A novel holographic technique has been developed which for the first time allows the measurement of the deflection of propeller blades while rotating. The technique requires that an axially-symmetric wavefront be directed onto both the propeller blade and a holographic plate rotating with with the propeller. Some deflection results for a propeller rotating in air are presented and the technique has been shown to be feasible for propellers rotating in water. Stresses for the rotating propeller have been obtained from the deflections by using pure bending-plate theory. The method was verified by strain gages for a propeller blade subjected to uniform static pressure. The technique provides a method for obtaining deflections, strains, stresses, and vibration modes for rotating objects such as marine and aircraft propellers, helicopter rotors, generator and turbine blades.

  • Corporate Authors:

    Naval Ship Research and Development Center

    Structures Department
    Bethesda, MD  United States  20034
  • Authors:
    • Sikora, J P
    • Peterson, H A
    • Mendenhall Jr, F T
  • Publication Date: 1974-11

Media Info

  • Features: Figures;
  • Pagination: 30 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00084456
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: #4507
  • Files: TRIS
  • Created Date: May 7 1975 12:00AM