CN110390926A - A kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation - Google Patents
A kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation Download PDFInfo
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- CN110390926A CN110390926A CN201910567536.4A CN201910567536A CN110390926A CN 110390926 A CN110390926 A CN 110390926A CN 201910567536 A CN201910567536 A CN 201910567536A CN 110390926 A CN110390926 A CN 110390926A
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- elastic wave
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
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Abstract
The invention discloses a kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation, the elastic wave channel including multiple parallel arrangements；Each elastic wave channel includes several piezoelectric photonic crystal units according to one dimensional lattice periodic arrangement；Each piezoelectric photonic crystal unit includes substrate, the PZT (piezoelectric transducer) being fixed on substrate and the shunt circuit being connected on PZT (piezoelectric transducer)；The elastic wave phase for injecting the elastic wave channel is modulated in each elastic wave channel by shunt circuit so that the elastic wave that multiple elastic wave channels are projected generate phase difference and from cancellation.The electrical parameter that the present invention passes through the shunt circuit of the piezoelectric photonic crystal unit in each elastic wave channel of adjusting, change the phase of elastic wave, the principle of the interference cancellation utilized, under the premise of not changing phonon crystal unit mechanical structure, the characteristic for adjusting phonon crystal realizes that adjustable wideband elastic wave inhibits in the frequency range except band gap.
Description
Technical field
The invention belongs to phonon crystal technical fields, more particularly to a kind of adjustable pressure for inhibiting wideband elastic wave propagation
Electric phonon crystal.
Background technique
Phonon crystal based on Bragg diffraction is the periodic structure with decaying elastic characteristic, under traditional sense, in sound
Without corresponding wave number solution in the corresponding forbidden band frequency range of sub- crystal, the propagation of elastic wave is suppressed in other words,
The energy of Elastic Wave receives the decaying of the diversified forms such as refraction, reflection or absorption.And except forbidden band frequency range, phonon
The elastic wave inhibitory effect of crystal is extremely limited.The wider vibrating elastic wave of frequency range is commonly encountered in engineer application, it is different
Engineer application object has the vibrating elastic wave of different frequency, how to be directed to different engineer applications, adjustably inhibits wide frequency domain
Elastic wave in range is the major issue in engineer application.
In general, inhibiting using the phonon crystal based on Bragg diffraction to elastic wave, phonon crystal is generally required
Size is suitable with the size of elastic wave, if elastic wave frequency rate is lower, wavelength is larger, then needs to refer to that huge phonon crystal comes
Inhibit elastic wave propagation therein, wherein the band gap of traditional phonon crystal depends on the design and size of its crystal unit, does not have
There is adjustability.The inhibition of elastic wave how is thus carried out within the scope of wider frequency domain, and realizes that elastic wave inhibits the adjustable of system
Property, becomes that those skilled in the art are highly desirable always to be solved the problems, such as.
Summary of the invention
To solve the above problems, the present invention proposes a kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation,
It works well within the scope of wide frequency domain to attenuation of elastic wave, solve that adjustable wideband elastic wave in low-frequency range inhibits asks
Topic.
Technical solution: the present invention proposes a kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation, including more
The elastic wave channel of a parallel arrangement；Each elastic wave channel includes several piezoelectricity sound according to one dimensional lattice periodic arrangement
Sub- crystal unit；Each piezoelectric photonic crystal unit includes substrate, the PZT (piezoelectric transducer) being fixed on substrate and is connected to
Shunt circuit on PZT (piezoelectric transducer)；The bullet for injecting the elastic wave channel is modulated by shunt circuit in each elastic wave channel
Property wave phase so that the elastic wave that multiple elastic wave channels are projected generate phase difference and from cancellation.
Further, the shunt circuit includes capacitor, first resistor, second resistance and operational amplifier；The capacitor connects
It connects between the output end and electrode input end of operational amplifier, first resistor is connected to the output end and cathode of operational amplifier
Between input terminal, second resistance is connected between the negative input of operational amplifier and ground line；The PZT (piezoelectric transducer)
The electrode input end of end surface connection operational amplifier；Another end surfaces connection ground line.
Further, the equivalent negative capacitance of the shunt circuit is suitable with the capacitance of PZT (piezoelectric transducer).
Further, the chip model of the operational amplifier is TL082.
Further, the upper surface and/or lower surface of the substrate are connected with PZT (piezoelectric transducer).
Further, the PZT (piezoelectric transducer) is round or oval or the sheet of rectangle or diamond shape or triangle or hexagon
Structure；The shape of substrate is in rectangle or square or hexagon in the piezoelectric photonic crystal unit.
Further, the center of the PZT (piezoelectric transducer) and the center of substrate are Chong Die.
It further, further include elastic wave incidence channel and elastic wave exit channel.
Further, the overall width in multiple elastic wave channels and elastic wave incidence channel is of same size, and elastic wave is incident
Channel is of same size with elastic wave exit channel.
Further, the elastic wave incidence channel and elastic wave exit channel are provided with Bolted Joints, glue sticking
Mouth or welding junction.
The utility model has the advantages that the present invention adjusts the piezoelectricity phonon in each elastic wave channel by constructing multiple elastic wave channels
The electrical parameter of the shunt circuit of crystal unit adjusts the dispersion characteristics of piezoelectric photonic crystal, so that the elastic wave channel
The change that the phase of elastic wave is realized using the dispersion characteristics of piezoelectric photonic crystal, realizes the phase of elastic wave in different channels
Difference, the artificial phase difference induction elastic wave using elastic wave solve the problems, such as that elastic wave inhibits in wide frequency range from cancellation.This hair
Principle used by bright is different from the principle of wave reflection, absorption in traditional phonon crystal band gap, the interference phase that the present invention utilizes
The principle to disappear can adjust the characteristic of phonon crystal, except band gap under the premise of not changing phonon crystal unit mechanical structure
Frequency range in realize that adjustable wideband elastic wave inhibits.The present invention is in low frequency ultra-wide frequency domain, attenuation of elastic wave effect
Fruit is good, and has good adjustability.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the mono-crystalline structures schematic diagram of phonon crystal unit of the invention；
Fig. 3 is the twin crystal structure schematic diagram of phonon crystal unit of the invention；
Fig. 4 is shunt circuit connection schematic diagram of the invention；
Fig. 5 is the schematic diagram to the regulation of elastic wave phase of the phonon crystal of single elastic wave propagation channel period arrangement；
Fig. 6 is the corresponding elastic wave transport frequency response chart of piezoelectric photonic crystal in double elastic wave channels.
Specific embodiment
One embodiment of the present of invention is as shown in Figure 1, include the elastic wave channel of two parallel arrangements；Each elasticity
Wave channel includes five piezoelectric photonic crystal units 1 according to one dimensional lattice periodic arrangement.
Each piezoelectric photonic crystal unit 1 includes substrate 2, affixed PZT (piezoelectric transducer) 3 on a substrate 2 and passes through ring
Oxygen resin is adhesive in the shunt circuit 4 on PZT (piezoelectric transducer) 3.Such as Fig. 2, can piezoelectricity only be arranged in a side surface in every piece of substrate 2
Energy converter 3；Such as Fig. 3, every piece of substrate 2 can also be respectively provided with PZT (piezoelectric transducer) 3 in upper and lower surfaces.
Such as Fig. 4, the shunt circuit 4 includes capacitor 401, first resistor 402, second resistance 403 and operational amplifier
404；The capacitor 401 is connected between the output end and electrode input end of operational amplifier 404, and first resistor 402 is connected to
Between the output end and negative input of operational amplifier 404, the cathode that second resistance 403 is connected to operational amplifier 404 is defeated
Enter between end and ground line；The electrode input end of the end surface connection operational amplifier 404 of the PZT (piezoelectric transducer) 3；It is another
End surfaces connection ground line.Wherein the chip model of the operational amplifier 404 is preferably TL082.
Shunt circuit 4 causes to press by the feedback function of operational amplifier 404 to the reversed input charge of PZT (piezoelectric transducer) 3
The equivalent Young's modulus of electric transducer 3 generates variation, so as to cause piezoelectric photonic crystal if only dispersion characteristics generate variation, most
The phase of the elastic wave wherein passed to is made to generate variation eventually.Charge of the shunt circuit 4 to the reversed input charge of PZT (piezoelectric transducer) 3
Amount is related to the equivalent capacitance value of shunt circuit 4.
The capacitance of capacitor 401 is C in shunt circuit 41, the resistance value of first resistor 402 is R1, the electricity of second resistance 403
Resistance value is R2, then the equivalent capacitance value of shunt circuit 4 beBy adjusting R1And R2Ratio, thus it is possible to vary point
The equivalent capacitance value C of current circuit 4n, to adjust the phase changing capacity of elastic wave.
When the elastic wave phase difference in two elastic wave channels is π, two column elastic waves realize that phase is mutually completely
Disappear；When the elastic wave phase in two elastic wave channels differs less than π, the two mutual cancellations of column elastic wave achievement unit split-phase,
Two elastic wave channels make elastic waveform stereoscopic at mutual phase difference and from cancellation, realize the bullet of ultra-wide frequency domain in low-frequency range
Property wave attenuation, solve the problems, such as in low-frequency range that wideband elastic wave inhibits, and the on-line control of shunt circuit 4, may be implemented
The change of two elastic wave channel wave propagation characteristics, to realize the adjusting of attenuation of elastic wave characteristic.
When suitable with the capacitance of PZT (piezoelectric transducer) 3 due to the equivalent capacitance value of shunt circuit 4, shunt circuit 4 is to piezoelectricity
The regulating effect of acoustic metamaterial is the most obvious, it is preferable that the equivalent capacitance value of shunt circuit 4 and the capacitor of PZT (piezoelectric transducer) 3
Value is suitable.
The PZT (piezoelectric transducer) 3 is round or oval or the laminated structure of rectangle or diamond shape or triangle or hexagon；
The shape of substrate 2 is in rectangle or square or hexagon in the piezoelectric photonic crystal unit 1.
The center of the PZT (piezoelectric transducer) 3 is Chong Die with the center of substrate 2.
The invention also includes elastic wave incidence channels 5 and elastic wave exit channel 6.The overall width in multiple elastic wave channels with
Elastic wave incidence channel 5 it is of same size, and elastic wave incidence channel 5 and elastic wave exit channel 6 is of same size.The bullet
Property wave incidence channel 5 and elastic wave exit channel 6 are provided with Bolted Joints, gluing interface or welding junction 7.
Fig. 5 is the schematic diagram to the regulation of elastic wave phase of the phonon crystal of single elastic wave channel period arrangement, wherein
The lattice constant a of piezoelectric photonic crystal unit 1 be 0.25m, substrate 2 be made of metal rectangle, substrate 2 with a thickness of 0.01a~
0.3a, affixed rectangular PZT (piezoelectric transducer) 3 on substrate 2 connect shunt circuit 4 on PZT (piezoelectric transducer) 3, and corresponding elastic wave channel can
To achieve over the phase-modulation of 2 π.
Fig. 6 is the corresponding elastic wave transport frequency response chart of phonon crystal in double elastic wave channels of the present embodiment.Two
When elastic wave phase difference in a elastic wave channel is π, the attenuating of elastic wave vibration is obvious and forms multiple biographies
Pass rate valley.In other frequency ranges, the elastic wave phase in two elastic wave channels differs less than π, also exists significant
The effect of elastic wave energy decaying, it is wide in frequency that the effect of elastic wave energy decaying is compared to traditional local resonance Meta Materials
There is tremendous promotion on degree and damping capacity two indices.More elastic wave channel phonon crystal designs realize in low-frequency range
The energy attenuation effect of ultra-wideband bending vibration, and the effective frequency range for inhibiting elastic wave vibration has been significantly greatly increased.
Claims (10)
1. a kind of adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation, it is characterised in that: including multiple parallel arrangements
Elastic wave channel；Each elastic wave channel includes several piezoelectric photonic crystal lists according to one dimensional lattice periodic arrangement
Member；Each piezoelectric photonic crystal unit includes substrate, the PZT (piezoelectric transducer) being fixed on substrate and is connected to piezoelectric energy-conversion
Shunt circuit on device；The elastic wave phase for injecting the elastic wave channel is modulated by shunt circuit in each elastic wave channel
Position so that the elastic wave that multiple elastic wave channels are projected generate phase difference and from cancellation.
2. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 1, it is characterised in that: institute
Stating shunt circuit includes capacitor, first resistor, second resistance and operational amplifier；The capacitance connection is in the defeated of operational amplifier
Between outlet and electrode input end, first resistor is connected between the output end of operational amplifier and negative input, the second electricity
Resistance is connected between the negative input of operational amplifier and ground line；The end surface connection operation of the PZT (piezoelectric transducer) is put
The electrode input end of big device；Another end surfaces connection ground line.
3. the piezoelectric photonic crystal of adjustable inhibition wideband elastic wave propagation according to claim 2 any one, special
Sign is: the equivalent negative capacitance of the shunt circuit is suitable with the capacitance of PZT (piezoelectric transducer).
4. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 3, it is characterised in that: institute
The chip model for stating operational amplifier is TL082.
5. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to any one of claims 1-4,
Be characterized in that: the upper surface and/or lower surface of the substrate are connected with PZT (piezoelectric transducer).
6. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 5, it is characterised in that: institute
PZT (piezoelectric transducer) is stated to be round or oval or the laminated structure of rectangle or diamond shape or triangle or hexagon；The piezoelectricity phonon
The shape of substrate is in rectangle or square or hexagon in crystal unit.
7. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 6, it is characterised in that: institute
The center for stating PZT (piezoelectric transducer) is Chong Die with the center of substrate.
8. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 1, it is characterised in that: also
Including elastic wave incidence channel and elastic wave exit channel.
9. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 8, it is characterised in that: more
The overall width in a elastic wave channel is of same size with elastic wave incidence channel, and elastic wave incidence channel and elastic wave outgoing are logical
Road it is of same size.
10. the adjustable piezoelectric photonic crystal for inhibiting wideband elastic wave propagation according to claim 9, it is characterised in that:
The elastic wave incidence channel and elastic wave exit channel are provided with Bolted Joints, gluing interface or welding junction.
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| CN201910567536.4A CN110390926B (en) | 2019-06-27 | 2019-06-27 | Adjustable piezoelectric phononic crystal for inhibiting broadband elastic wave propagation |
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Cited By (5)
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| CN111119402A (en) * | 2019-12-30 | 2020-05-08 | 哈尔滨工程大学 | Periodic piezoelectric beam structure with active vibration and noise reduction function |
| CN111541045A (en) * | 2020-05-21 | 2020-08-14 | 天津大学 | Mechanical metamaterial fluctuation device with active regulation and control function |
| CN113531022A (en) * | 2021-07-26 | 2021-10-22 | 天津大学 | Active control local resonance metamaterial device for low-frequency vibration isolation |
| CN115132160A (en) * | 2022-08-30 | 2022-09-30 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Broadband low-frequency sound insulation device based on piezoelectric hybrid shunt circuit and design method thereof |
| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
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| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
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