Economical noise control on dutch beam trawlers

The compact design of the modem Dutch fishing cutters, beam trawlers or so-called beamers, with increased machinery and propeller performances stress the need applying arrange of measures to reduce the high noise levels with 5-10 dB(A). So resulting in an economic solution and acoustical acceptable environment of 65-70 dB(A) in the accommodation spaces.For this no radical changes in the design and traditional beamer layout are necessary, but the major reducing treatment should be taken in the receiving compartments (floating floor systems) and in the sound transmission paths (resiliently mounting of machineries). Because there aren't yet noise regulations for fishing vessels, the costs wH play a dominant role in choosing the final noise control packages.A modem new building beamer of 1500 kW(2000 hp) with required noise levels of 65-70dB(A) stands for an extra investment of 1-2 percent of the total cost price. Funher noise reducing implies an excess of costs, radical changes in the design and application of new noise control techniques, (acoustically optimised propeller and aftship hullform or resiliently mounting of complete deckhouses).