Abstract
Noise-control problems in boats and small ships are shown to differ from those of other ship classes due to geometrical scaling laws for person occupied spaces, and by high power to displacement ratios common to them. For the fastest boats, noise sources from propeller cavitation, flow, and spray noise have pronounced importance. Obstacles to noise-reduction techniques outlined are sensitivity of boat performance to weight, expected seaway induced acceleration loads, and corrosive effects of salt environment. Criteria for noise control are presented based on ship function: pleasure/work and continuous running/intermittent operation. Examples illustrating the general problem include measured machinery foundation impedance and vibration mount effectiveness, measured transfer functions for structure-borne noise. Examples of noise-control techniques include measured results with lightweight joiner-work partitions, isolation of interior trim from hull shell, and successful use of structural damping materials.
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