CN116037443A - Low frequency broadband dish-shaped transducer - Google Patents
Low frequency broadband dish-shaped transducer Download PDFInfo
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- CN116037443A CN116037443A CN202310087674.9A CN202310087674A CN116037443A CN 116037443 A CN116037443 A CN 116037443A CN 202310087674 A CN202310087674 A CN 202310087674A CN 116037443 A CN116037443 A CN 116037443A
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- driving unit
- shell
- piezoelectric ceramic
- cable
- frequency broadband
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- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000000919 ceramic Substances 0.000 claims description 29
- 230000007704 transition Effects 0.000 claims description 26
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- 239000010959 steel Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 238000004382 potting Methods 0.000 claims description 4
- 238000013040 rubber vulcanization Methods 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000004044 response Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- 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
Abstract
The invention provides a low-frequency broadband dish-shaped transducer which comprises an upper shell, a lower shell, a driving unit, a prestress assembly and a cable, wherein the outer edge of the upper shell is connected with the outer edge of the lower shell in a sealing manner to form a dish-shaped shell; the driving unit is arranged inside the butterfly-shaped shell, two ends of the driving unit are respectively connected with the middle part of the upper shell and the middle part of the lower shell, the prestress assembly is connected with the driving unit and used for applying longitudinal prestress to the driving unit, one end of the cable is connected with the driving unit, and the other end of the cable is positioned outside the butterfly-shaped shell. The invention has simple structure and convenient operation, adopts a special dish-shaped upper and lower shell structure, realizes the coupling of the longitudinal vibration mode of the driving unit and the bending vibration mode of the shell, greatly improves the working bandwidth of the transducer, and has excellent pressure resistance compared with the prior art, and the invention has the advantages of wide band and pressure resistance.
Description
Technical Field
The invention relates to the technical field of underwater sound engineering, in particular to a low-frequency broadband dish-shaped transducer.
Background
The technology of underwater sound engineering is currently becoming the main information technology in the ocean field and is also the first interest of human beings to explore the ocean. The underwater acoustic transducer as an "electro-acoustic" conversion component is a key component of underwater detection implemented by underwater acoustic engineering equipment. The lower the frequency of the sound wave is, the smaller the propagation loss in water is, and the farther the distance that the sound wave can propagate is, so that the low-frequency transducer has important application in long-distance underwater target detection and underwater sound communication. Common low frequency transducers are mainly curved transducers, curved-open transducers, helmholtz transducers, etc.
Patent document CN105702243B (application No. 201410710883.5) discloses a double-shell series IV-type flextensional transducer, by connecting two flextensional shells in series, the equivalent stiffness of the shells is reduced, while the length of the mountable piezoelectric drive unit is longer. The fundamental transmit voltage response is increased by about 1.7dB compared to about 17% lower resonant frequency for an IV-type flextensional transducer of the same size. Patent document CN104282299B (application number: 201310293921.7) discloses a longitudinal vibration helmholtz deepwater low-frequency broadband transducer, which adopts a longitudinal vibration excitation source to drive a helmholtz resonator and has the characteristics of high power emission, high depth operation and low frequency. The low frequency transducers reported in the above publications do some improvement in the structural form and driving manner with the aim of lowering the resonant frequency or increasing the radiated power, but the improvement of the operating bandwidth of the transducer is not obvious. The bandwidth of the transducer has very important influence on signal transmission, and influences the frequency spectrum of the transmitted sound signal in the frequency domain and the waveform of the signal in the time domain. Accordingly, there is a need for intensive research into the problem of broadband emission of low frequency transducers.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a low frequency broadband disk transducer.
The low-frequency broadband dish-shaped transducer comprises an upper shell, a lower shell, a driving unit, a prestress assembly and a cable, wherein the outer edge of the upper shell is connected with the outer edge of the lower shell in a sealing manner to form a dish-shaped shell;
the driving unit is arranged inside the butterfly-shaped shell, two ends of the driving unit are respectively connected with the middle part of the upper shell and the middle part of the lower shell, the prestress assembly is connected with the driving unit and used for applying longitudinal prestress to the driving unit, one end of the cable is connected with the driving unit, and the other end of the cable is positioned outside the butterfly-shaped shell.
Preferably, the prestress assembly comprises a pair of transition blocks and a prestress screw, wherein the pair of transition blocks are respectively arranged between one end of the driving unit and the upper shell and between the other end of the driving unit and the lower shell;
the driving unit is internally provided with a central hole which is longitudinally communicated, the prestress screw is arranged in the central hole, two ends of the prestress screw are fixedly connected with the paired transition blocks respectively, and longitudinal prestress is applied to two ends of the driving unit through the paired transition blocks respectively by the prestress screw.
Preferably, one end of the transition block is tightly connected with the upper shell or the lower shell, and the other end of the transition block is tightly connected with the driving unit.
Preferably, the outer edge of the upper housing is fastened and connected with the outer edge of the lower housing by a plurality of fastening screws arranged along the circumferential direction.
Preferably, the driving unit comprises a polarized piezoelectric ceramic stack and unpolarized piezoelectric ceramic sheets arranged at two ends of the polarized piezoelectric ceramic stack, wherein the polarized piezoelectric ceramic stack comprises an even number of polarized piezoelectric ceramic sheets which are stacked and bonded along the longitudinal direction;
the polarization directions of the adjacent polarized piezoelectric ceramic plates are opposite, the positive electrode and the negative electrode of each polarized piezoelectric ceramic plate are welded with positive and negative wires through thin electrode plates to form a circuit in parallel connection, and the unpolarized piezoelectric ceramic plates are bonded with the polarized piezoelectric ceramic stack.
Preferably, the upper shell and the lower shell are made of aluminum, steel, carbon fiber or titanium alloy.
Preferably, the material of the transition block is aluminum, steel or titanium alloy;
the prestress screw is made of titanium alloy or steel.
Preferably, a sealing groove is formed in the connecting surface of the lower shell and the upper shell, and a sealing ring is arranged in the sealing groove.
Preferably, a cable head is arranged on the upper shell, and the cable head is used as a cable to extend out of an outlet of the dish-shaped shell;
the cable head and the cable are subjected to watertight treatment.
Preferably, the watertight treatment comprises rubber vulcanization or polyurethane potting.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple structure and convenient operation, adopts a special dish-shaped upper and lower shell structure, realizes the coupling of the longitudinal vibration mode of the driving unit and the bending vibration mode of the shell, greatly improves the working bandwidth of the transducer, and has excellent pressure resistance compared with the prior art, and the invention has the advantages of wide band and pressure resistance.
2. The dish-shaped transducer provided by the invention does not need watertight treatment measures such as polyurethane potting or rubber vulcanization, has excellent seawater soaking resistance, and is suitable for long-term underwater deployment.
3. As shown in fig. 5, when the size is 500mm x 400mm, the resonant frequency is 800Hz, the transmitting voltage response of the resonant point is 145.3dB, and within the frequency band of 800-3000Hz, the fluctuation of the transmitting voltage response is less than 5dB, so that the requirements of most underwater acoustic equipment on the low-frequency transducer can be met, and the method has wide application prospect.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a driving unit according to the present invention;
FIG. 3 is a schematic view of the structure of the upper housing of the present invention;
FIG. 4 is a schematic view of the structure of the lower housing of the present invention;
fig. 5 is a schematic diagram of a transmission voltage response curve according to the present invention.
The figure shows:
Unpolarized piezoelectric ceramic sheet 9 of driving unit 3
Transition block 4 cable head 10
Fastening screw 6
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The invention discloses a low-frequency broadband disc-shaped transducer, which realizes the coupling of a longitudinal vibration mode of a driving unit and a bending vibration mode of a shell, greatly improves the working bandwidth of the transducer, and has excellent pressure resistance compared with the prior art, and the upper shell and the lower shell form a completely closed disc-shaped structure.
The low-frequency broadband dish-shaped transducer provided by the invention, as shown in figures 1-4, comprises an upper shell 1, a lower shell 2, a driving unit 3, a prestress assembly and a cable 7, wherein the outer edge of the upper shell 1 is hermetically connected with the outer edge of the lower shell 2 to form a dish-shaped shell; preferably, the outer edge of the upper housing 1 is fastened to the outer edge of the lower housing 2 by a plurality of fastening screws 6 arranged in the circumferential direction.
As shown in fig. 1, the driving unit 3 is disposed inside the butterfly-shaped housing, two ends of the driving unit 3 are respectively connected with the middle part of the upper housing 1 and the middle part of the lower housing 2, the pre-stressing assembly is connected with the driving unit 3 and is used for applying longitudinal pre-stressing to the driving unit 3, one end of the cable 7 is connected with the driving unit 3, and the other end of the cable 7 is located outside the butterfly-shaped housing.
The prestress assembly comprises a pair of transition blocks 4 and a prestress screw 5, wherein the pair of transition blocks 4 are respectively arranged between one end of the driving unit 3 and the upper shell 1 and between the other end of the driving unit 3 and the lower shell 2; preferably, one end of the transition block 4 is tightly connected with the upper housing 1 or the lower housing 2, and the other end of the transition block 4 is tightly connected with the driving unit 3.
The driving unit 3 is provided with a central hole penetrating longitudinally, the prestress screw 5 is arranged inside the central hole, two ends of the prestress screw 5 are fixedly connected with the paired transition blocks 4 respectively, the prestress screw 5 connects the transition blocks 4 and the driving unit 3 into a whole through the central hole, and prestress is applied to the driving unit 3.
In a preferred embodiment of the present invention, the length of the pre-stressing screw 5 is slightly smaller than the sum of the lengths of the transition block 4 and the driving unit 3, a certain pressure is applied to the transition block 4 and the driving unit 3 by a press machine when the pre-stressing screw 5 is installed (the pressure is determined according to the cross section of the driving unit 3), the pre-stressing screw 5 is tightened, and then the pressure is released, and the restoring force of the pre-stressing screw 5 applies pre-stressing force to the driving unit 3. As shown in fig. 1, the sum of the lengths of the transition block 4 and the driving unit 3 is larger than the height of the inner cavity formed by the upper casing 1 and the lower casing 2, and the fastening screw 6 is tightened when the upper casing 1 and the lower casing 2 are assembled, so that the upper casing 1 and the lower casing 2 are tightly connected.
As shown in fig. 2, the driving unit 3 includes a polarized piezoelectric ceramic stack 8 and unpolarized piezoelectric ceramic sheets 9 disposed at both ends of the polarized piezoelectric ceramic stack 8, and the polarized piezoelectric ceramic stack 8 includes an even number of polarized piezoelectric ceramic sheets bonded in a longitudinal stack; the polarization directions of the adjacent polarized piezoelectric ceramic plates are opposite, the positive electrode and the negative electrode of each polarized piezoelectric ceramic plate are welded with positive and negative wires through thin electrode plates to form a circuit in parallel connection, and the unpolarized piezoelectric ceramic plates 9 are adhered to the polarized piezoelectric ceramic stacks 8.
As shown in fig. 4, the lower casing 2 is provided with a sealing groove 11 on a connection surface with the upper casing 1, and a sealing ring with a proper size is selected to be placed in the sealing groove 11, so that watertight is realized when the upper casing 1 and the lower casing 2 are tightly connected. . As shown in fig. 3, the upper casing 1 is provided with a cable head 10, and the cable head 10 extends out of the outlet of the dish-shaped casing as a cable 7; the cable head 10 and the cable 7 are watertight treated. The watertight treatment comprises rubber vulcanization or polyurethane potting.
The upper shell 1 and the lower shell 2 are made of aluminum, steel, carbon fiber or titanium alloy. The material of the transition block 4 is aluminum, steel or titanium alloy; the material of the prestress screw 5 is titanium alloy or steel. In a preferred embodiment of the present invention, the materials of the upper housing 1, the lower housing 2, the transition block 4 and the prestressed screw 5 are all made of titanium alloy.
As shown in fig. 5, the disk-shaped transducer of the invention utilizes the coupling of the bending vibration mode and the longitudinal vibration mode, the transmitting voltage response of the resonance point is 145.3dB, and the fluctuation of the transmitting voltage response is less than 5dB in the frequency band of 800-3000Hz, thereby effectively expanding the working bandwidth of the transducer.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The low-frequency broadband dish-shaped transducer is characterized by comprising an upper shell (1), a lower shell (2), a driving unit (3), a prestress assembly and a cable (7), wherein the outer edge of the upper shell (1) is connected with the outer edge of the lower shell (2) in a sealing manner to form a dish-shaped shell;
the driving unit (3) is arranged inside the butterfly-shaped shell, two ends of the driving unit (3) are respectively connected with the middle part of the upper shell (1) and the middle part of the lower shell (2), the pre-stressing assembly is connected with the driving unit (3) and is used for applying longitudinal pre-stressing force to the driving unit (3), one end of the cable (7) is connected with the driving unit (3), and the other end of the cable (7) is positioned outside the butterfly-shaped shell.
2. The low frequency broadband disc transducer according to claim 1, characterized in that the pre-stressing assembly comprises a pair of transition blocks (4) and a pre-stressing screw (5), the pair of transition blocks (4) being arranged between one end of the drive unit (3) and the upper housing (1) and the other end of the drive unit (3) and the lower housing (2), respectively;
the driving unit (3) is internally provided with a central hole which is longitudinally communicated, the prestress screw (5) is arranged in the central hole, two ends of the prestress screw (5) are fixedly connected with the paired transition blocks (4) respectively, and the prestress screw (5) applies longitudinal prestress to two ends of the driving unit (3) through the paired transition blocks (4) respectively.
3. The low frequency broadband disc transducer according to claim 2, wherein one end of the transition block (4) is tightly connected to the upper housing (1) or the lower housing (2), and the other end of the transition block (4) is tightly connected to the drive unit (3).
4. The low-frequency broadband disk transducer according to claim 1, characterized in that the outer edge of the upper housing (1) is fastened to the outer edge of the lower housing (2) by means of a plurality of circumferentially arranged fastening screws (6).
5. The low-frequency broadband disc transducer according to claim 1, wherein the driving unit (3) comprises a polarized piezoelectric ceramic stack (8) and unpolarized piezoelectric ceramic sheets (9) disposed at both ends of the polarized piezoelectric ceramic stack (8), the polarized piezoelectric ceramic stack (8) comprising an even number of polarized piezoelectric ceramic sheets bonded in a longitudinal stack;
the polarization directions of the adjacent polarized piezoelectric ceramic plates are opposite, the positive electrode and the negative electrode of each polarized piezoelectric ceramic plate are welded with positive and negative wires through thin electrode plates to form a circuit in parallel connection, and the unpolarized piezoelectric ceramic plates (9) are adhered to the polarized piezoelectric ceramic stacks (8).
6. The low frequency broadband disc transducer according to claim 1, wherein the upper housing (1) and the lower housing (2) are each of aluminium, steel, carbon fibre or titanium alloy.
7. The low frequency broadband disc transducer according to claim 2, wherein the material of the transition block (4) is aluminium, steel or a titanium alloy;
the prestress screw (5) is made of titanium alloy or steel.
8. The low-frequency broadband disc transducer according to claim 1, characterized in that the lower housing (2) is provided with a sealing groove (11) on the connection surface with the upper housing (1), the sealing groove (11) being internally provided with a sealing ring.
9. The low frequency broadband disc transducer according to claim 1, characterized in that a cable head (10) is provided on the upper housing (1), which cable head (10) extends out of the disc housing outlet as a cable (7);
the cable head (10) and the cable (7) are subjected to watertight treatment.
10. The low frequency broadband dish-shaped transducer of claim 9, wherein the watertight treatment comprises rubber vulcanization or polyurethane potting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310087674.9A CN116037443A (en) | 2023-01-30 | 2023-01-30 | Low frequency broadband dish-shaped transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310087674.9A CN116037443A (en) | 2023-01-30 | 2023-01-30 | Low frequency broadband dish-shaped transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116037443A true CN116037443A (en) | 2023-05-02 |
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ID=86116288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310087674.9A Pending CN116037443A (en) | 2023-01-30 | 2023-01-30 | Low frequency broadband dish-shaped transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116037443A (en) |
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2023
- 2023-01-30 CN CN202310087674.9A patent/CN116037443A/en active Pending
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