CN112965050B - Method for realizing medium-high frequency broadband multi-directivity emission matrix - Google Patents
Method for realizing medium-high frequency broadband multi-directivity emission matrix Download PDFInfo
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- CN112965050B CN112965050B CN202110146617.4A CN202110146617A CN112965050B CN 112965050 B CN112965050 B CN 112965050B CN 202110146617 A CN202110146617 A CN 202110146617A CN 112965050 B CN112965050 B CN 112965050B
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- transducer
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- subarrays
- piezoelectric ceramic
- ceramic particles
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- 239000011159 matrix material Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 60
- 239000002245 particle Substances 0.000 claims abstract description 52
- 239000002356 single layer Substances 0.000 claims abstract description 36
- 239000000919 ceramic Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229920003225 polyurethane elastomer Polymers 0.000 claims abstract description 6
- 239000007799 cork Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52079—Constructional features
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a method for realizing a medium-high frequency broadband multi-directivity emission matrix, which comprises the following steps: selecting a particle type matching layer transducer as a transmitting transducer array element, and selecting the height of the piezoelectric ceramic particles according to the working center frequency of the equipment and the longitudinal sound velocity of the piezoelectric ceramic particles; determining the length, width and number of the piezoelectric ceramic particles; all the positive poles and the negative poles of the piezoelectric ceramic particles of the particle type matching layer transducer are respectively connected in parallel; manufacturing 4 particle type matching layer transducers formed according to the steps 1-3 and forming a single-layer transducer subarray; manufacturing 4 single-layer transducer subarrays obtained according to the step 4 and forming transducer subarrays positioned on the same axis, wherein the rotation angle of the single-layer transducer subarrays between adjacent transducer subarrays is 22.5 degrees; and finally, pouring a layer of polyurethane rubber on the outer side and the upper side of the transducer subarray for watertight, thus obtaining the medium-high frequency broadband multi-directivity emission matrix.
Description
Technical Field
The invention belongs to the technical field of transducer matrixes, and particularly relates to a multi-directional transmitting matrix of a medium-high frequency broadband, which is formed by utilizing a plurality of medium-high frequency broadband transducers, so as to realize the function of multi-directional sound wave transmission.
Technical Field
Waves are the only energy form that can be propagated in water over long distances, and the use of acoustic waves as an information carrier is currently the best way to achieve underwater communication. The sonar transducer is widely applied to ocean exploration and underwater communication as a device for transmitting and receiving sound waves, and has become main equipment for acquiring underwater information transmission.
The transducer array is an array formed by combining a plurality of transducers according to a certain geometric orientation, and single transducers forming the transducer array are called array elements. The transducer array forms different space directivities to cover any space azimuth by adjusting and controlling the combination of different array elements, so as to realize the communication positioning of any target.
The transmitting transducer used in traditional underwater acoustic communication generally adopts the mode of transmitting sound waves in a semi-infinite space for communication, and the disadvantage of the communication mode is that because the sound signals transmitted by the transducer do not have space directivity, when the number of communication targets is large, mutual interference is easily caused, and the communication efficiency among the targets is affected.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a method for realizing a medium-high frequency broadband multi-directivity emission matrix, which not only can realize 360-degree omni-directivity emission on a horizontal plane, but also can realize sound wave multi-directivity emission according to the needs, thereby effectively improving multi-target communication efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for realizing a medium-high frequency broadband multi-directivity emission matrix comprises the following steps:
step 1: selecting a particle type matching layer transducer as a transmitting transducer array element, and selecting the height of the piezoelectric ceramic particles according to the working center frequency of the equipment and the longitudinal sound velocity of the piezoelectric ceramic particles;
step 2: determining the length, width and number of the piezoelectric ceramic particles;
step 3: all the positive poles and the negative poles of the piezoelectric ceramic particles of the particle type matching layer transducer are respectively connected in parallel;
step 4: manufacturing 4 particle type matching layer transducers formed according to the steps 1-3 and forming a single-layer transducer subarray;
step 5: manufacturing 4 single-layer transducer subarrays obtained according to the step 4 and forming transducer subarrays positioned on the same axis, wherein the rotation angle of the single-layer transducer subarrays between adjacent transducer subarrays is 22.5 degrees;
step 6: and finally, pouring a layer of polyurethane rubber on the outer side and the upper side of the transducer subarray for watertight, thus obtaining the medium-high frequency broadband multi-directivity emission matrix.
The height of the piezoelectric ceramic particles in the step 2 is more than 2 times of the maximum dimension of the length and width of the piezoelectric ceramic particles.
The duty ratio of the ceramic particles is about 50% when the working bandwidth of the particle matching layer transducer reaches one octave.
It should be further noted that, the step 4 further includes: processing a plurality of square round hole positioning pieces and; the piezoelectric ceramic end face of each particle type matching layer transducer faces inwards and the radiation end face faces outwards, and the triangular positioning pieces are sequentially fixed on different side faces of the square round hole positioning pieces from top to bottom; and then the triangular positioning pieces are assembled at the left side and the right side of the particle type matching layer transducer to perform positioning, so that a single-layer transducer subarray capable of respectively transmitting sound waves in 4 different directions on a horizontal plane is completed.
It should be further noted that, the step 5 further includes: sequentially arranging 4 array elements into 4 layers from top to bottom; and taking the top array element as a reference, sequentially rotating the single-layer transducer subarrays of the lower layer relative to the single-layer transducer subarrays of the upper layer by 22.5 degrees in the anticlockwise direction, and thus completing the transducer subarrays with the rotation angle of 22.5 degrees among the single-layer transducer subarrays of each layer.
As a preferable technical scheme, each layer of single-layer transducer subarrays are connected through square round hole positioning pieces.
As a preferable technical scheme, decoupling cork pads are arranged between each layer of single-layer transducer subarrays.
It should be noted that, the horizontal beam opening angle of each particle matching layer transducer in the step 5 is 22.5 °.
The invention has the beneficial effects that:
1. through the combination of all 16 transducers pointing to different directions, 360-degree omni-directional emission of medium-high frequency level can be realized, and connectivity among targets is ensured.
2. Through the combination of a plurality of transducers pointing to different directions, the multi-directional emission of the medium-high frequency level can be conveniently realized, and the communication efficiency among multiple targets is effectively improved.
Drawings
FIG. 1 is a schematic diagram of an array element, i.e., a particle-type matching layer transducer, of a method for implementing a mid-high frequency wideband multi-directional transmitting array according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a single layer transducer sub-array structure made based on the particle-type matching layer transducer composition of FIG. 1;
FIG. 3 is a schematic diagram of a multi-directional transmitting array structure of a mid-high frequency broadband based on the single-layer transducer subarray of FIG. 2;
fig. 4 is a schematic diagram of the mid-high frequency broadband multi-directional transmitting matrix based on fig. 3 after encapsulation.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present invention will be further described with reference to the accompanying drawings, and it should be noted that, while the present embodiment provides a detailed implementation and a specific operation process on the premise of the present technical solution, the protection scope of the present invention is not limited to the present embodiment.
The invention relates to a method for realizing a medium-high frequency broadband multi-directivity emission matrix, which comprises the following steps:
step 1: selecting a particle type matching layer transducer as a transmitting transducer array element, and selecting the height of the piezoelectric ceramic particles according to the working center frequency of the equipment and the longitudinal sound velocity of the piezoelectric ceramic particles;
step 2: determining the length, width and number of the piezoelectric ceramic particles;
step 3: all the positive poles and the negative poles of the piezoelectric ceramic particles of the particle type matching layer transducer are respectively connected in parallel;
step 4: manufacturing 4 particle type matching layer transducers formed according to the steps 1-3 and forming a single-layer transducer subarray;
step 5: manufacturing 4 single-layer transducer subarrays obtained according to the step 4 and forming transducer subarrays positioned on the same axis, wherein the rotation angle of the single-layer transducer subarrays between adjacent transducer subarrays is 22.5 degrees;
step 6: and finally, pouring a layer of polyurethane rubber on the outer side and the upper side of the transducer subarray for watertight, thus obtaining the medium-high frequency broadband multi-directivity emission matrix.
Further, the height of the piezoelectric ceramic particles in the invention is more than 2 times of the maximum dimension of the length and width of the piezoelectric ceramic particles.
Furthermore, when the working bandwidth of the particle type matching layer transducer reaches one octave, the duty ratio of the ceramic particles is about 50%.
It should be further noted that, in step 4 of the present invention, the method further includes: processing a plurality of square round hole positioning pieces and; the piezoelectric ceramic end face of each particle type matching layer transducer faces inwards and the radiation end face faces outwards, and the triangular positioning pieces are sequentially fixed on different side faces of the square round hole positioning pieces from top to bottom; and then the triangular positioning pieces are assembled at the left side and the right side of the particle type matching layer transducer to perform positioning, so that a single-layer transducer subarray capable of respectively transmitting sound waves in 4 different directions on a horizontal plane is completed.
It should be further noted that, in step 5 of the present invention, the method further includes: sequentially arranging 4 array elements into 4 layers from top to bottom; and taking the top array element as a reference, sequentially rotating the single-layer transducer subarrays of the lower layer relative to the single-layer transducer subarrays of the upper layer by 22.5 degrees in the anticlockwise direction, and thus completing the transducer subarrays with the rotation angle of 22.5 degrees among the single-layer transducer subarrays of each layer.
As a preferable technical scheme, each layer of single-layer transducer subarrays are connected through square round hole positioning pieces.
As a preferable technical scheme, decoupling cork pads are arranged between each layer of single-layer transducer subarrays.
It should be noted that, in the present embodiment, the horizontal beam opening angle of each particle matching layer transducer in step 5 is 22.5 °.
Examples
As shown in FIG. 1, the single particle type matching layer transducer in this embodiment employs 28 piezoelectric ceramic particles 1 of lead zirconate titanate (PZT-4), each piezoelectric ceramic particle 1 having a length-width-height dimension of 4.5mm×4.5mm×27mm. The matching layer 2 is made of epoxy resin material, the length, width and height dimensions of the matching layer 2 are 46.5mm multiplied by 24mm multiplied by 7.4mm, and the watertight layer is made of polyurethane rubber.
As shown in fig. 2, the single-layer transducer subarray of the present embodiment employs a total of 4 particle-type matching layer transducers 3. The triangular locating pieces 4 around and the square round hole locating pieces 5 in the center can be made of rigid foam, the length, width and height dimensions of the outer sides of the square round hole locating pieces 5 are 46.5mm multiplied by 24mm, the radius of the inner round hole is 15mm, and the height of the triangular locating pieces 4 is 24mm.
As shown in fig. 3, in this embodiment, 4 layers of single-layer transducer subarrays 6 are adopted, each layer of 4 particle-type matching layer transducers are adopted, a transducer matrix is formed by a total of 16 particle-type matching layer transducers, a decoupling cork pad 7 is inserted between the layers for vibration isolation, a hard aluminum material is adopted as a base 8, and the diameter is 130mm.
As shown in fig. 4, the encapsulating layer is made of polyurethane rubber, the height of the matrix is about 100mm after the encapsulation is finished, and the transducer subarray 9 is obtained after the encapsulation is finished.
Various corresponding changes can be made by those skilled in the art from the above technical solutions and concepts, and all such changes should be included within the scope of the invention as defined in the claims.
Claims (6)
1. The method for realizing the medium-high frequency broadband multi-directivity emission matrix is characterized by comprising the following steps of:
step 1: selecting a particle type matching layer transducer as a transmitting transducer array element, and selecting the height of the piezoelectric ceramic particles according to the working center frequency of the equipment and the longitudinal sound velocity of the piezoelectric ceramic particles;
step 2: determining the length, width and number of the piezoelectric ceramic particles;
step 3: all the positive poles and the negative poles of the piezoelectric ceramic particles of the particle type matching layer transducer are respectively connected in parallel;
step 4: manufacturing 4 particle type matching layer transducers formed according to the steps 1-3 and forming a single-layer transducer subarray;
the step 4 further includes: processing a plurality of square round hole locating pieces and a plurality of triangular locating pieces, and fixing the piezoelectric ceramic end face of each particle type matching layer transducer inwards and the radiation end face outwards on different side faces of the square round hole locating pieces sequentially from top to bottom; then, triangular positioning pieces are assembled at the left side and the right side of the particle type matching layer transducer to perform positioning, namely a single-layer transducer subarray which can respectively emit sound waves in 4 different directions on a horizontal plane is completed;
step 5: manufacturing 4 single-layer transducer subarrays obtained according to the step 4 and forming transducer subarrays positioned on the same axis, wherein the rotation angle of the single-layer transducer subarrays between adjacent transducer subarrays is 22.5 degrees;
the step 5 further includes: sequentially arranging 4 single-layer transducer subarrays into 4 layers from top to bottom; the single-layer transducer subarrays on the lower layer are rotated by 22.5 degrees in a counter-clockwise direction relative to the single-layer transducer subarrays on the upper layer in sequence by taking the single-layer transducer subarrays on the top layer as a reference, so that a transducer subarray with a rotation angle of 22.5 degrees among the single-layer transducer subarrays on each layer is completed;
step 6: and finally, pouring a layer of polyurethane rubber on the outer side and the upper side of the transducer subarray for watertight, thus obtaining the medium-high frequency broadband multi-directivity emission matrix.
2. The method for realizing the medium-high frequency broadband multi-directional transmitting matrix according to claim 1, wherein the height of the piezoelectric ceramic particles in the step 2 is more than 2 times of the maximum dimension of the length and width of the piezoelectric ceramic particles.
3. The method for realizing the medium-high frequency broadband multi-directivity emission matrix according to claim 1, wherein the duty ratio of the ceramic particles is about 50% when the working bandwidth of the particle matching layer transducer reaches one octave.
4. The method for realizing the medium-high frequency broadband multi-directivity emission matrix according to claim 1, wherein each layer of single-layer transducer subarrays are connected through square round hole positioning pieces.
5. The method for realizing the medium-high frequency broadband multi-directivity emission matrix according to claim 1, wherein decoupling cork pads are arranged between each two layers of single-layer transducer subarrays.
6. The method according to claim 1, wherein the horizontal beam opening angle of each particle matching layer transducer in the step 5 is 22.5 °.
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| CN202110146617.4A CN112965050B (en) | 2021-02-03 | 2021-02-03 | Method for realizing medium-high frequency broadband multi-directivity emission matrix |
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| CN202110146617.4A CN112965050B (en) | 2021-02-03 | 2021-02-03 | Method for realizing medium-high frequency broadband multi-directivity emission matrix |
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| CN112965050B true CN112965050B (en) | 2023-12-12 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4878207A (en) * | 1986-11-07 | 1989-10-31 | Plessey Australia Pty. Ltd. | Composite sonar transducer for operation as a low frequency underwater acoustic source |
| CN1892248A (en) * | 2005-07-01 | 2007-01-10 | 中国科学院声学研究所 | Small static-pressure-resisting hydrophone for drag-wire array |
| CN101604020A (en) * | 2009-07-13 | 2009-12-16 | 中国船舶重工集团公司第七一五研究所 | A kind of implementation method of high-frequency wideband omnidirectional cylindrical array |
| CN104597438A (en) * | 2014-12-24 | 2015-05-06 | 中国船舶重工集团公司第七一五研究所 | High-frequency broadband high-power emitting cylindrical array implementation method |
| CN104766600A (en) * | 2015-03-12 | 2015-07-08 | 北京信息科技大学 | Laminated composite material cylindrical array transducer with matching layer and preparation method thereof |
| CN105411623A (en) * | 2015-12-25 | 2016-03-23 | 中国科学院深圳先进技术研究院 | Two-dimensional area array ultrasonic transducer and manufacturing method thereof |
| CN105596027A (en) * | 2014-11-05 | 2016-05-25 | 香港理工大学深圳研究院 | Two-dimensional array ultrasonic transducer based on three-dimensional ultrasonic imaging and preparation method for same |
| CN105611456A (en) * | 2016-01-15 | 2016-05-25 | 中国电子科技集团公司第三研究所 | Self-compensation structure for realizing circumferential non-directivity of acoustic transducer array |
| CN107995557A (en) * | 2017-10-11 | 2018-05-04 | 中国船舶重工集团公司第七〇五研究所 | Sensing and the integrated hydrophone of noise elimination and its implementation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8063540B2 (en) * | 2004-03-08 | 2011-11-22 | Emantec As | High frequency ultrasound transducers based on ceramic films |
| US20060100522A1 (en) * | 2004-11-08 | 2006-05-11 | Scimed Life Systems, Inc. | Piezocomposite transducers |
-
2021
- 2021-02-03 CN CN202110146617.4A patent/CN112965050B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4878207A (en) * | 1986-11-07 | 1989-10-31 | Plessey Australia Pty. Ltd. | Composite sonar transducer for operation as a low frequency underwater acoustic source |
| CN1892248A (en) * | 2005-07-01 | 2007-01-10 | 中国科学院声学研究所 | Small static-pressure-resisting hydrophone for drag-wire array |
| CN101604020A (en) * | 2009-07-13 | 2009-12-16 | 中国船舶重工集团公司第七一五研究所 | A kind of implementation method of high-frequency wideband omnidirectional cylindrical array |
| CN105596027A (en) * | 2014-11-05 | 2016-05-25 | 香港理工大学深圳研究院 | Two-dimensional array ultrasonic transducer based on three-dimensional ultrasonic imaging and preparation method for same |
| CN104597438A (en) * | 2014-12-24 | 2015-05-06 | 中国船舶重工集团公司第七一五研究所 | High-frequency broadband high-power emitting cylindrical array implementation method |
| CN104766600A (en) * | 2015-03-12 | 2015-07-08 | 北京信息科技大学 | Laminated composite material cylindrical array transducer with matching layer and preparation method thereof |
| CN105411623A (en) * | 2015-12-25 | 2016-03-23 | 中国科学院深圳先进技术研究院 | Two-dimensional area array ultrasonic transducer and manufacturing method thereof |
| CN105611456A (en) * | 2016-01-15 | 2016-05-25 | 中国电子科技集团公司第三研究所 | Self-compensation structure for realizing circumferential non-directivity of acoustic transducer array |
| CN107995557A (en) * | 2017-10-11 | 2018-05-04 | 中国船舶重工集团公司第七〇五研究所 | Sensing and the integrated hydrophone of noise elimination and its implementation |
Non-Patent Citations (2)
| Title |
|---|
| 堆叠压电复合材料圆环换能器研究;王宏伟等;《哈尔滨工程大学学报》;第38卷(第3期);第484-488页 * |
| 水声发射换能器技术研究综述;周利生等;《哈尔滨工程大学学报》;第31卷(第7期);第932-937页 * |
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