CN111541979A - Magnetostrictive flextensional electroacoustic transducer - Google Patents
Magnetostrictive flextensional electroacoustic transducer Download PDFInfo
- Publication number
- CN111541979A CN111541979A CN202010264367.XA CN202010264367A CN111541979A CN 111541979 A CN111541979 A CN 111541979A CN 202010264367 A CN202010264367 A CN 202010264367A CN 111541979 A CN111541979 A CN 111541979A
- Authority
- CN
- China
- Prior art keywords
- transducer
- magnetostrictive
- conical cylinder
- stressing
- cushion block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R15/00—Magnetostrictive transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention provides a magnetostrictive bending-stretching electroacoustic transducer, which comprises a transducer shell, a magnetostrictive body and a driving coil, wherein the transducer shell comprises a first conical cylinder and a second conical cylinder, one end with larger radius of the first conical cylinder and one end with larger radius of the second conical cylinder are fixedly connected with each other through a rigid connecting part so as to enclose an inner cavity of the transducer shell, and one end and the other end of the magnetostrictive body are respectively and correspondingly abutted against the inner end surface of the first conical cylinder and the inner end surface of the second conical cylinder; the connecting position of the first conical cylinder and the second conical cylinder is also provided with a sealing part, and the sealing part is arranged around the inner cavity of the transducer shell; the device also comprises a prestress module for applying prestress to the magnetostrictors, wherein the prestress direction applied by the prestress module is in the length direction of the transducer.
Description
Technical Field
The invention relates to a low-frequency high-power magnetostrictive flextensional electroacoustic transducer, in particular to a low-frequency high-power giant magnetostrictive electroacoustic transducer device for ocean exploration.
Background
To date, acoustic waves are the only energy carrier known to man that can propagate at great distances in the ocean. As an electroacoustic transducer capable of emitting sound waves, the electroacoustic transducer has very important application value in civil fields such as marine geological landform detection, submarine resource development and the like, and military fields such as submarine detection, underwater acoustic communication and the like.
The acoustic wave is used as a mechanical wave, the attenuation of energy transmitted in water is small (the attenuation rate is one thousandth of the electromagnetic wave), the transmission distance is long, the lower the frequency of the acoustic wave is, the smaller the energy loss caused by the absorption effect in the transmission process is, the transmission range can extend from hundreds of meters to thousands of kilometers, and the acoustic wave is more suitable for applications such as remote underwater detection, communication and navigation. Therefore, the method is particularly important for developing low-frequency high-power transducers. There are many low-frequency electroacoustic transducers, and electromagnetic transducers, giant magnetostrictive transducers, electrodynamic transducers, hydraulic transducers, and the like are common. The giant magnetostrictive flextensional transducer is an ideal low-frequency and high-power sound source, and its working principle is that the longitudinal vibration of giant magnetostrictive material is used to excite the shell body to make bending vibration. The conventional flextensional transducers can be classified into seven categories, I-type, II-type, III-type, IV-type, V-type, VI-type and VII-type, according to their shell shapes. The most widely used is the IV flextensional transducer. The prototype of the type IV flextensional transducer was first introduced in the navy research laboratory in the texas, washington, usa. In 1936, the acoustic department of the patent first proposed a structural form of a bending-stretching transducer (US 2064911A). The IV-type flextensional transducer takes an elliptical stretching shell as a radiation shell, and utilizes the lever principle to realize the amplitude amplification effect, so that larger sound power is radiated, the longitudinal vibration of a vibrator is converted into the bending vibration of the shell, and the resonance frequency of the transducer is reduced. However, the IV flextensional transducer is a tensile shell structure, the radiation area of the transducer is reduced due to the non-radiation surface of the upper and lower cover plates, the shell is an integral structure, the rigidity is high, the resonance frequency is high, and the prestress of the IV flextensional transducer is more that the long axis of the transducer is deformed by stretching the shell, and then the vibrator module is inserted, the restoring force of the shell is used to apply the prestress, which can be released along with the increase of hydrostatic pressure in deep water, so that the vibrator structure of the transducer cannot work in the best prestress state, and the conversion efficiency of the magnetic machine is reduced.
Disclosure of Invention
The invention aims to solve the problems of low power and weak radiation of the traditional low-frequency transducer and provides a low-frequency high-power magnetostrictive flextensional electroacoustic transducer.
In order to solve the technical problems, the invention adopts the technical scheme that: a magnetostrictive bending-stretching electroacoustic transducer comprises a transducer shell, a magnetostrictive structure and a driving coil, wherein the magnetostrictive structure extends in the length direction of the transducer, the driving coil is wound on the magnetostrictive structure, the magnetostrictive structure and the driving coil are both arranged in an inner cavity of the transducer shell, the transducer shell comprises a first conical cylinder and a second conical cylinder which are adjacently arranged in the length direction of the transducer, one ends with larger radius of the first conical cylinder and one ends with larger radius of the second conical cylinder are fixedly connected with each other or movably connected through a hinge through rigid connecting parts so as to enclose the inner cavity of the transducer shell, and one end and the other end of the magnetostrictive structure are respectively and correspondingly abutted against the inner end surface of the first conical cylinder and the inner end surface of the second conical cylinder; the connecting position of the first conical cylinder and the second conical cylinder is also provided with a sealing part, and the sealing part is arranged around the inner cavity of the transducer shell; the magnetostrictive bending-stretching electroacoustic transducer further comprises a prestress module for applying prestress to the magnetostrictive structure, wherein the direction of the prestress is in the length direction of the transducer.
In the invention, under the action of a magnetic field generated by the driving coil with current, the magnetostrictive structure generates longitudinal vibration, so that the transducer shell is driven to generate bending vibration, sound waves are radiated outwards, and electro-acoustic energy conversion is realized. The area of the radiation surface of the transducer shell with the conical structure is increased, and large displacement is generated on the radiation surface of the transducer shell through a triangular amplification effect, so that high-power sound wave emission is realized. Due to the characteristics of magnetostriction, the magnetostrictive structure can work in an optimal state through prestress applied by the prestress module. Moreover, because the direction of the prestress in the application is in the length direction of the transducer, the transducer shell does not need to be stretched, the problem that the prestress is released in deep water along with the increase of hydrostatic pressure due to the fact that the long shaft of the shell is deformed by stretching the shell in the prior art is solved, and the influence on the conversion efficiency of a magnetic machine of the transducer is avoided.
Furthermore, the prestress module is fixedly arranged on the outer wall surface of the transducer shell, and the prestress module abuts against the outer wall surface of the transducer shell in the length direction of the transducer, so that prestress is applied to the magnetostrictive structure through the transducer shell.
In the invention, the prestress module is abutted against the outer wall surface of the transducer shell to apply prestress to the outer wall surface of the transducer shell. One end and the other end of the magnetostrictive structure are respectively and correspondingly abutted against the inner end face of the first conical cylinder and the inner end face of the second conical cylinder, so that the prestress module can apply prestress to the magnetostrictive structure through the transducer shell. Because the prestress module fixedly arranged on the outer wall surface of the shell is abutted to the outer wall surface of the shell in the length direction of the transducer, the influence of hydrostatic pressure on the short shaft direction of the transducer in deep water can be reduced while prestress is provided for the magnetostrictive structure, and the influence on the conversion efficiency of a magnetic machine of the transducer is avoided.
Furthermore, the outer end face of the end with the smaller radius of the first conical cylinder and/or the outer end face of the end with the smaller radius of the second conical cylinder are/is provided with a threaded groove, the pre-stressed module comprises pre-stressed sub-modules the number of which is matched with that of the threaded grooves, each pre-stressed sub-module comprises a pre-stressed rod extending in the length direction of the transducer and a first pre-stressed nut, a disc spring and a second pre-stressed nut which are sequentially arranged on the pre-stressed rod, and the first pre-stressed nut, the second pre-stressed nut and the pre-stressed rod are in threaded connection;
the pre-stressed rod or the first pre-stressed nut has an external thread which is matched with the internal thread of the thread groove.
In the invention, the prestress rod, the disc spring and the prestress nut are matched to apply prestress to the giant magnetostrictive rod, the problem of releasing prestress applied to the bent and stretched shell due to hydrostatic pressure under a deepwater condition can be avoided, and the requirement of deepwater work can be met.
Further, the transducer further comprises a permanent magnet structure for providing a bias magnetic field for the magnetostrictive structure;
by arranging the permanent magnet, a bias magnetic field can be provided, and the frequency doubling effect is prevented.
Furthermore, the permanent magnet structure comprises K +1 permanent magnets with the same magnetization direction in the length direction of the transducer, the magnetostrictive structure comprises K magnetostrictors, and K is more than or equal to 2; in the length direction of the transducer, the permanent magnets and the magnetostrictors are alternately arranged, and the adjacent permanent magnets and magnetostrictors are mutually abutted or fixedly connected;
preferably, the adjacent permanent magnets and magnetostrictors are bonded to each other;
preferably, each permanent magnet and each magnetostrictor are cylinders with the same radius and coaxially arranged;
preferably, a cushion block is arranged between the permanent magnet closest to the inner end face of the first conical cylinder and/or between the permanent magnet closest to the inner end face of the second conical cylinder and the inner end face of the second conical cylinder, and the adjacent permanent magnets are abutted against the cushion block; more preferably, one end of each cushion block, which is close to the permanent magnet, is provided with a containing groove with the same size as the periphery of the permanent magnet.
The magnetostriction body and the permanent magnet are arranged in the same radius, so that the contact surfaces of the magnetostriction body and the permanent magnet are same in size, the magnetostriction body is bonded with the permanent magnet, and grinding between the vibrator and the permanent magnet can be prevented when the transducer works.
Furthermore, a cushion block is arranged between one end of the magnetostrictive structure and the inner end face of the first conical cylinder and/or between the other end of the magnetostrictive structure and the inner end face of the second conical cylinder, and the magnetostrictive structure and the cushion block are mutually abutted;
furthermore, the cushion block arranged between one end of the magnetostrictive structure and the inner end face of the first conical cylinder body is a first cushion block, the cushion block arranged between the other end of the magnetostrictive structure and the inner end face of the second conical cylinder body is a second cushion block, the pre-stress module comprises at least two pre-stress wires which are uniformly arranged around the magnetostrictive structure, each pre-stress wire is arranged between the first cushion block and the second cushion block along the length direction of the transducer, two ends of each pre-stress wire are respectively and correspondingly connected with the first cushion block and the second cushion block, and tension is applied to each pre-stress wire, so that pre-stress is applied to the magnetostrictive structure.
Preferably, the material of the prestressed wire is glass fiber or inconel-X750.
Because the error during processing, the length of magnetostrictive structure probably does not match with transducer housing inner chamber length, through set up the cushion between magnetostrictive structure and transducer housing inner chamber to make magnetostrictive structure can realize through the cushion and the mutual butt between the transducer housing inner end face.
In the invention, the magnetostrictive structure can be compressed in the length direction of the transducer by arranging the prestressed wire, so that the magnetostrictive structure can work in the optimal state. Moreover, the two cushion blocks are close to each other due to the prestress provided by the prestress wire, and the prestress is not applied through the transducer shell, so that the influence of the external hydrostatic pressure applied to the transducer shell in deep water on the magnetostrictive structure can be greatly reduced, and the assembly quality of the transducer is reduced.
Furthermore, a first flange plate is installed at one end with the larger radius of the first conical cylinder, a second flange plate opposite to the first flange plate is installed at one end with the larger radius of the second conical cylinder, and the first flange plate and the second flange plate are fixedly connected through a fastening structure;
the first flange plate, the second flange plate and the fastening structure form the rigid connecting part.
Furthermore, the hinge comprises an annular hinge shaft, at least 2 rotating parts are sleeved on the annular hinge shaft, the rotating parts are uniformly arranged around the center of the annular hinge shaft, and each rotating part comprises a first rotating block fixedly connected with the wall surface of the first conical cylinder and a second rotating block fixedly connected with the wall surface of the second conical cylinder;
preferably, the sealing part comprises watertight rubber arranged on the outer wall surface of the transducer cylinder and a sealing strip arranged at the joint of the watertight rubber and the transducer shell.
According to the invention, the hinge plays a role of connecting the two conical cylinders, and the connection mode reduces the integral rigidity of the transducer and further reduces the resonance frequency of the transducer. And moreover, through the hinge connection, the deformation of the positions of the first conical cylinder body and the second conical cylinder body which are connected with the annular hinge shaft is not uniform, so that the superposition of multiple vibration modes is obtained, and the frequency band of the transducer is widened. The sealing strip and the watertight rubber play a role in waterproof sealing at the joint of the hinge and the outer wall surface of the transducer cylinder.
Further, the inner cavity of the transducer shell is filled with pressure compensation gas or pressure compensation liquid.
The pressure compensation filling gas or liquid is arranged, so that the working water depth of the energy converter can be further improved, and the static pressure in water can be compensated.
The low-frequency high-power magnetostrictive flextensional transducer provided by the invention has a series of advantages:
1) the shell of the conical flextensional transducer has an amplitude amplification effect and low working frequency.
2) The shell of the conical flextensional transducer is of a rotator structure, has a larger radiation area, and increases the volume displacement of the transducer during working, thereby obtaining larger sound radiation power.
3) The hinge-connected conical flextensional transducer reduces the overall rigidity of the transducer, further reduces the resonance frequency of the transducer, and is easy to realize low-frequency high-power emission of an electroacoustic transducer.
4) The surface of the radiation shell can be further provided with a half-depth groove, and the position, the length and the width of the half-depth groove are adjusted to realize multi-mode coupling of different frequencies, so that the frequency band of the transducer is widened.
5) The flextensional transducer of the invention applies prestress by adopting the disc spring or the prestress wire and the cushion block, and can avoid the problem of prestress release under the hydrostatic pressure of the traditional convex transducer, thereby leading the transducer to work in the optimal prestress state.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural view of a magnetostrictive flextensional transducer according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of part A of FIG. 1 without the prestressing module;
FIG. 3 is a schematic diagram of the prestressing module of FIG. 1;
FIG. 4 is a schematic structural view of a magnetostrictive flextensional transducer according to embodiment 2 of the present invention;
FIG. 5 is a partially enlarged schematic view of a hinge according to embodiment 2 of the present invention;
FIG. 6 is a schematic structural view of a magnetostrictive flextensional transducer according to embodiment 3 of the present invention;
FIG. 7 is an enlarged, fragmentary schematic view of the magnetostrictive structure, drive coil, pre-stressed wire, and permanent magnet structure of FIG. 5;
fig. 8 is a schematic perspective view of the magnetostrictive flextensional transducer according to embodiments 2 and 3 of the present invention;
fig. 9 is a schematic perspective view of a magnetostrictive flextensional transducer according to embodiment 4 of the present invention;
FIG. 10 is a schematic view showing a manner of cutting a rod of the magnetostrictive body according to examples 1-4 of the present invention;
fig. 11 is a schematic view showing another manner of cutting a rod of the magnetostrictive according to examples 1-4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Therefore, the invention provides a magnetostrictive flextensional electroacoustic transducer, the shell of which is a conical rotator structure, the radiation area is increased, and the adoption of the hinge connection structure further reduces the resonance frequency of the transducer, the adoption of the disc spring or the prestressed wire for applying the prestress avoids the problem of releasing the prestress when the transducer works in deep water, when an alternating current load is applied to the driving element, the rare earth giant magnetostrictive rod generates longitudinal vibration under the combined action of a static bias magnetic field provided by the permanent magnetic sheets and an alternating magnetic field generated by the alternating current load, the conical shell generates bending vibration through the mechanical coupling of the driving element and the conical flextensional shell, and generates larger displacement on the radiation surface of the shell by utilizing the triangular amplification effect of the conical shell, therefore, low-frequency high-power sound radiation is realized, and the giant magnetostrictive material is high in pressure resistance and can be suitable for deep water work of hundreds of meters.
Example 1
As shown in fig. 1-3, the present invention provides a magnetostrictive flextensional electroacoustic transducer, which utilizes an alternating magnetic field generated by a driving coil 5 which is fed with an alternating current to make a magnetostrictive structure generate longitudinal vibration so as to make a conical shell generate vibration to realize electroacoustic energy conversion, thereby realizing low-frequency high-power performance. The transducer comprises a transducer housing, a magnetostrictive structure extending in the length direction of the transducer, and a drive coil 5 wound around the magnetostrictive structure. The magnetostrictive structure and the driving coil 5 are both arranged in the inner cavity of the transducer shell.
For the sake of a simplified illustration, the first tapered cylinder 1, the second tapered cylinder 2, and the magnetostrictive body 3 in fig. 1 are not shown in cross section, and the first flange 101, the second flange 102, and the fastening structure 18 are not shown in cross section. Whereas the second conical cylinder 2 in figure 2 shows the hatching. The figures and the description are to be read by those skilled in the art.
Magnetostrictive structures are the transducer's vibrator structure. Under the effect of an alternating magnetic field generated by a driving coil, due to the magnetostrictive effect of the magnetostrictive structure, the magnetostrictive structure generates longitudinal (the length direction of the transducer) telescopic vibration in the length direction of the transducer, so that the transducer shell is driven to generate bending vibration and radiate sound waves outwards, the area of a radiation surface of the transducer is increased by adopting the first conical cylinder 1 and the second conical cylinder 2 of the conical structure, and large displacement is generated on the radiation surface of the transducer through the triangular amplification effect, so that high-power sound wave emission is realized. Compared with the traditional magnetostrictive flextensional transducer, the radiating capacity of the transducer is improved.
The transducer housing (i.e., the radiation housing) is a rotator structure. The transducer shell comprises a first conical cylinder body 1 and a second conical cylinder body 2 which are adjacently arranged in the length direction of the transducer, so that the assembly of the vibrator and the driving module is facilitated. The end with the larger radius of the first conical cylinder 1 and the end with the larger radius of the second conical cylinder 2 are fixedly connected with each other through rigid connecting parts, so that an inner cavity of the transducer shell is surrounded. The inner cavity of the transducer shell is a closed space. Under the condition that no external force acts and no current is supplied to the driving coil, the first conical cylinder body 1 and the second conical cylinder body 2 are kept in approximately rigid fixed connection. The openings of the first conical cylinder 1 and the second conical cylinder 2 are oppositely arranged.
The rigid connecting part comprises a first flange plate 101, a second flange plate 102 and a fastening structure 18. The large-radius end of the first conical cylinder body 1 is provided with a first flange plate 101, the large-radius end of the second conical cylinder body 2 is provided with a second flange plate 102 opposite to the first flange plate 101, and the first flange plate 101 and the second flange plate 102 are fixedly connected through a fastening structure 18.
The driving coil is wound by high-temperature enameled wires, and short-time large current can be introduced. When the driving coil 5 is electrified, an alternating current driving magnetic field can be generated. When the driving coil 5 is electrified with current, the magnetostrictive structure vibrates in the length direction of the transducer, so that the first conical cylinder 1 and the second conical cylinder 2 are driven to bend and vibrate in the length direction of the transducer. Namely, the end with larger radius of the first conical barrel body 1 and the end with larger radius of the second conical barrel body 2 are kept relatively fixed, and the end with smaller radius of the first conical barrel body 1 and the end with smaller radius of the second conical barrel body 2 both reciprocate.
The transducer further comprises a permanent magnetic structure for providing a bias magnetic field to the magnetostrictive structure. The permanent magnet structure comprises three permanent magnets 4 having the same magnetization direction in the length direction of the transducer. The permanent magnet 4 provides a bias magnetic field to prevent the frequency doubling effect. The permanent magnet can also be omitted, and a group of direct current coils can be arranged to provide a bias magnetic field, so that the effect of preventing frequency doubling is realized.
In the length direction of the transducer, the permanent magnets 4 and the magnetostrictors 3 are alternately arranged, and the adjacent permanent magnets 4 and magnetostrictors 3 are mutually abutted or fixedly connected. Under the action of alternating current, the giant magnetostrictive rod can generate stretching vibration. The adjacent permanent magnet 4 and magnetostrictors 3 can be bonded by epoxy resin glue, so that grinding between the vibrator and the permanent magnet 4 is prevented when the transducer works. Each of the permanent magnet 4 and the magnetostrictive body 3 may be a cylinder having the same radius and coaxially disposed. In consideration of the processing difficulty, it is preferable that the permanent magnet 4 and the super magnetostrictive body 3 have the same shape and the same size of the contact surface, so that the assembly is easy and the adhesion is convenient.
A first cushion block 61 can be arranged between the permanent magnet 4 closest to the inner end face of the smaller radius end of the first conical cylinder 1 and the inner end face of the first conical cylinder 1, and a second cushion block 62 can be arranged between the permanent magnet 4 closest to the inner end face of the smaller radius end of the second conical cylinder 2 and the inner end face of the second conical cylinder 2.
The magnetostrictive structure may be a magnetostrictive rod. In the present embodiment, the magnetostrictive structure includes two magnetostrictive bodies 3.
One end of the magnetostrictive structure is abutted to the inner end face of the smaller radius end of the first conical cylinder 1 sequentially through the first permanent magnet 4 and the first cushion block 61. The other end of the magnetostrictive structure is abutted to the inner end face of the smaller-radius end of the second conical cylinder 2 through the second permanent magnet 4 and the second cushion block 62 in sequence. One end and the other end of the magnetostrictive structure (namely, between the two magnetostrictive bodies 3) are connected with each other through a third permanent magnet 4.
One end of the first cushion block 61 close to the first permanent magnet 4 can be provided with an accommodating groove with the same peripheral size as the first permanent magnet 4. The first permanent magnet 4 adjacent to the first pad 61 may be disposed in the receiving groove and abut against the bottom of the receiving groove.
One end of the second cushion block 62 close to the second permanent magnet 4 can be provided with a containing groove with the same size as the outer periphery of the second permanent magnet 4. A second permanent magnet 4 adjacent to the second pad 62 may be disposed in the receiving groove and abut the bottom of the receiving groove.
The first cushion block 61, the second cushion block 62 and the inner end face of the transducer shell are not fixed, and can be pressed tightly by mutual abutting of prestress applied by the prestress module.
In the present invention, if the inner end surface of the tapered cylinder is provided with the convex portion extending toward the magnetostrictive body 3, the convex portion surface should also be regarded as the inner end surface of the tapered cylinder.
The transducer further comprises a pre-stressing module for pre-stressing the magnetostrictive structure, the pre-stressing module applying a pre-stressing force in a direction along the length of the transducer.
The prestress module is fixedly arranged on the outer wall surface of the transducer shell and is abutted against the outer wall surface of the transducer shell in the length direction of the transducer, so that prestress is applied to the magnetostrictive structure through the transducer shell. The prestressing force module can be arranged on the outer wall surface or the outer end surface of the end with the smaller radius of the first conical cylinder body 1 and/or the outer wall surface or the outer end surface of the end with the smaller radius of the second conical cylinder body 2.
The prestress applied to the magnetostrictive body 3 by the prestress module is far larger than the interaction force when two ends of the magnetostrictive body 3 are abutted against the inner wall of the transducer shell. In the invention, the pre-stress module can provide 8MPa pre-stress for the magnetostrictors 3 through arrangement.
The outer end face of the smaller-radius end of the first conical cylinder body 1 and/or the outer end face of the smaller-radius end of the second conical cylinder body 2 are/is provided with a threaded groove 103, each pre-stressed sub-module comprises pre-stressed rods 15 extending in the length direction of the transducer and first pre-stressed nuts 171, disc springs 16 and second pre-stressed nuts 172 sequentially mounted on the pre-stressed rods 15, and the first pre-stressed nuts 171, the second pre-stressed nuts 172 and the pre-stressed rods 15 are in threaded connection. In this embodiment, the threaded groove 103 is formed only on the outer end surface of the smaller radius end of the second conical cylinder 2 (i.e., on one end surface of the transducer housing).
The pre-stressing rod 15 or the first pre-stressing nut 171 has an external thread which co-operates with an internal thread of the threaded recess 103.
(1) When the prestressed rod 15 has an external thread which is matched to the internal thread of the threaded recess 103, the prestressed rod 15 is screwed into the threaded recess 103. The first pre-stressed nut 171 abuts against the outer wall surface of the transducer housing at the periphery of the threaded groove 103, and the first pre-stressed nut 171, the disc spring 16 and the second pre-stressed nut 172 act together to apply pre-stress on the magnetostrictive body 3 sequentially through the second conical cylinder 2, the second cushion block 62 and the permanent magnet 4, and the magnetostrictive body 3 abuts against the inner end surface of the smaller-radius end of the first conical cylinder 1 through the permanent magnet 4 and the first cushion block 61.
(2) When the first pre-stress nut 171 has an external thread which is fitted with the internal thread of the threaded groove 103; the prestressed rod 15 and the first prestressed nut 171 are screwed into the threaded groove 103, the first prestressed nut 171 abuts against the bottom of the threaded groove 103, and the first prestressed nut 171, the disc spring 16 and the second prestressed nut 172 act together, so that the magnetostrictive structure is prestressed through the transducer housing. Preferably, when the prestressed bar 15 has an external thread which is matched to the internal thread of the threaded groove 103, the prestressed bar 15 abuts against the bottom of the threaded groove 103.
The prestress rod 15, the disc spring 16, the first prestress nut 171 and the second prestress nut 172 are matched to apply prestress to the giant magnetostrictive rod. The prestress applied by the prestress module is adjusted by changing the number of the disc springs 16 and the series-parallel connection mode.
In the invention, the prestress module is arranged, so that the problem that the prestress applied to the transducer shell is released due to hydrostatic pressure under the deepwater condition can be avoided, and the requirement of deepwater work can be met. Because the prestress module supports against the long shaft below the long shaft direction (the length direction of the transducer), the influence caused by the fact that the long shaft is lengthened and the short shaft is shortened due to hydrostatic pressure compression at the left side and the right side of the short shaft is reduced, and therefore the vibrator structure of the transducer can work in the optimal prestress state.
And a watertight cable joint 11 electrically connected with the driving coil 5 is arranged on the end face of the transducer shell. The watertight cable joint can meet the stable work under the deep sea condition, and is electrically connected with the incoming line and the outgoing line of the driving coil through the conducting wires.
As shown in fig. 10 and 11, the permanent magnet 4 and/or the magnetostrictive body 3 may be subjected to a slitting or slicing process, or both may be subjected to different processes, such as one slitting process and the other slicing process. After the slitting treatment or the slicing treatment, the permanent magnet 4 and/or the magnetostrictor 3 are bonded by the insulating glue 13, so that the overlarge eddy current loss generated by the permanent magnet 4 and/or the magnetostrictor 3 under the action of dynamic alternating current excitation is reduced, and the magnetic-mechanical conversion efficiency of the transducer is improved.
And a sealing part is further arranged at the connecting position of the first conical cylinder body 1 and the second conical cylinder body 2, and the sealing part is arranged around the inner cavity of the transducer shell. Generally, grooves are respectively formed in the inner wall surfaces of the first conical cylinder 1 and the second conical cylinder 2 at the joint of the first conical cylinder 1 and the second conical cylinder 2, O-shaped sealing rings are placed in the grooves, when the two conical cylinders are butted, the O-shaped sealing rings are pressed tightly, and the grooves and the O-shaped sealing rings form sealing parts.
And the inner cavity of the transducer shell is also filled with pressure compensation gas or pressure compensation liquid. The pressure compensating fill gas or liquid serves to further increase the depth of the transducer operating water. When the driving coil is filled with the pressure compensation liquid, the driving coil can be wrapped with a waterproof layer, so that watertight treatment is performed. The pressure compensating liquid may be compressor oil.
The material of the first conical cylinder 1 and the second conical cylinder 2 can be any one of duralumin, stainless steel, aluminum magnesium alloy, titanium alloy, carbon fiber or glass fiber.
The magnetostrictive body 3 may be made of a rare earth giant magnetostrictive material.
The first and second blocks 61, 62 may be made of hard aluminum, soft iron, etc.
When the transducer works, the transducer can be connected with a surface ship through a rope by mounting a lifting ring on a transducer shell and the like.
Example 2
With reference to fig. 4, 5 and 8, in contrast to embodiment 1, the first tapered barrel 1 and the second tapered barrel 2 are connected to each other via a hinge. The two are connected through the hinge, so that the integral rigidity of the shell of the transducer is reduced, the resonance frequency of the transducer is further reduced, and the low-frequency emission of the electroacoustic transducer is easy to realize. Under the condition that no external force acts and no current is supplied to the driving coil, the first conical cylinder body 1 and the second conical cylinder body 2 are kept in approximately rigid fixed connection.
As shown in fig. 5, in the present embodiment, the hinge includes a ring hinge shaft 7, at least 2 rotation portions are sleeved on the ring hinge shaft 7, the rotation portions are uniformly arranged around the center of the ring hinge shaft 7, and each rotation portion includes a first rotation block 71 fixedly connected to the wall surface of the first conical cylinder 1 and a second rotation block 72 fixedly connected to the wall surface of the second conical cylinder 2. If the ring hinge axis 7 is circular as a whole, the center of the circle is the center. The rotating blocks (the first rotating block 71 and the second rotating block 72) can adopt a shape which is matched with the shape of the wall surface of the conical cylinder body (the first conical cylinder body 1 and the second conical cylinder body 2), thereby being convenient for connection and fixation. The rotating block can be made of the same material as the conical cylinder. The rotating block can be in a sheet shape, can be tightly attached to the outer wall surface of the conical cylinder and is fixed with the outer wall surface of the conical cylinder through a fastening element. The conical cylinder body can also be provided with a groove which is used for accommodating the rotating block and is adaptive to the shape of the rotating block, and the rotating block is fixedly connected with the bottom of the groove through a fastening element. The wall surface of the larger radius end of the conical cylinder that is not fixedly connected to the turning block may be disposed adjacent to the ring hinge shaft 7. The joint of the annular hinge shaft 7 and the outer wall surface of the conical cylinder body and the joint of the rotating block and the conical cylinder body can be sealed.
And a sealing part is further arranged at the connecting position of the first conical cylinder body 1 and the second conical cylinder body 2, and the sealing part is arranged around the inner cavity of the transducer shell. The sealing part comprises watertight rubber 9 arranged on the outer wall surface of the transducer cylinder and a sealing strip arranged at the joint of the watertight rubber 9 and the transducer shell. The hinge joint can be subjected to waterproof sealing treatment through a sealing strip and a watertight rubber 9.
The watertight rubber 9 can be any one of nitrile rubber, vulcanized rubber and polyurethane rubber.
The rest of this example is the same as example 1.
For the sake of a brief presentation, only the ring hinge shaft 7 is shown in fig. 4, the first and second rotation blocks 71, 72 are not shown, and the ring hinge shaft 7 is not shown with hatching. As will be appreciated by those skilled in the art.
Example 3
Referring to fig. 6 to 8, the prestressing module according to the present embodiment includes at least two prestressing wires 12 uniformly arranged around the magnetostrictive structure, as compared with embodiment 2. Or 4 pre-stressed wires 12 arranged evenly around the magnetostrictive structure.
The cushion block 6 arranged between one end of the magnetostrictive structure and the inner end face of the first conical cylinder body 1 is a first cushion block 61, the cushion block 6 arranged between the other end of the magnetostrictive structure and the inner end face of the second conical cylinder body 2 is a second cushion block 62, the prestressed module comprises at least two prestressed wires 12 which are uniformly wound on the magnetostrictive structure, each prestressed wire 12 is arranged between the first cushion block 61 and the second cushion block 62 along the length direction of the transducer, and two ends of each prestressed wire 12 are correspondingly connected with the first cushion block 61 and the second cushion block 62 respectively. A tensile force is applied to each of the prestressing wires 12, thereby prestressing the magnetostrictive structure. Each of the prestressing wires 12 is used to provide prestressing for bringing the first block 61 and the second block 62 close to each other, i.e., to tension the prestressing wires 12, thereby tensioning the first block 61 and the second block 62 on both sides, and thereby prestressing the magnetostrictive structure between the first block 61 and the second block 62.
The prestress is applied by the first cushion block 61 and the second cushion block 62 which are matched with a prestress wire. After the assembly of the driving module and the vibrator is completed, the required prestress can be applied through the first cushion block 61 and the second cushion block 62 in cooperation with the prestress wire 12 according to the magnitude of the required prestress. The pre-stress module can be assembled at the long axis center of the first conical cylinder 1 and the second conical cylinder 2. The prestress applying mode can also avoid the problem of releasing prestress applied to the shell due to hydrostatic pressure under the deepwater condition, can meet the requirement of deepwater work, reduces the assembling quality of the transducer, and the rest of the embodiment is the same as the embodiment 2.
The prestressed wire is made of high-strength materials such as glass fiber or inconel-X750 (Inconel alloy).
Example 4
In contrast to embodiment 3, the rigid connection portion in this embodiment includes a first flange 101, a second flange 102, and a fastening structure 18.
In this embodiment, the prestressing force module includes at least two prestressing wires 12 uniformly arranged around the magnetostrictive structure, and the structure and connection of the prestressing wires 12 can be set with reference to embodiment 3. The structure and the connection manner of the rigid connection portion can be set with reference to example 1.
Example 5
Referring to fig. 9, the difference from the embodiments 2 and 3 is that at least one half-depth groove 14 is formed on the outer wall surface or the inner wall surface of the transducer housing in this embodiment. The half-depth groove 14 on the surface of the transducer housing widens the frequency band of the transducer. The number of the half-deep grooves 14, the position on the housing, the groove length and the groove width can be determined by those skilled in the art according to actual needs, so that multi-mode coupling of different frequencies can be realized, and the broadband characteristic of the transducer can be realized. The first conical barrel body 1 and the second conical barrel body 2 are both provided with a half-depth groove 14, the half-depth groove 14 on the first conical barrel body 1 and the half-depth groove 14 on the second conical barrel body 2 are symmetrically distributed by taking a plane where contact positions of the first conical barrel body 1 and the second conical barrel body 2 are located as a symmetry plane. The rest of this example is the same as examples 2 and 3.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading this disclosure, modifications of various equivalent forms of the present invention by those skilled in the art will fall within the scope of the present application, as defined in the appended claims. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Claims (10)
1. A magnetostrictive flextensional electroacoustic transducer comprises a transducer shell, a magnetostrictive structure extending in the length direction of the transducer, and a driving coil (5) wound on the magnetostrictive structure, wherein the magnetostrictive structure and the driving coil (5) are both arranged in an inner cavity of the transducer shell, and is characterized in that the transducer shell comprises a first conical cylinder (1) and a second conical cylinder (2) which are adjacently arranged in the length direction of the transducer, one end of the first conical cylinder (1) with a larger radius and one end of the second conical cylinder (2) with a larger radius are fixedly connected with each other through a rigid connecting part or connected through a hinge so as to enclose the inner cavity of the transducer shell, and two ends of the magnetostrictive structure are respectively and correspondingly abutted against inner end surfaces of the first conical cylinder (1) and the second conical cylinder (2); the connecting position of the first conical cylinder (1) and the second conical cylinder (2) is also provided with a sealing part, and the sealing part is arranged around the inner cavity of the transducer shell; the transducer further comprises a pre-stressing module for pre-stressing the magnetostrictive structure, the pre-stressing module applying a pre-stressing force in a direction along the length of the transducer.
2. The magnetostrictive bender according to claim 1, characterized in that the pre-stressed module is fixedly arranged on the outer wall surface of the transducer housing, and the pre-stressed module abuts against the outer wall surface of the transducer housing in the length direction of the transducer, so as to pre-stress the magnetostrictive structure through the transducer housing.
3. The magnetostrictive bending strain electroacoustic transducer according to claim 2, wherein the outer end surface of the end with the smaller radius of the first conical cylinder (1) and/or the outer end surface of the end with the smaller radius of the second conical cylinder (2) is provided with a threaded groove (103), the pre-stressing modules comprise pre-stressing sub-modules, the number of which is matched with that of the threaded grooves (103), each pre-stressing sub-module comprises a pre-stressing rod (15) extending in the length direction of the transducer, and a first pre-stressing nut (171), a disc spring (16) and a second pre-stressing nut (172) which are sequentially mounted on the pre-stressing rod (15), and the first pre-stressing nut (171), the second pre-stressing nut (172) and the pre-stressing rod (15) are in threaded connection;
the pre-stressing rod (15) or the first pre-stressing nut (171) has an external thread which co-operates with an internal thread of the threaded recess (103).
4. The magnetostrictive flextensional electroacoustic transducer according to claim 1, further comprising a permanent magnetic structure for providing a bias magnetic field for the magnetostrictive structure.
5. The magnetostrictive flextensional electroacoustic transducer according to claim 4, wherein the permanent magnet structure comprises K +1 permanent magnets (4) having the same magnetization direction in the length direction of the transducer, the magnetostrictive structure comprises K magnetostrictors (3), and K is greater than or equal to 2; in the length direction of the transducer, the permanent magnets (4) and the magnetostrictors (3) are alternately arranged, and the adjacent permanent magnets (4) and magnetostrictors (3) are mutually abutted or fixedly connected;
preferably, the adjacent permanent magnets (4) and magnetostrictors (3) are bonded to each other;
preferably, a cushion block (6) is arranged between the permanent magnet (4) closest to the inner end face of the first conical cylinder (1) and/or between the permanent magnet (4) closest to the inner end face of the second conical cylinder (2) and the inner end face of the second conical cylinder (2), and the adjacent permanent magnets (4) and the cushion blocks (6) are mutually abutted; more preferably, one end of each cushion block (6) close to the permanent magnet (4) is provided with a containing groove with the same size as the periphery of the permanent magnet (4).
6. The magnetostrictive flextensional electroacoustic transducer according to claim 1, characterized in that a spacer block (6) is arranged between one end of the magnetostrictive structure and the inner end face of the first conical cylinder (1) and/or between the other end of the magnetostrictive structure and the inner end face of the second conical cylinder (2), and the magnetostrictive structure and the spacer block (6) are abutted against each other.
7. The magnetostrictive bending strain electroacoustic transducer according to claim 6, wherein the cushion block (6) arranged between one end of the magnetostrictive structure and the inner end face of the first conical cylinder (1) is a first cushion block (61), the cushion block (6) arranged between the other end of the magnetostrictive structure and the inner end face of the second conical cylinder (2) is a second cushion block (62), the pre-stressed module comprises at least two pre-stressed wires (12) uniformly arranged around the magnetostrictive structure, each pre-stressed wire (12) is arranged between the first cushion block (61) and the second cushion block (62) along the length direction of the transducer, and two ends of each pre-stressed wire (12) are correspondingly connected with the first cushion block (61) and the second cushion block (62) respectively; applying a pulling force to each pre-stressing wire (12) so as to pre-stress the magnetostrictive structure;
preferably, the material of the prestressed wire is glass fiber or inconel-X750.
8. The magnetostrictive flextensional acoustic transducer according to any one of claims 1-7, wherein a first flange (101) is mounted at the end with larger radius of the first conical cylinder (1), a second flange (102) opposite to the first flange (101) is mounted at the end with larger radius of the second conical cylinder (2), and the first flange (101) and the second flange (102) are fixedly connected by a fastening structure (18);
the first flange plate (101), the second flange plate (102) and the fastening structure (18) form the rigid connecting part.
9. The magnetostrictive bender according to any of the claims 1-7, characterized in that the hinge comprises a ring hinge shaft (7), at least 2 rotating parts are sleeved on the ring hinge shaft (7), each rotating part is evenly arranged around the center of the ring hinge shaft, each rotating part comprises a first rotating block (71) fixedly connected with the wall surface of the first conical cylinder (1) and a second rotating block (72) fixedly connected with the wall surface of the second conical cylinder (2);
preferably, the sealing part comprises watertight rubber (9) arranged on the outer wall surface of the transducer cylinder body and a sealing strip arranged at the joint of the watertight rubber (9) and the transducer shell.
10. The magnetostrictive flextensional electroacoustic transducer according to any of claims 1-7, wherein the internal cavity of the transducer housing is further filled with a pressure compensating gas or a pressure compensating liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010264367.XA CN111541979B (en) | 2020-04-07 | 2020-04-07 | Magnetostrictive flextensional electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010264367.XA CN111541979B (en) | 2020-04-07 | 2020-04-07 | Magnetostrictive flextensional electroacoustic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111541979A true CN111541979A (en) | 2020-08-14 |
| CN111541979B CN111541979B (en) | 2021-07-30 |
Family
ID=71971652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010264367.XA Active CN111541979B (en) | 2020-04-07 | 2020-04-07 | Magnetostrictive flextensional electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111541979B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114939522A (en) * | 2022-04-18 | 2022-08-26 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Pre-stress applying system, method and medium for disc-shaped transducer |
| CN114979913A (en) * | 2022-04-21 | 2022-08-30 | 哈尔滨工程大学 | Broadband magnetostrictive flextensional transducer |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4864548A (en) * | 1986-06-13 | 1989-09-05 | Image Acoustics, Inc. | Flextensional transducer |
| US4901293A (en) * | 1984-12-19 | 1990-02-13 | Martin Marietta | Rare earth flextensional transducer |
| CN2186468Y (en) * | 1993-11-26 | 1994-12-28 | 中国船舶工业总公司第七研究院第七二六研究所 | Rare-earth bend-spread transducer |
| US5508976A (en) * | 1994-12-02 | 1996-04-16 | Loral Defense Systems | Low frequency underwater acoustic transducer |
| CN2394726Y (en) * | 1999-07-22 | 2000-09-06 | 长江水利委员会长江工程地球物理勘测研究院(武汉) | Sound wave transmitting energy convertor in super magnetic striction well |
| CN1458807A (en) * | 2002-05-17 | 2003-11-26 | 陈铮 | Magnetostriction high-fidelity planar speaker |
| US20040079160A1 (en) * | 2000-07-11 | 2004-04-29 | Aston Martin Geoffrey | Pressure transducer |
| CN1670977A (en) * | 2004-03-19 | 2005-09-21 | 索尼株式会社 | Magnetostrictive actuator |
| CN101500186A (en) * | 2008-01-09 | 2009-08-05 | 索尼株式会社 | Loudspeaker apparatus |
| CN102157144A (en) * | 2011-03-29 | 2011-08-17 | 中国船舶重工集团公司第七一五研究所 | Double-piston radiative rare-earth flextensional transducer |
| CN105959889A (en) * | 2016-05-10 | 2016-09-21 | 中国人民解放军军械工程学院 | Bow stretching type giant magnetostrictive audio transduction device |
| CN110841893A (en) * | 2019-11-25 | 2020-02-28 | 清华大学 | Method and device for pre-tightening giant magnetostrictive material transducer |
-
2020
- 2020-04-07 CN CN202010264367.XA patent/CN111541979B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4901293A (en) * | 1984-12-19 | 1990-02-13 | Martin Marietta | Rare earth flextensional transducer |
| US4864548A (en) * | 1986-06-13 | 1989-09-05 | Image Acoustics, Inc. | Flextensional transducer |
| CN2186468Y (en) * | 1993-11-26 | 1994-12-28 | 中国船舶工业总公司第七研究院第七二六研究所 | Rare-earth bend-spread transducer |
| US5508976A (en) * | 1994-12-02 | 1996-04-16 | Loral Defense Systems | Low frequency underwater acoustic transducer |
| CN2394726Y (en) * | 1999-07-22 | 2000-09-06 | 长江水利委员会长江工程地球物理勘测研究院(武汉) | Sound wave transmitting energy convertor in super magnetic striction well |
| US20040079160A1 (en) * | 2000-07-11 | 2004-04-29 | Aston Martin Geoffrey | Pressure transducer |
| CN1458807A (en) * | 2002-05-17 | 2003-11-26 | 陈铮 | Magnetostriction high-fidelity planar speaker |
| CN1670977A (en) * | 2004-03-19 | 2005-09-21 | 索尼株式会社 | Magnetostrictive actuator |
| CN101500186A (en) * | 2008-01-09 | 2009-08-05 | 索尼株式会社 | Loudspeaker apparatus |
| CN102157144A (en) * | 2011-03-29 | 2011-08-17 | 中国船舶重工集团公司第七一五研究所 | Double-piston radiative rare-earth flextensional transducer |
| CN105959889A (en) * | 2016-05-10 | 2016-09-21 | 中国人民解放军军械工程学院 | Bow stretching type giant magnetostrictive audio transduction device |
| CN110841893A (en) * | 2019-11-25 | 2020-02-28 | 清华大学 | Method and device for pre-tightening giant magnetostrictive material transducer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114939522A (en) * | 2022-04-18 | 2022-08-26 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Pre-stress applying system, method and medium for disc-shaped transducer |
| CN114939522B (en) * | 2022-04-18 | 2024-05-07 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Prestress application system, method and medium for disk-shaped transducer |
| CN114979913A (en) * | 2022-04-21 | 2022-08-30 | 哈尔滨工程大学 | Broadband magnetostrictive flextensional transducer |
| CN114979913B (en) * | 2022-04-21 | 2023-06-27 | 哈尔滨工程大学 | Broadband magnetostriction bending transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111541979B (en) | 2021-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101964185B (en) | Ultra-wideband underwater acoustic transducer | |
| US5959939A (en) | Electrodynamic driving means for acoustic emitters | |
| CN111541979B (en) | Magnetostrictive flextensional electroacoustic transducer | |
| JP5387293B2 (en) | Acoustic transducer | |
| CN100561575C (en) | Dish type transmitting transducer | |
| CN102169685A (en) | Small sized deepwater underwater sound energy transducer with low frequency and broad band | |
| EP0758455A1 (en) | Flextensional acoustic source for offshore seismic exploration | |
| CN103646642B (en) | Many sap cavities broad band low frequency underwater acoustic transducer | |
| CN101909230A (en) | Broadband underwater acoustic transducer using composite material of metal, piezoelectric ceramics and polymer | |
| JP2009232056A (en) | Low frequency oscillator, non-directional low frequency underwater acoustic wave receiver using same, and cylindrical radiation type low frequency underwater acoustic receiver | |
| CN108435523B (en) | Water drop type flextensional transducer | |
| US3308423A (en) | Electroacoustic transducer | |
| CN202042175U (en) | Low-frequency broadband small-size deep water underwater acoustic transducer | |
| CN212441930U (en) | Displacement amplification type magnetostrictive transducer | |
| EP0580156B1 (en) | Underwater low-frequency sound producer using a rare earth alloy | |
| CN110580893A (en) | Cascade piezoelectric ceramic underwater acoustic transducer | |
| CN110010113B (en) | Radial radiation jetty-helmholtz underwater acoustic transducer | |
| CN213716497U (en) | Membrane type electromagnetic transducer | |
| CN112911469A (en) | Electromagnetic transducer | |
| CN111659598B (en) | Displacement amplification type magnetostrictive transducer | |
| CN107274877B (en) | Phase inversion type deep sea bending and stretching underwater acoustic transducer | |
| CN110732477B (en) | Spiral sound wave transmitting transducer with vibration transmission rod | |
| CN108777831B (en) | Conformal driving quadrilateral flextensional transducer | |
| CN115884037B (en) | Multi-excitation low-frequency high-power broadband underwater acoustic transducer | |
| CN219943501U (en) | Integrated window type electromagnetic sound wave generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |