,
the mass block 8 is adhered to the folding elastic sheet 7, the sound velocity sensor 9 is attached to the mass block 8, two ends of the folding elastic sheet 8 are connected with the two first movable pull rods 6, and two sides of the folding elastic sheet are connected with the four second movable pull rods 12; the two ends of the first movable pull rod 6 are connected with a second guide rail slide block 13, the second guide rail slide 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 the second telescopic rod 11, the second telescopic rod 11 is connected with the first guide rail slide block 10, and the first guide rail slide block 10 can slide in the 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 the fixed support 3 and the fixed hinge 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, wherein 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 sheet, 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 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;
in one embodiment, the schematic diagram of the active acoustic metamaterial structure unit is shown in fig. 1, the enlarged schematic diagram of the resonance unit in the active acoustic metamaterial structure unit is shown in fig. 2, the folded elastic sheet 7 and the mass block 8 can be equivalent to a mass-spring system, if the frequency of external noise is the same as or similar to the natural frequency of the system, the mass-spring system resonates to convert sound energy into internal energy, and noise is effectively suppressed; if the frequency of external noise is inconsistent with the natural frequency of the system, the sound insulation effect is not optimal, the expansion and contraction 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 sheet 7 is subjected to stretching or extrusion, the elastic coefficient of the folding elastic sheet is changed due to the change of the folding interval d, the natural frequency of the mass-spring system is changed along with the change of the folding interval d, 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, and the sound velocity sensor is attached to the mass block and is used for acquiring noise wave velocity signals 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 plastic or hard metal, and the rigid frame is made of wood, steel, aluminum, glass or high polymer materials;
the width of the folded sheet is smaller than the width of the inner edge of the rigid frame, and hard metal is preferably adopted; the elastic coefficient of the stacked thin plates can be changed by adjusting the folding interval;
the rigid frame mainly plays a supporting role, the structural parameters of the rigid frame are optimized under the condition of meeting the requirements of rigidity and strength, the quality of the rigid frame 1 can be reduced, the purpose of light weight is achieved, preferably, a light wood board or light aluminum alloy is adopted, the width of the folding type thin board is smaller than the width of the inner edge of the rigid frame, and the radiating through flow of the resonance unit is not influenced on the premise of effectively controlling noise.
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, wherein 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 in a plurality and equal 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 adhered to the folding elastic sheet, and the movement of the first movable pull rod is controlled through the first telescopic rod, so that the whole folding distance of the folding elastic sheet is changed by stretching or extruding the folding elastic sheet;
the device also 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 noise wave velocity signals in the environment, transmitting the noise wave velocity signals to the signal amplifier, amplifying the noise wave velocity signals by the signal amplifier and transmitting the amplified noise wave velocity signals to the analog-to-digital converter, converting the amplified noise wave velocity signals into electric signals by the analog-to-digital converter and transmitting the electric signals to the computing module,
the calculation module obtains the frequency characteristic of noise sound waves according to the electric signals, obtains the folding distance of the folding elastic thin plate according to the frequency characteristic, sends a control instruction 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, stretches or extrudes the folding elastic thin plate by the first movable pull rod and the second movable pull rod, and changes the resonance frequency of the active acoustic metamaterial structural unit by utilizing the change of the folding distance of the folding elastic thin plate.
Preferably, the control system of the active acoustic metamaterial structure unit further comprises a sampling holder, wherein the sampling holder is connected between the signal amplifier and the analog-to-digital converter, and the sampling holder is used for maintaining stability of a noise wave speed signal and reducing sampling errors of the sound wave speed signal;
in a specific embodiment, as shown in fig. 4, the calculation module 18 obtains the frequency characteristics of the sound wave in the environment by using fourier transform and other methods, calculates the folding distance d of the folding elastic sheet according to the concentration area of the sound wave frequency and the optimal sound absorption effect, and transmits a control instruction to the transmission module 19; the transmission module 19 controls the movement of the first telescopic rod 5 and the second telescopic rod 11 to enable the first movable pull rod 6 and the second movable pull rod 12 to stretch or squeeze the folding elastic sheet 7 respectively, changes the resonance frequency of the resonance unit 2 by utilizing the change of the folding distance d of the folding elastic sheet 7, and actively adjusts the position of a high transmission loss frequency band by controlling the sound insulation peak frequency to be the same or similar to the noise frequency so as to achieve the purpose of wideband sound insulation and noise reduction.
The first movable pull rod 6 and the second movable pull rod 12 can respectively move along the guide rail 14 fixed on the rigid frame 1 along the second guide rail slide block 13 and the first guide rail slide block 10, and when the first movable pull rod 6 and the second movable pull rod 12 stretch or squeeze the folding elastic sheet 7, the whole folding distance d of the folding elastic sheet 7 can be uniformly changed.
Example 3
The embodiment of the invention also provides an acoustic metamaterial plate comprising the active acoustic metamaterial structure units according to any one of the embodiments, wherein the active acoustic metamaterial structure units are formed by two-dimensional or three-dimensional periodic arrangement, and the folding spacing of the folding elastic thin plates in each resonance unit is not limited to be consistent; the folding distance d of the folding elastic thin plates 7 in each resonance unit 2 can be the same or different, the sound insulation frequency band of the whole composite structure can be widened through periodical arrangement, and the acoustic metamaterial plate structure has good application prospect in carrying equipment, production buildings, weaponry, engineering equipment with high heat dissipation and ventilation requirements and the like.
It should be noted that the descriptions of examples 1 to 3 are not repeated and can be used as references to each other.
The invention discloses an active acoustic metamaterial structure unit, a control system and an acoustic metamaterial plate, wherein the resonance unit is arranged in a 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 of a plurality of and equal 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 adhered to the folding elastic sheet, and the movement of the first movable pull rod is controlled through the first telescopic rod, so that the whole folding distance of the folding elastic sheet is changed by stretching or extrusion of the folding elastic sheet; the sound insulation frequency band of the acoustic metamaterial is widened;
according to the technical scheme, the device has an active parameter adjusting function for noise with different frequencies, and can actively adjust the position of a high transmission loss frequency band, so that active control of the noise is realized, and the single limit of the sound insulation frequency band of the traditional sound insulation material and the sound insulation device is overcome; compared with a film type acoustic metamaterial, the folding elastic thin plate is used as a harmonic oscillator, so that the service life is longer, and the phenomenon of working frequency band drift caused by the change of prestress of the film due to aging or temperature change is avoided; the width of the folding elastic sheet is smaller than the width of the inner edge of the rigid frame, and on the premise of effectively inhibiting noise transmission, the heat flow, the air flow and the like are ensured to pass through, and the folding elastic sheet has the function of heat dissipation and ventilation; the broadband folding active acoustic metamaterial structure units 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; simple structure, easy processing and manufacturing, simple and convenient implementation, wide application range, and suitability for sound insulation and noise reduction of carrying equipment, production buildings, weaponry, equipment with high heat dissipation and ventilation requirements and the like.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides an initiative acoustics metamaterial structure unit, its characterized in that includes rigid frame and resonance unit, resonance unit sets up in rigid frame, resonance unit includes fixed bolster, fixed hinge support, first telescopic link, first removal pull rod, folding elastic sheet and quality piece, fixed bolster, fixed hinge support, first telescopic link are a plurality of, just fixed bolster, fixed hinge support, first telescopic link's number equals, first removal pull rod one side is connected with first telescopic link, first removal pull rod opposite side is connected with folding elastic sheet one end, first telescopic link passes through fixed bolster and fixed hinge support to be fixed in rigid frame, the quality piece bonds on the folding elastic sheet, through the motion of first removal pull rod of first telescopic link control, folding elastic sheet receives stretching or extrusion, makes the whole folding interval of folding elastic sheet obtain the change.
2. The active acoustic metamaterial structure unit according to claim 1, further comprising a second telescopic rod, a second movable pull rod and a linear guide rail, wherein 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 sheet, 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.
3. The active acoustic metamaterial structure unit according to claim 2, further comprising a first rail slider, wherein the other end of the second telescopic rod is connected to the first rail slider, and the first rail slider is slidable in a linear rail.
4. The active acoustic metamaterial structure unit according to claim 2, further comprising a second rail slider, wherein the first movable tie rod is connected at both ends to the second rail slider, and the second rail slider is slidable in a linear rail.
5. The active acoustic metamaterial structure unit of claim 1, further comprising a sound speed sensor attached to the mass for acquiring noise wave velocity signals in the environment.
6. The active acoustic metamaterial structure unit according to claim 1, wherein the mass blocks are made of tungsten, lead, copper or iron, and the number of the mass blocks is two or more.
7. The active acoustic metamaterial structure unit according to 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 hard plastic or hard metal, and the rigid frame is made of wood, steel, aluminum, glass or high polymer material.
8. A control system of an active acoustic metamaterial structure unit according to 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 sequentially connected,
the sound velocity sensor is attached to the mass block and used for acquiring noise wave velocity signals in the environment, transmitting the noise wave velocity signals to the signal amplifier, amplifying the noise wave velocity signals by the signal amplifier and transmitting the amplified noise wave velocity signals to the analog-to-digital converter, converting the amplified noise wave velocity signals into electric signals by the analog-to-digital converter and transmitting the electric signals to the computing module,
the calculation module obtains the frequency characteristic of noise sound waves according to the electric signals, obtains the folding distance of the folding elastic thin plate according to the frequency characteristic, sends a control instruction 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, stretches or extrudes the folding elastic thin plate by the first movable pull rod and the second movable pull rod, and changes the resonance frequency of the active acoustic metamaterial structural unit by utilizing the change of the folding distance of the folding elastic thin plate.
9. The control system of an active acoustic metamaterial unit according to claim 8, further comprising a sample holder coupled between the signal amplifier and the analog-to-digital converter, the sample holder for maintaining stability of the noise wave velocity signal and reducing sampling errors of the acoustic wave velocity signal.
10. An acoustic metamaterial panel comprising active acoustic metamaterial structure units as claimed in any one of claims 1 to 7, wherein the active acoustic metamaterial structure units are formed by two-dimensional or three-dimensional periodic arrangement without limiting that the folding pitch of the folded elastic sheets in each resonant unit must be uniform.
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