CN114160397A - Underwater array type high-power ultrasonic wireless energy transfer system - Google Patents
Underwater array type high-power ultrasonic wireless energy transfer system Download PDFInfo
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- CN114160397A CN114160397A CN202111481806.3A CN202111481806A CN114160397A CN 114160397 A CN114160397 A CN 114160397A CN 202111481806 A CN202111481806 A CN 202111481806A CN 114160397 A CN114160397 A CN 114160397A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 1
- 238000002834 transmittance Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
- B06B1/0633—Cylindrical array
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/70—Specific application
- B06B2201/74—Underwater
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses an underwater array type high-power ultrasonic wireless energy transfer system which comprises a high-frequency input power supply, a transmitting transducer array and a receiving transducer, wherein the transmitting transducer array consists of a plurality of transducers which form an included angle theta, and each transducer of a transmitting end and a receiving end consists of piezoelectric ceramics, a matching layer, a back lining and a shell. The core of the invention lies in that through the array structure of the transmitting transducer array, the energy density of the transmitting end is dispersed, the sound wave attenuation caused by cavitation effect is reduced, and meanwhile, the receiving transducer is positioned at the energy focus, and the transmission power of the underwater ultrasonic wireless energy transmission system is increased. After the power supply is switched on, the inverter outputs high-frequency alternating current with the same frequency as the resonant frequency of the transducer, each transducer at the transmitting end is driven by the resonant compensation circuit, ultrasonic waves emitted by the transducers are converged at the focus to be received by the receiving transducer, electric energy is output, the transmission power of underwater ultrasonic wireless energy transmission can be improved, and hundred watt-level energy transmission is achieved.
Description
Technical Field
The invention relates to the technical field of underwater ultrasonic wireless energy transmission, in particular to an underwater array type high-power ultrasonic wireless energy transmission system, which adopts a transducer array form to increase the transmission power of the system.
Background
The wireless energy transmission technology is to convert electric energy into energy in other forms, transmit the energy to a receiving end through a certain transmission medium, and then convert the energy into electric energy to supply energy to specified equipment. At present, the wireless energy transmission technology utilizing ultrasonic waves is still in a research stage, the wireless energy transmission technology utilizing the ultrasonic waves is utilized to supply energy to underwater equipment, the working efficiency and the service life of the underwater equipment can be improved, and the advantages of strong directivity and concentrated energy of the ultrasonic waves can be utilized to obtain higher transmission efficiency and power in medium-long distance energy transmission.
The core of the ultrasonic wireless energy transmission technology is an ultrasonic transducer, and a piezoelectric ultrasonic transducer (hereinafter referred to as an energy transducer) is used for converting electric energy and mechanical energy (ultrasonic) by using the positive and negative piezoelectric effect of piezoelectric ceramics so as to realize wireless energy transmission. Suitable matching layers and backings are required in the transducer in addition to the piezoelectric ceramic to increase the transmission of sound waves into the water and increase transmission efficiency.
At present, the transmission power of an underwater ultrasonic wireless energy transmission system is generally not high, and the energy transmission power of the system is mainly limited by the liquid cavitation effect except the size, the structure, the strength of piezoelectric ceramics and the like of an energy converter. The cavitation effect means that when the transducer vibrates to push the liquid medium to radiate sound waves, a large local negative pressure is generated in the liquid contraction strain process, and when the pressure is reduced to a critical value, the liquid generates cavitation phenomena to generate bubbles or cavities, so that the serious scattering loss of the sound waves is caused, and the attenuation of the sound waves in water is increased rapidly.
In order to solve the problems, a transducer array for underwater ultrasonic wireless energy transmission is designed, the energy density emitted by a single transducer is dispersed, and ultrasonic waves are received at the focus of the array.
Disclosure of Invention
The invention provides an underwater array type high-power ultrasonic wireless energy transfer system, which is used for solving the problem that the transmission power of the system is limited by a liquid cavitation effect in the existing underwater ultrasonic wireless energy transfer system, and the power transmission capability of the underwater ultrasonic wireless energy transfer system is improved by dispersing the energy density emitted by a single transducer in a transducer array mode.
In order to achieve the purpose, the implementation of the invention adopts the following technical scheme:
an underwater array type high-power ultrasonic wireless energy transfer system is composed of an input high-frequency power supply 1-1, a transmitting transducer array 1-2, a liquid transmission medium 1-3, a receiving transducer 1-4 and a receiving load 1-5. The transmitting transducer array is in a six-vibrator form, the six transducers have different gamma included angles, each transducer is arranged on a support rod with a fixed radius, and the included angle theta between the support rod and an xy plane is changed to adjust the corresponding focusing distance. Each transducer is composed of quartz glass 2-1, a copper sheet 2-3, piezoelectric ceramics 2-5 and a transducer shell 2-6. Wherein, the copper sheet 2-3 is pasted on one end face of the piezoelectric ceramic 2-5 by using conductive adhesive 2-4 as an electrode terminal, the quartz glass 2-1 is pasted on the front end of the copper sheet 2-3 by using epoxy resin adhesive 2-2 as a matching layer of the transducer, and finally the parts are packaged in a transducer shell 2-6.
After the power supply is switched on, the input high-frequency power supply 1-1 outputs alternating current with the same resonant frequency as the transducer through the inverter to drive the transmitting transducer array 1-2, and the transducer converts the electric energy into ultrasonic waves with the same frequency by utilizing the inverse piezoelectric effect of the piezoelectric ceramics 2-5 and radiates the ultrasonic waves into the liquid transmission medium 1-3. The sound wave emitted by the single transducer generates sound pressure with amplitude value of any point R (x, y, z) in the liquid transmission medium 1-3
Wherein, PiThe sound pressure amplitude of any point, omega the angular frequency of sound wave, rho0Is the density, u, of the liquid transfer medium 1-3aIs the particle vibration velocity, a is the transducer radius, J1(kassin alpha) is a first-order Bessel function, k is a wave number, alpha is an included angle formed by a connecting line of any point and the center of the transducer and the axis of the transducer, and d is the distance from any point to the center of the transducer; the amplitude of sound pressure on the axis of the transducer is
Wherein, c0Is the sound velocity of the sound wave in the liquid transmission medium 1-3, and r is the distance from the focal point to the center of the transducer; finally, the total sound pressure of any point in the space is the sum of the sound pressures generated by all the transducers at the point
Compared with the prior art, the invention has the following beneficial effects:
(1) the underwater ultrasonic wireless energy transmission technology in the form of a multi-vibration element array is adopted, the energy density emitted by a single transducer is dispersed, and the transmission power of an underwater ultrasonic wireless energy transmission system is effectively improved.
(2) Simple structure, it is convenient to use, can adjust focus angle in a flexible way and change focus position, changes the wireless energy transmission of the ultrasonic wave under water of realizing more remote distance, and the energy is only concentrated on focus department, and the utilization ratio of energy is high.
Drawings
Fig. 1 is a schematic diagram of the system operation.
Fig. 2 is a transducer configuration.
Fig. 3 is a plan view of the transducer array.
Fig. 4a, 4b, 4c, 4d, 4e and 4f are sound field simulation results of underwater transducer arrays focused at 5cm, 10cm, 15cm, 20cm, 30cm and 50cm, respectively.
Wherein the content of the first and second substances,
1-1, inputting a high-frequency power supply; 1-2, a transmit transducer array; 1-3 liquid transfer media; 1-4, a receiving transducer; 1-5, receiving a load.
2-1, quartz glass; 2-2, epoxy resin adhesive; 2-3 copper sheets; 2-4, conductive adhesive; 2-5, piezoelectric ceramics; 2-6, a transducer housing.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in FIG. 1, an input power source 1-1 includes a DC source, an inverter and a resonance compensation circuit, and outputs an AC power of a specific frequency to drive a transmitting transducer array 1-2. When voltage is applied to two ends of the transmitting transducer array 1-2, deformation is generated inside the piezoelectric ceramic due to the inverse piezoelectric effect of the piezoelectric ceramic, and ultrasonic waves with the same frequency as the voltage are radiated in a vibration mode. The sound waves radiated by the six transducer vibration elements are converged at the focal point position of the receiving transducer 1-4 through the liquid transmission medium 1-3, and the receiving transducer 1-4 converts the received ultrasonic waves into electric energy through the piezoelectric effect of the piezoelectric ceramics to supply energy to the receiving load 1-5.
As shown in FIG. 2, the structure of a single transducer is that a piezoelectric ceramic 2-5 is taken as a core, and a copper sheet 2-3 is adhered to one end face of the piezoelectric ceramic 2-5 by a conductive adhesive 2-4 to serve as one electrode terminal thereof. Quartz glass 2-1 is used as a matching layer, and is pasted at the front end of a copper sheet 2-3 by using an epoxy resin adhesive 2-2, and finally the parts are packaged in a transducer shell 2-6. Wherein, the diameter of the quartz glass 2-1 is 50mm, and the thickness is 14 mm; the diameter of the copper sheet 2-3 is 50mm, and the thickness is 0.1 mm; the outer diameter of the piezoelectric ceramics 2-5 is 50mm, the inner diameter is 17mm, and the thickness is 6.5 mm; the transducer housing 2-6 has an outer diameter of 60mm, an inner diameter of 50mm and a height of 40 mm.
As shown in fig. 3, the plane structure of the six-element transducer array is shown, the left figure is a front view of the transducer array, and the right figure is a side view of the transducer array forming a natural focus in a transmission medium. The radius of each transducer is a, the position angle of each transducer is represented by gamma (0: pi/3:5pi/3) by taking the transducer right above as a reference. The included angle between the transducer and the xy plane is theta, a natural focus O is formed on the z axis, a coordinate system is established by taking O as an original point, and the coordinate of the central point A of the transducer is
A(rsinθcosγ,rsinθsinγ,-rcosθ)
Let a point R (x, y, z) be a space, two vectors can be obtained
The included angle alpha and the distance from R to A are
The sound pressure amplitude generated by the single transducer at the R point is
Acoustic pressure on a single transducer axis is calculated using a rigorous solution
Finally, the total sound pressure at the R point is the sum of the sound pressures generated by the transducers at that point
In practice, the focus angle θ is changed while the radius of the transducer array is kept constant, and focusing results at different focusing distances are obtained.
As shown in fig. 4a, 4b, 4c, 4d, 4e and 4f, the sound pressure clouds of the underwater transducer array obtained by calculation are sequentially focused at 5cm, 10cm, 15cm, 20cm, 30cm and 50 cm.
As can be seen from fig. 4a, 4b, 4c, 4d, 4e and 4f, the underwater transducer array disperses the energy density emitted by a single transducer, and the transmission power of the underwater ultrasonic wireless energy transmission system can be effectively increased by placing the receiving transducer at the focal point.
Claims (5)
1. The utility model provides an underwater array type high-power ultrasonic wave wireless energy transfer system which characterized in that: the device comprises an input high-frequency power supply (1-1), a transmitting transducer array (1-2), a liquid transmission medium (1-3), a receiving transducer (1-4) and a receiving load (1-5); the transmitting transducer array (1-2) is connected with an input high-frequency power supply (1-1) and is in a multi-vibration element form, a plurality of transducers have a difference gamma included angle, each transducer is arranged on a support rod with a fixed radius, and the included angle theta between the support rod and an xy plane is changed to adjust a corresponding focusing distance; the receiving transducer (1-4) is arranged on a focus of the transmitting transducer array (1-2), the receiving transducer (1-4) is connected with the receiving load (1-5), and the transmitting transducer array (1-2) and the receiving transducer (1-4) are positioned in the liquid transmission medium (1-3).
2. The underwater array type high-power ultrasonic wireless energy transfer system according to claim 1, characterized in that: after the power supply is switched on, a high-frequency power supply (1-1) is input, alternating current with the same resonance frequency as that of the transducer is output through an inverter to drive a transmitting transducer array (1-2), and the transducer in the transmitting transducer array (1-2) converts electric energy into ultrasonic waves with the same frequency by utilizing the inverse piezoelectric effect of piezoelectric ceramics (2-5) and radiates the ultrasonic waves into a liquid transmission medium (1-3); the sound pressure amplitude generated by the sound wave emitted by the single transducer at any point R (x, y, z) in the liquid transmission medium (1-3) is
Wherein, PiIs the sound pressure of any pointAmplitude, ω being the angular frequency of the sound wave, ρ0Is the density of the liquid transfer medium, uaIs the particle vibration velocity, a is the transducer radius, J1(kassin alpha) is a first-order Bessel function, k is a wave number, alpha is an included angle formed by a connecting line of any point and the center of the transducer and the axis of the transducer, and d is the distance from any point to the center of the transducer; the amplitude of sound pressure on the axis of the transducer is
Wherein, c0Is the sound velocity of the sound wave in the liquid transmission medium, and r is the distance from the focal point to the center of the transducer; finally, the total sound pressure of any point in the space is the sum of the sound pressures generated by all the transducers at the point
3. The underwater array type high-power ultrasonic wireless energy transfer system according to claim 1, wherein each transducer in the transmitting transducer array (1-2) is composed of quartz glass (2-1), copper sheets (2-3), piezoelectric ceramics (2-5) and transducer shells (2-6); the method comprises the following steps that a copper sheet (2-3) is pasted on one end face of piezoelectric ceramic (2-5) through conductive adhesive (2-4) to serve as an electrode terminal, quartz glass (2-1) is pasted on the front end of the copper sheet (2-3) through epoxy resin adhesive (2-2) to serve as a matching layer of a transducer, and finally the copper sheet and the quartz glass are packaged in a transducer shell (2-6), so that the formed specific structure has high sound wave transmittance, and the efficiency of sound wave radiation of each vibration element transducer to a liquid transmission medium (1-3) is improved; the structure of the receiving transducer (1-4) is the same as the structure of each transducer in the transmitting transducer array (1-2).
4. The underwater array type high-power ultrasonic wireless energy transmission system according to claim 1, wherein a six-vibrator array form is adopted, energy density emitted by a single transducer is dispersed, emitted acoustic power is only concentrated at a focus position, acoustic wave attenuation caused by liquid cavitation effect is reduced, and transmission power of the underwater ultrasonic wireless energy transmission system is effectively improved.
5. The underwater array type high-power ultrasonic wireless energy transfer system of claim 1, wherein a focusing distance is changed by adjusting an included angle theta between each vibration element in the transducer array and an xy plane, and a receiving transducer is placed at a set focus, so that the transmission distance and the energy utilization rate of the underwater ultrasonic wireless energy transfer system are effectively improved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111481806.3A CN114160397B (en) | 2021-12-06 | 2021-12-06 | Underwater array type high-power ultrasonic wireless energy transfer system |
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| CN202111481806.3A CN114160397B (en) | 2021-12-06 | 2021-12-06 | Underwater array type high-power ultrasonic wireless energy transfer system |
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| CN114160397A true CN114160397A (en) | 2022-03-11 |
| CN114160397B CN114160397B (en) | 2022-06-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115136950A (en) * | 2022-07-05 | 2022-10-04 | 国网河南省电力公司镇平县供电公司 | Bird repelling method and bird repelling device |
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| US5015929A (en) * | 1987-09-07 | 1991-05-14 | Technomed International, S.A. | Piezoelectric device with reduced negative waves, and use of said device for extracorporeal lithotrity or for destroying particular tissues |
| US20090230823A1 (en) * | 2008-03-13 | 2009-09-17 | Leonid Kushculey | Operation of patterned ultrasonic transducers |
| CN101600130A (en) * | 2009-06-26 | 2009-12-09 | 瑞声声学科技(深圳)有限公司 | Loudspeaker array |
| CN102416225A (en) * | 2010-09-27 | 2012-04-18 | 重庆融海超声医学工程研究中心有限公司 | Ultrasonic transducer |
| CN104122333A (en) * | 2014-04-12 | 2014-10-29 | 北京工业大学 | Array resolution type ultrasonic focusing transducer |
| CN110707791A (en) * | 2019-10-22 | 2020-01-17 | 北京理工大学 | Ultrasonic wave-based remote high-power underwater wireless charging system |
-
2021
- 2021-12-06 CN CN202111481806.3A patent/CN114160397B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4180791A (en) * | 1978-03-09 | 1979-12-25 | General Electric Company | Simplified sector scan ultrasonic imaging system |
| US5015929A (en) * | 1987-09-07 | 1991-05-14 | Technomed International, S.A. | Piezoelectric device with reduced negative waves, and use of said device for extracorporeal lithotrity or for destroying particular tissues |
| US20090230823A1 (en) * | 2008-03-13 | 2009-09-17 | Leonid Kushculey | Operation of patterned ultrasonic transducers |
| CN101600130A (en) * | 2009-06-26 | 2009-12-09 | 瑞声声学科技(深圳)有限公司 | Loudspeaker array |
| CN102416225A (en) * | 2010-09-27 | 2012-04-18 | 重庆融海超声医学工程研究中心有限公司 | Ultrasonic transducer |
| CN104122333A (en) * | 2014-04-12 | 2014-10-29 | 北京工业大学 | Array resolution type ultrasonic focusing transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115136950A (en) * | 2022-07-05 | 2022-10-04 | 国网河南省电力公司镇平县供电公司 | Bird repelling method and bird repelling device |
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