National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
The effect of geometrical dispersion on stress wave propagation
Hora, Petr
The effect geometrical dispersion is that the energy in a wave-packet propagates at different speeds depending on its frequency. This manifests itself as a spreading of the wave-packet in space and time as it propagates through a structure. It is show that duration of a wave-packet increases linearly with propagation distance and also that the duration of a wave-packet after a given propagation distance depends on the input signal.
Non-destructive material evaluation by non-contact ultrasound
Landa, Michal
The paper presents new non-invasive ultrasonic methods have been developed for physical properties evaluation of namely non-porrous materials. Two non-invasive ultrasonic methods (laser ultrasound, ultrasound with air-coupling) were described and advages and limitations are shown on the experimental results.
Selection of signal parameters for analysis of AE sources
Chlada, Milan ; Převorovský, Zdeněk ; Mrázová, I.
The paper describes several methods of signal feature set selection, applied on boath experimental and simulated AE data.
Non-linear acoustic spektoscopy and new methods of flaw detection
Převorovský, Zdeněk
In the paper, the non-linear techniques, known as NEWS (Nonlinear Elastic Wave Spektroscopy) and their modifications are briefly described .
Elastic wave attenuation in glass plates
Blaháček, Michal ; Zídek, Jan
Elastic wave attenuation in glass plates and reproducibility of laser excited AE sources are discussed.

Interested in being notified about new results for this query?
Subscribe to the RSS feed.