Accession Number : AD0778351

Title :   Lifting Surface Theory and Hydroelastic Instability.

Descriptive Note : Final rept.,

Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s) : Tsakonas,S. ; Jacobs,W. R. ; Ali,M. R.

Report Date : SEP 1973

Pagination or Media Count : 81

Abstract : 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 predice 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)

Descriptors :   *Hydrofoils, Hydrofoil craft, Lifting surfaces, Pitch(Motion), Oscillation, Flutter, Hydrodynamics, Hydroelasticity

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE