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SUMMARY:L1 Adaptive Control and Its Transition to Practice - Prof Naira Ho
 vakimyan (UIUC)
DTSTART:20110905T130000Z
DTEND:20110905T140000Z
UID:TALK32603@talks.cam.ac.uk
CONTACT:Dr Ioannis Lestas
DESCRIPTION:The history of adaptive control systems dates back to early 50
 -s\, when the aeronautical community was struggling to advance aircraft sp
 eeds to higher Mach numbers. In November of 1967\, X-15 launched on what w
 as planned to be a routine research flight to evaluate a boost guidance sy
 stem\, but it went into a spin and eventually broke up at 65\,000 feet\, k
 illing the pilot Michael Adams. It was later found that the onboard adapti
 ve control system was to be blamed for this incident. Exactly thirty years
  later\, fueled by advances in the theory of nonlinear control\, Air Force
  successfully flight tested the unmanned unstable tailless X-36 aircraft w
 ith an onboard adaptive flight control system. This was a landmark achieve
 ment that dispelled some of the misgivings that had arisen from the X-15 c
 rash in 1967. Since then\, numerous flight tests of Joint Direct Attack Mu
 nitions (JDAM) weapon retrofitted with adaptive element have met with grea
 t success and have proven the benefits of the adaptation in the presence o
 f component failures and aerodynamic uncertainties. However\, the major ch
 allenge related to stability/robustness assessment of adaptive systems is 
 still being resolved based on testing the closed-loop system for all possi
 ble variations of uncertainties in Monte Carlo simulations\, the cost of w
 hich increases with the growing complexity of the systems. This talk will 
 give an overview of the limitations inherent to the conventional adaptive 
 controllers and will introduce the audience to the L1 adaptive control the
 ory\, the architectures of which have guaranteed robustness in the presenc
 e of fast adaptation. Various applications\, including flight tests of a s
 ubscale commercial jet\, will be discussed during the presentation to demo
 nstrate the tools and the concepts. With its key feature of decoupling ada
 ptation from robustness L1 adaptive control theory has facilitated new dev
 elopments in the areas of event-driven adaptation and networked control sy
 stems. A brief overview of initial results and potential directions will c
 onclude the presentation.
LOCATION:Cambridge University Engineering Department\, LR6
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