Abstract
In this paper, bubbles are generated by controlling the air inlet volume of the ceramic tube array with a gas divider valve. Stimulation tests of sound attenuation characteristics of the wake of bubbles in a laboratory pool are performed. A measurement experiment of sound attenuation coefficient was carried out in the case of still water and bubbles with different particle sizes. The signal frequency is 20-200kHz. Through experimental research, it is found that the existence of bubbles makes the sound attenuation coefficient significantly larger. And the attenuation coefficient is related to the frequency of the sound waves and the size of the bubbles. At the same frequency, the larger the bubble size , the larger the attenuation coefficient will be. When the bubble size is constant, the attenuation of the acoustic signal in small bubbles will change greatly below 50kHz. Above 50kHz, the attenuation coefficient changes relatively smoothly and the fluctuation is small. In the case of medium and large bubbles, the fluctuation of the attenuation coefficient becomes larger than that in the small bubbles. Finally, the theoretically calculated sound attenuation coefficient is compared with the experimentally measured results. And the change trends of the two results are basically the same.
Highlights
Due to the disturbance of the ship's hull and propeller, a certain wake zone with bubbles and seawater co-existing will be formed on both sides and behind the ship when the ship is sailing
The transmitted signals take the form of singlefrequency and wideband acoustic signals
The sound attenuation coefficient is large at low frequency
Summary
Due to the disturbance of the ship's hull and propeller, a certain wake zone with bubbles and seawater co-existing will be formed on both sides and behind the ship when the ship is sailing. The high-frequency acoustic signals of static water, small bubbles, medium bubbles and large bubbles were measured in the pool respectively. The transducer transmits different frequency signals and uses the hydrophone to receive the acoustic signals.
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