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Experimental Certification of Jet Engine Controllers

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Abstract:
Modern jet engine controllers are necessarily multi-input/multi-output (MIMO) and this requires new approaches to guaranteeing that the controllers work in practice, as compared to SISO controllers which were evaluated by gain or phase margin. The new engines are designed to perform well at many; operating points, constrained conditions, and state of degradation or fleet variability. Our aim is to consider the application of system identification using experimental data to ensure the stability of perhaps hundreds or thousands of different controllers through the testing of a small number of candidate systems via experiment. We shall pose the following problem: Given an unknown MIMO system with a linearized model and a large set of controllers, each of which stabilizes the model, develop an experimental test procedure for a small number of controllers operating on the real system to guarantee that all of the controllers will stabilize the real system. Ideas covered will include; generalized stability margins, the Vinnicombe nu-gap metric, empirical transfer function estimation, and MIMO experiment design. These methods are being developed and implemented as part of a DARPA-funded program to facilitate certification of actual MIMO engine controller designs.

Type of Seminar:
Public Seminar
Speaker:
Prof. Robert Bitmead
Dept of Mechanical & Aerospace Engineering, University of California, San Diego
Date/Time:
Apr 03, 2008   17:15 /
Location:

ETL K 25
Contact Person:

Prof. John Lygeros
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Biographical Sketch:
Robert Bitmead holds the Cymer Corporation Chair in the Department of Mechanical and Aerospace Engineering, University of California, San Diego, where he is also the Associate Vice-Chancellor for Academic Personnel. He received his Ph.D. from the University of Newcastle in 1980. He was with the Australian National University Department of Systems Engineering from 1982 to 1999. He is an IFAC Fellow, a Fellow of the Australian Academy of Technological Sciences and Engineering, and a Fellow of the IEEE. He was a member of the IFAC Council from 1996 to 2002 and a member of IFAC Technical Board from 1990 to 1996. He hails originally from Sydney and was the General Chair of the IEEE Conference on Decision and Control there in 2000. He was the Editor of Automatica for Adaptive and Intelligent Control from 2002 to 2005. He is an accredited Australian Rules Football field umpire and officiates in matches across the USA.