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SUMMARY:Control-based Continuation – A new paradigm for testing nonlinea
 r systems - Dr Ludovic Renson\, Imperial College London
DTSTART:20231124T160000Z
DTEND:20231124T170000Z
UID:TALK206074@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:In this talk\, I will argue that most experimental testing met
 hods commonly used to characterise the behaviour of (nonlinear) systems ar
 e analogues to direct initial-value simulations and thus present numerous 
 drawbacks when studying the dynamics of nonlinear systems. Alternative met
 hods\, considering tests in closed-loop conditions\, have demonstrated the
 ir superiority over traditional approaches and are becoming increasingly p
 opular. Control-based continuation (CBC) is one of these methods. It uses 
 feedback control to apply the principles of numerical continuation directl
 y to a physical system and obtain experimental bifurcation diagrams withou
 t the need for a mathematical model. \nI will introduce the principles of 
 CBC and illustrate some of its capabilities on a mechanical structure exhi
 biting modal interactions. I will then discuss some of the challenges asso
 ciated with the method and briefly present some recent developments improv
 ing the method’s robustness (using local surrogate models) and systemati
 c control design (using adaptive nonlinear control). I will then conclude 
 by discussing how the data gathered with CBC is helpful for nonlinear mode
 l development\, parameter estimation\, and validation. I will illustrate t
 his discussion using limit cycle oscillation data collected on a 2-DOF aer
 oelastic rig tested in a wind tunnel\, comparing mechanistic and physics-b
 ased machine-learning models.\nBio: Dr Ludovic Renson is a Senior Lecturer
  in the Department of Mechanical Engineering at Imperial College London\, 
 where he leads a research group on nonlinear dynamics and control. Ludovic
  obtained his PhD at the University of Liege (Belgium) in 2014. Ludovic wa
 s a postdoctoral research fellow at the University of Bristol before his a
 ppointment at Imperial in 2019. \n
LOCATION:JDB Seminar Room\, CUED
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