Novel barrel plate type flextensional transducer with special-shaped curved surface complex shell

Abstract

The invention provides a novel barrel plate type flextensional transducer with a special-shaped curved surface complex shell, which comprises a three-dimensional corrugated seamless shell formed by a metal 3D printing technology, a piezoelectric ceramic circular ring pile arranged in the shell, cover plates arranged at two ends of the piezoelectric ceramic circular ring pile, and gaskets arranged between the piezoelectric ceramic circular ring pile and the cover plates, arranging a prestressed screw rod which passes through the upper cover plate and is connected with the lower cover plate, wherein the upper cover plate is provided with a cable connecting hole; the piezoelectric ceramic rings are polarized in the thickness direction, electrode wires are led out of the upper surface and the lower surface of each piezoelectric ceramic ring respectively, and the cable is electrically connected with two electrodes of the piezoelectric ceramic rings. The integrated three-dimensional corrugated shell has the characteristics of low frequency, small size, wide band, light weight, higher power, high efficiency, high hydrostatic pressure resistance and the like, the integrated three-dimensional corrugated shell can realize deep water work by adopting the transducer without encapsulation or less encapsulation, and meanwhile, the integrated three-dimensional corrugated shell can realize coupling among different modes of the transducer to achieve the wide band characteristic.

Description

Technical Field

[0001] The invention belongs to the field of underwater acoustic transducers, and in particular relates to a novel barrel plate type flexural transducer with a special-shaped curved surface and a complex shell. Background Art

[0002] The development of unmanned underwater vehicles with long range is a promising direction for exploring the world's oceans. In order to achieve stable communication between underwater platforms within a range of tens of kilometers, compact low-frequency underwater acoustic transmitters with a certain working depth are needed. In the transceiver system, reducing the acoustic carrier frequency and increasing the transmission power will lead to a narrowing of the bandwidth, thereby reducing the transmission rate of the information channel. Therefore, special requirements are placed on the design characteristics, calculations and manufacturing processes of low-frequency underwater acoustic transmitters.

[0003] Therefore, the development of compact high-power density transducers with small size, low frequency and sufficiently wide radiation frequency bandwidth is still an urgent task. Flextensional transducers are one of the best transducers currently available to meet the above requirements, but achieving a certain water depth and broadband operation is still difficult, and the manufacture of flextensional transducer housings is one of the most tedious and complex processes in the manufacturing and debugging of underwater acoustic transducers. Therefore, the research on low-frequency flextensional transducer housings to achieve small size, light weight, broadband, deep water and other performance of the transducer is of great significance for the application of small platforms.

[0004] Whether it is a power-type low-frequency transducer with a concave shell or a compensating low-frequency transducer with a convex shell, the difficulty in manufacturing and assembling the conventional barrel plate type flexural transducer lies in the sealing of the shell gap, which is covered with rubber. The use depth of this type of transmitter is limited, and the performance changes significantly with the working depth, as well as the resulting selection of the working pressure of the static pressure compensator, puts forward strict requirements on the bonding strength of the shell gap covering layer. The process of wrapping the low-frequency transducer with an outer waterproof coating cannot guarantee that the frequency characteristics of the assembled transmitter are completely consistent with the calculated data. Therefore, after assembly, the asymmetric amplification ratio of the low-frequency transducer can reach 18% to 21%. This phenomenon indicates that there is a bending mode in the piezoelectric ceramic ring stack, which reduces the efficiency of the transmitter.

[0005] There are few existing literatures that mention seamless shell flexural transducers. Some work has been done to solve the problems of poor hydrostatic pressure resistance and low efficiency caused by the slotted shell. However, the methods are single and the research content is not comprehensive. In particular, there are many directions for improvement in achieving deep water, broadband and higher efficiency.

[0006] In view of the above problems, the present invention proposes a novel barrel plate type flexural transducer with a complex shell and a special-shaped curved surface, which solves the problems of the conventional barrel plate type flexural transducer and achieves better performance than the proposed seamless shell flexural transducer, such as broadband and high efficiency. Summary of the invention

[0007] In view of this, the present invention aims to propose a new type of barrel plate type flexural tensile transducer with a complex shell and special-shaped curved surface, which has the characteristics of low frequency, small size, wide bandwidth, light weight, high power, high efficiency and strong resistance to hydrostatic pressure, and combines the coupling between different vibration modes of the one-piece three-dimensional corrugated seamless shell to achieve a high emission voltage response in a wider frequency band.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A novel barrel plate type flexural transducer with a complex shell and a special-shaped curved surface comprises an integrated three-dimensional corrugated seamless shell, a piezoelectric ceramic ring stack, a gasket, and a prestressed screw; a prestressed screw is arranged inside the integrated three-dimensional corrugated seamless shell, the piezoelectric ceramic ring stack is sleeved on the prestressed screw, one end of the prestressed screw is connected to an upper cover plate, and the other end is connected to a lower cover plate, a gasket is arranged between the piezoelectric ceramic ring stack and the upper cover plate and the lower cover plate, and the integrated three-dimensional corrugated seamless shell is connected to the upper cover plate and the lower cover plate through the prestressed screw.

[0010] Furthermore, the one-piece three-dimensional corrugated seamless shell is a whole and has a complex special-shaped curved surface structure, which is used to improve the overall strength, improve the tolerance of the piezoelectric transducer to hydrostatic pressure, reduce the dispersion of transducer parameters, and simplify the configuration.

[0011] Furthermore, the one-piece three-dimensional corrugated seamless shell presents a structure of a rotating body, with circumferential and longitudinal three-dimensional corrugations, which are used to reduce the circumferential and longitudinal stiffness and achieve a more efficient mechanical amplification ratio.

[0012] Furthermore, the annular corrugations of the integrated three-dimensional corrugated seamless shell are composed of many small peaks and valleys of the same size, and the longitudinal corrugations are composed of tangent large peaks and valleys.

[0013] Furthermore, the thickness of the integrated three-dimensional corrugated seamless shell varies, and has a non-uniform thickness in the longitudinal direction of the ring.

[0014] Furthermore, the one-piece three-dimensional corrugated seamless shell is a whole that can directly contact the fluid, and the transducer can be sealed without potting or with watertight potting in a few places.

[0015] Furthermore, the one-piece three-dimensional corrugated seamless shell is made of titanium alloy material and is manufactured using metal 3D printing, and its appearance and internal structure present multi-dimensional complex curved surfaces.

[0016] Furthermore, the piezoelectric ceramic ring stack is made of PZT4 material, and each piezoelectric ceramic ring piece is bonded with epoxy resin.

[0017] Furthermore, the gasket is made of titanium alloy, and its outer diameter is the same as that of the piezoelectric ceramic ring stack, and its inner diameter is slightly smaller than that of the piezoelectric ceramic ring stack.

[0018] Furthermore, the cover plate is made of titanium alloy material, and its outer structure is a T-shaped frustum.

[0019] The beneficial effects of the present invention are:

[0020] The present invention proposes a new type of barrel plate type flex-tension transducer with a special-shaped curved surface and a complex shell, which overcomes the difficulties brought about by the manufacturing and assembly process of the slotted shell of the conventional plate barrel type flex-tension transducer, solves the problem of low work efficiency caused by the unevenness of the sealing of the slotted shell, and adopts an integrated three-dimensional corrugated seamless shell to form a new type of barrel plate type flex-tension transducer with a special-shaped curved surface and a complex shell. The overall strength of the integrated three-dimensional corrugated seamless shell is greater than that of the conventional transducer slat shell, so the integrated three-dimensional corrugated seamless shell improves the tolerance of the piezoelectric transducer to hydrostatic pressure, reduces the dispersion of the transducer parameters, and simplifies the configuration. Compared with the seamless shell flex-tension transducer that has been proposed, the unique distribution form of the circumferential and longitudinal corrugations of the integrated three-dimensional corrugated seamless shell reduces the circumferential and longitudinal stiffness of the shell, reduces the resonant frequency of the transducer, increases the radiation area of ​​the transducer, and improves the radiation power and efficiency of the transducer. The change in the axial curvature of the integrated three-dimensional corrugated seamless shell promotes the coupling between different vibration modes of the transducer, thereby achieving a high emission voltage response in a wider frequency band.

[0021] The novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell of the present invention can be used for transmitting underwater acoustic signals. As it has an integrated three-dimensional corrugated seamless shell, its working depth is greatly increased.

[0022] The design of the integrated three-dimensional corrugated seamless shell of the underwater acoustic transducer of the present invention eliminates the sealing process compared to the conventional plate-barrel type flexural transducer. Therefore, it has the characteristics of simple production process, stable performance, small size, low frequency, broadband, high power, pressure resistance, etc. It can be used for active detection or communication sound sources of underwater unmanned vehicles, and communicate with autonomous acoustic radio buoys-beacons that are part of the underwater vehicle control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a novel barrel plate type flexural transducer with a special-shaped curved surface and a complex shell according to the present invention;

[0024] Figure 2 It is a top view structural schematic diagram of a novel barrel plate type flextensional transducer with a special-shaped curved surface and complex shell according to the present invention;

[0025] Figure 3It is a top view cross-sectional schematic diagram of a novel barrel plate type flexural transducer with a special-shaped curved surface and a complex shell according to the present invention;

[0026] Figure 4 It is a front view structural schematic diagram of a novel barrel plate type flextensional transducer with a special-shaped curved surface and complex shell according to the present invention;

[0027] Figure 5 It is a front cross-sectional schematic diagram of a novel barrel plate type flexural transducer with a special-shaped curved surface and a complex shell according to the present invention;

[0028] Description of reference numerals:

[0029] 1-integrated three-dimensional corrugated seamless shell, 2-upper cover plate, 3-piezoelectric ceramic ring stack, 4-gasket, 5-prestressed screw, 6-lower cover plate. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings.

[0031] In order to fully express the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be described in full and clearly in conjunction with the drawings of the invention examples. Obviously, the embodiments described below are part of the embodiments of the present invention, but not all complete embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 - Figure 3 As shown, a novel barrel plate type flexural transducer with a complex shell and a special-shaped curved surface includes an integrated three-dimensional corrugated seamless shell 1, a piezoelectric ceramic ring stack 3 arranged inside the shell, an upper cover plate 2 and a lower cover plate 6 arranged at both ends of the piezoelectric ceramic ring stack 3, a gasket 4 is arranged between the piezoelectric ceramic ring stack 3 and the upper cover plate 2 and the lower cover plate 6, a prestressed screw 5 is arranged passing through the upper cover plate 2 and connecting the lower cover plate 6, and a cable connection hole is opened on the upper cover plate 2; the piezoelectric ceramic rings are polarized along the thickness direction, an electrode wire is led out from the upper and lower surfaces of each piezoelectric ceramic ring, and the cable is electrically connected to the two electrodes of the piezoelectric ceramic ring.

[0033] like Figure 4 and Figure 5As shown, the integrated three-dimensional corrugated seamless shell 1 is a whole, having corrugations in different dimensions, longitudinal and circumferential. The circumferential corrugations of the integrated three-dimensional corrugated seamless shell 1 are composed of many small peaks and valleys of the same size, and the longitudinal corrugations are composed of tangent large peaks and valleys. Compared with conventional barrel plate type flexural transducers, barrel plate type flexural transducers with complex shells with special-shaped curved surfaces eliminate the process of sealing the shell gap, increase the pressure resistance of the transducer and have stable performance. Compared with the proposed seamless shell flexural transducer, the introduction of corrugations in two different dimensions, longitudinal and circumferential, of the integrated three-dimensional corrugated seamless shell 1 reduces the circumferential and longitudinal stiffness of the shell, reduces the resonant frequency of the transducer, increases the radiation area of ​​the transducer, and improves the radiation power and efficiency of the transducer. The change in the curvature of the axis of the integrated three-dimensional corrugated seamless shell 1 promotes the coupling between different vibration modes of the transducer, thereby achieving a high emission voltage response in a wider frequency band.

[0034] like Figure 5 As shown, the one-piece three-dimensional corrugated seamless shell 1 of the novel barrel-plate type flexural transducer with special-shaped curved surface and complex shell has an circumferential corrugated profile composed of concave and convex arcs, and each concave and convex arc is tangent to each other, ensuring that the surface of the shell is smooth and flat.

[0035] The novel barrel plate type flextensional transducer with a special-shaped curved surface and a complex shell of the present invention has an integrated three-dimensional corrugated seamless shell 1 made of titanium alloy material by 3D printing technology, and its structure presents a rotating body. The use of titanium alloy material can increase the pressure resistance of the transducer and reduce the weight of the transducer.

[0036] The piezoelectric ceramic ring stack 3 is made of PZT4 material, and each piezoelectric ceramic ring piece is bonded with epoxy resin. The gasket 4 is made of titanium alloy and bonded to both ends of the piezoelectric ceramic ring stack 3.

[0037] The upper cover plate 2 and the lower cover plate 6 are made of titanium alloy material, and their outer structure is a T-shaped truncated cone. The height between the upper cover plate 2 and the lower cover plate 6 must match the height of the piezoelectric ceramic ring stack 3 and the gasket 4. The upper cover plate 2 and the lower cover plate 6 are connected and fixed to the integrated three-dimensional corrugated seamless shell 1 by screws. The prestressed screw 5 passes through the upper cover plate 2 and connects the lower cover plate 6. The material of the prestressed screw 5 is stainless steel.

[0038] The piezoelectric ceramic ring stack 3 is assembled into an integrated three-dimensional corrugated seamless housing 1 , and prestress is applied by a prestressing screw 5 .

[0039] The novel barrel plate type flextensional transducer with a special-shaped curved surface and a complex shell of the present invention simplifies the steps of transducer manufacturing and enhances the pressure resistance by using an integrated three-dimensional corrugated seamless shell. The corrugation reduces the stiffness of the integrated seamless shell, reduces the resonant frequency of the transducer, increases the radiation area of ​​the transducer, and improves the radiation power and efficiency of the transducer. The change in the axial curvature of the integrated three-dimensional corrugated seamless shell promotes the coupling between different vibration modes of the transducer, thereby achieving a high emission voltage response in a wider frequency band.

[0040] When the transducer of the present invention works as a transmitting sound source in water, due to the vibration characteristics of the axial corrugated structure of the integrated three-dimensional corrugated seamless shell, it can achieve coupling between two to three vibration modes, and then the transducer can smoothly achieve high-power transmission in a wide frequency band. Compared with the conventional plate barrel type flexural transducer shell, the integrated seamless shell has increased strength, allowing the transducer to continue to work in very deep waters, and reduces parameter dispersion, improving the reliability of the underwater acoustic transducer. The characteristics of these transducers make them suitable for active detection or communication sound sources of underwater unmanned vehicles, as well as communication with autonomous acoustic radio buoys-beacons that are part of the underwater vehicle control system.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of barrel-plate flexural transducer with special-shaped curved surface and complex shell, characterized by: The invention comprises an integrated three-dimensional corrugated seamless shell (1), a piezoelectric ceramic ring stack (3), a gasket (4), and a prestressed screw (5); the integrated three-dimensional corrugated seamless shell (1) is provided with a prestressed screw (5), the piezoelectric ceramic ring stack (3) is sleeved on the prestressed screw (5), one end of the prestressed screw (5) is connected to an upper cover plate (2), and the other end is connected to a lower cover plate (6), a gasket (4) is provided between the piezoelectric ceramic ring stack (3) and the upper cover plate (2) and the lower cover plate (6), and the integrated three-dimensional corrugated seamless shell (1) is connected to the upper cover plate (2) and the lower cover plate (6) via the prestressed screw (5).

2. According to claim 1, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The integrated three-dimensional corrugated seamless shell (1) is a whole and has a complex special-shaped curved surface structure, which is used to improve the overall strength, improve the tolerance of the piezoelectric transducer to hydrostatic pressure, reduce the dispersion of transducer parameters, and simplify the configuration.

3. According to claim 2, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The one-piece three-dimensional corrugated seamless shell (1) presents a structure of a rotating body, and has circumferential and longitudinal three-dimensional corrugations, which are used to reduce the circumferential and longitudinal stiffness and achieve a more efficient mechanical amplification ratio.

4. According to claim 3, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The annular corrugations of the one-piece three-dimensional corrugated seamless shell (1) are composed of many small peaks and valleys of the same size, and the longitudinal corrugations are composed of tangent large peaks and valleys.

5. According to claim 4, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The thickness of the one-piece three-dimensional corrugated seamless shell (1) varies, and has a non-uniform thickness in the longitudinal direction of the ring.

6. According to claim 5, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The one-piece three-dimensional corrugated seamless shell (1) is a whole body that can directly contact the fluid, and the transducer can be sealed without potting or with watertight potting in a few places.

7. The novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell according to claim 6 is characterized by: The one-piece three-dimensional corrugated seamless shell (1) is made of titanium alloy material and is manufactured using metal 3D printing, and its appearance and internal structure present a multi-dimensional complex curved surface.

8. According to claim 1, the novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The piezoelectric ceramic annular stack (3) is made of PZT4 material, and each piezoelectric ceramic annular piece is bonded with epoxy resin.

9. According to claim 1, the novel barrel-plate type flextensional transducer with special-shaped curved surface and complex shell is characterized by: The gasket (4) is made of titanium alloy material, the outer diameter of the gasket (4) is the same as the outer diameter of the piezoelectric ceramic ring stack (3), and the inner diameter is slightly smaller than the inner diameter of the piezoelectric ceramic ring stack (3).

10. The novel barrel plate type flextensional transducer with special-shaped curved surface and complex shell according to claim 1 is characterized in that: The cover plate (2) is made of titanium alloy material, and its outer structure is a T-shaped frustum.

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