Accession Number : ADP005028

Title :   Nonlinear Problens in Flight Dynamics Involving Aerodynamic Bifurcations,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Tobak,Murray ; Chapman,Gary T.

Report Date : NOV 1985

Pagination or Media Count : 15

Abstract : Aerodynamic bifurcation is defined as the replacement of an unstable equilibrium flow by a new stable equilibrium flow at a critical value of a parameter. A mathematical model of the aerodynamic contribution to the aircraft's equations of motion is amended to accommodate aerodynamic bifurcations. Important bifurcations such as, for example, the onset of large-scale vortex-shedding are defined. The amended mathematical model is capable of incorporating various forms of aerodynamic responses, including those associated with dynamic stall of airfoils.

Descriptors :   *AERODYNAMICS, NONLINEAR ANALYSIS, VORTEX SHEDDING, BIFURCATION(MATHEMATICS), DYNAMIC RESPONSE, EQUATIONS OF MOTION, MATHEMATICAL MODELS, EQUILIBRIUM(GENERAL), STALLING, AIRCRAFT, FLIGHT, TURBULENT FLOW, UNSTEADY FLOW

Distribution Statement : APPROVED FOR PUBLIC RELEASE