Multi-cavity low-frequency broadband underwater acoustic transducer
A technology of underwater acoustic transducers and multiple liquid chambers, which is applied in the direction of sound-generating devices and instruments, can solve the problems of narrow liquid cavity resonance bandwidth, high Q value, unfavorable broadband emission, etc., and achieve high electromechanical coupling coefficient, emission efficiency and The effect of high radiated sound power and low resonance frequency
Inactive Publication Date: 2016-03-09
HARBIN ENG UNIV
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Problems solved by technology
The disadvantage is that the Q value is high, and the bandwidth of the liquid cavity resonance is narrow, which is not conducive to the formation of broadband transmission required by underwater acoustic communication and other fields.
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[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] combine figure 2 , the multi-cavity Janus-Helmholtz underwater acoustic transducer provided by the first embodiment of the present invention includes a Janus type composite rod transducer and two cylindrical shells 5; the Janus type composite rod transducer consists of a middle Mass block 1, two piezoelectric crystal stacks 2, two horn-shaped radiation heads 4 and two prestressed bolts 3, each crystal stack is bonded by n pieces (n is an even number ≥ 2) of piezoelectric ceramic discs made. The piezoelectric ceramic discs are polarized along the thickness direction, and electrode sheets can be arranged between every two ceramic discs. The intermediate mass 1 , the piezoelectric crystal stack 2 and the trumpet-shaped radiation head 4 are connected together in sequence, and the piezoelectric crystal stack 2 is prestressed by pressing the prestressed bolt 3 .
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The invention provides a multi-liquid-chamber low-frequency broadband underwater acoustic transducer comprising a Janus composite rod energy transducer composed of an active driver and two horn-shaped radiation heads installed on the two ends of the active driver through prestressing force bolts, and two cylindrical housings. The two cylindrical housings respectively cover a horn-shaped radiation head. The middle part of the cylindrical housings and the Janus composite rod energy transducer form an internal Helmholtz cavity. The out sides of the cylindrical housings and the Janus composite rod energy transducer form two external Helmholtz cavities. The multi-liquid-chamber low-frequency broadband underwater acoustic transducer achieves a broadband transmission effect with the low-frequency fluid resonance of a Helmholtz resonator and the vertical resonance of the Janus energy transducer so as to provide the transducer with the characteristics of low frequency, small size, broad band, larger power, and deepwater operation. The multi-liquid-chamber low-frequency broadband underwater acoustic transducer can be used in fields of low-frequency active sonar, remote underwater acoustic communication, low-frequency underwater acoustic experiments, sea sound chromatography, and seabed landform exploration.
Description
technical field [0001] The invention relates to an underwater acoustic transducer, in particular to an underwater acoustic transducer with multiple liquid cavities. Background technique [0002] Sound waves are the only energy carrier known to man so far that can be transmitted over long distances in seawater. Acoustic methods are the main means of exploring the ocean, developing the ocean, and conducting underwater confrontation. Underwater target detection, positioning, identification, navigation, communication, offshore oil and gas resource exploration, seabed geological and geomorphic imaging, research and measurement of hydrological conditions in sea areas, sound waves and sound wave generators, namely underwater acoustic transducers, all play a pivotal role. [0003] In the application field of underwater acoustic transducers, a single transmitting transducer often cannot meet the requirements of directivity, transmitting sound power and information processing, etc., ...
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IPC IPC(8): G10K9/122
Inventor 桑永杰蓝宇
Owner HARBIN ENG UNIV