8th European Workshop On Structural Health Monitoring (EWSHM 2016)
5-8 July 2016, Spain, Bilbao
Right Now in Bilbao 23:24 Mon 9
10:30 Tuesday 5. Jul - A2
Predictive simulation of guided wave SHM with piezoelectric wafer active sensors
Abstract »This paper will present an overview of recent developments on predictive simulation of guided wave structural health monitoring (SHM) with piezoelectric wafer active sensor (PWAS) transducers. The predictive simulation methodology is based on the hybrid global local (HGL) concept which allows fast analytical simulation in the undamaged global field and finite element method (FEM) simulation in the local field around and including the damage. The paper reviews the main results obtained in this area by the researchers working in the Laboratory for Active Materials and Smart Structures (LAMSS) at the University of South Carolina, USA. The first part of the paper presents the methodology for analytical guided wave simulation in the global field in interaction with PWAS transmitters and receivers and scatter sources. Both 1-D and 2-D guided wave propagation situations are separately considered. This methodology includes multi-wave-mode interaction and mode-wave-tuning for finite-size PWAS transducers as well as PWAS impedance concepts that allow the analytical simulation of mechanical wave response as a result of an electrical input applied to the PWAS transmitter and, vice-versa, the electrical signal generated by a PWAS receiver in response to an incoming mechanical wave. The second part of the paper presents the methodology for predicting the scatter field generated from the interaction between guided waves and damage. The concept of local FEM high-density high-accuracy meshing is presented. The framework for extracting the wave-damage interaction coefficients (WDIC) for is presented the fundamental A0, S0, SH0 modes. The local FEM region is extended to partially overlap with the global analytical region such that the scatter from a incoming guided wave can be captured and identified with the appropriate A0, S0, SH0 modes. Nonreflective boundaries (NRB) are used to prevent boundary reflections due to the finite size of the FEM region. The third part of the paper discusses several examples such as the scatter interaction with a crack in a 1-D waveguide and the scatter from a cracked rivet hole in a plate. It is shown that certain frequency-wave mode combinations may facilitate detection whereas others combinations may actually impede detection. The paper ends with summary, discussion, and suggestions for future work.
AuthorsGiurgiutiu, VictorGiurgiutiu, Victor
Dr. Victor Giurgiutiu received his BSc(Eng) in Aeronautics and his PhD in Aeronautical Structures from Imperial College, London, UK in 1972 and 1977, respectively. He has a wide research interest in structural mechanics that spans active materials, smart structures, structural health monitoring, mechatronics, and other multi-physics applications. Dr. Giurgiutiu is Professor of Mechanical Engineering and Director of the Laboratory for Active Materials and Smart Structures (LAMSS) at the University of South Carolina. He has published 7 books, 16 book chapters, 102 archival journal articles, and many conference papers. He is widely cited worldwide with h-index=39. His book on Structural Health Monitoring with Piezoelectric Wafer Active Sensors (Elsevier Academic Press, now at the 2nd Ed.) has been cited ~750 times, and two of his seminal papers have received ~500 and ~400 citations, respectively. He was elected Fellow of the Royal Aeronautical Society (RAeS), Fellow of ASME, and Associate Fellow of AIAA. Dr. Giurgiutiu serves as Special Issues Editor to the Structural Health Monitoring – An International Journal (Sage, UK). He is Associate Editor to the Aeronautical Journal of RAeS and Associate Editor to the International Journal of Sustainable Materials and Structural Systems (Inderscience Pub., Switzerland). He was recognized as Structural Health Monitoring Person of the Year 2003. He has recently completed his duty as co-chair of the SPIE Symposium on Smart Structures and NDE which comprises 10 parallel conferences and has an international participation of over 800 attendees. During 2006-2009 he served as Structural Mechanics Program Manager with the Air Force Office of Scientific Research (AFOSR).
UNIVERSITY OF SOUTH CAROLINA