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http://dx.doi.org/10.7776/ASK.2021.40.4.314

A study on the Lloyd's mirror effect on the underwater radiated noise for the underwater vehicle  

Kang, Seung-Hee (Defense Test & Evaluation Research Institute, Agency for Defense Development)
Publication Information
The Journal of the Acoustical Society of Korea / v.40, no.4, 2021 , pp. 314-319 More about this Journal
Abstract
The measurement of the Underwater Radiated Noise (URN) for the underwater vehicle should consider both the acoustic interference due to the surface reflection and the calculation of the Closet Point of Approach (CPA). In this paper, I tried to analyze the underwater vehicle's URN using the Lloyd's mirror effect. First, the theoretical Lloyd's mirror pattern was compared with the sea trial result, and the sea trial results corresponded well with the theoretical predicted pattern. And then the CPA distance could be estimated by the Lloyd's mirror pattern. As a results, acoustic source level shows the spectral fluctuation due to the acoustic interference of the Lloyd's mirror effect.
Keywords
Underwater Radiated Noise (URN); Spectrum level; Lloyd's mirror effect; Interference pattern;
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