Multilateral conformal emission sound source based on bending vibration, manufacturing method and application

Abstract

The invention discloses a multilateral conformal emission sound source based on bending vibration, which comprises a multilateral conformal emission sound source shell, each surface of the multilateral conformal emission sound source shell is provided with a bending disc transducer, each bending disc transducer comprises a supporting seat, an air cavity of the supporting seat is internally provided with a supporting plate, and each supporting plate is provided with an air inlet and an air outlet. A piezoelectric ceramic piece is arranged on the front face of the supporting plate, the negative electrode face of the piezoelectric ceramic piece is bonded with the center of the front face of the supporting plate, a positive electrode lead is arranged on the positive electrode face of the piezoelectric ceramic piece, a negative electrode lead is arranged on the supporting plate, the positive electrode lead and the negative electrode lead are connected with a cable, and the cable is sent out from the back of the supporting seat. Meanwhile, the invention further discloses a manufacturing method of the multilateral conformal emission sound source and application of the multilateral conformal emission sound source installed on an underwater unmanned platform. The bending disc transducer with the air cavity is used as a vibration source, low-frequency high-power emission is achieved, the structural weight of the shared part of the underwater unmanned platform can be effectively reduced, and the problem that a low-frequency sound source is difficult to carry on a small UUV platform due to the weight is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater platform sound source emission devices, and in particular relates to a polygonal conformal emission sound source based on bending vibration, a manufacturing method and an application thereof. Background Art

[0002] At present, the transmitting transducer used on small UUVs generally adopts a mosaic ring transducer. Due to the limitation of its structural size, the operating frequency is several kHz to tens of kHz, which is relatively high. CN 115348504 A-A shell conformally driven magnetostrictive curved cylindrical transducer and its preparation method mentions that the magnetostrictive drive shell is used to vibrate and generate sound, but its slit structure introduces pressure resistance and watertightness problems.

[0003] The resonant frequency of the circular tube transducer is

[0004]

[0005] Where r is the average radius of the tube, ρ is the density of the piezoelectric ceramic, S1 E 1 is the compliance coefficient of piezoelectric ceramics. It can be seen that the circular tube transducer is inversely proportional to the diameter. For a small UUV with an outer diameter not exceeding Ф533mm, its resonant frequency in air is about 1.8kHz, and its resonant frequency in water is 1.4kHz.

[0006] In order to further reduce the working frequency of the sound source, the present invention proposes a polygonal conformal emission sound source design based on bending vibration, using a curved disk transducer with an air cavity as the vibration source, reducing the structural weight of the common parts of the underwater unmanned platform, and realizing low-frequency emission without increasing the platform load weight and affecting the external structural design of the installation platform.

[0007] The present invention focuses on the rational use of the volume space and external structure of the underwater unmanned platform. By using a vibration source structure with an air cavity to replace the structural shell of the common part of the platform, the problem that the low-frequency transmitting transducer is large in size and weight and difficult to be assembled on a micro-unmanned platform is solved. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention proposes a polygonal conformal emission sound source based on bending vibration and a manufacturing method and application, which enables the UUV to have a low-frequency emission function under the premise of specific weight and volume space restrictions, thereby achieving a further reduction in the operating frequency.

[0009] The technical solution of the present invention is:

[0010] A polygonal conformal transmitting sound source based on bending vibration comprises a polygonal conformal transmitting sound source shell, each surface of the polygonal conformal transmitting sound source shell is mounted with a bending disk transducer, each bending disk transducer comprises a support seat, the support seat has an air cavity, a support plate is mounted in the air cavity, a piezoelectric ceramic sheet is arranged on the front of the support plate to form a double-laminated bending disk vibrator, the negative electrode surface of the piezoelectric ceramic sheet is bonded to the center of the front of the support plate, a positive electrode lead is arranged on the positive electrode surface outside the piezoelectric ceramic sheet, the positive electrode lead passes through the threading hole on the support plate and is connected to a cable, a negative electrode lead is arranged on the support plate and is connected to the cable, a switching structure is installed at the rear of the support seat, and the cable is sent out from the support seat and the switching structure at the rear.

[0011] Furthermore, the shape of the polygonal conformal sound source shell is a quadrilateral, a hexagon, an octagon, or other regular geometric polygons.

[0012] Furthermore, the polygonal conformal emission sound source shell is made of aluminum alloy material.

[0013] Furthermore, the piezoelectric ceramic sheet is made of PZT-8 material, the support plate is made of titanium alloy material, the support seat is made of carbon fiber material, and the transfer structure is made of stainless steel material.

[0014] Furthermore, a watertight potting layer is provided above the support plate and the piezoelectric ceramic sheet.

[0015] Furthermore, a watertight structure is provided between the adapter structure and the cable.

[0016] Furthermore, a plurality of mounting threaded holes are evenly arranged at the rear of the support seat, and the curved disk transducer is mounted on the polygonal conformal emission sound source shell by screws.

[0017] Furthermore, a piezoelectric ceramic sheet is arranged on the back of the support plate, and the support plate and the two piezoelectric ceramic sheets constitute a triple-laminate bending disk vibrator.

[0018] The present invention provides a method for manufacturing a polygonal conformal emission sound source based on bending vibration, comprising the following steps:

[0019] (1) preparing a support base, a connection structure, a support plate, a piezoelectric ceramic sheet, electrode leads and cables for assembling a curved disk transducer, and a polygonal conformal transmitting sound source housing including a plurality of curved disk transducer mounting surfaces;

[0020] (2) First, the negative electrode surface of the thickness-polarized piezoelectric ceramic sheet is bonded to the center of the circle on the front side of the support plate to form a double-laminated bending disk vibrator. The support plate is grounded to form the negative electrode of the bending disk transducer. The positive electrode surface of the piezoelectric ceramic is used as a power supply to set a positive lead. The positive lead is routed through the threading hole on the support plate. The negative electrode is connected to the support plate, and the positive lead and the negative lead are both connected to the wiring of the cable to complete the connection between the positive and negative electrodes of the double-laminated bending disk vibrator and the cable;

[0021] (3) Install an adapter structure behind the support seat, pass the cable through the support seat and the adapter structure, set a watertight structure between the adapter structure and the cable, and then install the double-laminated bending disk vibrator with completed cable connection on the support seat by interference fit or adhesive bonding;

[0022] (4) After the assembly is completed, a cavity is formed between the double-laminated bending disk vibrator and the upper part of the support seat, and a watertight potting layer is formed by pouring polyurethane glue to make a bending disk transducer;

[0023] (5) The injection molded curved disk transducer is fastened to the polygonal conformal emission sound source shell by screws to form the final polygonal conformal emission sound source.

[0024] The present invention also provides an underwater unmanned platform, including an underwater unmanned platform shell, on which one or more polygonal conformal transmitting sound sources based on bending vibration are installed, the polygonal conformal transmitting sound sources are integrally formed or integrally installed with the underwater unmanned platform shell, the polygonal conformal transmitting sound source shell and the underwater unmanned platform shell are made of the same material, or the polygonal conformal transmitting sound source is connected to the underwater unmanned platform shell as a separate component, and the connection portion is watertight.

[0025] The beneficial effects of the present invention are:

[0026] 1. The polygonal conformal transmitting sound source has two working modes: 1) When the curved disk transducer is powered in the same phase, it can realize radial (circumferential direction) non-directional, low-frequency and high-power transmission; 2) When the curved disk transducer is powered in opposite phases symmetrically, it can realize low-frequency transmission with dipole directivity;

[0027] 2. Provides a polygonal conformal emission sound source based on bending vibration, which uses several curved disc transducers with air cavities as vibration sources, can achieve low-frequency and high-power emission, has reasonable design, compact structure, beautiful and durable, excellent performance, and the manufacturing method provided is easy to operate, has good stability and high efficiency;

[0028] 3. The metal shell structure of the installation platform is replaced by a polygonal conformal emission sound source, and the carbon fiber material that constitutes the curved disc transducer is lighter than the metal material, which can effectively reduce the structural weight of the common part of the underwater unmanned platform, solving the problem that the low-frequency sound source is difficult to carry on a small UUV platform due to its weight;

[0029] 4. The polygonal conformal emission sound source can be applied to underwater mobile detection platforms (UUV, AUV, etc.), and is also suitable for underwater target detection, underwater target simulation and underwater acoustic communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the structural diagram of the bending disk transducer;

[0031] Figure 2 It is a cross-sectional view of the structure of the bending disk transducer;

[0032] Figure 3 This is a diagram of the structure of a polygonal conformal emission sound source;

[0033] Figure 4 It is a cross-sectional view of the structure of a polygonal conformal emission sound source;

[0034] Figure 5 It is a transmission voltage response level curve diagram of the polygonal conformal transmitting sound source when 6 curved disk transducers are powered in phase;

[0035] Figure 6 is the sound source level curve at the resonant frequency of 530Hz;

[0036] Figure 7 The directivity diagram at 500Hz when six curved disk transducers are powered symmetrically and in opposite phases, where: Figure 7 (a) is a structural diagram of six curved disk transducers symmetrically powered in opposite phases. Figure 7 (b) is the directivity diagram at 500Hz when six curved disk transducers are powered symmetrically and in opposite phases, with radial dipole directivity.

[0037] Figure 8 Installation status diagram of underwater unmanned platform and a polygonal conformal emission sound source;

[0038] Fig. 9 Installation status diagram of underwater unmanned platform and two polygonal conformal emission sound sources;

[0039] In the figure: 1- piezoelectric ceramic sheet, 2- support plate, 21- threading hole, 22- air cavity, 3- support seat, 31- mounting threaded hole, 4- adapter structure, 5- polygonal conformal transmitting sound source shell, 6- curved disk transducer, 60- positive phase power application area, 61- negative phase power application area, 7- polygonal conformal transmitting sound source, 8- underwater unmanned platform shell. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0041] Example 1

[0042] like Figures 1 to 4 As shown, the polygonal conformal transmitting sound source 7 designed in Example 1 uses the curved disk transducer 6 as the vibration source. The curved disk transducer 6 adopts a double-laminated structure with an air cavity 22, and is based on the premise that the outer diameter does not exceed Ф533mm. The conformal shell shape adopts a hexagonal structure.

[0043] A polygonal conformal transmitting sound source based on bending vibration in embodiment 1 comprises a polygonal conformal transmitting sound source shell 5, wherein the polygonal conformal transmitting sound source shell 5 is a hollow cylindrical structure, and an annular flange is arranged on both side end faces of the polygonal conformal transmitting sound source shell 5, and a curved disk transducer 6 is installed on each side of the polygonal conformal transmitting sound source shell 5, and each curved disk transducer 6 comprises a support seat 3, wherein the support seat 3 has an air cavity 22, and a support plate 2 is installed in the air cavity 22, and a piezoelectric ceramic sheet 1 is arranged on the front of the support plate 2, and the support plate 2 and the piezoelectric ceramic sheet 1 constitute a double-laminated curved disk vibrator, and a support plate 2 and the piezoelectric ceramic sheet 1 are arranged above the support plate 2 and the piezoelectric ceramic sheet 1. There is a watertight potting layer, the outer side of the piezoelectric ceramic sheet 1 is the positive electrode surface, the inner side of the piezoelectric ceramic sheet 1 is the negative electrode surface, the negative electrode surface of the piezoelectric ceramic sheet 1 is bonded to the center of the front side of the support plate 2, the positive electrode surface of the piezoelectric ceramic sheet 1 is provided with a positive electrode lead, and the support plate 2 is provided with a threading hole 21. The positive electrode lead passes through the threading hole 21 on the support plate 2 and is connected to the wiring of the cable in the air cavity 22. A negative electrode lead is provided on the support plate 2, and the negative electrode lead is connected to the wiring of the cable in the air cavity 22. A transfer structure 4 is installed in the middle of the rear of the support seat 3. The cable is sent out from the support seat 3 and the transfer structure 4 behind it, and a watertight structure is provided between the transfer structure 4 and the cable.

[0044] The specification of the polygonal conformal emission sound source shell 5 is Φ500*240mm (corresponding to the size of the polygonal conformal emission sound source 7), and it is made of aluminum alloy material.

[0045] The piezoelectric ceramic sheet 1 is a thickness-polarized piezoelectric ceramic disc with a specification of Φ144*3.5 mm. The piezoelectric ceramic sheet 1 is made of PZT-8 material, which has stable performance, low dielectric loss, and high power handling capability. Other common materials such as PZT-4 may also be used.

[0046] The support plate 2 is a circular titanium alloy support plate 2 with a specification of Φ180*3.5mm. The support plate 2 is made of titanium alloy material and has the properties of high strength, low density, heat resistance, corrosion resistance, and low temperature resistance.

[0047] The support seat 3 is made of carbon fiber material, which has higher strength than steel and has the properties of light weight, corrosion resistance, high temperature resistance, stability and good thermal conductivity.

[0048] The transfer structure 4 is made of stainless steel, which has high strength, heat resistance and corrosion resistance.

[0049] A plurality of mounting threaded holes 31 are evenly arranged at the rear of the support base 3 , and the curved disk transducer 6 is mounted on the polygonal conformal emission sound source housing 5 by screws.

[0050] In order to further improve the emission capability, the embodiment 1 may be improved and optimized: a ceramic sheet with opposite polarization direction is added to the back of the support plate 2 to form a parallel three-stack structure.

[0051] Embodiment 1 provides a method for manufacturing a polygonal conformal emitting sound source based on bending vibration, and the specific implementation steps are as follows:

[0052] (1) preparing a support base 3, a connection structure, a support plate 2, a piezoelectric ceramic sheet 1, electrode leads and cables, and a polygonal conformal transmitting sound source housing 5 including a plurality of mounting surfaces for the bending disk transducer 6;

[0053] (2) First, the negative electrode surface of the thickness-polarized piezoelectric ceramic sheet 1 is bonded to the center of the circle on the front side of the support plate 2 to form a double-laminated bending disk oscillator. The support plate 2 is grounded and forms the negative electrode of the bending disk transducer 6. The positive electrode surface of the piezoelectric ceramic is used as a power source to set a positive lead. The positive lead is routed through the threading hole 21 on the support plate 2. The negative electrode is connected to the support plate 2, and the positive lead and the negative lead are both connected to the wiring of the cable, completing the connection between the positive and negative electrodes of the double-laminated bending disk oscillator and the cable;

[0054] (3) Install the adapter structure 4 behind the support seat 3, pass the cable through the support seat 3 and the adapter structure 4, set a watertight structure between the adapter structure 4 and the cable, and then install the double-laminated bending disk vibrator with completed cable connection on the support seat 3 by interference fit or adhesive bonding;

[0055] (4) After the assembly is completed, a cavity is formed between the double-laminated bending disk vibrator and the upper part of the support seat 3, and a watertight potting layer is formed by pouring polyurethane glue to make a bending disk transducer 6;

[0056] (5) The injection-molded curved disk transducer 6 is fastened to the polygonal conformal emission sound source shell 5 by screws to form the final polygonal conformal emission sound source 7.

[0057] It can be understood that the polygonal conformal sound source shell 5 in Example 1 adopts a hexagonal structure, which is also applicable when it is designed as a quadrilateral, octagonal or other regular geometric polygonal structure.

[0058] The polygonal conformal emission sound source 7 of Example 1 has a design size of Φ500*240mm and has two working modes:

[0059] 1. When the six curved disk transducers 6 are powered in phase, the radial (circumferential) voltage response level curve is as follows: Figure 5 As shown, the operating frequency drops to 530 Hz, and there is no directivity in the radial direction (circumferential direction); the polygonal conformal transmitting sound source 7 designed in Example 1 has good linearity under high voltage at the resonant frequency of 530 Hz, as shown in FIG. Figure 6 As shown, at a voltage of 900V, the sound source level reaches 195.5dB, which can achieve low-frequency and high-power transmission;

[0060] 2. When the six bending disk transducers 6 are pressed as Figure 7 When symmetrical reverse power is applied as shown in (a) (the three disk transducers in the positive phase power application area 60 are powered in positive phase, and the three disk transducers in the reverse phase power application area 61 are powered in reverse phase), there is a dipole directivity in the radial direction. The directivity diagram at 500 Hz is as follows: Figure 7 as shown in (b).

[0061] Example 2

[0062] like Figure 8 and Fig. 9 As shown, Example 2 provides an underwater unmanned platform, on which one or two polygonal conformal transmitting sound sources 7 are installed on the shell 8 of the underwater unmanned platform. The polygonal conformal transmitting sound source 7 is integrally formed or integrally installed with the shell 8 of the underwater unmanned platform. The material of the polygonal conformal transmitting sound source shell 5 and the shell of the underwater unmanned platform can be the same aluminum alloy material. In addition to the good low-frequency transmitting effect, the lightweight and low energy consumption of the underwater unmanned platform are also achieved.

[0063] In some other embodiments, the polygonal conformal transmitting sound source 7 may be connected to the underwater unmanned platform shell 8 as a separate component, and the connection portion may be watertightened to achieve the same effect.

[0064] If greater transmission capability is desired, a half-wavelength array can be used. Taking a frequency of 500 Hz as an example, the half-wavelength is 1.5 m, which can be satisfied by the length dimensions of existing underwater unmanned platforms. The transmission capability at the resonant frequency can be increased by 6 dB.

[0065] In summary, the present invention has the following characteristics:

[0066] 1. The polygonal conformal transmitting sound source of the present invention has two working modes: 1) when the curved disk transducer 6 is powered in the same phase, it can realize radial (circumferential direction) non-directional, low-frequency and high-power transmission; 2) when the curved disk transducer 6 is powered in opposite phases symmetrically, it can realize low-frequency transmission with dipole directivity;

[0067] 2. The present invention proposes a polygonal conformal transmitting sound source based on bending vibration, which uses a plurality of curved disk transducers 6 with air cavities 22 as vibration sources, and replaces the metal shell structure of the installation platform with the polygonal conformal transmitting sound source, thereby reducing the structural weight of the common part of the underwater unmanned platform, and better meets the installation and use requirements of the small UUV platform without increasing the platform load weight and changing the external structural design of the installation platform.

[0068] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent modifications made on the basis of the above embodiments belong to the protection scope of the present invention.

Claims

1. A polygonal conformal emission sound source based on bending vibration, comprising a polygonal conformal emission sound source shell, characterized in that: A curved disk transducer is installed on each surface of the polygonal conformal emitting sound source shell, and each curved disk transducer includes a support seat, the support seat has an air cavity, a support plate is installed in the air cavity, a piezoelectric ceramic sheet is arranged on the front of the support plate to form a double-laminated curved disk oscillator, the negative electrode surface of the piezoelectric ceramic sheet is bonded to the center of the front of the support plate, a positive electrode lead is arranged on the positive electrode surface outside the piezoelectric ceramic sheet, the positive electrode lead passes through the threading hole on the support plate and is connected to the cable, a negative electrode lead is arranged on the support plate and is connected to the cable, a transfer structure is installed behind the support seat, and the cable is sent out from the support seat and the transfer structure behind it.

2. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: The shape of the polygonal conformal sound source emission shell is a quadrilateral, a hexagon or an octagon.

3. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: The polygonal conformal emission sound source shell is made of aluminum alloy material.

4. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: The piezoelectric ceramic sheet is made of PZT-8 material, the support plate is made of titanium alloy material, the support seat is made of carbon fiber material, and the transfer structure is made of stainless steel material.

5. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: A watertight potting layer is arranged above the support plate and the piezoelectric ceramic sheet.

6. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: A watertight structure is arranged between the transfer structure and the cable.

7. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: A plurality of mounting threaded holes are evenly arranged at the rear of the support seat, and the curved disk transducer is mounted on the polygonal conformal emission sound source shell by screws.

8. The polygonal conformal emitting sound source based on bending vibration according to claim 1, characterized in that: A piezoelectric ceramic sheet is arranged on the back of the support plate, and the support plate and the two piezoelectric ceramic sheets constitute a three-laminate bending disk vibrator.

9. A method for manufacturing a polygonal conformal emitting sound source based on bending vibration as claimed in claim 1, characterized in that: The steps include: (1) preparing a support base, a connection structure, a support plate, a piezoelectric ceramic sheet, electrode leads and cables for assembling a curved disk transducer, and a polygonal conformal transmitting sound source housing including a plurality of curved disk transducer mounting surfaces; (2) First, the negative electrode surface of the thickness-polarized piezoelectric ceramic sheet is bonded to the center of the circle on the front side of the support plate to form a double-laminated bending disk vibrator. The support plate is grounded to form the negative electrode of the bending disk transducer. The positive electrode surface of the piezoelectric ceramic is used as a power supply to set a positive lead. The positive lead is routed through the threading hole on the support plate. The negative electrode is connected to the support plate, and the positive lead and the negative lead are both connected to the wiring of the cable to complete the connection between the positive and negative electrodes of the double-laminated bending disk vibrator and the cable; (3) Install an adapter structure behind the support seat, pass the cable through the support seat and the adapter structure, set a watertight structure between the adapter structure and the cable, and then install the double-laminated bending disk vibrator with completed cable connection on the support seat by interference fit or adhesive bonding; (4) After the assembly is completed, a cavity is formed between the double-laminated bending disk vibrator and the upper part of the support seat, and a watertight potting layer is formed by pouring polyurethane glue to make a bending disk transducer; (5) The injection molded curved disk transducer is fastened to the polygonal conformal emission sound source shell by screws to form the final polygonal conformal emission sound source.

10. An underwater unmanned platform, comprising an underwater unmanned platform shell, characterized in that: The underwater unmanned platform shell is equipped with at least one polygonal conformal transmitting sound source as described in claim 1, the polygonal conformal transmitting sound source is integrally formed or integrally installed with the underwater unmanned platform shell, the polygonal conformal transmitting sound source shell and the underwater unmanned platform shell are made of the same material, or the polygonal conformal transmitting sound source is connected to the underwater unmanned platform shell as a separate component, and the connection part is watertight.

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