FLUTTER ANALYSIS OF A HYDROFOIL NEAR A FREE SURFACE

Abstract

The flutter characteristics of a two-dimensional hydrofoil near a free surface are analyzed, with consideration given to the cases of both one and two degrees of freedom. The flutter equations incorporate lift and moment as determined from an exact linearized potential solution. Free-surface effects are included without approximation. Results indicate that for the system having two degrees of freedom, the free surface has very little effect on flutter boundaries, despite the large changes in hydrodynamic loading caused by foil- induced surface waves. When the hydrofoil was constrained to move only in pitch, however, flutter solutions were found where none exist in the absence of the free surface, for practical values of mass ratio and pitch-axis position.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1965
Accession Number
AD0619661

Entities

People

  • John M. Grace
  • Peter Crimi

Organizations

  • Calspan

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Boundaries
  • Compressible Flow
  • Computer Programs
  • Computers
  • Control Surfaces
  • Equations
  • Equations Of Motion
  • Flow
  • Fluid Dynamics
  • Frequency
  • Froude Number
  • Mach Number
  • Resonant Frequency
  • Ship Model Basins
  • Surface Waves
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Calculus or Mathematical Analysis
  • Marine Hydrodynamics