The paper provides a state of the art review of guided wave based structural health
monitoring (SHM). First, the fundamental concepts of guided wave propagation and its …

This paper is a tutorial on Hilbert transform applications to mechanical vibration. The
approach is accessible to non-stationary and nonlinear vibration application in the time …

Negative refraction of elastic waves has been studied and experimentally demonstrated in
three-and two-dimensional phononic crystals, but Bragg scattering is impractical for low …

Elastic waveguides with time-modulated stiffness feature a frequency-periodic dispersion
spectrum, where branches merge at multiple integers of half the modulation frequency and …

In this paper, some recent piezoelectric wafer active sensors (PWAS) progress achieved in
our laboratory for active materials and smart structures (LAMSS) at the University of South …

One of the outstanding challenges in phononic crystals and acoustic metamaterials
development is the ability to tune their performance without requiring structural …

Full wavefield measurements obtained with either an air-coupled transducer mounted on a
scanning stage or a scanning laser vibrometer can be combined with effective signal and …

Delaminations in composite laminates resulting from impact events may be accompanied by
minimal indication of damage at the surface. As such, inspections are required to ensure …

This paper describes a method to effectively image structural features and defects using
local estimates of the wavenumber of propagating guided Lamb waves at a fine grid of …

The article provides a review of the state-of-art non-destructive testing (NDT) methods used
for evaluation of integrated circuit (IC) packaging. The review identifies various types of the …