Kessissoglou N., Dylejko P.

This paper examines the reduction of the low frequency acoustic signature of a submarine by optimal passive tuning of a resonance changer. The dynamic response of the propeller-shafting system has been modelled as a combination of lumped parameter and continuous parameter systems using the transmission matrix method. The submarine hull was modelled as a ring stiffened finite cylindrical shell submerged in a fluid undergoing axial excitation from the propeller-shafting system. The total sound pressure radiated into the far-field from the hull is obtained by using an approximate closed form solution to the Helmholtz integral equation. Optimal parameters for the resonance changer are obtained by minimising the maximum far-field radiated sound pressure using a genetic algorithm. Using the resonance changer, significant reductions in the radiated noise from a submarine are observed.