High speed thermographic diagnostics of rotating parts of power equipment

Rotační díly patří mezi kritické komponenty energetických zařízení. Termografická diagnostika může včas odhalit jejich poškození a zabránit vážným škodám. Taková diagnostika je zpravidla možná pouze při běhu zařízení. Komplikací bývá také špatná přístupnost a vysoké rychlosti rotace, které znemožňují použití standardních termografických kamer s bolometrickým detektorem. Příspěvek je zaměřen na vysokorychlostní termografickou diagnostiku rotoru generátoru elektrárny. Je ukázán způsob použití vysokorychlostní termografické kamery na bázi kvantových detektorů s rychlostí vzorkování 1 kHz. Výstupy termografického měření jsou porovnány s výstupy měření kvantových infračervených detektorů o rychlosti vzorkování až 30 kHz. Jsou prezentovány výsledky diagnostiky rotoru a ukázány možnosti odhalení indikací poškození. Výsledky jsou porovnány s použitím bolometrické kamery s HD rozlišením a je prezentován význam integrační doby pro vysokorychlostní termografická měření.Práce vznikla za podpory projektu „LABIR-PAV / Předaplikační výzkum infračervených technologií“, reg. č.: CZ.02.1.01/0.0/0.0/18_069/0010018 financovaného z EFRR.Rotating parts belong to critical components of power devices. Thermographic diagnostics can predict their faults and prevent major failures. The diagnostics can be mostly performed only during an operation of the devices. A poor accessibility of the parts and their high speed of a rotation, which limits usability of standard bolometric infrared cameras, make such a diagnostics complicated. The contribution is focused on a thermographic diagnostics of a rotor of a power plant generator. A usage of a high-speed infrared camera, which is based on quantum detectors, with a frame-rate 1 kHz is presented. The thermographic measurements outputs are compared with high-speed infrared quantum detectors measurement results made with the sampling frequency 30 kHz. Results of the rotor diagnostics and possibilities of a detection of possible faults indications are introduced. The results are compared with a bolometric infrared camera with HD resolution results and a significance of an integration time for high-speed thermographic measurements is presented

Active thermography methods for predictive maintenance of power equipment

V příspěvku je představena aktivní termografie a její metody. Její možnosti využití jsou ukázány na příkladu inspekce ocelových stěn a příkladu hodnocení součástí při cyklickém zatížení. Jsou představeny možnosti využití lock-in a step/transient termografie s buzením pomocí halogenových lamp pro inspekci korozního úbytku ocelových stěn. Na druhém příkladu jsou ukázány možnosti využití termografie s rozšířeným vyhodnocením pomocí Fourierovy analýzy pro detekci poškození součástí při cyklickém zatížení.Active thermography and its approaches are introduced in this contribution. Possibilities of active thermography are demonstrated on two examples – inspection of steel walls and inspection of components at cyclic loading. Example of an inspection of a corrosion loss at rear side of steel walls by halogen lock-in and step/transient thermography is presented. Second example shows possibilities of thermography with an advanced evaluation using Fourier analysis for a damage inspection of a component under cyclic loading

Coating thickness evaluation by thermographic apparent effusivity method

Active thermography is a method for nondestructive inspection of materials. This contribution presents quantitative inspection of coating thickness by flash-pulse thermographic inspection and apparent thermal effusivity based evaluation. The apparent thermal effusivity algorithm for evaluation and visualisation of coating thickness is presented. The algorithm is based on a threshold value of the apparent effusivity, which can be found for any couple of substrate and coating if their effusivities differ. The square root of time at which the apparent effusivity curve reaches this threshold is then proportional to the thickness of the coating. Effectivity of the method is demonstrated by numerical model and experimental data obtained by inspection of Cr13%Fe thermally sprayed coatings made by twin wire arc spaying technology. A linear dependence between square root of apparent effusivity threshold time and couating thickness was found. Influence of the pulse length and presence of defects on the results are studied

Proceedings of the 12th International Conference on Kinanthropology

Proceedings of the 12th Conference of Sport and Quality of Life 2019 gatheres submissions of participants of the conference. Every submission is the result of positive evaluation by reviewers from the corresponding field. Conference is divided into sections – Analysis of human movement; Sport training, nutrition and regeneration; Sport and social sciences; Active ageing and sarcopenia; Strength and conditioning training; section for PhD students

History, Fiction and Ideology: Analysis of the Novel "The doubts of Salai"

This thesis analyzes the historical novel The Doubts of Salaí in terms of purpose, which the authors have clearly declared in the study attached to the novel. This purpose is both to ridicule the excessive confidence in the pulp and obvious fakes, and literary demythologization of myths - associated primarily with the Pope Alexander VI., Leonardo da Vinci, renaissance humanists or Tacit's Germania - which have settled in the historical discourse. Thus the thesis, through the narratological analysis, examines the procedures that are used within these purposes, and notes the implications for theories of the historical and literary discourses relationship. It also shows that in the final study the authors perpetrate historical objectivism and do not reflect the literariness of their own text. Powered by TCPDF (www.tcpdf.org)Tato práce analyzuje historický román Salaí má pochyby, a to z hlediska záměru, jež autoři jasně deklarují ve studii připojené k románu. Tímto záměrem je jednak zesměšnění přílišné důvěry v brak a v očividné falzifikáty, jednak literární demytologizace mýtů - zde spojená především s papežem Alexandrem VI., Leonardem da Vinci, renesančními humanisty či Tacitovou Germánií -, jež se usadily v historickém diskursu. Práce tedy prostřednictvím naratologické analýzy zkoumá postupy, které jsou v rámci těchto záměrů použity, a všímá si implikací pro teorie vztahu historického a literárního diskursu. Zároveň také ukazuje, že autoři se v závěrečné studii dopouštějí historického objektivismu a nereflektují literárnost vlastního textu. Powered by TCPDF (www.tcpdf.org)Department of Electronic Culture and SemioticsKatedra elektronické kultury a sémiotikyFakulta humanitních studiíFaculty of Humanitie

History, Fiction and Ideology: Analysis of the Novel "The doubts of Salai"

This thesis analyzes the historical novel The Doubts of Salaí in terms of purpose, which the authors have clearly declared in the study attached to the novel. This purpose is both to ridicule the excessive confidence in the pulp and obvious fakes, and literary demythologization of myths - associated primarily with the Pope Alexander VI., Leonardo da Vinci, renaissance humanists or Tacit's Germania - which have settled in the historical discourse. Thus the thesis, through the narratological analysis, examines the procedures that are used within these purposes, and notes the implications for theories of the historical and literary discourses relationship. It also shows that in the final study the authors perpetrate historical objectivism and do not reflect the literariness of their own text. Powered by TCPDF (www.tcpdf.org

Man a Machine - Descartes and La Mettrie

Liberal Arts and Humanities - Philosophical ModuleStudium humanitní vzdělanosti - Filosofický modulFakulta humanitních studiíFaculty of Humanitie

Thermal tomography based on time transformation

The contribution describes a new algorithm of thermographic evaluation of pulse thermography. The principle is in a time transformation of a thermographic sequence. The technique provides result in one image instead of series of images as standard algorithms do (FFT, TSR, derivation). This makes the evaluation faster and easier for the operator. The result can be sliced to ranges of depths, similar way as in tomography. Thereby, this technique is a part of the family of techniques often referred as thermal tomography. The algorithm is verified experimentally on a Flat Bottom Hole sample 3D-printed from ABS. The principle of slicing is described and showed on real experimental data. The advantages and disadvantages of this technique are discussed in this contribution

Flash pulzní termografie pro určení tloušťky nátěru

The contribution describes a fast contactless measurement of a paint thickness nonuniformity using flash pulse thermography. Specimens sprayed by a paint were thermally excited by a flash lamp and temperature responses were recorded by an infrared camera. The recorded sequences were post-processed with Fast Fourier Transform to obtain phase angles. Differences in the resulting images showed phase differences which corresponded to a paint thickness nonuniformity. Furthermore, the phases were correlated with the thickness by means of calibration curve so that the paint thickness could be determined with flash pulse phase thermography measurement. The method showed a promising potential in the contactless evaluation of the paint thickness. Average error of the thickness determination was less than 10 % for samples with paint thickness from 41 to 74 μm on AISI 304 substrate. Advantages, disadvantages and limitations of described method were discussed

Flash pulse phase thermography for a paint thickness determination

PING 2019 is organized with the support of funds for specific university research project SVK1-2019-002.The contribution describes a fast contactless measurement of a paint thickness nonuniformity using flash pulse thermography. Specimens sprayed by a paint were thermally excited by a flash lamp and temperature responses were recorded by an infrared camera. The recorded sequences were post-processed with Fast Fourier Transform to obtain phase angles. Differences in the resulting images showed phase differences which corresponded to a paint thickness non-uniformity. Furthermore, the phases were correlated with the thickness by means of calibration curve so that the paint thickness could be determined with flash pulse phase thermography measurement. The method showed a promising potential in the contactless evaluation of the paint thickness. Average error of the thickness determination was less than 10 % for samples with paint thickness from 41 to 74 μm on AISI 304 substrate. Advantages, disadvantages and limitations of described method were discussed