Unique Acoustic Characteristics of Ships and Their Control

Ships come in various lengths, widths, and construction materials depending on their intended utilization. Sizes range from small power boats to large aircraft carriers and super tankers. There are many different types of ships and hull features (mono-hull, catamaran, trimaran, etc.), structural construction materials – metal v. composite, joiner/interior materials, main propulsion plants, propulsors (open or ducted, water jet, pump jet, etc.). Most of these factors will have varying impacts on the ship’s acoustical characteristics. Currently, oceanographic, research, cruise, and most military vessels typically require the greatest attention with respect to a quiet design. The selection of the prime propulsion system – diesel direct, diesel geared, gas turbine, diesel-electric, hybrid electric or hydrogen, battery – is usually performed early in the ship’s design. It also has the greatest impact on the level of treatment needed to meet given acoustic goals.