1. Modeling the Excitation of Lamb and SH Waves by Point and Line Sources. Author Wilcox, P. Subjects TRANSDUCERS, ELECTROMECHANICAL devices, ELECTRIC equipment, MECHANICAL engineering, ENGINEERING, RESEARCH Abstract The guided wave field excited in a plate-like structure from any weakly coupled transducer can be calculated from the superposition of the guided wave fields due to a number of suitable point or line excitation sources. In this paper, the fields from various point and line excitation sources are reviewed and relationships between them are demonstrated. The performance of pancake coil EMATs is modeled using the superposition of the fields from point sources and the results compared with experiment. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR] Published 2004 Full Text View/download PDF
2. On the Scattering and Mode Conversion of the A0 Lamb Wave Mode at Circular Defects in Plates. Author Fromme, P., Wilcox, P., Lowe, M., and Cawley, P. Subjects SCATTERING (Physics), WAVES (Physics), ELECTRIC equipment, MECHANICAL engineering, ENGINEERING, RESEARCH Abstract The sensitivity of a permanently attached guided wave array for the detection of corrosion damage in plates is studied. The thickness reduction due to corrosion is modeled as a circular part-through hole. The scattering and mode conversion of the A0 Lamb wave mode is calculated numerically employing a three-dimensional finite element model and verified in laboratory experiments. Good agreement is found and the sensitivity of the guided wave monitoring of large areas can be predicted. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR] Published 2004 Full Text View/download PDF