Investigation of Alberich Coating to Optimise Acoustic Stealth of Submarines

Due to the nature of their deployment, very few people know location and course a submarine during its time at sea, including only handful ship’s crew. The possibility immediate retaliation by UK her allies is aided submarine’s ability remain undetected SONAR all times. To investigate one method for improving acoustic stealth, finite element model (FEM) was created on ANSYS unit-cell an Alberich coating impeding sound wave representative SONAR. A simplification widely used impedance equation adopted into MATLAB code attain values that were applied in place water loading boundary. Using results given five sets simulations, optimised modelled, containing 26 mm spherical cavity, 40 anechoic layer 30 long steel backplate. This improved stealth submarines displaying greater absorption both ends frequency range, compared with other models used, showing Alberich-style coatings can be improve combat new low-frequency