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A methodology is presented for health monitoring and subsequent inspection of critical structures. Algorithms have been developed to detect and approximately locate damaged regions by analyzing signals recorded from a permanently mounted, sparse array of transducers. Followup inspections of suspected flaw locations are performed using a dual transducer(More)
In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t The manuscript reports the outcome of investigations on the phononic(More)
The propagation of Lamb waves in elastic plates is analyzed both numerically and experimentally. A Scanning Laser Doppler Vibrometer (SLDV) is here used to detect and visualize transient waveforms propagating in an elastic plate at low ultrasonic frequencies. The waves are excited by a piezoelectric crystal glued to the plate surface and actuated by(More)
Dedicated to my step father (deceased) who did say I should go and do something big and believed in me. To my long time friend Arlene (deceased) who also encouraged me. Still have your text message! To all past teachers, and the glory of God. ACKNOWLEDGEMENTS This acknowledgement is going to be long. First I would like to thank our Lord and Savior Jesus(More)
Plane wave propagation in a chiral lattice is investigated through the application of Bloch's theorem. Two-dimensional dispersion relations are estimated and analyzed to illustrate peculiar properties of chiral or non-centrosymmetric configurations and investigate the directional behavior of wave propagation for varying geometric parameters. Special(More)
Structural health monitoring systems employing embedded guided wave transducers are being considered for aerospace applications. If these systems detect changes that are potentially caused by damage, rapid follow-up inspection is desirable; however, the suspected damage location may be inaccessible. A method is proposed whereby one or more of the embedded(More)
Full acoustic wavefield data were acquired from an aluminum plate with various structural discontinuities and artificial defects using an air-coupled transducer mounted on a scanning stage. Piezoelectric transducers permanently mounted on the specimen were used as wave sources. These source transducers were elements of a permanently attached sparse array. A(More)