CN-121985271-A - Medium-bandwidth live-line acoustic energy transmitting device and design method thereof

CN121985271ACN 121985271 ACN121985271 ACN 121985271ACN-121985271-A

Abstract

The invention discloses an intermediate frequency charged acoustic energy transmitting device and a design method thereof, wherein the intermediate frequency charged acoustic energy transmitting device comprises a magnetostrictive rod and an exciting coil, the magnetostrictive rod generates axial telescopic deformation under the action of an alternating magnetic field, the axial deformation of each driving unit is synthesized at a central output assembly (a central base) through the structural constraint and the force transmission action of a triangular frame, and the axial micro displacement of the magnetostrictive rod is effectively converted into the in-plane vibration or compound vibration output of the central output assembly through the reasonable design of the geometric dimension, the connection mode and the arrangement angle of each driving unit of the triangular frame, so that the force output capacity and the structural stability of a transducer are improved. The invention has compact structure, symmetrical stress, high response speed, and good linearity, and realizes higher sound source level output and wider frequency band with smaller size.

Inventors

GAO BING
GUO PENG
She Yingsen
YAN XU
GONG HEYAN
XU XIUXIAN
Zhao Nengtong
XU QIANMING
HUANG ZHONGSHENG
NING QIAN

Assignees

湖南大学

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. The medium-frequency charged acoustic energy emission device is characterized by comprising a triangular shell (4), wherein a central base (8) is fixed in the middle of the triangular shell (4), three groups of giant magnetostrictive vibrators are clamped and fixed between the triangular shell (4) and the central base (8) through a magnetic conduction base (5), the three groups of giant magnetostrictive vibrators are symmetrically arranged in radiation, alternating-current excitation coils (9) are sleeved outside the giant magnetostrictive vibrators, the excitation coils (9) are electrically connected with watertight heads (10) arranged on the triangular shell (4), cork cushion layers (3) are arranged on the upper side and the lower side of the triangular shell (4), cover plates (1) are covered on the outer sides of the cork cushion layers (3), the triangular shell (4) and the central base (8) are fixed through connecting screw rods (2) respectively, sealing is achieved between the cover plates (1) and the cork cushion layers (3) and the triangular shell (4) through polyurethane sealant, air or silicon oil is filled in a cavity inside the triangular shell (4), and three sides of the giant magnetostrictive vibrators are in a pre-tightening state, and side radiation surfaces (11) are formed on the three sides of the triangular shell (4).
2. The medium-bandwidth charged acoustic energy transmitting apparatus according to claim 1, wherein said giant magnetostrictive vibrators form an included angle of 120 ° with each other.
3. The medium-frequency charged acoustic energy transmitting device according to claim 1, wherein the giant magnetostrictive vibrator is formed by alternately bonding a permanent magnet (6) and a giant magnetostrictive rod (7), and both ends of the giant magnetostrictive vibrator are permanent magnets (6).
4. The medium-frequency charged acoustic energy transmitting device according to claim 3, wherein the giant magnetostrictive vibrator is formed by alternately arranging and pasting 2 giant magnetostrictive bars (7) and 3 permanent magnets (6), the length of the alternating current excitation coil (9) is smaller than that of the giant magnetostrictive vibrator, and the length of the giant magnetostrictive vibrator is 0.1-0.5mm larger than that of an installation space of the giant magnetostrictive vibrator.
5. The medium-frequency charged acoustic energy transmitting device according to claim 4, wherein the diameter of the giant magnetostrictive rod (7) is 20mm, the length of the giant magnetostrictive rod is 55mm, the diameter of the permanent magnet (6) is 20mm, the length of the giant magnetostrictive rod is 10mm, and the surfaces of the giant magnetostrictive rod (7) and the permanent magnet (6) are subjected to lancing treatment.
6. The medium-frequency charged acoustic energy emission device according to claim 3, wherein the magnetic conduction base (5) is made of DT4C electrical pure iron material, the permanent magnet (6) is made of neodymium iron boron material, the giant magnetostrictive rod (7) and the permanent magnet (6) are adhered and fixed by using an adhesive, the adhesive is EPO-TEKH series epoxy resin adhesive, the triangular shell (4) and the central base (8) are made of aluminum alloy, the cover plate (1) is made of titanium alloy, electroplating treatment is carried out on the surface of the cover plate, and the sealant is polyurethane.
7. The medium-frequency charged acoustic energy emitting device according to claim 1, wherein three corners of the triangular housing (4) are rounded, and three side radiation surfaces (11) are concave arcs.
8. The mid-bandwidth live acoustic energy emitting apparatus of claim 1, wherein the mid-bandwidth live acoustic energy emitting apparatus has a size of no more than 450mm x 65mm.
9. A method of designing a mid-band charged acoustic energy emitting device according to any one of claims 1-8, characterized in that the thickness of said side radiating surface (11) is adjusted according to said resonance frequency, whereby the thickness of the side radiating surface (11) is increased when an increase in resonance frequency is required, and whereby the thickness of the side radiating surface (11) is decreased when a decrease in resonance frequency is required.
10. The method for designing an intermediate frequency charged acoustic energy transmitting device according to claim 9, characterized in that the thickness of the magnetically conductive base (5) is adjusted according to the working depth of the intermediate frequency charged acoustic energy transmitting device, so that the pretightening force of the giant magnetostrictive vibrator is adjusted, so that the giant magnetostrictive rod (7) works in the linear region of the magnetostrictive characteristic curve thereof and is at the optimal working point with the maximum slope of the strain-magnetic field intensity curve at the working depth.

Description

Medium-bandwidth live-line acoustic energy transmitting device and design method thereof Technical Field The invention relates to the technical field of electroacoustic transducers, in particular to an intermediate frequency electrified acoustic energy emitting device and a design method thereof. Background The electroacoustic transducer is mainly used in the fields of underwater acoustics, ultrasonic processing, vibration generation and the like, and has the core function of converting electric energy into mechanical vibration or sound wave radiation. Conventional electroacoustic transducers often use piezoelectric ceramics or magnetostrictive materials as driving sources. However, in the middle frequency, especially in the application occasions requiring high energy density and large output force, the piezoelectric transducer often faces the problems of limited material strain, low tensile strength, easy breakage, serious heating under high power and the like, and limits the output capacity and reliability. As a novel intelligent material, the giant magnetostrictive material has the remarkable advantages of large strain value (up to 1000-1500 ppm), high energy density, high response speed, large output force and the like, and is particularly suitable for the design of transducers with medium and high power and high energy density. However, the material has technical challenges in practical application, namely, the material is generally used in a rod-shaped form, the axial expansion deformation amount is large, the material still belongs to the micron level, the direct driving efficiency is limited, the output direction of a single driving unit is single, the complex vibration mode or the large vibration in-plane motion is difficult to realize, and the whole structure of the transducer needs to work under high pretightening force to ensure the material performance, so that higher requirements are provided for the symmetry, the rigidity and the force transmission efficiency of the structure. The existing giant magnetostrictive transducer mostly adopts a single driving mode of longitudinal vibration or a composite structure, or a plurality of driving units are simply stacked in parallel to increase output, but the existing giant magnetostrictive transducer often has complex structure, huge volume and uneven stress, and vibration coupling and phase coordination among different units are difficult, nonlinear distortion is easy to introduce, and the bandwidth and linearity of the transducer are influenced. Therefore, how to efficiently integrate the output forces of a plurality of giant magnetostrictive driving units in a compact space and effectively amplify or convert the tiny axial displacement of the output forces into vibration output in a required form, and meanwhile, maintain the structural rigidity, symmetry and dynamic stability becomes a key technical problem for improving the performance of the transducer. Disclosure of Invention In order to solve the problems, the invention provides an intermediate frequency charged acoustic energy emitting device and a design method thereof. In order to achieve the above purpose, the technical scheme of the invention is as follows: The medium-frequency charged acoustic energy emission device comprises a triangular shell (4), wherein a center base (8) is fixed in the middle of the triangular shell (4), three groups of giant magnetostrictive vibrators are clamped and fixed between the triangular shell (4) and the center base (8) through a magnetic conduction base (5), the three groups of giant magnetostrictive vibrators are arranged in a radiation symmetrical mode, alternating-current excitation coils (9) are sleeved outside the giant magnetostrictive vibrators, the excitation coils (9) are electrically connected with watertight heads (10) mounted on the triangular shell (4), cork cushion layers (3) are arranged on the upper side and the lower side of the triangular shell (4), cover plates (1) are arranged on the outer side and the lower side of the cork cushion layers (3) in a covering mode, the triangular shell (4) and the center base (8) are fixed through connecting screw rods (2) respectively, sealing is achieved between the cover plates (1) and the cork cushion layers (3) and the triangular shell (4) through polyurethane sealant, air or silicone oil is filled in cavities inside the triangular shell (4), and three sides of the giant magnetostrictive vibrators are in a pre-compression state, and side radiation surfaces (11) are formed. Further improved, the giant magnetostrictive vibrators are arranged in pairs to form an included angle of 120 degrees. Further improved, the giant magnetostrictive vibrator is formed by alternately bonding a permanent magnet (6) and a giant magnetostrictive bar (7), and the permanent magnet (6) is arranged at two ends of the giant magnetostrictive vibrator. The giant magnetostrictive vibrator is further improved, the giant magnetost