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A low-frequency frame-driven quadrilateral flexural transducer

A flextensional transducer and quadrilateral technology, applied to transducers, instruments, and sound-generating devices used underwater to achieve the effects of increasing power capacity, reducing stiffness, and improving sound radiation capabilities

Active Publication Date: 2020-08-07
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Users always hope that the underwater acoustic transducer is small in size and light in weight, and can work at low frequency, high power, and broadband, which poses challenges for the design technology of underwater acoustic transducers

Method used

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  • A low-frequency frame-driven quadrilateral flexural transducer
  • A low-frequency frame-driven quadrilateral flexural transducer
  • A low-frequency frame-driven quadrilateral flexural transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Combine figure 1 As shown, the radiating shell in this embodiment is a symmetrical quadrangular shell, which is formed by alternately connecting four T-shaped end caps 1 and four concave arc-shaped radiating surfaces 2. The driving element of this embodiment is a piezoelectric ceramic crystal stack 6, which is formed by bonding N rectangular piezoelectric ceramic sheets, where N is an even number ≥ 2, and the thickness direction of the rectangular piezoelectric ceramics One electrode sheet is placed between every two piezoelectric ceramic sheets; the driving element and the two transition blocks 5 on both sides thereof form a vibrator assembly, and the length of the vibrator assembly is longer than the corresponding two T-shaped end caps 1 The distance between the inner walls. When assembling the drive unit, by applying thrust from the inside to the outside on the concave arc radiating surface 2, the distance between the inner walls of the two T-shaped end caps 1 at both...

Embodiment 2

[0032] Combine figure 2 As shown, the difference from embodiment 1 is that the driving element in this embodiment adopts the rare earth giant magnetostrictive rod 10, and the coil bobbin 8 is sheathed, and the excitation coil 9 is wound on the coil skeleton 8. A piece of permanent magnet 7 is placed at each end of the rod 10. The rare earth giant magnetostrictive rod 10, the permanent magnet sheet 7 and the transition block 5 constitute a vibrator assembly. The assembly process of the transducer of this embodiment is the same as that of the first embodiment.

[0033] When the transducer is working, the rare earth giant magnetostrictive rod 10 generates magnetostrictive vibration under the combined action of the static bias magnetic field provided by the permanent magnet sheet 7 and the dynamic driving magnetic field generated after the coil 8 is energized, through the T-shaped end cap 1 The structure is mechanically coupled with the quadrilateral shell, so that the concave arc-...

Embodiment 3

[0035] Combine image 3 As shown, the difference from embodiment 1 and embodiment 2 is that the radiation shell in this embodiment adopts an asymmetric quadrilateral shell, consisting of four identical T-shaped end caps 1, and two concave arc-shaped long The radiating surface 3 and the two concave arc-shaped short radiating surfaces 4 are alternately connected.

[0036] The other parts of this embodiment are exactly the same as the first embodiment

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Abstract

The invention provides a low-frequency framework driving type quadrangular flextensional transducer which comprises a radiation shell, driving elements and transition blocks. The radiation shell is a symmetrical quadrangular shell and is formed by alternately connecting four T-shaped end cap structures and four inwards concave arc-shaped radiation surfaces. The T-shaped end cap structures facilitate coupling of the driving elements and the radiation surfaces. The four driving elements are arranged outside the four inward concave arc-shaped radiation surfaces correspondingly, each driving element is in rigid connection with the inner walls of the two T-shaped end caps at the two ends of the corresponding inwards concave arc-shaped radiation surface through the corresponding transition blocks, and the length of each driving element is larger than the distance between the inner walls of the two corresponding T-shaped end caps. The low-frequency framework driving type quadrangular flextensional transducer is small in size, low in frequency, high in power, and capable of achieving various acoustic radiation modes and being applied to underwater acoustic detection, measurement, ocean resource exploration and other fields.

Description

Technical field [0001] The invention relates to a transducer in the field of underwater acoustics, in particular to a low-frequency frame-driven quadrilateral flextensional transducer. Background technique [0002] In technical fields such as remote hydroacoustic communication and marine environment monitoring based on acoustic means, a low-frequency, high-power, broadband hydroacoustic transducer is needed to emit sound waves. Limited by the platform on which the transducer is mounted, the volume and weight of the underwater acoustic transducer are important design parameters. Users always hope that the underwater acoustic transducer is small in size, light in weight, and capable of low frequency, high power, and broadband operation, which poses a challenge to the design of underwater acoustic transducer technology. Low-frequency sound waves mainly refer to sound waves with frequencies below 3kHz, which have very important application values ​​in marine research, resource devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K9/12H04R1/44
CPCG10K9/121H04R1/44
Inventor 蓝宇刘柯寒王秋木
Owner HARBIN ENG UNIV
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