Collocation Flutter Analysis Study. Volume 4. COFA Computer Program to Perform Flutter Analysis by the Collocation Method

Abstract

A collocation solution of the flutter and vibration problems for a multiple component system is presented. The formulation utilizes structural, aerodynamic, and inertial characteristics in the form of matrices of structural and aerodynamic influence coefficients and a mass matrix, respectively, for each component. The use of a rigid-body modal matrix permits a general analysis for a system free in space with up to six rigid-body degrees of freedom. The computer program provides the flutter or vibration solution for a system composed of as many as 20 flexible components with a maximum total of 49 collocation control points. An option is provided to vary the density as well as the reduced velocity. Another option is provided to yield the modes from a vibration analysis in a punched-card format for use in flutter analysis by modal methods.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1969
Accession Number
AD0859289

Entities

People

  • Donald R. Ulbrich

Organizations

  • Hughes Aircraft Company

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aircrafts
  • Altitude
  • Artificial Intelligence
  • Atmospheric Density
  • Boundaries
  • Composite Materials
  • Computer Programs
  • Computers
  • Eigenvalues
  • External Stores
  • Frequency
  • Geometry
  • Integral Equations
  • Punched Cards
  • Resilience
  • Vehicles

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers