Juan A. Gallego-Juárez, Research Professor at the Higher Council for Scientific Research of Spain (CSIC). Karl Graff, Senior Engineer at EWI and Professor Emeritus, The Ohio State University, USA. Margaret Lucas is the Regius Chair of Civil Engineering and Mechanics, Professor of Ultrasonics, Power & Energy Division in the School of Engineering at the University of Glasgow, Scotland, UK. Dr. Lucas’s research background is in vibration analysis within power ultrasonics.