Investigation of the transmission of sound through isotropic, damped material layer(s) bounded by seawater
Roche, Gerald J.
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Acoustic 'windows' are used in SONAR applications to absorb structural loads associated with the platform operation while allowing the passage of acoustic signals. The performance metric commonly used to gauge the acoustic window quality is insertion loss. This thesis provides a derivation of insertion loss for multi-layered materials as a function of frequency and angle of incidence. Derivations are modified to include attenuation of the signals in the material and the result has been written into a MATLAB model. Measurements on single layer plastic, polyurethane and steel panels show good experimental agreement with the theoretical model. The model is then used to predict insertion loss of multiple layers as a tool for improving window bending rigidity.