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Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 9 z 9
Karatodorov, Stefan , Mihailov, Valentin I. , Křenek, Tomáš , Grozeva, Margarita
Optická emisní spektroskopie plasmy vzniklé laserovou ablací sulfidu železnatého

Optical emission spectroscopy studies are reported of laser ablation plasma from an iron sulphide (FeS) target in vacuum. The plasma emission is characterized with spatial and tempoal resolution. The spectral observations are used to calculate the electron plasma parameters. The electron tem...

Smazalová, Eva , Houdková-Šimůnková, Šárka
Potenciál snímání EA při hodnocení indentační lomové houževnatosti.

In this study, an attempt is made to characterize the brittleness of the material by crack formation with the Vickers indenter. To assess the critical load, the sensor of AE signal was used. After preliminary tests on a silica glass, the methodology was applied to HVOF&#x...

Čibera, Václav , Matas, Richard , Sedláček, Jan
Parametrický model ventilátoru pro simulaci v OpenFOAMu a Elmeru

The main goal of presented work was to develop parametric model of a ventilator for CFD and structural analysis. The whole model was designed and scripted in freely available open source programmes in particular in OpenFOAM and Elmer. The main script, which runs or generates&#...

Moskal, Denys , Martan, Jiří , Kučera, Martin , Houdková-Šimůnková, Šárka , Kromer, Robin
Pikosekundové laserové čištění povrchu AM1 superslitiny

Laser scanning processing of nickel-based superalloy AM1 surfaces by ultra-short pulses (10 ps) is introduced as a cleaning and deoxidation postprocess. The laser cleaning is investigated with two-directional surface scanning by a laser beam with several frequencies of pulse generation. The ...

Hruška, Matěj , Tesař, Jiří , Vostřák, Marek , Smazalová, Eva
Vliv změny optických vlastností povrchu na absorpci laserového záření

This study examines the relation between surface condition and its response to interaction with a laser. The surface character is modified by the creation of oxide layer. The oxide layers were created by solid state pulsed laser that is mostly used for industrial marking. The&...

Vostřák, Marek , Hruška, Matěj , Houdková-Šimůnková, Šárka , Smazalová, Eva
Coaxial laser cladding of internal diameter

The paper summarizes the result of laser cladding experiments design to observe the influence of the mutual angle of the cladding head and treated sample. The system, combining solid state disc laser with power up to 5.3 kW and cladding head with coaxial powder feeding, w...

Moskal, Denys , Martan, Jiří , Smazalová, Eva , Houdková-Šimůnková, Šárka
Vliv stavu povrchu na výsledek laserového povrchového texturovaní

Laser surface texturing (LST) is one of the methods for obtaining surfaces with specific properties. In this paper the influence of initial surface state of sliding bearing steel on laser texturing of this material was studied. Initial surface with roughness R_a = 0.13 µm was&...

Voldřich, Josef , Lazar, Jan , Polach, Pavel
Kontaktní tuhosti a analýza nelineárních vibrací olopatkovaných disků s třecími kontakty mezi sousedními lopatkami

This work is focused on the computation of vibrations for the last stage bladed disks of steam turbines. The blades with two integral structural contact (ISC) couplings are considered. The cyclic symmetry properties of bladed disks and the method of modal transformation utilising f...

Houdková-Šimůnková, Šárka , Vostřák, Marek , Česánek, Zdeněk
Vliv procesních paramerů na mikrostrukturu WC-NiCrBSi laserového návaru

Laser cladding is a progressive technology enabling to deposit coatings in thickness higher than 1 mm. In comparison with the conventional overwelds it offers the advantage of thinner heat-affected zone in the substrate material and lower and better controlled inner residual stress and&...

Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 9 z 9