Using a generalised tailshaft model of the propulsion system, design charts are constructed for rapidly estimating the self-excited whirling critical speeds of the shafting system over a wide range of design parameters. These design-chart estimates may be refined to any desired accuracy by a program developed for a programmable hand calculator. The analysis includes propeller mass and rotary inertia, propeller gyroscopic effects, shaft mass and flexural rigidity, and partial fixity of the line shafting at the forward bearing. Entrained water may be included as a proportion of the propeller mass and inertia. The non-dimensional form of the design charts offers several advantages, for example, the option of employing any consistent system of units, or a quick assessment of the sensitivity of the critical whirling speeds to design parameters of the system. Comparison of the results from the charts with other methods of whirling estimation shows the advantages of the Author's approach.

  • Supplemental Notes:
    • J.Ship Res., 26 <1982>, p.190 <Sept.> (19 pp., diags. and charts, tables, 6 ref.)
  • Authors:
    • Yagoda, H P
    • Ketchman, J
  • Publication Date: 1982


  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00684436
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM