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A Monotoring-driven approach to Assessment and Control of Structural Systems

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Abstract:
The life-cycle management of structural systems operating under diverse loads involves the tasks of simulation (forward engineering), identification (inverse engineering) and maintenance/control actions. The efficient and successful implementation of these tasks is however non-trivial, due to the ever-changing nature of these systems, and the variability in their interactive environment. Two defining factors in understanding and interpreting such large-scale systems are nonlinear behavior and structural uncertainty. The former is related to the external dynamic loading that might shift the structural response from purely linear to nonlinear regimes, while the latter is related to erroneous modeling assumptions, imprecise sensory information, ageing effects, and lack of a priori knowledge of the system itself.
This talk discusses implementation of methods and tools able to tackle the aforementioned challenges. Among other topics, the use of surrogate models and Bayesian-type filters for the reduced representation and identification of uncertain and nonlinear structural systems is discussed. A semi-active control strategy is further presented for vibration mitigation of such systems, fusing an Unscented Kalman filter (UKF) with the linear-quadratic regulator (LQR).

Type of Seminar:
Control Seminar Series
Speaker:
Prof. Eleni Chatzi
ETH Zurich; Institut of Structural Engineering
Date/Time:
Oct 25, 2017   17:15 h
Location:

ETZ E 8
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Biographical Sketch:
Eleni Chatzi received her PhD from the Department of Civil Engineering and Engineering Mechanics at Columbia University, New York. She is currently an Associate Professor and Chair of Structural Mechanics at the Institute of Structural Engineering of the Department of Civil, Environmental and Geomatic Engineering of ETH Zürich. Her research interests include the fields of structural health monitoring, nonlinear system identification, damage detection, life-cycle assessment, inverse problems, multiscale modeling of composite systems and structural dynamics. She has published numerous articles in peer-reviewed international journals with particular focus on system identification methods and topics relating to SHM. She is currently leading the ERC Starting Grant WINDMIL on the topic of "Smart Monitoring, Inspection and Life-Cycle Assessment of Wind Turbines".