Multi-point driving amplitude-phase control bending plate low-frequency transducer

Abstract

The invention provides a multi-point driving amplitude-phase control bending plate low-frequency transducer. The multi-point driving amplitude-phase control bending plate low-frequency transducer comprises a radiation plate, a driving vibrator and a wedge. The radiation plate comprises a radiation flat plate, a vertical block and a vertical wedge. The plurality of vertical wedges and the plurality of vertical blocks are opposite in pairs and are fixed on one side of the radiation flat plate. And the driving vibrator is made of an elastic material. One end of each driving vibrator is rigidly connected with the vertical block, a wedge is inserted between the other end of each driving vibrator and the vertical wedge, and the wedge and the vertical wedge are fixed through bolts. And each vertical block and the wedge compress and clamp the driving vibrator. Two or more groups of driving vibrators are matched with multi-point driving active amplitude and phase control to excite multiple vibration modes of the bending plate transducer and a vibration mode combined by the multiple vibration modes, so that efficient sound radiation of the bending plate transducer is realized, and the bending plate transducer can be applied to the fields of ultra-long-distance underwater acoustic detection, underwater acoustic communication and the like.

Description

Technical Field

[0001] This application belongs to the field of underwater acoustic transducers, and particularly relates to a multi-point driven amplitude-phase control curved plate low-frequency transducer. Background Art

[0002] As the only information carrier that can currently propagate over long distances in the ocean, the propagation distance of sound waves changes with frequency. Low-frequency and ultra-low-frequency sound waves have small absorption losses and long propagation distances in seawater. Therefore, in the technical fields of ultra-long-distance underwater acoustic detection, underwater acoustic countermeasure, and underwater acoustic communication, low-frequency and ultra-low-frequency underwater acoustic transducers are urgently needed.

[0003] Limited by the contradiction between the large structural size of low-frequency underwater acoustic transducers and the limited installation space of application platforms, low-frequency and small-sized underwater acoustic transducers have become a research hotspot. The more typical low-frequency transducers mainly include flextensional transducers, flexural disk transducers, Helmholtz transducers, overflow ring transducers, and electrodynamic transducers: Flextensional transducers and flexural disk transducers use flexural vibrations with relatively low resonance frequencies to achieve low-frequency emission; Helmholtz transducers and overflow ring transducers use liquid cavity vibrations with relatively low resonance frequencies to achieve low-frequency emission. The resonance frequency of electrodynamic transducers does not depend on the overall size of the transducer, but is related to the mass of the movable parts of the vibration system and the stiffness of the suspension spring. Therefore, by using a very flexible spring, the resonance frequency of the electrodynamic transducer can be set in the ultra-low-frequency band below 100 Hz.

[0004] Among them, the working bandwidth of flextensional transducers is not wide enough, which limits their use in some application scenarios with high bandwidth requirements; when the working frequency reaches an octave, the spatial distribution of acoustic radiation energy often has obvious directivity, making it difficult to achieve a uniform sound field distribution in the whole space; and its working performance changes sensitively with the underwater working depth, and additional adjustments or compensations may be required at different depths.

[0005] Flexural disk transducers have weak hydrostatic pressure resistance. Especially when the working frequency drops to the order of several hundred hertz, the maximum working water depth decreases sharply. If a large working water depth is to be maintained at low frequencies, the volume and weight will increase significantly, thus losing the advantage of low-frequency and small-sized emission.

[0006] For Helmholtz transducers, there is a large difference in the transmission voltage between the transducer radiation head and the circumferential radiation ports of the cylinder, with obvious directivity. When using the circumferential radiation ports of the cylinder for horizontal omnidirectional emission, the sound source level is relatively low; while when using the radiation head direction for emission, affected by factors such as wind and waves in the water and underwater ocean currents, the attitude change of the deployed transducer will bring inconvenience to testing and use.

[0007] The process of the overflow ring transducer is complex and usually involves the mosaic process, which has problems such as complex process, difficult to ensure consistency, and difficult to repair. Although it has advantages in small volume and hydrostatic pressure resistance, there may be certain limitations in achieving extremely low frequencies, or a larger size may be required to achieve lower frequencies.

[0008] For the electrodynamic transducer, its working depth is limited. Generally, an active or passive pressure compensation device is required to balance the pressure between the air chamber and the outside. Its working depth is generally within 200 meters. When increasing the airbag volume to increase the working depth, it will be difficult for the electrodynamic transducer to adapt to small underwater platforms, restricting its application range. When using an active compensation method such as high-pressure gas cylinder compensation, there are problems with poor compensation accuracy, and to achieve the recycling of the gas source, the volume, weight, and power consumption of the entire device are all consumed relatively large. Summary of the Invention

[0009] In order to overcome the defects of existing transducers, the present application proposes a multi-point drive amplitude-phase control bending plate low-frequency transducer, and the transducer includes:

[0010] A radiation plate, including a radiation flat plate, a vertical wedge, and a vertical block; wherein,

[0011] The radiation flat plate is a flat plate structure;

[0012] The vertical wedge is a flat plate with a right trapezoidal longitudinal section;

[0013] The vertical block is a rectangular flat plate;

[0014] A plurality of the vertical wedges and vertical blocks are relatively fixed in pairs on one side of the radiation flat plate; the inclined surface side of the vertical wedge faces the vertical block, and the thickness of the end close to the radiation flat plate is thicker;

[0015] Several driving oscillators, including two cylindrical oscillators; the oscillators are made of elastic materials; the number of the driving oscillators, vertical blocks, and vertical wedges is the same;

[0016] A wedge, which is a flat plate with a right trapezoidal longitudinal section;

[0017] One end of each driving oscillator is rigidly connected to the vertical block, and the other end is inserted with the wedge between the vertical wedge; when the wedge is inserted, the thinner end is inserted towards the radiation flat plate, and its inclined surface is adjacent to the inclined surface of the vertical wedge, and the wedge and the vertical wedge are fixed with bolts; each vertical block and the wedge compress and clamp the driving oscillator.

[0018] As an improvement of the above transducer, the length of the driving oscillator is adjustable.

[0019] As an improvement of the above transducer, the driving oscillator is a rare earth type driving oscillator and / or a piezoelectric crystal stack type driving oscillator.

[0020] As an improvement to the above transducer, the oscillator of the rare-earth type driving oscillator is cylindrical and made of rare-earth giant magnetostrictive material; a metal coil is wound around the outside of the oscillator; two plate-shaped magnetic conduction blocks and the two oscillators form a closed magnetic circuit with a mouth-shaped structure.

[0021] As an improvement to the above transducer, the oscillator of the piezoelectric crystal stack type driving oscillator is a columnar piezoelectric crystal stack column; the piezoelectric crystal stack is bonded by N piezoelectric ceramic sheets, where N is an even number greater than or equal to 2; the piezoelectric ceramic sheets are polarized in the thickness direction; an electrode sheet is placed between every two of the piezoelectric ceramic sheets.

[0022] As an improvement to the above transducer, the piezoelectric ceramic sheet is polygonal, circular or elliptical.

[0023] As an improvement to the above transducer, the radiation flat plate is polygonal or has a curved edge, and the thickness is of equal thickness or variable thickness.

[0024] As an improvement to the above transducer, the amplitude-phase control is that the driving voltage amplitude of the driving oscillators located at different parts of the radiation flat plate is continuously adjustable.

[0025] As an improvement to the above transducer, the amplitude-phase control is that the phase difference of the driving voltages of the driving oscillators located at different parts of the radiation flat plate is continuously adjustable within the range of 0° to 180°.

[0026] Compared with the prior art, the advantages of the present application are as follows:

[0027] The present application uses two or more groups of driving oscillators in combination with multi-point driving amplitude-phase control to excite various vibration modes and vibration mode combinations of the flexural plate transducer, so as to achieve efficient acoustic radiation of the flexural plate transducer, and can be applied to fields such as ultra-long-distance underwater acoustic detection and underwater acoustic communication. Description of the Drawings

[0028] Figure 1(a) shows a schematic diagram of the principle of realizing flexural vibration in the present application;

[0029] Figure 1(b) shows a schematic diagram of the principle of multi-point driving amplitude-phase control in the present application

[0030] Figure 2(a) shows a vibration mode diagram of multi-point driving amplitude-phase control in the present application;

[0031] Figure 2(b) shows a schematic diagram of stress analysis of multi-point driving without amplitude-phase control;

[0032] Figure 2(c) shows a vibration mode diagram of the flexural plate transducer under the condition of non-amplitude-phase control;

[0033] Figure 3The figure shows a schematic diagram of the structure of a multi-point drive amplitude-phase control flexural plate low-frequency transducer for driving a rectangular flat plate with 5 groups of rare-earth magnetostrictive material-driven oscillators;

[0034] Figure 4 The figure shows a schematic diagram of the structure of 1 group of rare-earth magnetostrictive material-driven oscillators;

[0035] Figure 5 The figure shows a schematic diagram of the structure of a multi-point drive amplitude-phase control flexural plate low-frequency transducer for driving a rectangular flat plate with 5 groups of piezoelectric stack-driven oscillators;

[0036] Figure 6 The figure shows a schematic diagram of the structure of 1 group of piezoelectric stack-driven oscillators;

[0037] Figure 7 The figure shows a schematic diagram of the structure of a multi-point drive amplitude-phase control flexural plate low-frequency transducer for driving a circular flat plate with 8 groups of driving oscillators;

[0038] Figure 8 The figure shows a test chart of the response curve of a multi-point drive amplitude-phase control flexural plate low-frequency transducer for driving a rectangular flat plate with 5 groups of rare-earth magnetostrictive material-driven oscillators;

[0039] Figure 9 The figure shows a multi-layer ring-shaped polygon high-power sound source composed of multi-point drive amplitude-phase control flexural plate low-frequency transducers;

[0040] Figure 10 The figure shows a vertical-assembled cylinder-shaped polygon high-power sound source composed of multi-point drive amplitude-phase control flexural plate low-frequency transducers.

[0041] Reference numerals:

[0042] 1 - Radiation flat plate, 2 - Oscillator, 3 - Wedge, 4 - Piezoelectric stack, 11 - Vertical block, 12 - Vertical wedge, 21 - Magnetic conduction block, 22 - Rare-earth giant magnetostrictive rod, 23 - Coil holder, 41 - Electrode plate, 42 - Piezoelectric ceramic plate Specific implementation manners

[0043] The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

[0044] Compared with other active materials, the rare-earth giant magnetostrictive material Terfenol-D has the characteristics of large strain of magnetostrictive effect, high energy density, and low sound velocity. Therefore, for an underwater acoustic transducer using Terfenol-D material as the driving material, under the condition of the same volume, its resonance frequency is 30% - 50% lower than that of a piezoelectric ceramic underwater acoustic transducer with the same structural size, and the radiated acoustic power can be 5 - 10 times higher than that of a piezoelectric ceramic underwater acoustic transducer. Therefore, the present application uses rare-earth giant magnetostrictive materials for the design of the transducer.

[0045] The present application provides a multi-point driven amplitude-phase controlled flexural plate low-frequency transducer. Based on the characteristic that the flexural vibration frequency of a large-size plate structure is low, a plate structure is selected as the radiation surface of the transducer. Multiple groups of driving oscillators are distributed at different positions on the radiation surface, forming a flexural plate transducer. An alternating current load is applied to the driving oscillators to cause them to generate longitudinal telescopic vibration, which is transmitted to the radiation plate through the upright block and upright wedge structures, realizing the flexural vibration of the radiation plate. By controlling the driving voltage amplitude and phase of multiple groups of driving oscillators, various vibration modes and vibration mode combinations of the flexural plate transducer are excited, achieving efficient acoustic radiation of the flexural plate transducer.

[0046] Embodiment 1

[0047] A multi-point driven amplitude-phase controlled flexural plate low-frequency transducer includes a radiation plate, driving oscillators, and a wedge 3.

[0048] Among them, the radiation plate includes a radiation flat plate 1, an upright wedge 12, and an upright block 11.

[0049] The radiation flat plate 1 can be a polygonal thin plate such as a rectangular flat plate or a hexagonal thin plate, or a thin plate with a curved edge such as a circular thin plate or an elliptical thin plate. The radiation flat plate 1 can adopt a design with equal thickness or variable thickness.

[0050] The upright wedge 12 and the upright block 11 are connected to the radiation flat plate 1 in pairs through screws of the same material and welded, and are fixed on the non-radiating surface side of the radiation flat plate 1.

[0051] The upright block 11 is a cuboid flat plate. The upright wedge 12 is a flat plate with a right trapezoidal longitudinal section, thick at the end close to the radiation flat plate 1 and gradually thinning in the direction away from the radiation flat plate 1. The wedge 3 is a flat plate with a right trapezoidal longitudinal section.

[0052] M (M≥2) driving oscillators are distributed at multiple points in the central area and the edge area on the non-radiating surface side of the radiation flat plate 1. Each driving oscillator includes 2 oscillators 2. The length of each group of oscillators 2 in the driving oscillator is adjustable.

[0053] The oscillator 2 is a cylindrical structure and can be made of a rare earth giant magnetostrictive material. A dynamic driving coil is arranged outside the rare earth cylinder to provide a driving magnetic field. The total length of the oscillator 2 is greater than the distance between the corresponding upright block 11 and the wedge 3 after the oscillator 2 is inserted into the wedge 3.

[0054] The oscillator 2 can be a piezoelectric crystal stack. The piezoelectric crystal stack is bonded by N rectangular piezoelectric ceramic sheets 42, where N is an even number ≥2. The polygonal piezoelectric ceramic sheets 42 are polarized in the thickness direction, and an electrode sheet 41 is placed between every two piezoelectric ceramic sheets 42. The total length of the piezoelectric crystal stack is greater than the distance between the corresponding upright block 11 and the wedge 3 after the piezoelectric crystal stack is inserted into the wedge 3.

[0055] The driving oscillator may also include M1 groups of rare-earth giant magnetostrictive rod driving oscillators and M2 groups of piezoelectric stacks (where M1 + M2 = M).

[0056] One end of each oscillator 2 is directly and rigidly connected to the vertical block 11, and the other end is pressed against the wedge 3. The wedge 3 is rigidly connected to the vertical wedge 12. Inserting the wedge 3 between the oscillator 2 and the vertical wedge 12 can provide prestress for the oscillator 2. The wedge 3 inserted into the vertical wedge 12 forms a plane perpendicular to the radiation plate 1, and the wedge 3 and the vertical wedge are fixed by bolts. The wedge 3 is installed while assembling the driving oscillator. A threaded hole is reserved at the top of the vertical wedge 12, and a through hole is reserved at one end of the wedge 3 that cooperates with the vertical wedge 12. In the initial state, only a limited length of the wedge 3 can be inserted between the oscillator 2 and the vertical wedge 12; by gradually applying force through bolts, the inserted length of the wedge 3 gradually increases until it is fully inserted. Amplitude-phase control means that the driving voltage amplitude of each driving oscillator located at different parts of the radiation plate is continuously adjustable, and the phase difference of the driving voltages of each driving oscillator located at different parts of the radiation plate can be arbitrarily adjusted within the range of 0° to 180°.

[0057] As shown in Figure 1(a), the surface of the radiation plate on the side far from the driving oscillator is defined as surface A, and the surface of the radiation plate on the side close to the driving oscillator is defined as surface B. When the driving oscillator performs a contraction vibration, below the neutral plane of the radiation plate, that is, surface B vibrates in contraction with the driving oscillator, and above the neutral plane, that is, surface A vibrates in tension, and the entire radiation plate realizes a bending vibration. The driving voltage of the driving oscillator is V0cos(θ), where V0 is the driving voltage amplitude and θ is the driving voltage phase.

[0058] The present invention uses a longitudinal vibration driving oscillator. When the driving oscillator performs a contraction vibration, the side of the radiation plate 1 adjacent to the driving oscillator vibrates in contraction, and the side far from the driving oscillator vibrates in extension. Conversely, when the driving oscillator performs an extension vibration, the side of the radiation plate 1 adjacent to the driving oscillator vibrates in extension, and the side far from the driving oscillator vibrates in contraction, thereby realizing the bending vibration of the radiation plate 1.

[0059] As shown in Figure 1(b), when using 1 group of driving oscillators to drive the radiation plate 1, when the size of the radiation plate 1 is too large, the size of the driving oscillator needs to be increased accordingly, but the actual size of the driving oscillator is limited. The multi-point driving method can reduce the requirements for the size of the driving oscillator; secondly, to achieve low-frequency broadband emission, it is necessary to excite multiple modes for multi-mode coupling. It is difficult to excite high-order modes by only 1 group of driving oscillators to drive the radiation plate 1, and the multi-point driving method is convenient for exciting high-order modes.

[0060] As Figure 2(a)-Figure 2(c)As shown, it is the stress analysis schematic diagram and vibration mode diagram of the present invention. Figure 2(b) is the stress analysis schematic diagram of the bending plate transducer under multi-point drive amplitude-phase control. If the driving oscillator includes 3 groups of driving oscillators, where 1 group of driving oscillators drives the main radiation part of the radiation plate 1 (the central area in the length direction of the radiation plate 1), and the remaining 2 groups of driving oscillators respectively drive the secondary radiation parts of the radiation plate 1 (the edge areas in the length direction of the radiation plate 1): (1) If the 1# driving oscillator and the 2# driving oscillator vibrate out of phase; (2) When the 1# driving oscillator contracts and the 2# driving oscillator stretches, the B surface of the main radiation part performs a contraction vibration, the A surface performs a stretching vibration, the B surface of the secondary radiation part performs a stretching vibration, and the A surface performs a contraction vibration; (3) For the part between the main radiation and the secondary radiation, the external force directions applied by the two groups of driving oscillators are the same, and the stress acting on the cross-section is continuous; (4) The bending vibrations of the main radiation part and the secondary radiation part promote each other, causing the amplitude of the entire radiation plate to increase; (5) For the second-order vibration mode of the rectangular thin plate, its main radiation part and secondary radiation part perform out-of-phase bending vibrations, and the three groups of driving oscillators are excited out of phase, which is beneficial to the excitation of its second-order vibration mode.

[0061] Figure 2(a) is the vibration mode diagram of the bending plate transducer under multi-point drive amplitude-phase control: It includes 5 groups of driving oscillators, where 3 groups of driving oscillators are equipped in the main radiation part, and 1 group of driving oscillators is respectively equipped in the secondary radiation parts. When the driving oscillators in the main radiation part all contract in phase, the driving oscillators in the secondary radiation part are out of phase with them and perform a stretching vibration. The vibrations between the various parts of the radiation plate 1 are continuous, and the entire radiation plate 1 performs a bending vibration, with the maximum vibration velocity amplitude in the main radiation part.

[0062] Rather than under amplitude-phase control, its stress analysis schematic diagram and vibration mode diagram refer to Figure 2(b): (1) If the 3 groups of driving oscillators vibrate in phase, when the 3 groups of driving oscillators contract simultaneously, the 3 parts of the B surface of the radiation plate all perform a contraction vibration, and the 3 parts of the A surface of the radiation plate all perform a stretching vibration; (2) For the part between the main radiation and the secondary radiation, the external force directions applied by the two groups of driving oscillators are opposite, and the stress acting on the cross-section is offset, resulting in a reduced amplitude; (3) The bending vibrations of the main radiation part and the secondary radiation part inhibit each other, causing the amplitude of the entire radiation plate to decrease; (4) For the second-order vibration mode of the rectangular thin plate, its main radiation part and secondary radiation part perform out-of-phase bending vibrations, and the three groups of driving oscillators are all in phase, which is not conducive to the excitation of its second-order vibration mode.

[0063] Figure 2(c) is the vibration mode diagram of the bending plate transducer under non-amplitude-phase control: When all the driving oscillators contract in phase, the entire radiation plate is divided into 5 parts and performs bending vibrations respectively, with nodes between the parts, and the maximum vibration velocity amplitude decreases.

[0064] Embodiment 2

[0065] As Figure 3 andFigure 4 As shown in the figure, the oscillator 2 in this embodiment is made of a rare earth giant magnetostrictive material rod 22. The dynamic drive coil is wound around a coil bobbin 23 and disposed outside the rare earth rod 22. Two single-rod oscillators 2 are mechanically paralleled through two magnetic conduction blocks 21 to form a closed magnetic circuit with a mouth-shaped structure. An alternating current load is applied to the two groups of coils of the drive oscillator. The two groups of rare earth rods elongate or shorten at the same frequency, and through mechanical coupling with the vertical block 11 and the wedge 3, the bending vibration of the radiation plate 1 is excited.

[0066] In this embodiment, there are a total of 5 groups of drive oscillators. The total length of the oscillator 2 is greater than the distance between the corresponding vertical block 11 and the wedge 3 after the wedge 3 is inserted. One end of the oscillator 2 is rigidly connected to the vertical block 11, and the other end is adjacent to the vertical wedge 12. The wedge 3 is inserted between the oscillator 2 and the vertical wedge 12 and is rigidly connected to the oscillator 2.

[0067] In this embodiment, the 5 groups of drive oscillators are sorted from left to right in sequence. The amplitudes of the drive voltages are all V0, and the phases are 180°, 0°, 0°, 0°, and 180° respectively.

[0068] In this embodiment, the radiation plate adopts an equal-thickness design and is a rectangular thin plate processed from a titanium alloy material. The wedge 3, the vertical wedge 12, and the vertical block 11 are processed from a titanium alloy material, stainless steel, aluminum alloy, glass fiber, or carbon fiber material.

[0069] The multi-point drive amplitude-phase control bending plate low-frequency transducer in this embodiment can adopt an overflow structure in addition to the air backing type.

[0070] Embodiment 3

[0071] As Figure 5 and Figure 6 shown, the drive oscillator in this embodiment is a piezoelectric crystal stack 4. The piezoelectric crystal stack 4 is bonded by N circular piezoelectric ceramic sheets 42, where N is an even number ≥ 2. The circular piezoelectric ceramic sheets 42 are polarized in the thickness direction. An electrode sheet 41 is placed between every two piezoelectric ceramic sheets 42 for welding leads. The electrode sheet 41 is made of a phosphor bronze material. The piezoelectric ceramic sheets 42 are connected in parallel. The piezoelectric ceramic sheets 42 and the electrode sheets 41 are adhesively bonded one by one with epoxy resin to form a drive element. Each group of drive oscillators includes two piezoelectric crystal stacks. In other embodiments, the piezoelectric ceramic sheets 42 can also be elliptical.

[0072] In this embodiment, in addition to the piezoelectric crystal stack, other ferroelectric materials or antiferroelectric materials can also be used for the drive oscillator.

[0073] In this embodiment, multiple groups of drive oscillators can respectively adopt rods made of rare earth giant magnetostrictive materials and piezoelectric crystal stacks.

[0074] The remaining part of this embodiment is the same as that of Embodiment 1.

[0075] Example 4

[0076] As Figure 7 shown, in this embodiment, the radiation plate 1 is designed with a uniform thickness and is a circular thin plate made of titanium alloy.

[0077] In this embodiment, in addition to the circular rods and piezoelectric crystal stacks made of rare earth giant magnetostrictive materials respectively, the multiple groups of driving oscillators can also be made of other ferroelectric materials or antiferroelectric materials and circular rods made of rare earth giant magnetostrictive materials respectively.

[0078] The rest of this embodiment is the same as that of Embodiment 1.

[0079] As Figure 8 shown, it is the test chart of the main radiation surface direction response curve of the present invention. The solid line represents the response curve corresponding to driving method 2 (the driving voltage amplitudes of 5 groups of driving stacks are all V0, and the phases are all 0°), and the short dash line represents the response curve of the transducer after adopting driving method 1 (the driving voltage amplitudes of 5 groups of driving stacks are all V0, and the phases are 180°, 0°, 0°, 0°, 180° respectively). The test results show that after amplitude-phase control, the response of the transducer corresponding to driving method 1 is improved as a whole compared with driving method 2.

[0080] Example 5

[0081] As Figure 9 shown, taking the present invention as a transducer unit, the long side of the radiation plate 1 is used as the base, surrounded into a polygon along the circumferential direction, and vertically extended along the short side direction of the radiation plate 1 to form a multi-layer ring-shaped polygon high-power sound source.

[0082] Example 6

[0083] As Figure 10 shown, taking the present invention as a transducer unit, the short side of the radiation plate 1 is used as the base, surrounded into a polygon along the circumferential direction to form a vertically assembled cylinder-shaped polygon high-power sound source.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than to limit them. Although the present application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present application does not depart from the spirit and scope of the technical solutions of the present application, and they should all be covered within the scope of the claims of the present application.

Claims

1. A multi-point driven amplitude and phase controlled bending plate low-frequency transducer, characterized in that: The transducer comprises: The radiation panel comprises a radiation flat panel, a vertical wedge and a vertical block; wherein: The radiation plate is a flat plate structure; The vertical wedge is a flat plate with a right-angle trapezoidal longitudinal section; The vertical block is a rectangular flat plate; A plurality of the vertical wedges and vertical blocks are arranged in pairs and are fixed on one side of the radiation plate; the inclined surface of the vertical wedge is opposite to the vertical block, and the thickness of the end close to the radiation plate is relatively thick; A plurality of driving vibrators, including two cylindrical vibrators; the vibrators are made of elastic material; the number of the driving vibrators, the vertical blocks and the vertical wedges is the same; and The wedge is a flat plate with a right-angled trapezoidal longitudinal section; One end of each of the driving vibrators is rigidly connected to the vertical block, and the wedge is inserted between the other end and the vertical wedge; when the wedge is inserted, the thinner end is inserted toward the radiation plate, and its inclined surface is adjacent to the inclined surface of the vertical wedge, and the wedge and the vertical wedge are fixed with bolts; each of the vertical blocks and the wedge compresses and clamps the driving vibrator.

2. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 1, characterized in that: The length of the driving vibrator is adjustable.

3. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 1 or 2, characterized in that: The driving vibrator is a rare earth type driving vibrator and / or a piezoelectric crystal stack type driving vibrator.

4. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 3, characterized in that: The vibrator of the rare earth driving vibrator is cylindrical and made of rare earth giant magnetostrictive material; a metal coil is wound around the outside of the vibrator; two plate-shaped magnetic conductive blocks and the two vibrators form a closed magnetic circuit with a mouth-shaped structure.

5. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 3, characterized in that: The vibrator of the piezoelectric crystal stack type driving vibrator is a columnar piezoelectric crystal stack column; the piezoelectric crystal stack is formed by bonding N piezoelectric ceramic sheets, wherein N is an even number greater than or equal to 2; the piezoelectric ceramic sheets are polarized in the thickness direction; an electrode sheet is arranged between every two piezoelectric ceramic sheets.

6. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 5, characterized in that: The piezoelectric ceramic piece is polygonal, circular or elliptical.

7. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 1, characterized in that: The radiation plate is a polygonal or curved edge plate, and has a uniform thickness or a variable thickness.

8. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 1, characterized in that: The amplitude and phase control means that the driving voltage amplitude of the driving vibrator located at different parts of the radiation plate is continuously adjustable.

9. The multi-point driven amplitude and phase controlled bending plate low-frequency transducer according to claim 8, characterized in that: The amplitude-phase control is that the phase difference of the driving voltage of the driving vibrator located at different parts of the radiation plate is continuously adjustable within the range of 0° to 180°.

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