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  United States  10019
• Authors:
  • Breslin, J P
• Publication Date: 1971-7

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 85-90
• Serial:
  • Journal of Hydronautics
  • Volume: 5
  • Issue Number: 3
  • Publisher: American Institute of Aeronautics and Astronautics

Subject/Index Terms

• TRT Terms: Excitation; Propellers; Unsteady flow; Vibration
• Old TRIS Terms: Propeller excitation; Propeller vibration
• Subject Areas: Marine Transportation; Vehicles and Equipment;

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