Dr. Gary J. Balas
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Browsing Dr. Gary J. Balas by Author "Bokor, Jozsef"
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Item Invariant Subspaces for LPV Systems and their Applications(Institute of Electrical and Electronic Engineers, 2003-11) Balas, Gary J.; Bokor, Jozsef; Szabo, ZoltanThe aim of this note is to extend the notion of invariant subspaces known in the geometric control theory of the linear time invariant systems to the linear parameter-varying (LPV) systems by introducing the concept of parameter-varying invariant subspaces. For LPV systems affine in their parameters, algorithms are given to compute many parameter varying subspaces relevant in the solution of state feedback and observer design problems.Item Linear Parameter-Varying Detection Filter Design fora Boeing 747-100/200 Aircraft(American Institute of Aeronautics and Astronautics, 2005) Szaszi, Istvan; Marcos, Andres; Balas, Gary J.; Bokor, JozsefWe present a fault detection and isolation (FDI) filter design using a linear parameter-varying (LPV) model of the longitudinal dynamics of a Boeing 747 series 100/200. The LPV FDI filter design is based on an extension of the fundamental problem of residual generation concepts elaborated for linear, time-invariant systems. Typically, the FDI filters are designed for open-loop models, and applied in closed loop. An application is shown of an LPV FDI filter for actuator failure detection and isolation in the closed-loop longitudinal LPV system to the full nonlinear Boeing 747 aircraft simulation, which represents the “true” system.