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Low-frequency broadband Helmholtz underwater acoustic transducer

A technology of underwater acoustic transducers and flextensional transducers, which is applied in the direction of sound-generating devices and instruments, can solve problems such as narrow bandwidth, unacceptable weight, and difficulty in realizing broadband transmission, and achieve small-sized low-frequency emission and low resonance frequency Effect

Inactive Publication Date: 2017-09-29
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the longitudinal vibration transducer as an example, the length of the transducer is generally more than 1 meter when the resonant frequency is 1000Hz. This size and the weight it brings are unacceptable in the application of underwater acoustic transducers
[0004] Second, small volume, low frequency and high power transmission are also contradictory
However, the bandwidth of the above two vibration modes is relatively narrow, and it is difficult to achieve broadband emission by using one mode alone

Method used

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  • Low-frequency broadband Helmholtz underwater acoustic transducer
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  • Low-frequency broadband Helmholtz underwater acoustic transducer

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] combine figure 1 As shown, a low-frequency broadband Helmholtz underwater acoustic transducer provided by the first embodiment of the present invention includes a type III flextensional transducer, a watertight cable head 1, an upper cylindrical shell 2, a screw rod 3 and a lower cylindrical shell 4 composition.

[0030] combine figure 2 As shown, each part of the Type III flextensional transducer includes an upper cover plate 5, a mass block 6, a concave cylindrical radiation plate 7, a piezoelectric ceramic stack 8, a prestressed screw 9, a lower mass block 10, and a vibration-isolation rubber ring 11 , bolts 12 and watertight rubber layer 13.

[0031] The structure of this embodiment is a coaxial nesting structure. The upper cylindrical shell 2 and the lower cylindrical shell 4 are respectively arranged at both ends of the type III flextensional transduce...

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Abstract

The invention provides a low-frequency broadband Helmholtz underwater acoustic transducer, and belongs to the technical field of underwater acoustic transducers. The transducer comprises a III flextensional transducer and two rigid cylindrical shells arranged at two ends of the III flextensional transducer, wherein the two cylindrical shells and a concave cylindrical radiant plate of the III flextensional transducer form a Helmholtz resonant cavity. According to the invention, two kinds of low-frequency resonance modes commonly used in the underwater acoustic transducer are utilized, namely, a fluid cavity resonance mode and a bending resonance mode, and broadband transmission can be formed by coupling the two kinds of vibration, so that the transducer is enabled to have the characteristics of small size, low frequency, high power, broadband transmission and the like. The low-frequency broadband Helmholtz underwater acoustic transducer can be applied to the fields of low-frequency active sonar, remote underwater acoustic communication, low-frequency underwater acoustic experiments, marine environment monitoring and the like.

Description

technical field [0001] The invention relates to a transducer in the field of underwater acoustics, in particular to a low-frequency broadband Helmholtz underwater acoustic transducer excited by a type III flexural transducer. Background technique [0002] In the technical fields of long-distance underwater acoustic communication and marine environment monitoring based on acoustic means, a low-frequency, high-power, wide-band underwater acoustic transducer is needed to emit sound waves. Limited by the transducer mounting platform, the volume and weight of the underwater acoustic transducer are very important design parameters. 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. The main challenges stem from the following points: [0003] First, the small size and low-frequency emission are ...

Claims

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Application Information

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IPC IPC(8): G10K9/12G10K9/122
CPCG10K9/121G10K9/122
Inventor 桑永杰蓝宇丁玥文吴彤
Owner HARBIN ENG UNIV
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