The noise in the compartments of an icebreaker was studied to determine its nature and to find methods for reducing its intensity. The studies were conducted on the welded diesel-electric icebreaker Kiev; the noises in various compartments were recorded on magnetic tapes and were subjected to frequency analysis. For each octave, a histogram was constructed showing the density distribution vs the noise intensity in decibels. To indicate the irregularity of noise, two quantities were determined: the average noise level L(a) and the noise level L(0.1) which is exceeded in intensity less than 10 percent of the time. For machine noises, L(0.1)-L(a) = 1.5 db; for ice noises in the bow, this difference equals 6--10 db, indicating its irregular nature. Contours of the penetration into the ship by various frequency noises indicate that the higher frequencies penetrate deeper than the lower ones. As the ice thickness increases, the noise increases up to a maximum, and then decreases as the ship is slowed. In the bow, the acceptable noise was found to be exceeded by 10--20 db at all frequencies, even at some distance by 2--3 db at high frequencies. It is recommended that the noise must be reduced by 15--20 db at all frequencies.

  • Authors:
    • Avferonok, E I
    • Boroditskiy, L S
    • Bystrov, A S
    • Chetyrkin, N R
  • Publication Date: 1968

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Filing Info

  • Accession Number: 00014940
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM