![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
6. Noise level (NL) and directivity index (DI)
For ASDIC, the position and mounting of the base on these small, noisy boats probably resulted in a high level of self-noise (SN) even at medium speed (10 knots), hence our choice of a level equivalent to sea 6 (figure
10
from
Although American shipyards have undoubtedly mastered BP, the US Navy's HMS, at more than 25 knots, can't avoid being confronted...
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Noise level (NL) and directivity index (DI)
Bibliography
Asset versus liability references (section 1)
Software tools
COMSOL Multiphysics ® Universal platform for physics simulation : https://www.comsol.fr/comsol-multiphysics
Websites
Discovery Sound In The Sea, a site linked to the University of Rhode Island, near the large NUWC Newport laboratory (Naval Undersea Warfare Center): http://www.dosits.org/
Site listing Russian submarines and their news: http://www.soumarsov.eu/
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