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LOW-FREQUENCY BROADBAND SOUND SOURCE FOR UNDERWATER NAVIGATION AND COMMUNICATION
LOW-FREQUENCY BROADBAND SOUND SOURCE FOR UNDERWATER NAVIGATION AND COMMUNICATION
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机译:水下导航与通信的低频宽带声源
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摘要
An underwater sound source includes an acoustical driver, a controller of the acoustical driver, and a resonant tube acoustically coupled to the acoustical driver. The resonant tube has a pair of slotted portions, in which each slotted portion is disposed along the length of the resonant tube at a location corresponding to a node of a harmonic of the resonant tube. The sound system is configured to emit an output signal within a bandwidth defined by a dual resonance characteristic of the resonator tube. The sound source may also include a pair of coaxial tubular sleeves disposed around the resonant tube, each sleeve configured to slidably cover one of the slotted portions, and tune the resonance frequency of the tube over a wide range. At a high frequency end, when slots are uncovered, the frequency response of the resonant tube obtains a dual-resonant form.
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