PROPELLER-EXCITED PRESSURE FLUCTUATIONS: MEASUREMENT AND CALCULATION

After an introduction in which general information is given on propeller-induced pressure fluctuations, the Author outlines methods used for the approximate calculation of these fluctuations at an early stage in the design of the ship and for their more exact calculation. For the latter, Germanischer Lloyd uses the FPROPFOR program <based on formulae presented by Holden et al. in a 1980 SNAME paper>. Features of the program, which is briefly described, include handling of the cavitation-induced components of the pressure fluctuations. To check calculated data and improve empirical calculations, the measurement of propeller-induced pressure fluctuations is still needed. Model measurements are useful, but correlation of results with the full scale remains a considerable difficulty. Since 1980 Germanischer Lloyd has been carrying out full-scale measurements at about 12 positions on the plating in the vicinity of the propeller; the procedure and equipment are briefly described, with some sample results. Experience so far has shown good to very good agreement between measurement and calculation for twin-screw ships, but has not been so good with single-screw ships.

  • Supplemental Notes:
    • Schiff u. Hafen, 35 <1983>, p.85 <May> (3 pp., 15 ref., 2 tab., 3 graphs, 6 diag.)
  • Authors:
    • Nath, C
  • Publication Date: 1983

Language

  • German

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00685046
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM