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Malý aerodynamický tunel pro vizualizaci proudového pole
Flídr, Erik; Broučková, Zuzana; Pavelka, Miroslav; Trávníček, Zdeněk
2015 - English
Tato experimentální práce popisuje malý aerodynamický tunel pro vizualizaci proudového pole a kvantifikuje jeho hlavní parametry. Byla vyhodnocena rychlost proudění uvnitř měřicí oblasti pomocí několika experimentálních metod: - Anemometr se žhaveným drátkem - Videozáznam proudění - Měření rychlosti na výstupu z tunelu pomocí anemometru se žhaveným drátkem - Měření rychlosti na výstupu z tunelu pomocí Prandtlovy sondy - Průběžné měření rychlosti na výstupu z tunelu pomocí referenční Pitotovy sondy Byla prokázána možnost vizualizovat vybraný případ proudového pole, kterým je kruhový válec příčně obtékaný homogenním proudovým polem. This experimental work describes a small wind tunnel for flow field visualization and quantifies its main parameters. Velocity of fluid flow was evaluated by a few experimental methods: - Hot wire anemometry - Videorecord of flow - Velocity measurement at the outlet of the tunnel by hot wire anemometry - Velocity measurement at the outlet of the tunnel by Pitot tube - Continuous velocity measurement at the outlet of the tunnel using the reference Pitot tube Visualization of homogeneous flow field around a circular cylinder was shown.
Keywords:
fluid mechanics in general; mechanics of liquids (hydromechanics) – DT: 532; wind tunnels
Available at various institutes of the ASCR
Malý aerodynamický tunel pro vizualizaci proudového pole
Tato experimentální práce popisuje malý aerodynamický tunel pro vizualizaci proudového pole a kvantifikuje jeho hlavní parametry. Byla vyhodnocena rychlost proudění uvnitř měřicí oblasti pomocí ...
Optimization of Tie-Boss
Radnic, Tomáš; Luxa, Martin; Šimurda, David; Hála, Jindřich
2015 - English
Report contains results and analysis of the measurements on the mid section of a long turbine rotor blade equipped with two versions of a tie-boss damping device.
Keywords:
tie-boss; steam turbine; long blade
Available at various institutes of the ASCR
Optimization of Tie-Boss
Report contains results and analysis of the measurements on the mid section of a long turbine rotor blade equipped with two versions of a tie-boss damping device.
Measurements of elongation and untwisting of the blade 1220 mm in the testing station Campbell
Procházka, Pavel; Vaněk, František; Pešek, Luděk; Cibulka, Jan; Vaněk, Petr
2008 - English
A novel contactless measuring magneto-kinematic method based on the measurements of distances of magneto-resistive sensors from rotating blades was used for measurements of elongatin and untwisting of the blade 1220 mm in the testing station Campbell at Škoda Power, a.s. Results of these measurements are presented in the report. Nová bezkontaktní měřicí magneto-kinematická methoda založená na měření vzdálenosti magneto-resistivních senzorů od rotující lopatky byla použita pro měření prodloužení a rozkroucení lopatky 1220 mm na zkušebním stroji Campbell ve Škoda Power, a.s. Ve zprávě jsou prezentovány výsledky těchto měření.
Keywords:
blade; elongation; untwisting
Available at various institutes of the ASCR
Measurements of elongation and untwisting of the blade 1220 mm in the testing station Campbell
A novel contactless measuring magneto-kinematic method based on the measurements of distances of magneto-resistive sensors from rotating blades was used for measurements of elongatin and untwisting of ...
Detekce armovací tyče a vnitřní dutiny silnostěnného bloku laserovou vibrometrií
Trnka, Jan; Dvořáková, Pavla; Veselý, Eduard
2007 - English
Zpráva pojednává o detekci uměle vytvořených vad v betonovém bloku impakt-echo metodou. Ráz je generován ocelovou kuličkou a odezva na něj je snímána laservibrometrem. The report aims to detect artificially made fatigues in a concrete block by impact-echo method. The impact was generated by a steel ball and the response was detected by the laser vibrometer.
Keywords:
nondestructive testing; concrete; Laser vibrometer
Available at various institutes of the ASCR
Detekce armovací tyče a vnitřní dutiny silnostěnného bloku laserovou vibrometrií
Zpráva pojednává o detekci uměle vytvořených vad v betonovém bloku impakt-echo metodou. Ráz je generován ocelovou kuličkou a odezva na něj je snímána laservibrometrem....
Simulation of human voice production using FE model of the vocal tract
Horáček, Jaromír; Griffond-Boitier, F.
2004 - English
Finite element models of male vocal tract for Czech vowel /a/ are analyzed and used for numerical simulation of phonation. The models were designed from the MRI the subject during phonation. The acoustic signals for the vowel /a/ are simulated using the transient analysis. For excitation of the supraglottal spaces the intraglottal pressure or airflow rate generated by the aeroelastic model of vocal folds self-oscillations is used. The frequency and time response functions calculated near the lips and in front of the mouth are compared with acoustic measurements. Jsou analyzovány konečnoprvkové (MKP) modely mužského vokálního traktu pro českou samohlásku /a/. Tyto modely jsou použity pro numerické simulace fonace. MKP modely byly vytvořeny z dat magnetické rezonance získaných při fonaci subjektu. Akustické signály jsou simulovány v časové oblasti s použitím přechodové analýzy. Pro buzení vokálního traktu se využívá mezihlasivkového tlaku nebo objemového průtoku vzduchu generovaných aeroelastickým modelem samobuzeného kmitání lidských hlasivek. Odezvy ve frekvenční a časové oblasti jsou počítány v blízkosti rtů a před ústy člověka. Výsledky jsou porovnány s akustickými měřeními.
Keywords:
numerical simulation; vibroacoustics; biomechanics of human voice
Available at various institutes of the ASCR
Simulation of human voice production using FE model of the vocal tract
Finite element models of male vocal tract for Czech vowel /a/ are analyzed and used for numerical simulation of phonation. The models were designed from the MRI the subject during phonation. The ...
Vibration analysis of a thin circular plate influenced by liquid/gas interaction in an elastic cylindrical cavity
Horáček, Jaromír; Griffond-Boitier, F.
2003 - English
The study deals with the free vibration analysis of a cylindrical thick-walled cavity filled by a gas axially bounded at one end by a liquid interface and by a thin elastic disc at the other end. Numerical calculations performed are compared with theoretical solution and with the experimental results. The interaction between water and air in a rigid cavity was also studied. The influence of a compliance of the rigid cavity on the natural frequencies was taken into account for comparison with experimental data. Práce se zabývá vlastním kmitáním válcové tlustostěnné kavity naplněné nemísitelnou směsí plynu a kapaliny, vázaných podmínkami spojitosti v axiálním směru na společné hranici, a uzavřené na druhém konci tenkou elastickou deskou. Numerické výpočty jsou porovnány s teoreticko-analytickým řešením a s experimentálními výsledky. Studována byla i interakce mezi vodou a vzduchem uzavřených v tuhé válcové kavitě. Vliv poddajnosti tuhé kavity na vlastní frekvence systému bylo nutno vzít v úvahu při porovnání výsledku s experimentálními daty.
Keywords:
fluid-structure interaction; vibroacoustics; aero-hydroelasticity
Available at various institutes of the ASCR
Vibration analysis of a thin circular plate influenced by liquid/gas interaction in an elastic cylindrical cavity
The study deals with the free vibration analysis of a cylindrical thick-walled cavity filled by a gas axially bounded at one end by a liquid interface and by a thin elastic disc at the other end. ...
Acoustic emission and feature subset selection based on sensitivity analysis
Chlada, Milan; Mrázová, I.; Převorovský, Zdeněk
2001 - English
Technical report describes several methods of feature subset selection based on sensitivity analysis of neural networks.
Keywords:
acoustic emission
Available at various institutes of the ASCR
Acoustic emission and feature subset selection based on sensitivity analysis
Technical report describes several methods of feature subset selection based on sensitivity analysis of neural networks.
Thermophysical properties of ordinary water substance /KKE-20-2001
Mareš, R.; Šifner, Oldřich
2001 - English
The necessity of the replacement of IAPS-84 formulation with the new formulation IAPWS-IF97 is stressed in our report. Sources of the IF97 formulation, Steam Tables and software based on the new formulation are summarized. A proposal of Statement on t**computation of thermodynamic properties of ordinary (light) water substance is presented We presume that the Statement will be attached to the Report IAERA-TECDOC-949 or separately published in the data base of IAEA. News from the 2001 Annual IAPWS Me
Keywords:
thermophysical properties; ordinary water; voda; podstata
Available at various institutes of the ASCR
Thermophysical properties of ordinary water substance /KKE-20-2001
The necessity of the replacement of IAPS-84 formulation with the new formulation IAPWS-IF97 is stressed in our report. Sources of the IF97 formulation, Steam Tables and software based on the new ...
Implementation and futher application of refined transition prediction methods for turbomachinery and other aerodynamics flows. /Z - 1307
Jonáš, Pavel; Příhoda, Jaromír
2001 - English
The report deals with mathematical modelling and experimental investigation of the bypass transition in boundary-layer flows. The modelling of bypass transition is based on two-layer turbulence models and an algebraic intermittency model. The effect of velocity and length scales of free-stream turbulence on the onset and the end of the transition region for flat-plate boundary layer was investigated experimentally.
Keywords:
transition modelling; prediction methods; turbomachinery flows
Available at various institutes of the ASCR
Implementation and futher application of refined transition prediction methods for turbomachinery and other aerodynamics flows. /Z - 1307
The report deals with mathematical modelling and experimental investigation of the bypass transition in boundary-layer flows. The modelling of bypass transition is based on two-layer turbulence models ...
Static and dynamic calculations of two spinning rotors in permanent magnet combined suspension and with feedback controlled electromagnetic forces
Kozánek, Jan
2001 - English
The aim of the present report is the strength calculation of the two small rotors with given material constants for maximum speed and calculation of dynamic properties with regard of operational speed and danger of resonance oscillations.
Keywords:
rotor; permanent magnet; dynamic calculation
Available at various institutes of the ASCR
Static and dynamic calculations of two spinning rotors in permanent magnet combined suspension and with feedback controlled electromagnetic forces
The aim of the present report is the strength calculation of the two small rotors with given material constants for maximum speed and calculation of dynamic properties with regard of operational ...
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