CN214203200U - Small-size low-frequency non-resonant underwater acoustic transducer and system applied to active sound absorption - Google Patents

Abstract

The utility model discloses a be applied to active sound absorption's non-resonance underwater transducer of small-size low frequency and system, including piezoceramics group, rigid foam, PCB circuit board A, PCB circuit board B, shielding copper mesh A, shielding copper mesh B and output cable conductor, wherein shielding copper mesh A, PCB circuit board A, rigid foam, piezoceramics group and PCB circuit board B connect gradually, piezoceramics group constitute by N piezoceramics post, the rigid foam in the middle of have with piezoceramics post size, quantity unanimous hole for place N piezoceramics post; the PCB circuit board A and the PCB circuit board B are porous printed circuit boards, and the position of a hole in each circuit board is consistent with that of the piezoelectric ceramic column. The utility model discloses to the sound wave of external radiation to transducer surface, the system is according to calculation modeling, control process, and the excitation transducer vibration can realize transducer surface vibration's regulation for transducer surface space sound field reflection coefficient reduces.

Description

Small-size low-frequency non-resonant underwater acoustic transducer and system applied to active sound absorption

Technical Field

The utility model relates to an energy converter field mainly is a small-size low frequency non-resonance underwater acoustic transducer and system for initiatively absorb sound.

Background

The submarine can realize deep penetration in a concealed way by virtue of excellent stealth performance, executes various battle tasks such as reconnaissance, detection, striking, blocking and the like, is used for acquiring the advantages of underwater information, implementing the core force of the strategic targets of 'anti-intervention and regional denial' and plays an increasingly important role in the future underwater information battle. The submarine improves stealthy ability and is an important guarantee of submarine operational ability.

The noise level of the stealth submarine approaches the noise of the marine environment, so that the detection capability of the passive sonar is weaker and weaker, and the development of low-frequency active sonar becomes a main mode for detecting the stealth submarine, such as American HELRAS (high energy radio access system) aviation lifting sonar, the working frequency is 1.3-1.5 kHz, and the sound source level is 219 dB; the strategic SURTAS LFA active and passive towed line array sonar in the United states has the working frequency of 100-500 Hz and the sound source level of 235dB, and the detection capability of the submarine to be hidden exceeds 100 km. The development of low-frequency sonar puts higher requirements on the low-frequency stealth performance of a submarine, the traditional anechoic tile adopts a passive sound absorption working mode, the sound wave absorption performance below 2kHz is limited, and the requirement of sound absorption below 1kHz cannot be met, so that active sound absorption becomes the most effective technical way for solving the problem of low-frequency sound wave absorption.

Aiming at the low-frequency active sonar which is vigorously developed by naval forces in various countries at present, a transducer with the function of low-frequency aorta impact sound absorption needs to be developed, namely, the input impedance at the interface of the transducer is adjusted in an active sound absorption mode to be matched with water, and finally the low-frequency stealth performance of the submarine is improved by using the small-size transducer. Therefore, there is a need to develop a small-sized low-frequency non-resonant underwater acoustic transducer for active sound absorption to achieve the above functions.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of prior art existence, realize controlling transducer surface acoustic impedance and provide a be applied to active sound absorption's small-size low frequency non-resonant underwater acoustic transducer and system, can adjust transducer surface vibration, verified the feasibility of active sound absorption under water, realized full frequency channel stealthy for following novel submarine and established technical basis.

The purpose of the utility model is accomplished through following technical scheme. A small-size low-frequency non-resonant underwater acoustic transducer applied to active sound absorption comprises a piezoelectric ceramic group, hard foam, a PCB A, PCB circuit board B, a shielding copper mesh A, a shielding copper mesh B and an output cable, wherein the shielding copper mesh A, PCB circuit board A, the hard foam, the piezoelectric ceramic group and the PCB circuit board B are sequentially connected, the piezoelectric ceramic group consists of N piezoelectric ceramic columns, and holes with the same size and quantity as the piezoelectric ceramic columns are formed in the middle of the hard foam and used for placing the N piezoelectric ceramic columns; the PCB A and the PCB B are porous printed circuit boards, the position of a hole in the circuit board is consistent with that of the piezoelectric ceramic column, one end of each of the N piezoelectric ceramic columns is welded with the PCB B, and the other end of each of the N piezoelectric ceramic columns penetrates through the hard foam to be welded with the PCB A; and the output cable leads out the positive electrode and the negative electrode of the transducer and is connected to an excitation source to excite the transducer to vibrate. The shielding copper mesh is used for avoiding mutual interference between large voltage for driving ceramic vibration and small voltage for receiving signals by the hydrophone in the using process of the transducer.

The rigid foam is made of decoupling materials, so that the underwater acoustic transducer has transverse mode coupling resistance, and the surface of the underwater acoustic transducer in a working frequency band vibrates uniformly.

The piezoelectric ceramic group is used as an active drive, the circuit boards B are connected in parallel through the PCB A, PCB, and the piezoelectric ceramic is polarized along the thickness direction.

The utility model also discloses a small-size low frequency non-resonance underwater acoustic transducer system for initiative sound absorption, including small-size low frequency non-resonance underwater acoustic transducer and signal pickup, small-size low frequency non-resonance underwater acoustic transducer is connected with signal pickup through sound absorption structural layer, radiates the sound wave on transducer surface to the external world, and the system is according to calculation modeling, control process, and excitation transducer vibration can realize transducer surface vibration's regulation for transducer surface space sound field reflection coefficient reduces.

The utility model has the advantages that: the piezoelectric ceramic assembly and the porous printed circuit board welding effectively improve the low-frequency transmission voltage response of the transducer, the minimum working frequency of the small-size low-frequency non-resonant underwater acoustic transducer reaches 500Hz, and the transmission voltage response reaches 1k @85dB when a circular surface with the diameter of phi 200mm is formed; the adoption of the hard foam decoupling material realizes the uniform vibration of the inner surface of the flat transmitting transducer in the working frequency band, and lays a foundation for the physical cancellation of low-frequency reflected sound waves.

Drawings

FIG. 1: the structure of the small-sized low-frequency non-resonant underwater acoustic transducer is exploded;

FIG. 2: a small-size low-frequency non-resonant underwater acoustic transducer system forms a block diagram;

FIG. 3: a small-size low-frequency non-resonant underwater acoustic transduction working flow chart;

FIG. 4: the small-sized low-frequency non-resonant underwater acoustic transducer emits a voltage response diagram.

Description of reference numerals: the acoustic transducer comprises a 1-shielding copper mesh A, a 2-PCB circuit board A, 3-rigid foam, a 4-piezoelectric ceramic group, a 5-PCB circuit board B, a 6-shielding copper mesh B, a 10-small-size low-frequency non-resonant underwater acoustic transducer, a 11-sound absorption structure layer and a 12-signal pickup.

Detailed Description

The invention will be described in further detail with reference to the following detailed description and accompanying drawings:

referring to fig. 1, the small-sized low-frequency non-resonant underwater acoustic transducer realized by the present invention is structurally exploded. In the example, the size of the shielding copper mesh is phi 200mmX0.2mm, the size of the PCB circuit board is phi 200mmX0.5mm, the size of the rigid foam is phi 200mmX6mm, and the size of the piezoelectric ceramic group is 4mmX4mmX6 mm.

Referring to fig. 2, a block diagram of a small-sized low-frequency non-resonant underwater acoustic transducer system according to the present invention is shown.

Referring to fig. 3, it is the small-sized low-frequency non-resonant underwater acoustic transduction working flow chart of the present invention.

Referring to fig. 4, it is a response diagram of the transmission voltage of the small-sized low-frequency non-resonant underwater acoustic transducer of the present invention.

The utility model discloses a be applied to non-resonance underwater transducer of small-size low frequency of initiative sound absorption, including piezoceramics group 4, rigid foam 3, PCB circuit board A2, PCB circuit board B5, shielding copper mesh A1, shielding copper mesh B6 and output cable conductor, wherein shielding copper mesh A1, PCB circuit board A2, rigid foam 3, piezoceramics group 4 and PCB circuit board B5 connect gradually, piezoceramics group 4 constitute by a N piezoceramics post. The rigid foam 3 is made of decoupling materials, so that the underwater acoustic transducer has transverse mode coupling resistance, and the surface of the underwater acoustic transducer in a working frequency band vibrates uniformly. Holes with the same size and number as the piezoelectric ceramic columns are formed in the middle of the rigid foam 3 and used for placing the N piezoelectric ceramic columns; the PCB A2 and the PCB B5 are porous printed circuit boards, the position of a hole in the circuit board is consistent with that of a piezoelectric ceramic column, one end of each of the N piezoelectric ceramic columns is welded with the PCB B5, and the other end of each of the N piezoelectric ceramic columns penetrates through the hard foam 3 to be welded with the PCB A2; the piezoelectric ceramic group 4 is used as an active drive and is connected in parallel through a PCB circuit board A2 and a PCB circuit board B5, and the piezoelectric ceramic is polarized along the thickness direction. And the output cable leads out the positive electrode and the negative electrode of the transducer and is connected to an excitation source to excite the transducer to vibrate.

As shown in fig. 2, the utility model discloses a be applied to non-resonant underwater acoustic transducer system of small-size low frequency of initiative sound absorption, including non-resonant underwater acoustic transducer 10 of small-size low frequency and signal pickup 12, non-resonant underwater acoustic transducer 10 of small-size low frequency is connected with signal pickup 12 through sound absorption structural layer 11, to the sound wave on external radiation transducer surface, the system is according to calculation modeling, control process, and the excitation transducer vibrates, can realize the regulation of transducer surface vibration for transducer surface space sound field reflection coefficient reduces.

A be applied to non-resonance underwater transducer of small-size low frequency of initiative sound absorption, it mainly includes following step:

the method comprises the following steps: calculating the thickness, sectional area size and the like of the piezoelectric ceramic group according to the working frequency band of the small-size low-frequency non-resonant underwater acoustic transducer;

step two: obtaining the number of the piezoelectric ceramic columns according to the size of the small-size low-frequency non-resonant underwater acoustic transducer and the requirement of sending voltage response;

step three: according to the performance requirements of the small-size low-frequency non-resonant underwater acoustic transducer, a rigid foam decoupling material is selected, holes with the size and the number consistent with those of the piezoelectric ceramic columns are designed on the rigid foam, the rigid foam can inhibit the transverse vibration mode of the piezoelectric ceramic, and the surface of the transducer can vibrate uniformly;

step four: a thin layer of sealant is uniformly coated on the outer surface of the rigid foam, so that the situation that the sealant flows into the pores of the rigid foam to generate bubbles during pouring can be avoided;

step five: the piezoelectric ceramic column is plugged into the hard foam, the anode is arranged above the piezoelectric ceramic column, the cathode is arranged below the piezoelectric ceramic column, and each ceramic particle is relatively independent;

step six: respectively covering a PCB with holes with the number equal to that of the piezoelectric ceramic columns on the positive and negative surfaces of the piezoelectric ceramic, wherein the inside of the PCB is in a conducting state, and the outside of the PCB is treated by insulating paint to keep insulation;

step seven: welding the piezoelectric ceramic group with the PCB;

step eight: welding wires on the inner sides of the upper PCB and the lower PCB, and leading out the anode and the cathode of the transducer;

step nine: filling the assembled transducer with water-tight polyurethane to seal the transducer;

step ten: according to the coexistence characteristic of large voltage excitation and small voltage receiving in the small-size low-frequency non-resonant underwater acoustic transducer, the shielding copper net is arranged in a small voltage transmission path, so that the interference to small voltage signals is reduced;

step eleven: establishing a transmission model in the system according to external sound wave parameters received by the hydrophone in the working environment, and generating a control signal;

step twelve: exciting the transducer by using the control signal as a power amplifier signal source, and adjusting the surface vibration of the transducer to realize impedance matching of sound wave transmission;

step thirteen: according to the sound waves emitted by the small-size low-frequency non-resonant underwater acoustic transducer in a vibrating manner, the sound waves in the working environment can be offset, so that the reflection coefficient of the sound field in the surface space of the transducer is reduced.

Fourteen steps: and when parameters of signals received by the hydrophone in the working environment change, repeating the eleventh step to the thirteenth step.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims (4)

1. A small-size low-frequency non-resonant underwater acoustic transducer applied to active sound absorption is characterized in that: the piezoelectric ceramic array comprises a piezoelectric ceramic group (4), rigid foam (3), a PCB (printed circuit board) A (2), a PCB B (5), a shielding copper mesh A (1), a shielding copper mesh B (6) and an output cable, wherein the shielding copper mesh A (1), the PCB A (2), the rigid foam (3), the piezoelectric ceramic group (4) and the PCB B (5) are sequentially connected, the piezoelectric ceramic group (4) consists of N piezoelectric ceramic columns, and holes with the same size and number as the piezoelectric ceramic columns are formed in the middle of the rigid foam (3) and used for placing the N piezoelectric ceramic columns; the PCB A (2) and the PCB B (5) are porous printed circuit boards, the position of a hole in the circuit board is consistent with that of the piezoelectric ceramic column, one end of the N piezoelectric ceramic columns is welded with the PCB B (5), and the other end of the N piezoelectric ceramic columns penetrates through the hard foam (3) to be welded with the PCB A (2); and the output cable leads out the positive electrode and the negative electrode of the transducer and is connected to an excitation source to excite the transducer to vibrate.

2. A small-sized low frequency non-resonant underwater acoustic transducer for active sound absorption according to claim 1 wherein: the rigid foam (3) is made of decoupling materials, so that the underwater acoustic transducer has transverse mode coupling resistance, and the surface of the underwater acoustic transducer in a working frequency band vibrates uniformly.

3. A small-sized low frequency non-resonant underwater acoustic transducer for active sound absorption according to claim 1 wherein: the piezoelectric ceramic group (4) is used as an active drive and is connected in parallel through a PCB (printed circuit board) A (2) and a PCB (printed circuit board) B (5), and the piezoelectric ceramic is polarized along the thickness direction.

4. A small-size low-frequency non-resonant underwater acoustic transducer system applied to active sound absorption is characterized in that: the small-size low-frequency non-resonant underwater acoustic transducer comprises a small-size low-frequency non-resonant underwater acoustic transducer (10) and a signal pickup device (12), wherein the small-size low-frequency non-resonant underwater acoustic transducer (10) is connected with the signal pickup device (12) through a sound absorption structure layer (11), aiming at sound waves radiated to the surface of the transducer from the outside, the system stimulates the transducer to vibrate according to calculation modeling and control processes, and can realize adjustment of surface vibration of the transducer, so that the reflection coefficient of a sound field in the surface space of the transducer is reduced.

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