Papers Published

1. Protz, J.M. and Paduano, J.D., Rotating stall and surge: Alternate modeling and control concepts, IEEE Conference on Control Applications - Proceedings (1997), pp. 866 - 873 [CCA.1997.627770] .
   (last updated on 2007/04/06)

   Abstract:
   This paper describes alternative formulations of the rotating stall control problem. Jet injection instead of bleed valve actuation is introduced, and asymmetric instead of one-dimensional (plenum bleed) control of rotating stall waves is cast into the Galerkin framework, resulting in a four-state nonlinear model. Shortcomings of very low-order modeling are discussed, and it is suggested that a more general high-order Galerkin model is more suitable for control law design. Two asymmetric (two-dimensional) nonlinear control examples are then given. The first demonstrates the utility of asymmetric feedback by showing how it can, unlike 1D control, alter the equilibrium properties of the low-order model. The second shows how a Lyapunov analysis motivates a family of nonlinear controllers which account for the multi-dimensional nature of the rotating stall stabilization problem.

   Keywords:
   Surges (fluid);Nonlinear control systems;Feedback;Lyapunov methods;Mathematical models;Control nonlinearities;