Title :
Application of nonlinear global analysis and system identification to aircraft-pilot coupled oscillations
Author :
Mehra, R.K. ; Prasanth, R.K.
Author_Institution :
Sci. Syst. Co., Woburn, MA, USA
Abstract :
We present a general framework for the global analysis of nonlinear pilot-induced oscillations (PIOs). The approach involves computation of nonlinear phenomena such as Hopf bifurcation that lead to large changes in structural stability of the pilot-vehicle system (PVS). As an example, the X-15 PIO caused by rate-limiting is considered. The result shows a large jump in limit cycle amplitude indicating a significant change in PVS structural stability. We also present results on PIO detection using subspace identification. Numerical results with linear airframe and rate saturating actuators show that this approach is feasible
Keywords :
aircraft; bifurcation; identification; man-machine systems; oscillations; stability; aircraft; limit cycle; nonlinear global analysis; pilot-induced oscillations; pilot-vehicle system; structural stability; system identification; Aircraft; Bifurcation; Couplings; Fluid dynamics; Geometry; Limit-cycles; Nonlinear dynamical systems; Structural engineering; System identification; Vehicle dynamics;
Conference_Titel :
Control Applications, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Trieste
Print_ISBN :
0-7803-4104-X
DOI :
10.1109/CCA.1998.721691
