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CLoVER: an alterntive concept for damage interrogation in structural health monitoring systems

Published online by Cambridge University Press:  03 February 2016

K. I. Salas  and
C. E. S. Cesnik
K. I. Salas
Affiliation:
Department of Aerospace Engineering, The University of Michigan, Ann Arbor, Michigan, USA
C. E. S. Cesnik
Affiliation:
[email protected], Department of Aerospace Engineering, The University of Michigan, Ann Arbor, Michigan, USA
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Abstract

Structural Health Monitoring (SHM) is the component of damage prognosis systems responsible for interrogating a structure to detect, locate, and identify any damage present. Guided wave (GW) testing methods are attractive for this application due to the GW ability to travel over long distances with little attenuation and their sensitivity to different damage types. The Composite Long-range Variable-direction Emitting Radar (CLoVER) transducer is introduced as an alternative concept for efficient damage interrogation in GW SHM systems. This transducer has an overall ring geometry, but is composed of individual wedge-shaped anisotropic piezocomposite sectors that can be individually excited to interrogate the structure in a particular direction. The transducer is shown to produce actuation amplitudes larger than those of a similarly sized ring configuration for the same electric current input. The electrode pattern design used allows each sector to act as an independent actuator and sensor element, decreasing the number of separate transducers needed for inspection. The fabrication and characterisation procedures of these transducers are described, and their performance is shown to be similar to that of conventional piezocomposite transducers. Experimental studies of damage detection demonstrating the proposed interrogation approach are also presented for simulated structural defects.

Type
Research Article
Information
The Aeronautical Journal , Volume 113 , Issue 1144: Flight structures fundamental research in the United States of America: A Special Issue , June 2009 , pp. 339 - 356
Copyright
Copyright © Royal Aeronautical Society 2009 

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