With increased dimensions and installed power, heavier shaft systems are applied in modern ships. The consequence is a shift of the resonance of the shafting system to lower frequencies. At the same time the number of blades of the propeller are necessarily increased in order to absorb the higher power and to meet the requirement of restricted draft. Consequently, the blade frequency (blade number multiple of number of shaft revolutions per second), which is the most important excitation frequency, does not show a strong reduction. In many cases even an increase will be bound. The difference between excitation and resonance frequency is diminished, so that the propeller operation at service speed is close to or on the resonance of the shafting vibrations. For the transverse vibrations this is more relevant than for the longitudinal vibrations and this paper is restricted to the transverse, lateral or whirling vibrations.

  • Supplemental Notes:
    • Symposium on High Powered Propulsion of Large Ships, Part 1, December 10-13, 1974, Wageningen, Netherlands. Entire proceedings-2 volumes, 26 papers-available for $21.00.
  • Corporate Authors:

    Netherlands Ship Model Basin

    Haagsteed 2, P.O. Box 28
    Wageningen,   Netherlands 
  • Authors:
    • Hylarides, S
    • van Gent, W
  • Publication Date: 1974-12

Media Info

  • Features: References;
  • Pagination: 54 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00128941
  • Record Type: Publication
  • Source Agency: Netherlands Ship Model Basin
  • Report/Paper Numbers: No. 490
  • Files: TRIS
  • Created Date: Feb 4 1976 12:00AM