CN109148123A - For the acoustic metamaterial barrier system of transformer noise spatial characteristics - Google Patents
For the acoustic metamaterial barrier system of transformer noise spatial characteristics Download PDFInfo
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- CN109148123A CN109148123A CN201811003478.4A CN201811003478A CN109148123A CN 109148123 A CN109148123 A CN 109148123A CN 201811003478 A CN201811003478 A CN 201811003478A CN 109148123 A CN109148123 A CN 109148123A
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- acoustic metamaterial
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
Abstract
A kind of adjustable acoustic metamaterial barrier system for transformer noise spatial characteristics, is made of acoustic metamaterial barrier (3) and noise testing analysis system (2).Acoustic metamaterial barrier (3) is made of Meta Materials supporting support (7) and fractal structure acoustic metamaterial module (8).Meta Materials supporting support (7) is parallel with transformer sound source face (1).Fractal structure acoustic metamaterial module (8) is embedded in Meta Materials supporting support (4).Noise testing analysis system (2) measures the noise in acoustic metamaterial barrier (3) range, and analysis obtains spatial noise distribution character.According to spatial noise distribution character, the fractal structure acoustic metamaterial module (8) of different parameters is chosen.When sonic transmissions to acoustic metamaterial barrier (3), since acoustic metamaterial module (8) parameter is chosen according to corresponding position noise profile characteristic, the noise amplitude in target noise reduction region can be made to substantially reduce.
Description
Technical field
The present invention relates to a kind of acoustic metamaterial barriers.
Background technique
Transformer body noise is mainly derived from the vibration of iron core, winding, and noise concentrates on the frequency multiplication of 100Hz, with low frequency
Based on noise.Transformer fan noise is then the broadband noise between 500-2000Hz.With the construction in city, largely
110kV, 220kV substation become closer to inner city.The effects of noise transmission environment is complicated, the interference of sound wave, diffraction is led
Mutagens depressor noise problem becomes increasingly conspicuous, and inevitably has an impact to staff in standing and neighbouring resident.Therefore, how
Transformer noise is controlled in route of transmission, has become environmental protection administration and power department major issue urgently to be resolved.
Mainly have for the noise-reduction method of transformer noise at present: active noise reduction and material noise reduction.Active noise reduction is actively
Noise reduction, it is active as disclosed in Chinese patent CN106251855A " a kind of de-centralized virtual sound screen of for transformer noise reduction "
Sound barrier is mounted near the opening face in room, active by control sound source, error microphone, reference sensor, multiple single channels
Controller and peripheral circuit composition, can control the noise that sound source is radiated by outward opening in room.The advantages of active acoustic shielding
It is that control is flexible, the disadvantage is that it is difficult to control when array quantity increases.
Transformer body noise is based on low-frequency noise, the noise reduction of the sound barrier of traditional sound insulating material production to low-frequency noise
Poor effect.Acoustic metamaterial has the extraordinary physical characteristics such as negative refraction, strong reflection, negative mass density, negative bulk modulus, compares
Traditional material has many advantages, such as that oise insulation factor is big, thickness is small, and the control of material low-frequency noise of smaller size may be implemented, effectively make up
Traditional material barrier is difficult to obstruct the deficiency of low-frequency noise, has good development prospect in transformer noise reduction field.Chinese patent
The sound barrier that CN106192785A " a kind of full frequency band noise reduction barrier and screening arrangement for substation " is announced includes super material
Expect low frequency noise reduction layer and high frequency noise reduction layer, be placed near transformer, full frequency band noise is reduced on transformer noise propagation path.
The acoustic metamaterial barrier of patent disclosure does not consider the otherness of spatial noise distribution, and sound barrier is once established, cannot be according to sky
Between the variation of distribution of sound field be adjusted flexibly, cause noise reduction effect bad.
Summary of the invention
The purpose of the present invention is overcoming the prior art, propose a kind of for transformer noise spatial characteristics
Acoustic metamaterial barrier system.
Acoustic metamaterial barrier system of the present invention includes acoustic metamaterial barrier and noise testing analysis system, disposed within
Transformer ventilation opening outside or outdoor transformer surrounding.
The acoustic metamaterial barrier is made of Meta Materials supporting support and fractal structure acoustic metamaterial module, divides shape knot
In structure acoustic metamaterial Module-embedding Meta Materials supporting support.
When establishing acoustic metamaterial barrier, the noise that noise testing analysis system measures acoustic metamaterial barrier position is special
Property, it is distributed according to spatial noise, select each fractal structure acoustic metamaterial module of acoustic metamaterial barrier divides shape order
With sonic wave guide width parameter.When sound source changes, space sound field changes, again by noise testing analysis system
Noise is measured, according to the sound-filed simulation after variation, adjusts each fractal structure acoustic metamaterial module of acoustic metamaterial barrier
Divide shape order and sonic wave guide width parameter, with the fractal structure acoustic metamaterial of the acoustic metamaterial barrier after adjusting parameter
Fractal structure acoustic metamaterial module before module replacement.
The Meta Materials supporting support is cuboid.Top and bottom are removed, there are four the outer surfaces in direction for transformer.
The outer surface in any one direction of definition is transformer sound source face.Transformer sound source face and the Meta Materials supporting support are flat
Row, there is therebetween certain distance.The Meta Materials supporting support is provided with mxn rectangle with transformer sound source face face on one side
Through-hole, m, n are positive integer.Rectangular through-hole size is identical, equidistant to arrange, and forms array.
The fractal structure acoustic metamaterial module is in Meta Materials supporting support rectangular through-hole, and each rectangular through-hole
In fractal structure acoustic metamaterial module it is detachable.The fractal structure acoustic metamaterial module and transformer sound source face are flat
Row, the face close apart from transformer sound source face are acoustic wave inlet face, and the face remote apart from transformer sound source face is acoustic wave outlet face.With sound
Wave inlet face and the vertical face of sound wave exit face are the cross section of fractal structure acoustic metamaterial module.
The fractal structure acoustic metamaterial module is the array being made of fractal structure acoustic metamaterial unit.The sound
The cross section for learning metamaterial unit is the rectangular surfaces with one fixed width Hilbert shaped form channel.The Hilbert of one fixed width
Shaped form channel is known as sonic wave guide.
The sound insulation frequency of the fractal structure acoustic metamaterial unit and the close phase of width for dividing shape order and sonic wave guide
It closes.
Fractal structure acoustic metamaterial model of element is established, given acoustic metamaterial unit divides shape order and duct width
Parameter area, carry out the duct width parameter scanning under given point shape order, calculated by sound field, obtain given order and wave
Lead oise insulation factor of the acoustic metamaterial unit in different frequency of width.
The acoustic pressure of measurement point is calculated according to structure field and sound field coupled wave equation (1) and acoustic pressure wave equation (2).
Wherein, ρ0For mass density, v is vibration velocity, and p is acoustic pressure, and c is the velocity of sound,For Hamiltonian.
Wherein, ρ0For mass density, p is acoustic pressure, and c is the velocity of sound,For Hamiltonian, t is acoustic transit time.
According to the available sound pressure level of acoustic pressure:
Wherein, p is acoustic pressure, prefFor reference sound pressure, the world is taken as 2 × 10-5Pa, SPL are sound pressure level, are obtained according to sound pressure level
To oise insulation factor:
TL=SPL2-SPL1 (4)
Wherein, SPL2The sound pressure level of measurement point position, SPL when for for metamaterial unit is added1After metamaterial unit is added
The sound pressure level of measurement point position, TL are oise insulation factor.
The high frequency range of oise insulation factor is the optimal sound insulation frequency range of the acoustic metamaterial unit of given parameters.According to most
The excellent frequency range selection given fractal structure acoustic metamaterial unit corresponding with the sound insulation frequency range that insulates against sound divides shape order
With sonic wave guide width.
Air circulates in fractal structure acoustic metamaterial unit along sonic wave guide.
The noise testing analysis system is by sensor support bracket, sound pressure sensor and acoustic pressure signal processing module group
At.Sound pressure sensor is placed on sensor support bracket, and sound pressure signal processing module is connect with sound pressure sensor.
The sensor support bracket is parallel with Meta Materials supporting support, is arranged in Meta Materials supporting support nearby, and
The same side of transformer is located on Meta Materials supporting support.The sensor support bracket is rectangular parallelepiped structure, highly and super
The height of material barrier supporting support is equal, and width is less than the width of Meta Materials barrier supporting support.The sensor support branch
Frame includes multiple crossbeams and vertical beam, and crossbeam and vertical beam intersect to form multiple rectangular through-holes, and the size of each rectangular through-hole is identical, and
The length of rectangular through-hole is less than or equal to the 1/2 of Meta Materials supporting support rectangular through-hole length, and width is less than or equal to Meta Materials
The 1/2 of supporting support rectangular through-hole width.The sensor support bracket can be along the side parallel with acoustic metamaterial barrier
To movement.
The sound pressure sensor is placed in the intersection position of sensor support rack beam and vertical beam, forms sound pressure sensor battle array
Column.
The sound pressure signal processing module includes preamplifier, filter, A/D converter and dsp processor.Before described
The input terminal for setting amplifier is connect with sound pressure sensor, the noise signal of amplification sound pressure sensor acquisition；The filter it is defeated
Enter end to connect with the output end of the preamplifier, filters out the high fdrequency component in the noise signal of sound pressure sensor acquisition, it will
Collected acoustic pressure analog signal is sent by the output end of filter to A/D converter；Signal sent after A/D converter samples to
The input terminal of dsp processor；Noise signal is carried out interpolation calculation and spectrum analysis by dsp processor, obtains sensor support branch
Noise profile characteristic and spectral characteristic within the scope of frame.
The course of work of the present invention are as follows: sensor support bracket and Meta Materials supporting support spacing distance very little and parallel put
It sets, sensor support bracket is aligned with the outside vertical beam of Meta Materials supporting support.Noise testing analysis system, which measures and records, makes an uproar
Sound after being measured, keeps sensor support bracket with Meta Materials supporting support apart from constant, mobile noise testing analysis system
The noise profile for measuring next region, until measurement range covers entire acoustic metamaterial barrier.Analysis obtains acoustics
Spatial noise distribution character within the scope of Meta Materials barrier.Noise testing analysis system carries out frequency spectrum point to the noise of time-domain
Analysis, obtains the frequency domain characteristic of noise, to obtain the sound insulation frequency range of each rectangular through-hole position of Meta Materials supporting support.
According to the identical principle of sound insulation frequency range of optimal sound insulation frequency range and Meta Materials supporting support rectangular through-hole position, choose
In fractal structure acoustic metamaterial Module-embedding Meta Materials supporting support rectangular through-hole.The fractal structure acoustic metamaterial module
Acoustic metamaterial unit, dividing shape order and sonic wave guide width is sound insulation frequency model identical with optimal sound insulation frequency range
Enclose point shape order and sonic wave guide width of corresponding fractal structure acoustic metamaterial unit.When sound source changes, noise
Spatial distribution changes, and measures noise again by noise testing analysis system, according to the sound-filed simulation after variation, disassembly pair
It answers sound field to change the fractal structure acoustic metamaterial module at position, is replaced with for sound field characteristic after sound field variation
The fractal structure acoustic metamaterial module of design, the fractal structure acoustic metamaterial mould designed for sound field characteristic after sound field variation
The fractal structure acoustic metamaterial unit of block divides shape order and sonic wave guide width for the sound insulation frequency range after sound field variation
Corresponding fractal structure acoustic metamaterial unit divides shape order and sonic wave guide width.
When sonic transmissions to acoustic metamaterial barrier, since fractal structure acoustic metamaterial module parameter is according to correspondence
What position noise distribution character was chosen, the magnitudes of acoustic waves in target noise reduction region can be made to substantially reduce.
The present invention establishes adjustable acoustic metamaterial barrier for transformer noise spatial characteristics, can effectively pass
It broadcasts and obstructs transformer noise on path, reduce pollution from environmental noise.Compared to traditional sound barrier, when barrier is established, this hair
Bright adjustable acoustic metamaterial barrier system selects parting structure acoustic metamaterial module parameter according to actual measurement sound-filed simulation, can be improved
Noise reduction effect；Meanwhile when spatial noise changes in distribution, acoustic metamaterial module can be adjusted according to actual measurement noise profile, improved
The flexibility of sound barrier.
Detailed description of the invention
Fig. 1 adjustable acoustic metamaterial barrier system schematic diagram of the invention；
Fig. 2 adjustable acoustic metamaterial barrier system side view of the invention；
Fig. 3 noise testing analysis system front view of the present invention；
Fig. 4 acoustic metamaterial barrier front view of the present invention；
Fig. 5 sound pressure signal processing module structure chart of the present invention；
Fig. 6 acoustic metamaterial cell cross-section figure of the present invention.
In figure: 1 transformer sound source face, 2 noise testing analysis systems, 3 acoustic metamaterial barriers, 4 sensor support brackets,
5 sound pressure sensors, 6 sound pressure signal processing modules, 7 Meta Materials supporting supports, 8 fractal structure acoustic metamaterial modules are put before 9
Big device, 10 filters, 11A/D converter, 12DSP processor, 13 single order fractal structure acoustic metamaterial cell cross-sections, 12 2
Rank fractal structure acoustic metamaterial cell cross-section, 13 3 rank fractal structure acoustic metamaterial cell cross-sections, 14 quadravalences divide shape
Structural acoustic metamaterial unit cross section.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As depicted in figs. 1 and 2, the present invention is directed to the adjustable acoustic metamaterial barrier system of transformer noise spatial characteristics
System, transformer ventilation opening outside disposed within or outdoor transformer surrounding, including acoustic metamaterial barrier 3 and noise testing analysis
System 2.
As shown in figure 4, the acoustic metamaterial barrier 3 is by Meta Materials supporting support 7 and fractal structure acoustic metamaterial mould
Block 8 forms, and the fractal structure acoustic metamaterial module 8 is in Meta Materials supporting support 7.
The Meta Materials supporting support 7 is cuboid.Top and bottom are removed, there are four the outer profiles in direction for transformer
Face.The outer surface in any one direction of definition is transformer sound source face.Transformer sound source face 1 and the Meta Materials supporting support
7 is parallel, there is certain distance therebetween.The Meta Materials supporting support 7 is provided with mxn with 1 face of transformer sound source face on one side
A rectangular through-hole, m, n are positive integer.Rectangular through-hole size is identical, equidistant to arrange, and forms array.
The fractal structure acoustic metamaterial module 8 is in the rectangular through-hole of Meta Materials supporting support 7, and each rectangle
Fractal structure acoustic metamaterial module 8 in through-hole is detachable, is replaced.The fractal structure acoustic metamaterial module 8 with
Parallel and close apart from the transformer sound source face face in transformer sound source face 1 is acoustic wave inlet face, the face remote apart from transformer sound source face 1
For acoustic wave outlet face.The face vertical with acoustic wave inlet face and sound wave exit face is the transversal of fractal structure acoustic metamaterial module 8
Face.
The fractal structure acoustic metamaterial module 8 is the array being made of fractal structure acoustic metamaterial unit.It is described
The cross section of fractal structure acoustic metamaterial unit is the rectangular surfaces with one fixed width Hilbert shaped form channel, such as Fig. 6 institute
Show.The fractal structure acoustic metamaterial unit section form can be single order 11, second order 12, three ranks 13 or quadravalence 14.It is described
The order of fractal structure acoustic metamaterial unit and the width of sonic wave guide and sound insulation frequency are closely related.
Fractal structure acoustic metamaterial model of element is established, given acoustic metamaterial unit divides shape order and duct width
Parameter area, carry out the duct width parameter scanning under given point shape order, calculated by sound field, obtain given order and wave
Lead oise insulation factor of the acoustic metamaterial unit in different frequency of width.
The acoustic pressure of measurement point is calculated according to structure field and sound field coupled wave equation (1) and acoustic pressure wave equation (2).
Wherein, ρ0For mass density, v is vibration velocity, and p is acoustic pressure, and c is the velocity of sound,For Hamiltonian.
Wherein, ρ0For mass density, p is acoustic pressure, and c is the velocity of sound,For Hamiltonian, t is acoustic transit time.
According to the available sound pressure level of acoustic pressure:
Wherein, p is acoustic pressure, prefFor reference sound pressure, the world is taken as 2 × 10-5Pa, SPL are sound pressure level, are obtained according to sound pressure level
To oise insulation factor:
TL=SPL2-SPL1 (4)
Wherein, SPL2The sound pressure level of measurement point position, SPL when for for metamaterial unit is added1After metamaterial unit is added
The sound pressure level of measurement point position, TL are oise insulation factor.
The high frequency range of oise insulation factor is the optimal sound insulation frequency range of the acoustic metamaterial unit of given parameters.According to most
Excellent sound insulation frequency range selects point of the corresponding given fractal structure acoustic metamaterial unit of same sound insulation frequency range
Shape order and sonic wave guide width.
The noise testing analysis system 2 is by sensor support bracket 4, sound pressure sensor 5 and acoustic pressure signal processing module 6
Composition.Sound pressure sensor 5 is placed on sensor support bracket 4, and sound pressure signal processing module 6 is connect with sound pressure sensor 5.It is described
The front view of sensor support bracket 4 and sound pressure sensor 5 is as shown in Figure 3.
The sensor support bracket 4 is parallel with Meta Materials supporting support 7, is arranged in Meta Materials supporting support 7 nearby,
And the same side of transformer is located on Meta Materials supporting support 7.The sensor support bracket 4 be cuboid, height and
The height of Meta Materials supporting support 7 is equal, and width is less than the width of Meta Materials supporting support 7.The sensor support bracket 4 wraps
Multiple crossbeams and vertical beam are included, crossbeam and vertical beam intersect to form multiple rectangular through-holes, and the size of each rectangular through-hole is identical, and rectangle
The length of through-hole is less than or equal to the 1/2 of Meta Materials supporting support rectangular through-hole length, and the width of rectangular through-hole is less than or equal to
The 1/2 of Meta Materials supporting support rectangular through-hole width.The sensor support bracket 4 can along with Meta Materials supporting support 7
Parallel direction is mobile.
The sound pressure sensor 5 is placed in the intersection position of sensor support bracket 4 crossbeam and vertical beam, forms sound pressure sensor
Array.
The sound pressure signal processing module 6 includes preamplifier 9, filter 10, A/D converter 11 and dsp processor
12.The input terminal of the preamplifier 9 is connect with sound pressure sensor 5, the noise signal that amplification sound pressure sensor 5 acquires；Institute
The input terminal for stating filter 10 is connect with the output end of the preamplifier 9, filters out the noise signal of the acquisition of sound pressure sensor 5
In high fdrequency component, collected acoustic pressure analog signal is sent by the output end of filter 10 to A/D converter 11；Signal is through A/
It is sent after D sampling to the input terminal of dsp processor 12, noise signal is carried out spectrum analysis and interpolation calculation, obtained by dsp processor 12
To the noise profile and spectral characteristic in 3 range of acoustic metamaterial barrier.
The course of work of the present invention are as follows: sensor support bracket 4 and 7 spacing distance very little of Meta Materials supporting support and parallel put
It sets, the outside vertical beam alignment of two brackets.Noise testing analysis system 2 measures and records noise, after being measured, keeps sensing
Apart from constant, mobile noise testing analysis system measures the noise in next region for device supporting support 4 and Meta Materials supporting support 7
Distribution, until measurement range covers entire acoustic metamaterial barrier 3.Analysis obtains making an uproar within the scope of acoustic metamaterial barrier
Sound spatial characteristics.Noise testing analysis system carries out spectrum analysis to the noise of time-domain, and the frequency domain for obtaining noise is special
Property, to obtain the sound insulation frequency range of each rectangular through-hole position noise of Meta Materials supporting support 7.According to optimal sound insulation frequency
The identical principle of sound insulation frequency range of range and Meta Materials supporting support rectangular through-hole position chooses the super material of fractal structure acoustics
Expect that module 8 is embedded in the rectangular through-hole of Meta Materials supporting support 7, the acoustic metamaterial of the fractal structure acoustic metamaterial module
Unit, divides shape order and sonic wave guide width is that required sound insulation frequency range identical with optimal sound insulation frequency range is corresponding
Fractal structure acoustic metamaterial unit divides shape order and sonic wave guide width.When sound source changes, space sound field occurs
Variation measures noise again by noise testing analysis system 2, and according to the sound-filed simulation after variation, disassembly corresponds to sound field
Fractal structure acoustic metamaterial module 8 at change location is replaced with for point shape knot that sound field characteristic designs after variation
Structure acoustic metamaterial module 8, the fractal structure acoustic metamaterial module that sound field characteristic designs after changing for sound field divide shape knot
Structure acoustic metamaterial unit divides shape order and sonic wave guide width corresponding for the required sound insulation frequency range after sound field variation
Fractal structure acoustic metamaterial unit divides shape order and sonic wave guide width.When sonic transmissions to acoustic metamaterial barrier 3,
Since the parameter of fractal structure acoustic metamaterial module 8 is chosen according to corresponding position noise profile characteristic, target can be made to drop
The magnitudes of acoustic waves in region of making an uproar substantially reduces.
Claims (10)
1. a kind of acoustic metamaterial barrier system for transformer noise spatial characteristics, it is characterised in that: the acoustics
Meta Materials barrier system transformer ventilation opening outside disposed within or outdoor transformer surrounding, including acoustic metamaterial barrier (3)
With noise testing analysis system (2)；
The acoustic metamaterial barrier (3) is made of Meta Materials supporting support (7) and fractal structure Meta Materials module (8), institute
Fractal structure acoustic metamaterial module (8) is stated in Meta Materials supporting support (7)；
When establishing acoustic metamaterial barrier (3), noise testing analysis system (2) measurement acoustic metamaterial barrier (3) position is made an uproar
Sound characteristics are distributed according to spatial noise, select point of the fractal structure acoustic metamaterial module (8) of acoustic metamaterial barrier (3)
Shape order and sonic wave guide width parameter；When sound source changes, space sound field changes, noise testing analysis system
(2) noise is measured again, according to the sound-filed simulation after variation, adjusts the fractal structure acoustic metamaterial mould of acoustic metamaterial barrier
Block (8) divides shape order and sonic wave guide width parameter, with the fractal structure acoustics of the acoustic metamaterial barrier after adjusting parameter
Fractal structure acoustic metamaterial module (8) before Meta Materials module (8) replacement.
2. acoustic metamaterial barrier system according to claim 1, it is characterised in that: the Meta Materials supporting support
(7) it is rectangular parallelepiped structure, is arranged in parallel with transformer sound source face (1), there is distance therebetween；The Meta Materials supporting support
(7) mxn rectangular through-hole is provided on one side with transformer sound source face (1) face, m, n be positive integer；Rectangular through-hole size is identical,
Equidistant arrangement, forms array.
3. acoustic metamaterial barrier system according to claim 1 or 2, it is characterised in that: the fractal structure acoustics
Meta Materials module (8) is made of epoxide resin material, in Meta Materials supporting support (7) rectangular through-hole, and each rectangle
Acoustic metamaterial module (8) in through-hole is detachable.
4. acoustic metamaterial barrier system according to claim 1, it is characterised in that: the super material of fractal structure acoustics
Expect that module (8) are the rectangular parallelepiped structure with sonic wave guide and bottom plate, bottom plate is located at the bottom of rectangular parallelepiped structure, and sonic wave guide is solid
Due on bottom plate；Air circulates in fractal structure acoustic metamaterial module (8) along sonic wave guide.
5. acoustic metamaterial barrier system according to claim 1, it is characterised in that: the super material of fractal structure acoustics
Material module (8) is made of fractal structure acoustic metamaterial cell array；The cross section of the acoustic metamaterial unit is with one
The rectangular surfaces in fixed width degree Hilbert shaped form channel；The order of the fractal structure acoustic metamaterial unit and sonic wave guide
Width and sound insulation frequency dependence；
Fractal structure acoustic metamaterial model of element is established, the order of acoustic metamaterial unit and the parameter model of duct width are given
It encloses, carries out the duct width parameter scanning of the acoustic metamaterial module under given order, calculated by sound field, obtain given order
With the acoustic metamaterial unit of duct width different frequency oise insulation factor；The high frequency range of oise insulation factor is given parameters acoustics
The optimal sound insulation frequency range of metamaterial unit；Sound corresponding with the sound insulation frequency range is selected according to optimal sound insulation frequency range
That learns the fractal structure acoustic metamaterial unit of metamaterial unit divides shape order and sonic wave guide width.
6. acoustic metamaterial barrier system according to claim 1, it is characterised in that: noise testing analysis system (2) by
Sensor support bracket (4), sound pressure sensor (5) and acoustic pressure signal processing module (6) composition；Sound pressure sensor (5) is placed in biography
In sensor supporting support (4), sound pressure signal processing module (6) is connect with sound pressure sensor (5).
7. acoustic metamaterial barrier system according to claim 6, it is characterised in that: the sensor support bracket (4)
It is parallel with Meta Materials supporting support (7), it is arranged in Meta Materials supporting support (7) nearby, and same with Meta Materials supporting support (7)
Positioned at the same side of transformer；The sensor support bracket (4) be rectangular parallelepiped structure, highly with Meta Materials barrier supporting support
(7) height is mutually same, and width is less than the width of Meta Materials barrier supporting support (7)；The sensor support bracket (4) includes
Multiple crossbeams and vertical beam, crossbeam and vertical beam intersect to form multiple rectangular through-holes, and the size of each rectangular through-hole is identical, and rectangle is logical
The length in hole is less than or equal to the 1/2 of Meta Materials supporting support rectangular through-hole length, and the width of rectangular through-hole is less than or equal to super
The 1/2 of materials for support bracket rectangular through-hole width；The sensor support bracket can be along parallel with acoustic metamaterial barrier
Direction it is mobile.
8. acoustic metamaterial barrier system according to claim 6, it is characterised in that: the sound pressure sensor (5) is set
In the intersection position of sensor support bracket (4) crossbeam and vertical beam, sound pressure sensor array is formed.
9. acoustic metamaterial barrier system according to claim 6, it is characterised in that: the sound pressure signal processing module
It (6) include preamplifier, filter, A/D converter and dsp processor；The input terminal and acoustic pressure of the preamplifier pass
Sensor (5) connection, the noise signal of amplification sound pressure sensor acquisition；The input terminal of the filter and the preamplifier
Output end connection, filter out sound pressure sensor acquisition noise signal in high fdrequency component, by collected acoustic pressure analog signal by
The output end of filter is sent to A/D conversion module；Signal is sent after A/D converter samples to the input terminal of dsp processor, DSP
Noise signal is carried out spectrum analysis and interpolation calculation by processor, obtains the noise profile characteristic within the scope of sensor support bracket
And spectral characteristic.
10. acoustic metamaterial barrier system according to claim 1, it is characterised in that: the sound pressure sensor support
Bracket (4) is aligned with the outside vertical beam of Meta Materials supporting support (7)；Noise testing analysis system (2) measures noise profile, measurement
After the completion, keep sound pressure sensor supporting support (4) with Meta Materials supporting support (7) apart from constant, mobile noise testing analysis
System (2) measures the noise profile in next region, until measurement range covers entire Meta Materials barrier (3)；Noise is surveyed
It measures analysis system and spectrum analysis is carried out to the noise of time-domain, obtain the frequency domain characteristic of noise, to obtain Meta Materials support
The sound insulation frequency range of each rectangular through-hole position noise of bracket (7), according to optimal sound insulation frequency range and Meta Materials support branch
The identical principle of sound insulation frequency range of frame rectangular through-hole position chooses fractal structure acoustic metamaterial module (8) and is embedded in super material
In the rectangular through-hole for expecting supporting support (7)；The acoustic metamaterial unit of the fractal structure acoustic metamaterial module (8), point
Shape order and sonic wave guide width be it is identical with optimal sound insulation frequency range needed for insulate against sound the corresponding fractal structure of frequency range
Acoustic metamaterial unit divides shape order and sonic wave guide width；When sound source changes, spatial noise distribution changes,
Noise is measured again by noise testing analysis system, according to the sound-filed simulation after variation, corresponding sound field is dismantled and changes position
The fractal structure acoustic metamaterial module (8) for setting place is replaced with for point shape knot that sound field characteristic designs after sound field variation
Structure acoustic metamaterial module (8)；Divide shape in the fractal structure acoustic metamaterial module (8) designed for sound field characteristic after variation
Structural acoustic metamaterial unit divides shape order and sonic wave guide width corresponding for the required sound insulation frequency range after sound field variation
Fractal structure acoustic metamaterial unit divide shape order and sonic wave guide width.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111524497A (en) * | 2020-04-21 | 2020-08-11 | 中国科学院电工研究所 | Fractal structure acoustic metamaterial based on electrorheological fluid |
| CN112286255A (en) * | 2020-09-29 | 2021-01-29 | 北京空间飞行器总体设计部 | On-orbit noise evaluation method for high-stability temperature measurement and control system |
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| CN112286255B (en) * | 2020-09-29 | 2021-09-24 | 北京空间飞行器总体设计部 | On-orbit noise evaluation method for high-stability temperature measurement and control system |
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