Submarine structural and acoustic attenuation

摘要: In this paper, the low frequency vibro-acoustic responses from a submerged hull are attenuated using passive, active, and hybrid control strategies. An analytical model representing simplified physical of submarine is developed, including effects ring-stiffeners, bulkheads, external fluid loading. At frequencies, rotation propeller results in discrete tones at blade passing its harmonics. The fluctuating forces transmitted through propulsion system, resulting excitation vibrational modes, which turn high level structure-borne radiated noise. work tuned vibration absorbers, active control, absorbers used to attenuate breathing bending modes hull. performance absorber compared attenuation achieved passive fully syst...