Airborne Noise Flanking of Shipboard Vibration Isolation Systems

摘要

Theoretical and antidotal results on quiet research vessels indicate that airborne noise flanking of machinery isolation systems adversely affects their underwater radiated signature. This is especially true for diesel-generator drive systems installed on two-stage isolation mounts. Airborne noise from the diesel impinging on the nearby hull and tank structure may become a significant factor of radiating underwater energy. This path and potential methods of minimizing its impact are discussed with respect to two-stage isolation systems. Airborne noise flanking is discussed for systems with open- and closed-bottom intermediate rafts and for a totally enclosed genset.