Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh EnvironmentsReport as inadecuate


Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh Environments


Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh Environments - Download this document for free, or read online. Document in PDF available to download.

Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA





*

Author to whom correspondence should be addressed.



Academic Editors: Dipen N. Sinha and Cristian Pantea

Abstract Harsh environments and confined spaces require that nondestructive inspections be conducted with robotic systems. Ultrasonic guided waves are well suited for robotic systems because they can provide efficient volumetric coverage when inspecting for various types of damage, including cracks and corrosion. Shear horizontal guided waves are especially well suited for robotic inspection because they are sensitive to cracks oriented perpendicular or parallel to the wave propagation direction and can be generated with electromagnetic acoustic transducers EMATs and magnetostrictive transducers MSTs. Both types of transducers are investigated for crack detection in a stainless steel plate. The MSTs require the robot to apply a compressive normal force that creates frictional force coupling. However, the coupling is observed to be very dependent upon surface roughness and surface debris. The EMATs are coupled through the Lorentz force and are thus noncontact, although they depend on the lift off between transducer and substrate. After comparing advantages and disadvantages of each transducer for robotic inspection the EMATs are selected for application to canisters that store used nuclear fuel. View Full-Text

Keywords: electromagnetic acoustic transducers EMATs; magnetostrictive transducers MSTs; shear horizontal SH guided waves; robotic nondestructive inspection electromagnetic acoustic transducers EMATs; magnetostrictive transducers MSTs; shear horizontal SH guided waves; robotic nondestructive inspection





Author: Sungho Choi, Hwanjeong Cho and Cliff J. Lissenden *

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents