Small-size moving-coil ultralow-frequency underwater acoustic transducer

Abstract

The invention provides a small-size moving-coil ultralow-frequency underwater acoustic transducer. The acoustic transducer comprises a magnetic circuit system structure arranged in a watertight shellin the radial direction and a radiation system structure corresponding to the magnetic circuit system structure. When a current passes through a coil, a driving force is generated in a magnetic circuit air gap under the action of a magnetic field, a radiation system is driven to vibrate according to a certain rule, and sound waves are radiated outwards through a radiation plate. The acoustic transducer has the advantages of being small in size, light in weight and convenient to use, has good adaptability, and can achieve ultra-low frequency broadband acoustic emission of 40 Hz to 1 kHz. The acoustic transducer can be used as an acoustic load, is arranged on sonar equipment and an acoustic countermeasure device, and particularly has good adaptability to a small-caliber navigation body; theacoustic transducer can also be used as a universal ultra-low frequency sound source for laboratories and lake and sea tests.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic transducers, in particular to a small-sized dynamic ultra-low frequency underwater acoustic transducer. Background technique [0002] So far, sound waves have been considered the only information carriers capable of traveling long distances in the ocean. The transmission or reception of acoustic wave information can be realized by using the underwater acoustic transducer. The lower the frequency of the acoustic wave, the smaller the propagation loss in water, and the more suitable for long-distance transmission. With the development of acoustic stealth technology, the mid-high frequency part of the radiated noise of underwater vehicles such as submarines has been suppressed below the level of ocean background noise, and the low-frequency and ultra-low frequency parts of radiated noise have become the key factors for detecting underwater vehicles. As one of the key components of underw...

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Problems solved by technology

[0004] The above-mentioned underwater acoustic transducers can all realize ultra-low-frequency acoustic emission, but obviously, the above-mentioned transducers all have shortcomings such as large volume, heavy weight, and inconvenient use.

In particular, limited by the underwater acoustic countermeasure equipment platform, the volume and weight of the ultra-low frequency underwater acoustic transducer used as the acoustic load should not be too large. The above-mentioned transducer obviously cannot be directly applied to the conventional underwater acoustic countermeasure platform. The piezoelectric transducer must achieve ultra-low frequency acoustic emission below 100Hz, and it is difficult to realize the technology

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