COMPARISONS OF SOUND-LEVEL MEASUREMENTS IN SHIPS OF THE SAME TYPE AND SAME MACHINERY-POWER BUT WITH DIFFERENT TYPES OF MAIN ENGINE

The Authors (of the Bernhard-Nocht-Institut, a medical establishment in Hamburg) discuss some general problems of noise in ships, and present and analyse sound-level measurements taken in a number of different positions (including different locations in the engine-room, various cabins, and the bridge) in cargo-ships. Readings were taken in two 20,700-bhp bulk-carriers, sister-ships but with different types of engine, under similar conditions (including rpm). The average sound-levels in the engine-room and cabins were significantly lower in one ship than in the other. Measurements were also taken in four modern cargo-ships, all of the same series; two of the ships (Nos. 1 and 2) had a main-engine output of 2,400 bhp at 600 rpm and the other two (Nos. 3 and 4) had the same output at 300 rpm. The average sound-levels in the engine-room of Nos. 1 and 2 were higher than those of Nos. 3 and 4, but the reverse applied to cabin sound-levels. The measurements and their statistical analysis and comparison are presented in some detail. It is concluded, inter alia, that it cannot be taken for granted that sister-ships with the same type of engine will have the same noise characteristics. A ship, with its main and auxiliary machinery, is too complicated to allow a theoretical solution to noise problems, but up-to-date techniques should be able to effect considerable inprovements more economically than hitherto. The possible production of a "Sound-Catalogue", which would include noise-reduction methods, is mentioned.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0036603X
• Corporate Authors:

  Seahafen-Verlag Erik Blumenfeld

  Celsiusueg 15, Box 1347
  2 Hamburg 50,   Germany 

  Seehafen-Verlag Erik Blumenfeld

  Celsiusweg 15, Postfach 1347
  2000 Hamburg 50,   Germany 
• Authors:
  • Schmidt, E G
  • HERRMANN, R
  • SCHMIDT, H
• Publication Date: 1976-7

Language

• German

Media Info

• Features: References;
• Pagination: 4 p.
• Serial:
  • Schiff und Hafen
  • Volume: 28
  • ISSN: 0036-603X

Subject/Index Terms

• TRT Terms: Engine rooms; Machinery; Measurement; Noise; Noise control; Ships
• Uncontrolled Terms: Noise measurement; Noise reduction; Ship noise
• Old TRIS Terms: Engine room noise; Machinery noise; Shipboard noise
• Subject Areas: Environment; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00149549
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Apr 13 1977 12:00AM