LIFTING SURFACE THEORY AND HYDROELASTIC INSTABILITY

A brief review is presented of the unsteady lifting surface theory and of the 'generalized lift operator' technique of inverting the 'downwash' integral equation. The integral equation approach is then employed to predict responses of various foils to pitching oscillations and to forward motion in a regular wave train. The agreement between theoretical predictions and experimental results is good for simple configurations without appendages, but not in the case of the AG(EH) configuration at low frequencies because the presence of the pod is not taken into account in the theoretical calculations. Although the attempt made to remove the spurious leading-edge singularity in the chordwise pressure distribution before inverting the integral equation is questionable, removal of the singularity after the inversion yields responses consistent with other theoretical and experimental trends. (Modified author abstract)

• Corporate Authors:

  Stevens Institute of Technology

  Davidson Laboratory, Castle Point Station
  Hoboken, NJ  United States  07030
• Authors:
  • TSAKONAS, S
  • JACOBS, W R
  • Ali, M R
• Publication Date: 1973-9

Media Info

• Pagination: 81 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Flutter; Flutter (Aeronautics); Hydroelasticity; Hydrofoil boats; Hydrofoils
• Old TRIS Terms: Hydrofoil craft; Lifting surface theory
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00057239
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SIT-DL-73-1653 Final Rpt.
• Contract Numbers: N00014-67A-0202-0032
• Files: TRIS
• Created Date: Aug 28 1974 12:00AM