Results 261 to 270 of about 145,304 (328)

Chirp excitation of ultrasonic guided waves

Ultrasonics, 2013
Most ultrasonic guided wave methods require tone burst excitations to achieve some degree of mode purity while maintaining temporal resolution. In addition, it is often desirable to acquire data using multiple frequencies, particularly during method development when the best frequency for a specific application is not known.
Michaels, Jennifer E., Lee, Sang Jun, Croxford, Anthony J., Wilcox, Paul D.   +3 more
openaire   +3 more sources

Contact delamination detection of anisotropic composite plates using non-elliptical probability imaging of nonlinear ultrasonic guided waves

Structural Health Monitoring, 2022
Contact delamination damage easily occurs inside the composite. The extension and accumulation of the damage occupy most of the time from damage appearance to failure.
Yuan Liu, Xiaobin Hong, Bin Zhang
semanticscholar   +1 more source

Assessment of damage in composites using static component generation of ultrasonic guided waves

Smart materials and structures (Print), 2022
Static component (SC) generation of guided waves (GWs), which combines the high sensitivity of acoustic nonlinearity to micro-damage and low attenuative effect, has great potential for damage assessment in large composite structures.
Chang Jiang, Changyu Zhang, Weibin Li, M. Deng, C. Ng   +4 more
semanticscholar   +1 more source

Mode repulsion of ultrasonic guided waves in rails

Ultrasonics, 2018
Accurate computation of dispersion characteristics of guided waves in rails is important during the development of inspection and monitoring systems. Wavenumber versus frequency curves computed by the semi-analytical finite element method exhibit mode repulsion and mode crossing which can be difficult to distinguish.
Philip W, Loveday, Craig S, Long, Dineo A, Ramatlo   +2 more
openaire   +2 more sources

Modeling and simulation of backward combined harmonic generation induced by one-way mixing of longitudinal ultrasonic guided waves in a circular pipe.

Ultrasonics, 2021
Nonlinear guided wave has been recognized as a potential means to characterize the state of material microstructures in solids. However, nonlinear guided wave approaches based on second harmonic generation or combined harmonic generation induced by ...
Weibin Li, Zifeng Lan, N. Hu, M. Deng
semanticscholar   +1 more source

Ultrasonic guided wave scattering in a plate overlap

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005
Guided wave scattering in a plate overlap is investigated by numerical calculations and experimental measurements of transmission and reflection factors from the overlap region. In the numerical study, a hybrid boundary element-finite element method is used to calculate the guided wave scattered field from the overlap region.
Won-Joon, Song, Joseph L, Rose, Jose M, Galán, Ramón, Abascal   +3 more
openaire   +2 more sources

Guided wave helical ultrasonic tomography of pipes

The Journal of the Acoustical Society of America, 2003
Ultrasonic guided waves have been used for a wide variety of ultrasonic inspection techniques. We describe here a new variation called helical ultrasound tomography (HUT) that uses guided ultrasonic waves along with tomographic reconstruction algorithms that have been developed by seismologists for what they call “cross borehole” tomography.
Kevin R, Leonard, Mark K, Hinders
openaire   +2 more sources

COMPUTATIONAL METHODS FOR GUIDED ULTRASONIC WAVES IN PLATES

International Journal of Computational Methods, 2006
Reducing the general problem of computing three-dimensional Green's function in a transversely isotropic plate to a finite summation of contributions from a series of planar problems can efficiently yield an accurate solution. Hence, solving the planar scattering problem, of the Pressure-Shear-Vertical (PSV) type or the Shear-Horizontal (SH) type, was
Shah, Arvind, Mahmoud, Abdel-Rahman
openaire   +2 more sources

Ultrasonic guided waves in bone

The Journal of the Acoustical Society of America, 2008
Recent progress in quantitative ultrasound (QUS) has shown increasing interest towards measuring long bones by ultrasonic guided waves. This technology is widely used in the field of non-destructive testing and evaluation of different waveguide structures.
openaire   +2 more sources

Ultrasonic guided wave tomography for ice detection

Ultrasonics, 2016
Of great concern for many structures, particularly critical sections of rotary and fixed wing aircrafts, is the ability to detect ice either on grounded or in-flight vehicles. As a consequence, some work is reported here that could be useful for a variety of different industries where ice formation is an important problem.
Xiang, Zhao, Joseph L, Rose
openaire   +2 more sources