Modern construction methods, such as the use of steel instead of wood, reductions of hull mass, gas turbines and Diesel engines, and increased propulsive power, have all contributed to increasing the problem of noise on merchant ships. Added to which there is currently no industry-wide agreement on acceptable shipboard noise or on how noise levels are to be defined. A shipbuilder in the U.S. has incorporated noise reduction treatments into the design and construction of six tankers in an attempt to provide better living and working environments for the crew. These include: isolating machinery from structures where practical, utilizing low-noise level equipment, making decks and bulkheads air-tight, and keeping velocities of piping fluid and air ventilation as low as feasible. In addition noise paths are treated with absorption, barrier, and damping materials. The damping material used is an elastomer manufactured by The Soundcoat Co. Inc., known as Dyad. Structural vibration damping is provided on many steel plates with Dyad damping sheets to create the main barrier against structure-borne noise from the engine room where levels can exceed 120 dBA. A diagram of the resultant reduction in noise levels is included. Order from: BSRA as No. 46,874.

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  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Publication Date: 1977-6

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Filing Info

  • Accession Number: 00170147
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 7 1978 12:00AM