National Repository of Grey Literature 8 records found  Search took 0.02 seconds. 
Advanced signal processing in composite material properties investigation
Blaháček, Michal ; Landa, Michal ; Zídek, Jan
Composite material parameters evaluation depends on our ability to simplify complex wave field. Fractional wave mode arrival usually evokes transient effects in the measured signal. In the paper new method of transient effects detection is discussed. The method is efficient tool for fractional wave mode detection and wave arrival time computation.
Laser-generated ultrasound in solids
Blaháček, Michal ; Zídek, Jan ; Landa, Michal ; Urbánek, Přemysl ; Bajgar, Vlastimil
To better understand ultrasonic wave propagation in thin-wall structures and to evaluate physical properties of the structure material, new method for ultrasonic wave generation are necessary. Optical technique using Nd:YAG pulse laser as the wave source is suitable method example. In the paper laser ultrasound technique is discussed and some important results of wavelet analysis are shown.
Elastic wave in thin wall structures and advanced signal processing
Blaháček, Michal ; Převorovský, Zdeněk
Elastic wave propagation analysis is difficult in thin wall structures. Measured signal simplification is desirable. In the paper new method of transient effects detection is discussed. The method is efficient tool for fractional wave mode detection and wave arrival time computation.
AE Event Location under High Background Noise
Blaháček, Michal ; Převorovský, Zdeněk
New approach to AE event definition and localization is suggested. AE event is defined using fuzzy principles. The method is very useful to localize AE events under high backgroud noise, etc.
Probabilistic definition of AE events
Blaháček, Michal ; Převorovský, Zdeněk
New method of AE event definition besed on fuzzy principles is suggested. The method is used to localize AE events occuring during the stamping process of thin metal sheets.
Material assessment of thin wall constructions by means of contactless
Blaháček, Michal ; Landa, Michal ; Zídek, Jan ; Urbánek, Přemysl
The report deal with laser emitted acoustic emission (AE) sources reproducibility. Relation between the AE sources parameters and the source - transducer distance is observed. Symetric and antisymetric elastic wave modes decomposition using bandpass f
Identification of acoustic emission sources in axially loaded composite tubes
Převorovský, Zdeněk ; Blaháček, Michal ; Landa, Michal
Experimental results are shown from the complex study of tubular composite samples.
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.

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