TRANSMISSION OF STRUCTURE-BORNE NOISE THROUGH PIPE SYSTEMS

After mentioning that noise levels in corresponding spaces of similar ships can show considerable differences, and that it is usually impracticable to investigate such anomalies during sea trials, the Author describes the case of a coaster which, during her trials, displayed the very high noise-level of 73 dB(A) in the sick-bay. The trouble was traced to a vibrating pipe in the adjoining machinery-casing, and the noise was substantially reduced by the insertion of a rubber strip between the pipe and a support. On later investigation, the pipe was identified as a vent pipe attached to the main engine, and was typical of parts which have for years been regarded as of no consequence acoustically. Further information, including sound-level/frequency curves, is given on this case, and it is pointed out that, in general, a pipeline can, because of its uniform cross-section, behave in a similar way to a rod or bar and transmit noise over long distances without reducing it significantly. Pipes in a ship can be divided into those unlikely to do so (e.g., drain pipes and vent pipes). However, pipes of the two categories are often in contact with one another in pipe systems, and noise from the first category can thus be transmitted to the "unlikely" category. This and other difficulties can be avoided by careful design of pipe systems, and the Author mentions several possible noise-reduction measures. Accurate assessment of such measures requires long-term co-operation between the shipyard and the acoustics expert. Order from: BSRA as No. 48,514.

  • Availability:
  • Supplemental Notes:
    • Presented at a Session of the Ship-Vibration Committee of the STG, held in Hamburg in November 1976.
  • Corporate Authors:

    Seehafen-Verlag Erik Blumenfeld

    Celsiusweg 15, Postfach 1347
    2000 Hamburg 50,   Germany 
  • Authors:
    • Taubert, O
  • Publication Date: 1978-2

Language

  • German

Media Info

  • Features: References;
  • Pagination: 2 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00179544
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Aug 27 1978 12:00AM