Global Stability and Control Analysis of Aircraft at High Angles-of-Attack.
Abstract
Aircraft dynamic behavior at high angles-of-attack is highly nonlinear, and in the past there hsa been a lack of suitable techniques for analyzing the global behavior of nonlinear systems. Under a previous project with the Office of Naval Research, Scientific Systems, Inc. has developed a new approach based on Bifurcation Analysis and Catastrophe Theory Methodology (BACTM). The approach has been applied to specific jump and limit cycle behavior such as roll-coupling, pitch up, post-stall departure, divergence, spin entry, developed erect spin, and spin prevention and recovery. The aircraft used for the study of spin motions was selected because of the completeness of the aero data in the spin flight regimes, and because it is representative of modern fighters. This model was also used for studies of non-spin, high angle-of-attack behavior. Under this project, the full six DOF aircraft model was implemented, and used not only for the above studies, but also for several new developments in the BACTM methodology. The new developments are basically in the area of generalizing and improving the numerical techniques for computing equilibrium and bifurcation surfaces, in expanding the comprehensiveness of the physical model and environment and in the study of chaotic motions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1978
- Accession Number
- ADA084921
Entities
People
- James V. Carroll
- Raman K. Mehra