EXCITING-FORCE OPERATORS FOR SHIP PROPELLERS

The unsteady transfer functions or vibratory-exciting force and moment operators for any ship propeller are found by a procedure which employs an existing computer program. These functions can then be applied to any given radial variation of a spatially varying hull wake or inflow to yield three forces, three moments, and the blade bending moments. With these operators (which can be found once and for all for a systematic series of propellers), the task of predicting the vibratory-exciting forces and moments acting on the bearings of a particular ship is reduced to a simple calculation that can be made with a desk calculator in a matter of minutes. Thus, once a complete set of operators are obtained from the elaborate computer program, subsequent applications to any specific wakes does not require the computer program. Application of the method to a 5-bladed propeller is given in a worked example using simple formulas and tabulated values of the operators.

  • Corporate Authors:

    American Institute of Aeronautics and Astronautics

    1290 Avenue of the Americas
    New York, NY  USA  10019
  • Authors:
    • Breslin, J P
  • Publication Date: 1971-7

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 85-90
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00028971
  • Record Type: Publication
  • Source Agency: American Institute of Aeronautics and Astronautics
  • Files: TRIS
  • Created Date: Apr 21 1972 12:00AM