Sensory Communication

Contains table of contents for Section 2, an introduction and reports on twelve research projects.National Institutes of Health Grant R01 DC00117National Institutes of Health Grant R01 DC02032National Institutes of Health/National Institute of Deafness and Other Communication Disorders Grant 2 R01 DC00126National Institutes of Health Grant 2 R01 DC00270National Institutes of Health Contract N01 DC-5-2107National Institutes of Health Grant 2 R01 DC00100U.S. Navy - Office of Naval Research Grant N61339-96-K-0002U.S. Navy - Office of Naval Research Grant N61339-96-K-0003U.S. Navy - Office of Naval Research Grant N00014-97-1-0635U.S. Navy - Office of Naval Research Grant N00014-97-1-0655U.S. Navy - Office of Naval Research Subcontract 40167U.S. Navy - Office of Naval Research Grant N00014-96-1-0379U.S. Air Force - Office of Scientific Research Grant F49620-96-1-0202National Institutes of Health Grant RO1 NS33778Massachusetts General Hospital, Center for Innovative Minimally Invasive Therapy Research Fellowship Gran

The Boundary Element Method for Flaw Classification in Wave Guides

Guided waves scattered from defects in solid material might contain significant information about those defects. The major goal of non-destructive evaluation is to interpret the ultrasonic signatures from these defects. Scattering of Lamb waves from a normal, surface breaking defect is considered in this study. Reflection and transmission factors of the scattered modes are used to reconstruct the size of the flaws. Scattering Lamb waves from a crack have been investigated in [1–7]. Resonance phenomena for a crack parallel to the plate surface is considered in [5,6]. In this study, the boundary element method combined with the normal mode technique [1,8] is used to study the relationship between crack size and the parameters of the incident mode. Irregular behavior of the reflection coefficient for special parameters of the incident mode is used for size classification.</p