REDUCTION OF VIBRATION IN SHIPS

The author, of the Bernhard-Nocht-Institut, the Hamburg medical establishment, discusses the results of low-frequency vibration measurements carried out in a 1977-built 10,000-grt container ship, and points out that, contrary to previous experience in most ships, the horizontal-vibration accelerations in this ship, and in some other new ships, can from time to time be large enough to cause considerable discomfort to the crew. This could be caused by the afterbody form, vortex shedding at the stern, and changes in weight distribution; it is particularly noticeable in tall narrow superstructures. In the ship concerned, the swimming pool became unusable on a number of days because the accelerations caused pain, prevented speech, and made breathing difficult. Tests showed that, by bracing a tall narrow superstructure to the deck, in the forward direction, with wire ropes and turnbuckles, the excessive horizontal accelerations can be considerably damped. This indicates that a reduction in these vibrations can be obtained by fitting struts between the superstructure and nodal points on the main deck; if the struts interfered with cargo handling, they could be arranged to swivel out of the way. Order from BSRA as No. 50,010.

  • Availability:
  • Corporate Authors:

    Seehafen-Verlag Erik Blumenfeld

    Celsiusweg 15, Postfach 1347
    2000 Hamburg 50,   Germany 
  • Authors:
    • Schmidt, E G
  • Publication Date: 1978-10

Language

  • German

Media Info

  • Features: References;
  • Pagination: p. 944
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194222
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM