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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
411

Seismická analýza konstrukce s využitím residuálních tvarů / Seismic analysis of structure with residual modes

Včelný, Michal January 2021 (has links)
This thesis deals with the possibility of using the residual shape with help of the structural analysis software SCIA Engineer in the calculation of seismic load. Residual shape will be used in combination with CQC and SRSS calculation method, including different numbers of own shapes and the oscillated mass. In the last step, the results will be compared with each other.
412

Novel Characteristic-Mode-Based Synthesis and Analysis Method for Reflectarray Antennas

Maalik, Abdul 13 November 2020 (has links)
No description available.
413

Dynamická analýza ocelových nádrží s kapalinou / Dynamic analysis of steel tank with liquid

Farkasová, Zuzana January 2014 (has links)
Master´s thesis deals with dynamic analysis of steel tank with liquid. There are given parametres of structure and thein introduction to ANSYS system. There are created three numerical models for comparison, which are static and modal analysis calculated for. Spectrum analysis is calculated only for numerical models with fluid elements. Shell elements are evaluated according to EC 3.
414

Analýza formantů českých samohlásek generovaných nahlas a šeptem / Analysis of czech vowels to be generated aloud and in a whisper

Matug, Michal January 2008 (has links)
The modal and spectral characteristic belongs among important human acoustic spaces of vocal tract. They occur at generating vowels and other acoustic aspects of human speech. We can observe the resonant phenomena of acoustic cavity of vocal tract in the human speech spectrum, primary however at vowels generation. However near vocal tract occurs series of frequency tops in the spectrum of vowels, which necessarily may not be resonant origin. That is why sometimes quite difficult assign is right frequency tops to resonant tops of acoustic cavity. It consist in operate of acoustic excitation of vocal tracts. The pronounced of vowels loudly and in a whisper has different excitation of vocal tract. At generating vowels loudly is excited by scheme of harmonic components outspread to fundamental frequency of glottis. At talking in a whisper is vocal tract excited by continuous spectrum generated by turbulent fluxion of exhaled flatus over glottis. We give a name "formant" to a frequency, at which happens to resonance of acoustic space. Aim of this work is analysis of Czech vowels formants generated loudly and in a whisper. Experimental metering of these formants was performed on human vocalic tract for all vowels. Further then on artificially created vocalic tracts for vowels A, I. Then were modal characteristics of vocal cavity for vowels A, I, tested by method of final elements with the help of computing program ANSYS. In this work were surveyed courses of acoustic pressures for individual formants, influence sizes vocal tract and influence of correct mouth opening on formants. Also has been effected computational simulation of harmonic excitation on tract by side of glottis.
415

Výpočtové modelování funkce lidských hlasivek / Computational modelling of function of human vocal folds

Klíma, Jaromír January 2009 (has links)
Master thesis deals with creating of the numerical model of the human vocal folds. Calculation algorithm is designed to include vocal chordsinteraction with the air flow. Analysis of the results achieved by the numerical simulations and calculations are focused on the pressure and velocity conditions in the areas under vocal folds, between vocal folds and above vocal folds. Movement and stress analysis of individual layers of vocal folds has been made. This analysis is limited only for physiological health vocal folds without pathology and disease. Modal analysis of structural and acoustic environment, backround research of vocal folds function and summary of some published overviews of numerical models is part of this work.
416

Analýza mechanického chování synchronního generátoru / Analysis of mechanical behaviour of synchronous generator

Donát, Martin January 2010 (has links)
This Master’s thesis deals with analysis of mechanical behaviour of the synchronous generator and assessment of the possibility of reducing the mass of the frame of the generator. The aims of this work were: to perform the stress-strain analysis and modal analysis of the required model of the synchronous generator, to assessment influence of single part of the frame of the generator over its stiffness and design construction modification of the frame of the generator, which reduce its mass.
417

Dynamické vlastnosti výfukové soustavy a přenos hluku do kabiny osobního automobilu / Dynamic Characteristics of Exhaust System and Noise Transmition to the Car Cocpit

Novotný, Václav January 2010 (has links)
This thesis deals with the complex analysis of dynamic characteristics of the exhaust system and the transmission of noise from exhaust system to the vehicle. In the first part is performed modal analysis, which is compared to experimentally measured data. Modal analysis of the complete exhaust system is made with focusing on the influence of temperature of the exhaust system. There is also performed an analysis of noise transmission from exhaust system to the car cockpit.
418

Připojení vyvrtávacích hlav s CNC řízenou U-osou na horizontálních centrech Tajmac-ZPS / Boring and facing head with CNC U-axis interfacing on Horizontal machining centres Tajmac-ZPS

Nohál, Libor January 2010 (has links)
The subject of this thesis is a suggestion on mechanism for automatic interfacing of boring and facing heads with CNC U-axis on horizontal machining centres made in Tajmac-ZPS company. The thesis is terminated in modal analysis which is done in the point of view of the constructed boring head´s behaviour.
419

Stanovení druhé viskozity kapaliny z měřených tlakových pulsací. / Assessment of the second viscosity coefficient from measured pressure pulsations.

Černý, Ondřej January 2010 (has links)
Diploma thesis deals with problem of assessment of the second viscosity and acoustic velocity coefficients by the different liquid´s flow in pipe from measured pressure pulstation created by diaphragm pulsator. For the solution is used a transfer matrix model and for the data evaluation a genetic algorithm in „Facharp.exe“ program. Modal analysis in problematic part of the measured stand is realized to find a wave shapes and natural frequency of a pipe. The results are for the reason of clearness processed into „MS Excel“ program and fetched to the charts which shows depedence of a second viscosity and acoustic velocity coefficients on a various flow as the final result.
420

Výpočtové modelování interakce kmitajících hlasivek s proudem vzduchu / Computational modelling of interaction between oscillating vocal folds and air flow

Pavlica, Ondřej January 2011 (has links)
Master thesis deals with creating numerical model of the human vocal folds. Calculation algorithm includes interaction between vocal chords and the air flow. Modal analysis of structural and acoustic environment, backround research of vocal folds function and summary of some published overviews of numerical models are parts of this work. Analysis of the results achieved by the numerical simulations and calculations are focused on the pressure and velocity conditions in the areas under vocal folds, between vocal folds and above vocal folds. Movement and stress analysis of individual layers of vocal folds has been made. Impact of tissue thickness on resulting behaviour has been assessed.

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