NOISE AND VIBRATION CONTROL IN WORKBOATS

Although noise and techniques for its control follow the same principles in workboats as in larger vessels, some practical differences exist because (i) many workboats are less than 24.4 m in length and are therefore not covered by the guidelines laid down in the 1979 "Code of Practice for Noise Levels in Ships", (ii) many workboats are manned for short periods only, and (iii) in a workboat it is not possible to locate the sensitive areas very far from the major noise sources. After a brief discussion on these differences, and on units of noise measurement and noise criteria, some noise-level readings obtained from tugs and fishing vessels, showing the need for noise control measures, are tabulated. The sources and transmission of noise, and various means of controlling noises, both at the design stage and in vessels in service, are then briefly described. The sources considered include engine-room machinery, propellers, and ventilation systems. Among the control measures mentioned are noise-absorbent material (for the engine room), resilient mountings for Diesel engines and for transverse thrusters (some problems associated with resilient mountings for main engines and gearboxes are also mentioned), model tests aimed at reducing propeller-induced pressure fluctuations on the hull (and some possibilities alleviating this problem for ships already in service), and "floating" floors and other measures for the accommodation spaces. Order from BSRA as No. 54,937.

• Supplemental Notes:
  • Southampton University, at Ship & Boat's Port and Coastal Services Conference, Brighton, May 1980.
• Corporate Authors:

  Reed (Thomas) Industrial Press Limited

  36/37 Cock Lane, Saracen's Head Building
  London EC1A 9BY,   England 
• Authors:
  • Randell, R
• Publication Date: 1980-11

Media Info

• Features: References;
• Pagination: p. 53
• Serial:
  • Ship and Boat International
  • Volume: 33
  • Publisher: Reed (Thomas) Industrial Press Limited

Subject/Index Terms

• TRT Terms: Cavitation noise; Engine rooms; Machinery; Measurement; Noise; Noise control; Noise sources; Propellers; Tugboats; Vibration
• Uncontrolled Terms: Noise measurement
• Old TRIS Terms: Engine room noise; Machinery noise; Propeller induced vibration
• Subject Areas: Environment; Marine Transportation;

Filing Info

• Accession Number: 00331591
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: May 21 1981 12:00AM