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Ultralow-frequency flexual-tensional underwater acoustic transducer

An underwater acoustic transducer, bending-tension technology, applied in the direction of sound-generating devices, instruments, etc., can solve the problems of large size and weight, achieve the effect of reducing resonance frequency, increasing volume, and realizing high-power transmission

Inactive Publication Date: 2012-09-19
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lower the operating frequency, the longer the long axis of the transducer is required. Therefore, the flextensional transducer working in the ultra-low frequency band also has the problem of large size and weight

Method used

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  • Ultralow-frequency flexual-tensional underwater acoustic transducer
  • Ultralow-frequency flexual-tensional underwater acoustic transducer
  • Ultralow-frequency flexual-tensional underwater acoustic transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] refer to figure 2 , image 3 , Figure 4 , making an ultra-low frequency flexural acoustic transducer of the present invention, the radiation shell 1 of the underwater acoustic transducer is a cylindrical shell with an elliptical cross-section, which is made of aluminum alloy material. The total length of the ultra-low frequency flexural acoustic transducer in this embodiment is about 320 mm. In this embodiment, three groups of driving units are connected in series in the direction of the minor axis. The driving housing 2 is made of aluminum alloy, and the length of the major axis of the housing is about 170 mm.

[0034] The driving element of this embodiment is made of a rectangular piezoelectric ceramic sheet, and the size of the piezoelectric ceramic sheet is 70mm×20mm×5mm. Every 24 pieces of piezoelectric ceramics are a group of driving elements, and the piezoelectric ceramic stacks are connected in parallel. The wiring is as follows: Figure 4 shown. A thin m...

Embodiment 2

[0041] like Figure 5 As shown, the driving element of the present embodiment adopts a rare earth giant magnetostrictive rod 7, and a bobbin 9 is covered on the outside, and a coil 8 is wound on the bobbin 9, and a piece of permanent magnet is respectively placed at both ends of the rare earth giant magnetostrictive rod 7. 6. The rare-earth giant magnetostrictive rod 7, the permanent magnet piece 6 and the first transition block 4 constitute a vibrator assembly. The transducer assembly process of this embodiment is the same as that of Embodiment 1.

[0042] When the transducer is working, the rare earth giant magnetostrictive rod 7 generates magnetostrictive vibration under the joint action of the static bias magnetic field provided by the permanent magnet piece 6 and the dynamic driving magnetic field generated after the coil 8 is energized, and the magnetostrictive vibration is generated through the driving element and the driving shell. The mechanical coupling of the body...

Embodiment 3

[0045] like Figure 6 As shown, the radiation housing 1 and the driving housing 2 of this embodiment adopt a concave housing design. When assembling the drive unit, by applying tension to the apex of the two concave shells of the drive shell 2, the distance between the inner walls of the two long axes of the drive shell 2 is increased to make it larger than the longitudinal dimension of the vibrator assembly, and the assembly is placed in the drive The pressure is released between the inner walls of the two major axes of the housing 2 , at this time the vibrator assembly is fixed between the inner walls of the two major axes of the drive housing 2 through prestressing, and is rigidly connected to the drive housing 2 . When the transducer is assembled as a whole, by applying tension to the apex of the two concave shells of the radiation housing 1, the distance between the inner walls of the two major axes of the radiation housing 1 is increased to make it larger than the longit...

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PUM

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Abstract

The invention provides an ultralow-frequency flexual-tensional underwater acoustic transducer which comprises a radiating shell, drive shells, drive elements and transition blocks, wherein the radiating shell and the drive shells are cylindrical shells or concave shells with elliptic cross sections; first transition blocks are arranged on the two sides of each drive element to form a vibrator assembly; the size of each vibrator assembly in the length direction thereof is greater than the distance between the inner walls of two long axes of each drive shell, and the vibrator assembly is arranged in each drive shell and rigidly connected with the inner walls of the long axes of each drive shell to form a drive unit; two second transition blocks are rigidly connected to the short axes ends of each drive unit to form a drive unit assembly; and the size of each drive unit assembly in the length direction thereof is greater than the distance between the inner walls of two long axes of the radiating shell, and the drive unit assemblies are arranged in the radiating shell and rigidly connected with the inner walls of the long axes of the radiating shell. The transducer disclosed by the invention is small in size, light in weight and low in frequency and can be applied to the fields of underwater acoustic detection and measurement, ocean resource exploration, and the like.

Description

technical field [0001] The invention relates to an acoustic sensor, in particular to an ultra-low frequency bending-tension underwater acoustic transducer with multiple amplification effects. Background technique [0002] Ultra-low frequency sound waves mainly refer to sound waves with a frequency below 100Hz, which have very important application value in marine research, resource development, military and other fields. Therefore, it is particularly important to develop ultra-low frequency underwater acoustic transducers. [0003] There are many ways to realize the ultra-low frequency sound radiation of underwater acoustic transducers. The common ones are bending vibration transducers, Helmholtz resonators, moving coil transducers, and flexural transducers. [0004] The representative bending vibration transducer is the HX-554 bending vibration ultra-low frequency underwater acoustic transducer used in the Pacific Acoustic Temperature Measurement Program. The transducer m...

Claims

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Application Information

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IPC IPC(8): G10K9/122
Inventor 蓝宇陈思
Owner HARBIN ENG UNIV