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Professor Eleni Chatzi and Dr. Vasilis Dertimanis, ETH Zürich
The necessity to undertake preventive measures and to come up with methodologies for assessing structural performance and safety has rendered Structural Health Monitoring (SHM) a critical paradigm for condition assessment and life-cycle management of engineered systems. SHM harvests information from sensors suitably deployed on structural systems. In recent years, technological advances have provided an abundance of low-cost and easily deployable sensors, delivering diverse information including strains, dynamic response quantities, loads and environmental condition data. When coupled with appropriate models, this information may guide engineers and operators in the effective management of these systems. However, the task of inferring adequate system models and indicators of performance, is hindered by the so-called polymorphic uncertainties, stemming from a mixture of modeling and measurement imprecisions. Due to lack of a priori knowledge, damage and deterioration processes, variability of environmental and operational influences, measurement errors, as well as simplified simulation assumptions, almost every structural system is characterized by uncertainty. The propagation of uncertainty through such a system comprises a non-trivial task, particularly when the system at hand is described by nonlinear or time varying dynamics, thus furthering the complexity of the governing laws involved. For a number of tasks however, as for increasing the safety, robustness, resilience and capacity of engineered systems, it is necessary to develop models that are able to encompass the aforementioned uncertainties.
Speaker biosketches
Eleni Chatzi received her PhD (2010) 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 and Monitoring 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 (SHM) and structural dynamics, nonlinear system identification, and intelligent life-cycle assessment for engineered systems. She is an author of over 200 papers in peer-reviewed journals and conference proceedings, and further serves as an editor for international journals in the domains of Dynamics and SHM, including the Journal of Sound and Vibration, Structure & Infrastructure Engineering, the Journal of Structural Engineering, Mechanical Systems and Signal Processing, the Journal of Engineering Mechanics, as well as the Sections on Structural Sensing and Computational Methods in Structural Engineering of Frontiers in Built Environment. She is currently leading the ERC Starting Grant WINDMIL on the topic of "Smart Monitoring, Inspection and Life-Cycle Assessment of Wind Turbines". Her work in the domain of self-aware infrastructure was recognized with the 2020 Walter L. Huber Research prize, awarded by the American Society of Civil Engineers (ASCE). She is further recipient of the 2020 EASD Junior Research Prize in the area of Computational Structural Dynamics.
Vasilis Dertimanis was born in Greece. He received a Diploma in Mechanical Engineering from the University of Patras, Greece, and the Ph.D. Degree from the National Technical University of Athens (NTUA), Greece, in the area of modeling and identification of faults in mechanical and structural systems. His research interests lie in the areas of structural identification and health monitoring, linear and nonlinear state estimation, active and passive structural control, hybrid testing and optimization. Vasilis has served as a senior researcher in the NTUA Vehicles Laboratory, Machine Design Laboratory and Laboratory for Earthquake Engineering. He has also participated as a Marie Curie experienced researcher to the EU funded SmartEN ITN project. For more than a decade, he has been in parallel self-employed as a freelancer engineer and inspector, as instructor in training seminars on transportation of dangerous goods by road/rail, as well as a measurement engineer and structural vibration analyst. Since January 2014, Vasilis is a member of the Chair of the Structural Mechanics in ETH Zurich and as of May 2017, he is Senior Assistant (Oberassistent) actively supporting the Chair in Research & Teaching.
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