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1
Mader, Daniel. "Měření výkonových parametrů zážehových motorů." Master's thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-259049.
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This thesis describes the various methods for measuring the performance parameters of petrol engines and on the selected engine (car) evaluate their accuracy with regard to the economic complexity of the methods.
In the first part of this thesis is described construction of combustion engines, explained the importance of individual performance parameters (power, torque, specific fuel consumpti-on) and characteristics combustion engines. This section, however, is focused on the issue of performance measurement, using both static and dynamic methods of measurement. The second part examined the various methods of measurement in practice on selected engine (car) with an assessment of their advantages and disadvantages and the financial cost of the-ir implementation.
2
Dvořák, Marek. "Metody měření výkonových parametrů vznětových motorů." Master's thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-259132.
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The thesis deals with the performance measurement of tractor engine through four used different methods. In the first theoretical part of thesis is analysis engine design with its main groups and the second part explains methods of measuring performance and measuring equipment. In the practical part of thesis is the explained methodology of applied methods of measurement, together with their evaluation. The first applied method is performance measurement on the dynamometer, the second method is measurement of these parameters during free acceleration, the third method is measurement of parameters during free acceleration with load and fourth method is measurement of parameters using GPS. In conclusion of this part is to compare the results of each used measurement methods between themselves and the conclusions drawn from it.
3
Vaňatka, Marek. "Statické a dynamické vlastnosti nanostrukturovaných magnetických materiálů." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2021. http://www.nusl.cz/ntk/nusl-438773.
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Magnetické materiály a z nich vyrobené nanostruktury jsou v průběhu posledních let studovány pro jejich aplikace v např. záznamových médiích a logických obvodech. Tato práce navazuje na náš předchozí výzkum tohoto oboru s hlavním zaměřením na statické a dynamické vlastnosti nanostrukturovaných magnetických materiálů, jako například NiFe, CoFeB a YIG. Práce začíná teoretickým úvodem s popisem mikromagnetických systémů, dynamiky magnetických vortexů, feromagnetické rezonance (FMR) a spinových vln včetně jejich disperzních vlastností. Následuje popis použitých experimentálních metod a první experimentální část zabývající se nukleačním procesem magnetického vortexu, jinými slovy procesem transformace ze saturovaného stavu do spinové konfigurace magnetického vortexu v průběhu snižování magnetického pole. Jsou použity mikroskopické metody zobrazující magnetickou strukturu materiálu, jmenovitě Lorentzova transmisní elektronová mikroskopie a rentgenová transmisní mikroskopie. Výsledky jsou poté korelovány s měřením elektrické odezvy pomocí jevu anizotropní magnetorezistence. Výhodou elektrických měření je, že plně elektrická detekce dovoluje použití tohoto systému v uzavřených systémech integrovaných obvodů. Výsledky oblasti nukleací magnetických vortexů ukazují, že při tomto procesu prochází magnetizace v nano- a mikrometrových magnetických discích několika fázemi s růsnými typy spinových konfigurací nazvaných nukleační stavy. Dále je představeno měření magnetických materiálů pomocí vektorového síťového analyzátoru (VNA), což je aplikováno na měření resonance magnetických vortexů (určení gyrotropické frekvence a měření vysokofrekvenčních módů), feromagnetické rezonance tenkých vrstev (získání základních magnetických materiálových parametrů) a spektroskopii spinových vln. Právě spektroskopie spinových vlna je rozvinuta za účelem měření disperzních relací tenkých magnetických vrstev, což je základní charakteristika, jejíž znalost je důležitá v návrhu aplikací. Nakonec je představeno anténní zařízení, díky kterému lze oddělit magnetické buzení od vzorku samotného bez nutnosti absolvovat proces elektronové litorafie, což je zapotřebí v klasickém přístupu antény na vzorku a kontaktování vysokofrekvenční sondou. Toto zařízení se skládá ze skleněného kantilívru, na kterém je vyrobena budící anténa, konektoru a spojovacího prvku v podobě plošného spoje. Celé zařízení je díky umístění na x-y-z stolek s náklonem pozicovatelné a lze tedy měřit v jakémkoliv místě vzorku. Umístění antény na sklo umožňuje navigaci pomocí mikroskopu a optické měření, např. metodou Brillouinova světelného rozptylu (BLS) nebo Kerrova jevu.
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Valíček, Jan. "Statické a dynamické posouzení konstrukce vyhlídkové věže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226476.
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This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.
5
Tesař, Michal. "Dynamické parametry sportovního a konvenčního vozidla." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382225.
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This master´s thesis is focused on chosen dynamic parameters of a sport vehicle represented by student formula Dragon 7 and comparison of these parameters with conventional vehicles represented by two exemplars of ŠKODA Superb III. Driving tests used for the comparison are simulating the real driving situations from the roads in order to possibly use those for the road accident analysis in the future. All the measurements were taken under lower adhesion conditions which might help solving of the road accidents under such conditions in the future. There is also a description of vehicle driving systems and components which have an influence on the vehicle´s driving dynamics incorporated in the thesis.
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Štekbauer, Hynek. "Vypracování algoritmu a příslušného programového modulu pro statické a dynamické řešení lan na kladkách." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227641.
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The goal of this master thesis is to develop an algorithm for solving cables on pulleys, which would be more efficient and accurate than existing algorithm used in software RFEM. This algorithm was integrated to the program for static and dynamic analysis of structures, in the form of particular program module. This work also contains examples of using this algorithm. The comparison of expected results with outcomes from the program is presented. The suitability for common practise is examined based on this comparison. The examples showed that the new algorithm for solving of cables on pulleys is more powerful and more accurate than existing solutions and most likely does not has equivalent competition.
7
Hartmanová, Věra. "Analýza investiční příležitosti." Master's thesis, Vysoká škola ekonomická v Praze, 2007. http://www.nusl.cz/ntk/nusl-77260.
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Práce se zabývá analýzou ekonomické efektivnosti investice do výroby elektrické energie spalováním bioplynu. V teoretické části popisuje problematiku investičního rozhodování v podniku. Dále se zabývá metodami hodnocení efektivnosti investic. V praktické části se věnuje vyhodnocení investice do výstavby bioplynové stanice. Zaměřuje se na vliv struktury financování investice na čistou současnou hodnotu a návratnost investice. Pozornost je věnována citlivosti investice na změnu v nákladech a výnosech.
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Novotný, Václav. "Dynamické vlastnosti výfukové soustavy a přenos hluku do kabiny osobního automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229108.
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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.
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Wittkugel, Andrew E. "From static to dynamic: an investigation of flexible architecture." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337286972.
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Grachek, Adam. "Individualized Pedestrian and Micromobility Routing Incorporating Static and Dynamic Parameters." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177784.
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This project seeks to demonstrate routing optimization that would allow pedestrian and micromobility user groups to select and prioritize different route features according to their preferences. Through the creation of a routing demonstrator that considers both static and dynamic parameters in the form of pavement quality, elevation climb, travel time, and air quality, along with user-specified weights for their prioritization of each of these parameters, a number of routes were created and mapped to qualitatively compare against routes representing only a shortest path.<br><p>Examensarbetet är utfört vid Institutionen för teknik och naturvetenskap (ITN) vid Tekniska fakulteten, Linköpings universitet</p>
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Afolabi, Jamiu Lanre. "The performance of a static coal classifier and its controlling parameters." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/11078.
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In power generation from solid fuel such as coal-fired power plants, combustion efficiency can be monitored by the loss on ignition (LOI) of the pulverised fuel. It is the role of the pulveriser-classifier combination to ensure pulverised fuel delivered to the burners is within the specified limits of fineness and mass flow deviation required to keep the LOI at an acceptable level. However, government imposed limits on emissions have spurred the conversion of many coal fired power plants to convert to the use of Low NOx Burners. To maintain good LOI or combustion efficiency, the limits of fineness and mass flow deviation or inter-outlet fuel distribution have become narrower. A lot of existing pulveriser units cannot operate efficiently within these limits hence retrofits of short term solutions such as orifice balancing and classifier maintenance has been applied. The work performed in this thesis relates to an investigation into coal classifier devices that function to control fineness and inter pipe balancing upstream of the burner and downstream of the pulverisers. A cold flow model of a static classifier was developed to investigate the flow characteristics so that design optimisations can be made. Dynamic similarity was achieved by designing a 1/3 scale model with air as the continuous phase and glass cenospheres of a similar size distribution as pulverised fuel, to simulate the coal dust. The rig was operated in positive pressure with air at room temperature and discharge to atmosphere. The Stokes number similarity (0.11-prototype vs. 0.08-model) was the most important dimensionless parameter to conserve as Reynolds number becomes independent of separation efficiency and pressure drop at high industrial values such as 2 x 10 4 Hoffman, 2008). Air-fuel ratio was also compromised and an assumption of dilute flow was made to qualify this. However, the effect of air fuel ratio was ascertained by its inclusion as an experimental variable. Experiments were conducted at air flow rates of 1.41-1.71kg/s and air fuel ratios of 4.8-10 with classifier vane angle adjustment (30°- 60°) and inlet swirl umbers (S) of 0.49 – 1. Radial profiles of tangential, axial and radial velocity were obtained at several cross sections to determine the airflow pattern and establish links with the separation performance and outlet flow balance. Results show a proportional relationship between cone vane angle and cut size or particle fineness. Models can be derived from the data so that reliable predictions of fineness and outlet fuel balance can be used in power stations and replace simplistic and process simulator models that fail to correctly predict performance. It was found that swirl intensity is more significant a parameter in obtaining balanced flow at the classifier outlets than uniform air flow distribution in the mill. However the latter is important in obtaining high grade efficiencies and cut size. The study concludes that the static classifier can be further improved and retrofit-able solutions can be applied to problems of outlet flow imbalance and poor fineness at the mill outlets.
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Štencl, Michal. "Bezpečnostní parkovací brzdy pro servomotory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318158.
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This Master thesis is focused on electromagnetic brakes for servomotors. In the first chapter is described principle of operation, later then design and main parameters are explained. The main part of thesis is focused on calculation of dynamic parameters of electromagnetic brakes. Calculations are solved first by analytic method in Matlab–Simulink, then by finite element analysis. Results are compared with measurements on prototype brake.
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Hanni, M. (Matti). "Static and dynamic NMR properties of gas-phase xenon." Doctoral thesis, University of Oulu, 2011. http://urn.fi/urn:isbn:9789514294570.
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Abstract
This thesis presents computational studies of both the static and dynamic parameters
of the nuclear magnetic resonance (NMR) spectroscopy of gaseous xenon.
First, state-of-the-art static magnetic resonance parameters are computed in small
xenon clusters by using methods of quantum chemistry, and second, time-dependent
relaxation phenomena are investigated via molecular dynamics simulations
at different experimental conditions. Based on the underlying quantum and
classical mechanics concepts, computational methods represent a procedure complementary
to experiments for investigating the properties of atoms, molecules,
clusters and solids.
Static NMR spectral parameters, chemical shift, shielding anisotropy and asymmetry
parameter, nuclear quadrupole coupling, and spin-rotation coupling, are
calculated using different electronic structure methods ranging from the uncorrelated
Hartree-Fock method to correlated second-order Møller-Plesset many-body
perturbation, complete/restricted active space multiconfiguration self-consistent
field, and to coupled-cluster approaches. The bond length dependence of these
properties is investigated in the xenon dimer (Xe2). A well-characterized property
in experimental NMR, the second virial coefficient of nuclear shielding, is
theoretically calculated by a variety of methods and convincingly verified against
experimental findings. Here, it is mandatory to include effects from special relativity
as well as electron correlation. As a side result, a purely theoretical potential
energy curve for Xe2, comparable to best experimental ones, is calculated.
A pairwise additive scheme is established to approximate the NMR properties in
differently coordinated sites of xenon clusters Xen (n = 2 - 12). Especially the
pairwise additive chemical shift values are found to be in close agreement with
quantum-chemical results and only a small scaling factor close to unity is needed
for the correct behavior. Finally, a dynamical magnetic resonance property, the
experimental nuclear spin-lattice relaxation rate R1 of monoatomic Xe gas due to
the chemical shift anisotropy (CSA) mechanism is validated from first principles.
This approach is based on molecular dynamics simulations over a large range of
temperatures and densities, combined with the pairwise additive approximation
for the shielding tensor. Therein, the shielding time correlation function is seen
to reflect the characteristic time scales related to both interatomic collisions and
cluster formation. For the first time, the physics of gaseous xenon is detailed in
full in the context of CSA relaxation.
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SANTOS, RODRIGO BIANCHI. "PARAMETRIC OPTIMIZATION OF TRUSS STRUCTURES UNDER DYNAMIC LOADING USING THE EQUIVALENT STATIC LOAD METHOD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35802@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Otimização estrutural sujeita a carregamentos dinâmicos é um problema desafiador em vários aspectos, a começar pelo grande número de restrições que devem ser atendidas em todos os instantes de tempo. Além
disso, o custo computacional para avaliar os gradientes destas restrições é bastante elevado e requer um grande espaço de armazenamento. Na literatura, alguns métodos reduzem o número de restrições avaliando em instantes de tempo selecionados, como o pior caso por exemplo, ou ainda constroem um funcional equivalente, integrando as restrições violadas ao longo do tempo, assim eliminando essa dependência. Nesta dissertação, o método do Carregamento Estático Equivalente (ESL) é utilizado, no qual
o problema dinâmico original é transformado em uma sequência de subproblemas de otimização linear estática com múltiplos casos de carga. Um atrativo deste método é a possibilidade da solução de problemas não lineares, evitando o alto custo devido às repetidas análises estruturais e cálculos das restrições. Problemas clássicos de treliças planas submetidas a carregamentos dinâmicos são resolvidos utilizando o método ESL. A função a ser minimizada é a massa da treliça, que está sob restrições de tensão e deslocamento, onde as variáveis de projeto são as áreas da seção transversal dos membros. Além disso, uma interface utilizando ANSYS e MATLAB é desenvolvida para uma abordagem modular, na qual a análise via elementos finitos e a otimização possam ser realizadas separadamente. Este processo viabiliza a otimização de estruturas que apresentam comportamentos não lineares a partir da utilização de diversos softwares comerciais disponíveis no mercado.<br>Structural optimization subject to dynamic loading is a challenging problem in many aspects, starting with the large number of constraints that must be respected at all instants of time. Furthermore, the computational cost to evaluate the gradients of these constraints is significantly high and requires a large storage space. In the literature, some methods reduce the number of constraints evaluating at selected instants of time, such as the worst case. Alternatively, a single equivalent functional is constructed to eliminate the time dependence by integrating the violated constraints over time. In this work, the Equivalent Static Load (ESL) method is used, in which the original dynamic problem is reduced into a number of static linear optimization problems with multiple load cases. An attractive feature of this method is the possibility of solving non-linear problems, avoiding the high cost due to repeated structural analyzes and constraint calculations. Classical problems of plane trusses subjected to dynamic loads are solved using the ESL method. The function to be minimized is the truss mass, which is subjected to stress and displacement constraints, where the design variables are the cross-sectional areas of the members. In addition, an interface using ANSYS and MATLAB was developed for a modular approach, in which finite element analysis and optimization can be performed separately. This process makes possible the optimization of structures that present non-linear behavior from the use of most structural analysis software packages available on the market.
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Bapat, Amey Vivek. "Influence of Bridge Parameters on Finite Element Modeling of Slab on Girder Bridges." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/36105.
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The present study is part of the Long Term Bridge Performance Program (LTBP) funded by the Federal Highway Administration. The objectives of this program are to create a comprehensive database of quantitative information of the long-term performance of selected pilot bridges and to develop a methodology to assess bridge performance. Finite element (FE) modeling of the pilot bridges is an intrinsic part of the LTBP program and is intended to not only assist with instrumentation decisions, but also to provide further insight into the behavior of these bridges, which cannot be achieved solely from field testing of the bridges. This thesis provides a comprehensive study of a plethora of issues associated with the development of reliable and accurate FE models of bridges.
The first objective of this investigation was to develop reliable finite element models with a variety of levels of refinement and to study the effect of the inclusion of various bridge parameters in the model, such as bridge skew, degree of composite action, thermal gradient and level of support restraint, on the response of bridges. First, the suitability of different modeling techniques and of elements used to model the primary bridge components was assessed using simple models for which analytical solutions are readily available. From these studies, it was concluded that shell elements are adequate to model the bridge deck, and beam and shell elements are both satisfactory to model the bridge girders. From the dynamic analyses of theWildcat Creek River Bridge and the Colquitz River Bridge, flexural modes of vibration were found to be highly sensitive to support restraints and to how the guardrails were modeled and less sensitive to the inclusion of bracing and thermal gradients in the model. The finite element models using extreme boundary conditions were successful in bracketing the field response. The factors identified from these analyses were considered in the analysis of the Virginia pilot bridge. Different support restraints, and the inclusion of skew and level of composite action in the model had noticeable impact on both the static and dynamic responses of the bridge. The results from these analyses were used to assist with instrumentation decisions prior to field-testing. The developed model will also be used to help researchers further understand the bridgeâ s behavior and to help explain a variety of phenomena observed in the field.<br>Master of Science
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Sandell, Viktor. "Extraction of Material Parameters for Static and Dynamic Modeling of Carbon Black Filled Natural Rubbers." Thesis, Luleå tekniska universitet, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65583.
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Volvo Car Corporation (Volvo Cars) develops powertrain mounting systems that uses components made up largely of filled rubber materials. The development of such components is today relying on external suppliers to design components based on requirements set by Volvo. To reduce costs and lead-time in the development process the possibility of in-house design of such components at Volvo Cars is being investigated. For this to be possible, knowledge must be built concerning modelling the mechanical properties of rubber materials. As part of this a parameter extraction method for modelling of filled rubber materials intended for finite element use has been developed in this project. Both a simple static model fitting procedure and a more complex dynamic model fitting procedure are detailed. Mechanical testing of four filled natural rubber materials with varying hardnesswas carried out at the facilities of Volvo Cars and recommendations have been made regarding the limits of the equipment and the specific test body geometry used. It was found that the lower limit for dynamic testing in regards to displacement amplitude is 0.02 mm. The highest frequency recommended is dependent on the material hardness but a higher limit of 200 Hz is recommended for the softest material investigated. The upper limit was found to be necessary due to inertia effects in the material. The models used to describe the static behaviour were hyperelastic phenomenological models independent on the second invariant such as the Yeoh and the linear neo-Hookean models. The dynamic model used the overlay method to capture therate and amplitude dependent properties of filled rubber. A generalized viscoelastic-elastoplastic rheological model using Maxwell and friction elements in parallel with alinear elastic element was presented and used. These were limited to having maximumfive of each element and no attempts at minimizing this number was made in this work.The dynamic model was fitted to experimental data using a minimization procedure focusing on dynamic modulus and damping at a range of frequencies and strain amplitudes.The proposed fitting procedure is a three segment loop in which FE simulationsof the experimental data is used as both a correction and a validation tool.Model validation showed good correlation of the fitted model to measured databefore correction was attempted. The correction step did not improve the model qualityand the reason for this was identified as poor post-processing. The proposed method together with lessons learned during the course of the project will be of importance for the future in-house development of rubber components at Volvo Cars.
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Boberg, Frida. "Simulation of dynamic and static behavior of an electrically powered lift gate." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11627.
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<p>Continental Automotive Systems is a German company that develops control systems for different applications in cars. A control system for electrically powered lift gates that are opened or closed on the driver’s command is one of the products developed. The drive system itself is composed of a spindle that is driven by a DC-motor over a gear and a spring. When developing the control system it is convenient to use a simulation model instead of having to implement it on the system every time. The simulation analytically describes how the system is behaving.</p><p>In this thesis a simulation model of a drive system and a lift gate is developed and evaluated. The model parameters are estimated using System Identification Toolbox in Matlab.</p><br><p>Continental Automotive Systems är ett tyskt företag som utvecklar styrsystem för olika tillämpningar i bilar. Bland annat utvecklas ett styrsystem till eldrivna bakluckor som öppnas och stängs av föraren per knapptryck. Själva drivanordningen består av en skruv som drivs av en likströmsmotor över en utväxling och en fjäder. Då man vill utveckla styrsystemet utan att behöva implementera det på systemet varje gång är en simuleringsmodell av drivanordningen och luckan ett bra hjälpmedel. Denna simuleringsmodell kan då analytiskt beräkna hur systemet uppför sig.</p><p>I detta examensarbete har en simuleringsmodell av en drivanordning med tillhörande lucka utvecklats och utvärderats. Modellparametrarna estimerades med hjälp av System Identification Toolbox i Matlab.</p>
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Faez, Elias Feras. "Estimation of Inertial Parameters for Automatic Leveling of an Underwater Vehicle." Thesis, Linköpings universitet, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140188.
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The use of underwater systems has grown significantly, and they can be used both for military and civilian purposes. Many of their parts are replaceable. An underwater vehicle can be equipped with different devices depending on the taskit should carry out. This can make the vehicle unbalanced, which means that the demand for balancing systems will increase in line with the increasing use of underwater systems. The goal of the thesis is to deliver a method for balancing based on parameters estimated both in static and dynamic operation. The parameters define a nonlinear physical model that can describe the underwater vehicle in different environments and conditions. The main idea in the proposed method for parameter estimation based on static operation data is to solve equilibrium equations when the on-board control system is used to maintain two different orientations. The balancing can then be done by solving an optimisation problem that gives information about where additional weights or float material should be installed. The static parameter estimation has been evaluated successfully in simulations together with three ways of solving the balancing problem. The dynamic parameter estimation has also been evaluated in simulations. In this case, the estimated parameters seem to have the same sign as the true ones but it seems difficult to obtain accurate estimates of some of the parameters. However, the total dynamic model was good except the prediction of the vertical movements. In particular, the model could explain the rotations of the vehicle well. The reason for the worse performance for the vertical movements might be some difficulties when generating suitable excitation signals. The work done by Feras Faez Elias in connection to this master thesis made a contribution to a patent application that Saab AB has filed where Feras Faez Elias was one of the inventors.
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Algassem, Omar. "Parameters Affecting the Blast Performance of High Strength Fibre Reinforced Concrete Beams." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35022.
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A limited number of studies have been conducted in the literature in order to investigate the behaviour of high-strength fibre-reinforced concrete (HSFRC) structural components subjected to blast loads. This study summarizes the results of a research program investigating the potential of using steel fibres to improve the blast performance of high-strength reinforced concrete beams. As part of the experimental investigation twenty beams were tested, including nine beams tested under static four-point bending, and eleven beams tested under dynamic blast loads using a shock-tube. Parameters considered in the study include the effect of concrete strength, steel fibres, fibre content, fibre type, longitudinal reinforcement ratio, and presence of shear reinforcement. All beams in the study have identical dimensions, with a cross-section of 125 x 250 mm and length of 2440 mm. To manufacture the specimens, two beams were cast with normal-strength self-consolidate concrete (SCC), with a specified strength of 50 MPa, while the remaining beams were cast with either plain or fibre-reinforced high-strength concrete having a compressive strength which varied between 95-110 MPa. The steel fibre content in the HSFRC beams varied between 0.5 and 1.0%, by volume of concrete. To investigate the effect of reinforcement ratio (ρ), the beams were reinforced with 2-#4 (American size) bars, 2-15M bars or 2-20M bars (ρ = 1.02%, 1.59%, and 2.41%, respectively). The majority of the plain concrete beams had transverse reinforcement which consisted of 6 mm stirrups arranged at a spacing of 100 mm in the shear spans, while most of the HSFRC beams were built without stirrups. The results indicate that all the parameters in this study (reinforcement ratio, presence of stirrups, concrete strength, steel fibres, fibre content and fibre type) affected the static and blast response of the beams, however, the results demonstrate that steel fibres have a more remarkable effect when compared to the other parameters. The provision of fibres is found to improve the blast performance of the HSC beams by increasing shear capacity, reducing maximum and residual mid-span displacements, reducing blast fragments and increasing damage tolerance.
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Marková, Lucie. "Hodnocení investičního projektu fotovoltaické elektrárny." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-73961.
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This thesis is divided into three chapters. The first chapter defines the objective of the work. The second section summarizes the theoretical and methodological part. Theoretical and methodological part deals with analysis of the area, preparation and implementation of the project, methods of evaluating investment and defines a project risk. The third part is the part of the application. It is about putting theoretical knowledge into practise. The third chapter contains an analysis of the area, description of the company, economic valuation and asessment of investment risk.
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Köcher, Simone Swantje [Verfasser], Josef [Akademischer Betreuer] Granwehr, and Arne [Akademischer Betreuer] Lüchow. "Simulation of static and dynamic magnetic resonance parameters for solid mixed conductors / Simone Swantje Köcher ; Josef Granwehr, Arne Lüchow." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1193734746/34.
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Podolník, Adam. "Experimentální analýza dynamických parametrů kolejového roštu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226628.
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In terms of deciding on the appropriate use of the railway superstructure assemblies in both the recommendations arising from the theoretical analysis (modeling), as well as recommendations obtained under static and dynamic testing of the finished product play an important role. Such tests can then be applied in the laboratory or in the field. The thesis will be devoted to operational testing of selected track grid structures in situ. For measurement purposes an appropriate measuring point will be chosen and the methodology of measurement will be proposed. In terms of track geometry sections in curves will be selected. On the basis of tests carried out dynamic parameters of structures will be determined. To their evaluation suitable mathematical system will be chosen. It assumes the use of mathematical methods in time and frequency areas. In the thesis there will also be a comparison of the parameters of the tested structures. Based on the measurements it will be a source of recommendations for the practice.
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Šebedovský, Richard. "Prostředky teorie her v ekonomickém rozhodování." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2012. http://www.nusl.cz/ntk/nusl-223545.
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Tato práce se zabývá současnými trendy v aplikaci teorie her k tvorbě ekonomických modelů, které se následně využívají při ekonomickém rozhodování s podporou prostředků informatiky. Práce se zejména opírá o poznatky teorie statických a dynamických her a her s dokonalými a nedokonalými informacemi. Zkoumány jsou modely týkající se sdílení zdrojů, aukcí a managementu. Pro každý z popsaných modelů je prezentována konkrétní aplikace.
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Quispe, Ledesma Fredy. "Análisis y diseño estructural comparativo con la norma sismo resistente E.030-2014 vs. E.030-2003 de un edificio multifamiliar de 5 pisos en Distrito de Surquillo." Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1337.
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El presente trabajo tiene por objetivo Realizar el diseño estructural con el proyecto de norma de diseño sismo resistente E.030-2014 y compararla con la a la E.030-2003 para comprobar sus ventajas e incidencia en el diseño de
un edificio de cinco pisos destinados a multifamiliar, esta comparación se realizará durante el análisis sísmico del edificio, aplicando y comparando los parámetros de cada una de estas norma simultáneamente, para de esa manera comparar los resultados de las solicitaciones que producen a la hora de realizar el diseño estructural , también verificar en que porcentaje varían estas dos demandas y si este influye económicamente en la concepción de los planos estructurales del proyecto así como la influencias de los nuevos parámetros en el comportamiento sísmico del edificio en conjunto.
La metodología a utilizar para el desarrollo de esta tesis es del tipo cuantitativo nivel descriptivo y de método diseño experimental y explicativo, longitudinal y prospectivo. .
El proyecto que se utilizara para la comparación y el diseño estructural, se ubica en la ciudad de Lima en el distrito de Surquillo, sobre un terreno de 503.63m2 de área. El suelo está constituido de la grava típica de la ciudad de Lima, con un esfuerzo admisible (Capacidad Portante) del terreno de 4Kg. /cm2 a 1.30 m. de profundidad.
Después haber realizar toda las etapas de diseño y enfocándonos en el análisis sísmico comparativo con las dos versiones de la norma E.030 obtenemos resultados muy próximos la diferencia de demanda sísmica está en el orden del 1%-6% y por eso a la hora de diseñar con los resultados de cualquiera de las dos versiones de la norma E.030, no causa problema desde el punto de vista económico. También se observa que hay parámetro que limitan la irregularidad en el edificio y mejoran el comportamiento sísmico de este.
Se finaliza con la elaboración de los planos estructurales de todo el edificio que es uno de los objetivos fundamentales de esta investigación.
This paper aims to Perform structural design with the draft of E.030-2014 earthquake resistant design and compare it with the E.030-2003 to check their benefits and impact on design
a five-story building intended for multifamily, this comparison will take place during the seismic analysis of the building, using and comparing the parameters of each of these standards simultaneously, to thereby compare the results of the stresses that occur when making structural design, also check that these two percentage varying demands and economically if it influences the design of structural drawings of the project as well as the influences of the new parameters on the seismic behavior of the building as a whole.
The methodology used to develop this thesis is the quantitative level and descriptive and explanatory experimental, longitudinal and prospective design method. .
The project to be used for comparison and structural design, is located in the city of Lima in the district of Surquillo, on a land of 503.63m2 area. The floor is made of the typical gravel Lima, with allowable stress (bearing capacity) 4 kg terrain. / Cm2 to 1.30 m. deep.
After having performed all stages of design and focusing on the comparative seismic analysis with two versions of the E.030 standard we get very close results the difference of seismic demand is in the order of 1% -6% and that at the time design with the results of either the E.030 standard versions, causes no problem from the economic standpoint. It is also noted that there are parameters that limit the irregularity in the building and improve the seismic performance of this.
It ends with the development of structural plans of all the building that is one of the key objectives of this research.
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Vojtěšek, Aleš. "Měření odklonu kola během jízdy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231779.
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The subject of this master's thesis is design measurement and measure change wheel camber angle during driving. For this task were used parts from Corrsys-Datron and remaining elements needed to be manufactured. With complete system measurements were done and outputs data were displayed by Matlab and evaluated. Based on data evaluation is possible exactly determine relative position of the wheel to the road surface and to the body of vehicle.
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Jelínek, Michal. "Hodnoceni investičního záměru." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2017. http://www.nusl.cz/ntk/nusl-319197.
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The diploma thesis focuses on complex economic evaluation of the investment project regarding the purchase of machining centre. Based on the elaborated literature review are those findings applied to the real investment project. Economic efficiency is calculated using the identified cash flows, discount rate and static and dynamic methods. Subsequently are identified project risks and their significance. In conclusion, the results are summarized and is reported recommendation whether or not to implement the project.
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Siddiqui, Asher. "Capturing JUnit Behavior into Static Programs : Static Testing Framework." Thesis, Linnaeus University, School of Computer Science, Physics and Mathematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-5510.
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<p>In this research paper, it evaluates the benefits achievable from static testing framework by analyzing and transforming the <em>JUnit3.8 </em>source code and static execution of transformed code. Static structure enables us to analyze the code statically during creation and execution of test cases. The concept of research is by now well established in static analysis and testing development. The research approach is also increasingly affecting the static testing process and such research oriented work has proved particularly valuable for those of us who want to understand the reflective behavior of <em>JUnit3.8 Framework</em>.</p><p><em> JUnit3.8 Framework</em> uses <em>Java Reflection API</em> to invoke core functionality (test cases creation and execution) dynamically. However, <em>Java Reflection API</em> allows developers to access and modify structure and behavior of a program. Reflection provides flexible solution for creating test cases and controlling the execution of test cases. Java reflection helps to encapsulate test cases in a single object representing the test suite. It also helps to associate each test method with a test object. Where reflection is a powerful tool to perform potential operations, on the other hand, it limits static analysis. Static analysis tools often cannot work effectively with reflection.</p><p>In order to avoid the reflection, <em>Static Testing Framework</em> provides a static platform to analyze the <em>JUnit3.8</em> source code and transform it into non-reflective version that emulates the dynamic behavior of <em>JUnit3.8</em>. The transformed source code has possible leverage to replace reflection with static code and does same things in an execution environment of <em>Static Testing Framework</em> that reflection does in <em>JUnit3.8</em>. More besides, the transformed code also enables execution environment of <em>Static Testing Framework</em> to run test methods statically. In order to measure the degree of efficiency, the implemented tool is evaluated. The evaluation of <em>Static Testing Framework</em> draws results for different Java projects and these statistical data is compared with <em>JUnit3.8</em> results to measure the effectiveness of <em>Static Testing Framework</em>. As a result of evaluation, <em>STF</em> can be used for static creation and execution of test cases up to <em>JUnit3.8</em> where test cases are not creating within a test class and where real definition of constructors is not required. These problems can be dealt as future work by introducing a middle layer to execute test fixtures for each test method and by generating test classes as per real definition of constructors.</p>
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Simms, Christine. "Process optimisation using design experiments and some of the principles of Taguchi : resolving multi-criteria conflicts within parameter design in static and dynamic processes." Thesis, University of Ulster, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247675.
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Pavelka, Tomáš. "Provozní vlastnosti LED a jejich modelování." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-263352.
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Doctoral thesis deals with parameters of LED light sources and their static and dynamic changes due to variable operational conditions. Firstly there is briefly described the history of light emitting diodes, that brought LED from unintentional observation of luminescence to light source, which is generally used through the whole area of lighting techniques. Thesis focuses on light parameters analysis, which are specific for semiconductor light sources and their mutual relations. These relations in compliance with understanding the principles of light emission in semiconductor light sources enable establishing of basic connections and effects usable for LED behaviour model. Mutual relations of LED parameters and influencing factors are verified by measurement of chosen testing samples. For deeper understanding of diode parameter influencing mechanisms there are analysed current degradation models including degradation of partial components. On the basis of these facts there is created a model of LED luminaire operating with LED parameters together with cooling system that represent the integral part of the luminaire. Impact of supply drivers is also studied, because they are necessary for LED operation. Designed model supports the area of static changes of light parameters, as well as the dynamic changes of output parameters. Presented model is verified by testing measurements at basic operational states and partially outside of the common operational limits. There are also presented the possibilities of real use of the model that involve the evaluation of designed luminaire for specific light sources, searching for optimal operational limits, optimization of luminaire heatsink or using public lighting systems for regulation of electricity grid load fluctuations.
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Balák, Dušan. "Analýza statického a dynamického namáhání stávající rozvodny 110 kV pro zvýšení zkratové odolnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242033.
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This thesis is concerned with static and dynamic stress calculation of busbar and wire conductors in HV and EHV substations according to standards ČSN EN 60865-1 ed. 2 and ČSN EN 50341-1 ed. 2. Calculations are done in program made in MS Excel with consideration to corporate regulations of energetics. In introduction is described the construction of HV substations and methodical step-by-step computation. Practical evaluation is applied to the substation R110 kV Dluhonice, where has to be checked up sufficient short-circuit resistance because of short-circuit strength increasing. At the end is analysed the influence of the spring structure constant on short-circuit strength forces in substation. Highly significant utility is the founded program for HV substations designations.
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Koštur, Petr. "Hodnocení investičního záměru." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2020. http://www.nusl.cz/ntk/nusl-414461.
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This master’s thesis deals with a comprehensive evaluation of the company's investment related to the purchase of construction machinery. All calculations are performed according to the theoretical basis introduced in the beginning. To evaluate the effectiveness of the investment, static and dynamic methods are used, together with the sensitivity analysis of individual risk factors. The probability of possible scenarios is determined using a Monte Carlo simulation. To conclude, recommendations whether the project should be implemented is given.
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Mertlík, Jakub. "Valuation and Hedging of Foreign Exchange Barrier Options." Doctoral thesis, Vysoká škola ekonomická v Praze, 2004. http://www.nusl.cz/ntk/nusl-77859.
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The main aim of this thesis is in analyzing and empirically testing the various valuation models and hedging schemes of foreign exchange barrier options and their robustness with respect to changing of market conditions. The purpose of the main empirical section is to get a detailed understanding of the static and dynamic performance of the analyzed models for the barrier options payoff mainly in the extreme market conditions, where we performed a benchmarking of the various hedging schemes. As a by-product, we analyzed the accomplishment of some of the model assumptions in real world setting, and the model dependency of the barrier options.
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Mondek, Jakub. "Časově rozlišená fluorescence systémů polymer-tenzid." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216815.
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In this diploma thesis was studied time-resolved fluorescence in polymer-surfactant system. At first aggregation numbers of cationic (cetyltrimethylammonium bromide), anionic (sodium dodecylsulfate) and nonionic (Triton X-100) surfactants were studied by steady-state and time-resolved fluorescence spectroscopy. These two methods were compared. Aggregation numbers by steady-state method were always lower than aggregation numbers measured by time-resolved method. Steady-state method of determination aggregation numbers is useless for surfactants with high aggregation number and for aerated samples. Addition of hyaluronan to surfactant system was studied. There was observed change in aggregation number after addition of hyaluronan and change in percentage of dynamic quenching after addition of hyaluronan. Hyaluronan affected aggregation number of cetyltrimethylammonium bromide and Triton X-100. Hyaluronan increased percentage of dynamic quenching in cetyltrimethylammonium bromide and in Triton X-100. Pyren in sodium dodecylsulfate was quenched by sphere of action with negligible percentage of dynamic quenching and addition of hyaluronan had no effect on quenching. As next goal of this thesis, the determination of the position of fluorescence probe pyrene in cetyltrimethylammonium bromide, sodium dodecylsulfate and Triton X-100 micelles was chosen. Position of pyrene changed with charge and structure of micelles. Next was studied how percentage of dynamic quenching by iodide compounds changes with different charge of micelle. In all cases majority of dynamic quenching was calculated.
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Gottwald, Adam. "Hodnocení investičního záměru." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2020. http://www.nusl.cz/ntk/nusl-416779.
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The subject of the diploma thesis is the evaluation of a selected investment project of the company. The first part defines the theoretical basis, which describes the investments, financial analysis, investment evaluation methods, and risks, which form the basis for the processing of the analytical part. The second part deals with the basic financial analysis of the company in order to evaluate the financial condition of the company. Furthermore, the investment project itself is evaluated, where also risks are determined, from the perspective of cash flows and the implementation of the project. Finally, based on the performed analyses, the investment opportunity and its weaknesses are comprehensively evaluated, through which is recommended the implementation or rejection of the investment plan.
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Wondimu, Nahom Abebe. "SIMULATED AND EXPERIMENTAL SLIDING MODE CONTROL OF A HYDRAULIC POSITIONING SYSTEM." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145419922.
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Majdič, Petr. "Deformačně napěťová analýza synchronního generátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-230608.
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This master thesis deals with an impact of particular static and dynamic forces and temperature strain on horizontal synchronous generator. In connection with this, a stress distribution in construction and an assessment of security to terminal state of flexibility and weariness is being solved together with finding the most critical places on horizontal synchronous generator.
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Lysoň, Jakub. "Bezdrátový modul akcelerometru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220876.
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This master’s thesis describes a wireless accelerometer module. The aim of this work was to study the properties and involvement of the accelerometer, wireless module design for data transfering from the accelerometer to the PC and the module implementation. As a wireless device is used bluetooth module that enables communication between the product and the computer. The wireless module used rechargable lithium ion battery that helps keep module alive without adapter or net cable.
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BAMDAD-SOOFI, JAHANSHAH. "Performances mecaniques du rotor d'une eolienne darrieus et application a "aeolia 3" en fonctionnement." Paris, ENSAM, 1986. http://www.theses.fr/1986ENAM0006.
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Etude des contraintes et des deformees du rotor pour toute situation de fonctionnement optimal, suivant trois etapes de recherche: 1. Analyse de fabrication des pales d'aeolia 3 (forme troposkienne de construction, parametres geometriques, contraintes normales dues au procede de cintrage). 2. Analyse du comportement statique du rotor. 3. Analyse du comportement dynamique des pales en fonctionnement (y compris l'arret) avec determination des modes propres du rotor et des deformees modales. Deux methodes de calcul, toutes deux matricielles, ont ete etudiees selon les besoins en rapidite du calcul et de sa mise au point et selon les besoins de precision des resultats
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Pavloň, Martin. "Analýza dynamických parametrů laserových vibrometrů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316221.
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This diploma thesis deals with the theoretical description of interference methods used to measure vibrations, examines main parasitic effects and analyses its contribution to achievable the resolution. In the practical part, it uses several measurements to verify the effects of the level of reflected beam, stand-off distance and speckle noise. It also proposes a practical experiment for measuring dynamic parameters and signal-noise ratio. Results show that, the noise is exponentially dependent on the level of the reflected beam. The visible maximum of the vibrometer proved to be critical in terms of time stability of the measured signal level in two of the three measurements. Results of the dynamic measurement show that, the measured deviations were not degraded or significantly disturbed by the noise signal. From the measurement of the speckle noise, it emerged that the lowest level of noise is achieved with smooth and highly reflective materials.
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Ayad, Mohammad. "Homogenization-based, higher-gradient dynamical response of micro-structured media." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0062.
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Une approche dynamique discrète (DDM) est proposée dans le contexte de la mécanique des poutres pour calculer les caractéristiques de dispersion des structures périodiques. Cette démarche permet de calculer les caractéristiques de dispersion de milieux périodiques unidimensionnels et bidimensionnels. Il est montré qu’un développement d'ordre supérieur suffisamment élevé des forces et des moments d’éléments structuraux est nécessaire pour décrire avec précision les modes de propagation d’ordre supérieur. Ces résultats montrent dans l’ensemble que les calculs des caractéristiques de dispersion de systèmes structurels périodiques peuvent être abordés avec une bonne précision par la dynamique des éléments discrets. Les comportements non classiques peuvent être capturés non seulement par une expansion d'ordre supérieur mais aussi par des formulations à gradient supérieur. Nous calculons ainsi les paramètres constitutifs macroscopiques jusqu'au deuxième gradient du déplacement en utilisant deux formulations différentes, soit selon une méthode d'homogénéisation dynamique à gradient supérieur (DHGE) prenant en compte les effets de micro-inertie, ou alternativement selon le principe de Hamilton. Nous analysons ensuite la sensibilité des termes constitutifs du second gradient aux paramètres microstructuraux pour des matériaux composites à microstructure périodique de type laminés. En plus, on montre que les modèles du deuxième gradient formulés à partir de l'énergie interne totale en tenant compte des termes de gradient d'ordre supérieur donnent la meilleure description du propagation d’onde à travers ces milieux. On analyse les contributions d'ordre supérieur et de micro-inertie sur le comportement mécanique de structures composites en utilisant une méthode d'homogénéisation dynamique d'ordre supérieur qui intègre les effets de micro-inertie. Nous calculons la réponse effective statique longitudinale à gradient d’ordre supérieur, en quantifiant la différence relative par rapport à la formulation classique de type Cauchy qui repose sur le premier gradient du déplacement. Nous analysons ensuite les propriétés de propagation d’ondes longitudinales en termes de fréquence propre de composites, en tenant compte de la contribution de la micro-inertie. La longueur interne joue un rôle crucial dans les contributions de micro-inertie avec un effet substantiel pour les faibles valeurs de longueur interne, et qui correspond à une large gamme de matériaux utilisés en ingénierie des structures. La méthode d’homogénéisation développée montre un effet de taille important pour les modules élastiques homogénéisés d’ordre supérieur. Par conséquent, nous développons une formulation indépendante de la taille qui est basée sur des termes de correction liée aux moment quadratique. Dans ce contexte, on analyse l’influence des termes de correction sur le comportement statique et dynamique de composites à inclusion<br>A discrete dynamic approach (DDM) is developed in the context of beam mechanics to calculate the dispersion characteristics of periodic structures. Subsequently, based on this dynamical beam formulation, we calculate the dispersion characteristics of one-dimensional and two-dimensional periodic media. A sufficiently high order development of the forces and moments of the structural elements is necessary to accurately describe the propagation modes of higher order. These results show that the calculations of the dispersion characteristics of structural systems can be approached with good accuracy by the dynamics of the discrete elements. Besides, non-classical behaviors can be captured not only by higher order expansion but also by higher gradient formulations. To that scope, we develop a higher gradient dynamic homogenization method with micro-inertia effects. Using this formulation, we compute the macroscopic constitutive parameters up to the second gradient, using two distinct approaches, namely Hamilton’s principle and a total internal energy formulation. We analyze the sensitivity of the second gradient constitutive terms on the inner material and geometric parameters for the case of composite materials made of a periodic, layered microstructure. Moreover, we show that the formulations based on the total internal energy taking into account higher order gradient terms give the best description of wave propagation through the composite. We analyze the higher order and micro-inertia contributions on the mechanical behavior of composite structures by calculating the effective static and dynamic properties of composite beams using a higher order dynamic homogenization method. We compute the effective longitudinal static response with higher order gradient, by quantifying the relative difference compared to the classical formulation of Cauchy type, which is based on the first gradient of displacement. We then analyze the propagation properties of longitudinal waves in terms of the natural frequency of composite structural elements, taking into account the contribution of micro-inertia. The internal length plays a crucial role in the contributions of micro-inertia, which is particularly significant for low internal length values, therefore for a wide range of materials used in structural engineering. The developed method shows an important size effect for the higher gradients, and to remove these effects correction terms have been incorporated which are related to the quadratic moment of inertia. We analyze in this context the influence of the correction terms on the static and dynamic behavior of composites with a central inclusion
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Mekyska, Jiří. "Analýza řečových promluv pro IT diagnostiku neurologických onemocnění." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-233643.
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This work deals with a design of hypokinetic dysarthria analysis system. Hypokinetic dysarthria is a speech motor dysfunction that is present in approx. 90 % of patients with Parkinson’s disease. The work is mainly focused on parameterization techniques that can be used to diagnose or monitor this disease as well as estimate its progress. Next, features that significantly correlate with subjective tests are found. These features can be used to estimate scores of different scales like Unified Parkinson’s Disease Rating Scale (UPDRS) or Mini–Mental State Examination (MMSE). A protocol of dysarthric speech acquisition is introduced in this work too. In combination with acoustic analysis it can be used to estimate a grade of hypokinetic dysarthria in fields of faciokinesis, phonorespiration and phonetics (correlation with 3F test). Regarding the parameterization, features based on modulation spectrum, inferior colliculus coefficients, bicepstrum, approximate and sample entropy, empirical mode decomposition and singular points are originally introduced in this work. All the designed techniques are integrated into the system concept in way that it can be implemented in a hospital and used for a research on Parkinson’s disease or its evaluation.
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Duboeuf, Olivier. "Contribution à l'optimisation du confort dynamique de sièges automobiles par la compréhension des mousses de polyuréthane." Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH9758.
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L'amélioration du confort dans le secteur automobile constitue actuellement un enjeu majeur. Au coeur de ces préoccupations se trouve le système d'assise, interface majeure entre l'occupant et l'environnement vibratoire du véhicule. Ce mémoire traite de l'étude du constituant principal du siège automobile : la mousse de polyuréthane.Un large panel d'échantillons de ces mousses dont les paramètres de fabrication ont été sélectionnés par l'établissement de plans d'expérience, a été testé selon divers protocoles expérimentaux afin de déterminer leurs caractéristiques physiques, mécaniques quasi-statiques et dynamiques. Un protocole et un dispositif innovant a été conçu pour caractériser la mousse soumise aux vibrations. Des analyses statistiques et des études en composantes principales ont permis de mettre en évidence les corrélations existantes entre les différentes propriétés citées.Une modélisation rhéologique, adaptée à l'application dans un contexte industriel, a été réalisée. Dans ce but, une étude comparative du comportement de différents types de modèles confrontés à certains échantillons de mousse polyuréthane, a été menée.Afin d'extrapoler les résultats obtenus sur les échantillons de mousse vers le siège complet, des essais complémentaires ont été réalisés avec différentes formulations tant en étude quasi-statique que dynamique.L'étude des paramètres de fabrication, des propriétés physiques et de ses comportements mécaniques ont permis de mettre en lumière les liens existants entre ces différentes caractéristiques. Ainsi, il devient possible de concevoir une matelassure aux propriétés prédites en amont et de minimiser le temps de conception d'un siège<br>The improvement of comfort in the automotive industry is a major challenge for car manufacturers and suppliers. At the heart of these concerns is the base seat system, major interface between the occupant and the vehicle vibration environment. This dissertation deals with the study of the main car seat sub-component: polyurethane foam.A wide range of polyurethane foam samples have been molded for a design of experiments according to selected process parameters. Several experimental protocols were employed to determine their physical properties, mechanical quasi-static and dynamic characteristics. A new protocol and an innovative device have been designed to characterize the foam sample submitted to vibrations. Statistical and principal components analysis helped to highlight existing correlations between those properties.A rheological model, adapted to the application in an industrial context, was carried out. For this purpose, a comparative study of the performance of different models applied to various polyurethane foam samples was conducted.To extrapolate the results on foam samples to a complete seat, additional tests have been performed with different formulations in both quasi-static and dynamic studies.The analysis of process parameters, physical properties and quasi-static and dynamic behaviors allowed highlighting of the links between these different features. Thus, it becomes possible to design a foam pad with predicted properties and minimize the time to design a car seat
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Bezrouková, Martina. "Simulace válečkování pomocí explicitní MKP." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230340.
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The purpose of this work is to introduce explicit finite element method (FEM) and to familiarize with commercial software tools witch are capable to perform simulations. The technological conditions and the scope of application of roller burnishing are described in subsequent part. The simulation model of roller burnishing was created. Software ANSYS LS-DYNA was used to make computations. The results of simulation and technical and economical benefits of roller burnishing are presented in the conclusion.
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Lu, Yang. "Analyse de survie bivariée à facteurs latents : théorie et applications à la mortalité et à la dépendance." Thesis, Paris 9, 2015. http://www.theses.fr/2015PA090020/document.
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Cette thèse étudie quelques problèmes d’identification et d’estimation dans les modèles de survie bivariée, avec présence d’hétérogénéité individuelle et des facteurs communs stochastiques.Chapitre I introduit le cadre général.Chapitre II propose un modèle pour la mortalité des deux époux dans un couple. Il permet de distinguer deux types de dépendance : l’effet de deuil et l’effet lié au facteur de risque commun des deux époux. Une analyse de leurs effets respectifs sur les primes d’assurance écrites sur deux têtes est proposée.Chapitre III montre que, sous certaines hypothèses raisonnables, on peut identifier l’évolution jointe du risque d’entrer en dépendance et du risque de mortalité, à partir des données de mortalité par cohortes. Une application à la population française est proposée.Chapitre IV étudie la queue de distribution dans les modèles de survie bivariée. Sous certaines hypothèses, la loi jointe des deux durées résiduelles converge, après une normalisation adéquate. Cela peut être utilisé pour analyser le risque parmi les survivants aux âges élevés. Parallèlement, la distribution d’hétérogénéité parmi les survivants converge vers une distribution semi-paramétrique<br>This thesis comprises three essays on identification and estimation problems in bivariate survival models with individual and common frailties.The first essay proposes a model to capture the mortality dependence of the two spouses in a couple. It allows to disentangle two types of dependencies : the broken heart syndrome and the dependence induced by common risk factors. An analysis of their respective effects on joint insurance premia is also proposed.The second essay shows that, under reasonable model specifications that take into account the longevity effect, we can identify the joint distribution of the long-term care and mortality risks from the observation of cohort mortality data only. A numerical application to the French population data is proposed.The third essay conducts an analysis of the tail of the joint distribution for general bivariate survival models with proportional frailty. We show that under appropriate assumptions, the distribution of the joint residual lifetimes converges to a limit distribution, upon normalization. This can be used to analyze the mortality and long-term care risks at advanced ages. In parallel, the heterogeneity distribution among survivors converges also to a semi-parametric limit distribution. Properties of the limit distributions, their identifiability from the data, as well as their implications are discussed
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Sadykova, Saltanat. "Electric microfield distributions and structure factors in dense plasmas." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16316.
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Die elektrischen Mikrofeldverteilungen (EMDs) und ihre Auswüchse wurden in einkomponentiger (OCP) Elektron-, zweikomponentigen (TCP) Elektron-Positron-, Wasserstoff- und einwertig ionisierten Alkaliplasmen im Rahmen verschiedener Pseudopotentialmodelle (PM) untersucht und mit sowohl Molekulardynamik (MD) und Monte-Carlo Simulationen als auch mit Experimenten vergliechen. Die verwendeten theoretischen Verfahren zur Berechnung von EMDs gehen zurück auf die von C. A. Iglesias entwickelte Kopplungsparameter Integrationstechnik (KPIT) für OCP und die von J. Ortner et al. vorgeschlagene verallgemeinerte KPIT für TCP. EMDs wurden im Rahmen der abgeschirmten Kelbg-, Deutsch-, Hellmann-Gurskii-Krasko(HGK)-PM untersucht, welche quantenmechanische Effekte, Abschirmungseffekte und die Struktur der Ionenrümpfe (HGK) berücksichtigen. Die Abschirmungseffekte wurden auf Grundlage der Bogoljubov-Born-Green-Kirkwood-Yvon- Methode eingeführt. Wir haben das abgeschirmte HGK-Pseudopotential in der Debye-Näherung sowie in einer mäßig gekoppelten Plasma-Näherung verwendet. Wir haben verschiedene Typen vom asymptotischen Verhalten der Verteilungsauswüchse in Abhangigheit von Plasmaparameter, Plasmatypen und Strahler bestimmt. Der Vergleich der experimentell gewonnenen Daten mit sowohl einem synthetischen Li2+-Lyman-Spektrum als auch mit einer synthetischen Li II 548 nm Linie lassen den Schluss zu, daß die EMD, welche auf der Grundlage der Iglesias-Methode für OCP im HGK-PM und der MD erhalten wurde, eine gute Übereinstimmung mit den experimentellen Werten liefert. Die statischen partiellen und Ladung-Ladung-Strukturfaktoren (SSF) wurden für Alkali- und Be2+-Plasmen unter Verwendung der von G. Gregori et al. beschriebenen Methode berechnet. Die dynamischen Strukturfaktoren (DSF) für Alkaliplasmen wurden unter Verwendung der durch V. M. Adamyan et al. entwickelten Methode der Momente berechnet. Bei beiden Methoden wurde das abgeschirmte HGK-Pseudopotential verwendet.<br>The electric microfield distributions (EMDs) and its tails have been studied for electron one-component plasma (OCP), electron-positron, hydrogen and single-ionized alkali two-component plasmas (TCP) in a frame of different pseudopotential models (PM) and compared with Molecular Dynamics (MD) and Monte-Carlo simulations as well as with experiments. The theoretical methods used for calculation of EMDs are a coupling-parameter integration technique (CPIT) developed by C. A. Iglesias for OCP and the generalized CPIT proposed by J. Ortner et al. for TCP. We studied the EMDs in a frame of the screened Kelbg, Deutsch, Hellmann-Gurskii-Krasko (HGK) PMs which take into account quantum-mechanical, screening effects and the ion shell structure (HGK) due to the Pauli exclusion principle. The screening effects were introduced on a base of Bogoljubov-Born-Green-Kirkwood-Yvon method. We used the screened HGK pseudopotential in the Debye approximation as well as in a moderately coupled plasma approximation. The influence of the plasma coupling parameter on the EMD along with the ion shell structure was investigated. We determined different types of asymptotic behaviour of EMD tails in dependence on the plasma type, parameters and radiator. Comparison of a synthetic Li2+ Lyman spectrum as well as comparison of a synthetic Li II 548 nm line with experimental data allows us to conclude that the EMD, obtained on a base of the CPIT method for OCP within the HGK PM and MD, provides a good agreement with the experiment. We have calculated the partial and charge-charge static structure factors (SSF) for alkali and Be2+ plasmas using the method described by G. Gregori et al.. We have calculated the dynamic structure factors (DSF) for alkali plasmas using the method of moments developed by V. M. Adamyan et al. In both methods the screened HGK pseudopotential has been used.
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Hokeš, Filip. "Statická a dynamická analýza předpjaté mostní konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226802.
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The main objective of the thesis is to perform static and dynamic analysis of prestressed concrete bridge structures in computational system ANSYS. For the analysis was chosen footbridge over the river Svratka in Brno. In relation to this topic are solved various types of modeling prestress at a finite element level. Before analyzing the footbridge is analyzed in detail the static system and the corresponding final geometry of the structure. Knowledge of the functioning of the static system is used to build the computational model of the structure, on which is subsequently performed static and dynamic analysis.
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Hakala, Tim. "Settling-Time Improvements in Positioning Machines Subject to Nonlinear Friction Using Adaptive Impulse Control." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1061.
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A new method of adaptive impulse control is developed to precisely and quickly control the position of machine components subject to friction. Friction dominates the forces affecting fine positioning dynamics. Friction can depend on payload, velocity, step size, path, initial position, temperature, and other variables. Control problems such as steady-state error and limit cycles often arise when applying conventional control techniques to the position control problem. Studies in the last few decades have shown that impulsive control can produce repeatable displacements as small as ten nanometers without limit cycles or steady-state error in machines subject to dry sliding friction. These displacements are achieved through the application of short duration, high intensity pulses. The relationship between pulse duration and displacement is seldom a simple function. The most dependable practical methods for control are self-tuning; they learn from online experience by adapting an internal control parameter until precise position control is achieved. To date, the best known adaptive pulse control methods adapt a single control parameter. While effective, the single parameter methods suffer from sub-optimal settling times and poor parameter convergence. To improve performance while maintaining the capacity for ultimate precision, a new control method referred to as Adaptive Impulse Control (AIC) has been developed. To better fit the nonlinear relationship between pulses and displacements, AIC adaptively tunes a set of parameters. Each parameter affects a different range of displacements. Online updates depend on the residual control error following each pulse, an estimate of pulse sensitivity, and a learning gain. After an update is calculated, it is distributed among the parameters that were used to calculate the most recent pulse. As the stored relationship converges to the actual relationship of the machine, pulses become more accurate and fewer pulses are needed to reach each desired destination. When fewer pulses are needed, settling time improves and efficiency increases. AIC is experimentally compared to conventional PID control and other adaptive pulse control methods on a rotary system with a position measurement resolution of 16000 encoder counts per revolution of the load wheel. The friction in the test system is nonlinear and irregular with a position dependent break-away torque that varies by a factor of more than 1.8 to 1. AIC is shown to improve settling times by as much as a factor of two when compared to other adaptive pulse control methods while maintaining precise control tolerances.
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Petrásková, Eva. "Sledování poškození plicní funkce infekčním onemocněním COVID-19 pomocí spirometrie." Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-446332.
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The thesis is focused on the comparison of functional examination of the patients lungs, before and after coronavirus disease 2019 (COVID-19), as well as on the comparison of physiological data for a individual person with measured values after the disease. The relationship between lung function and smoking, sex, age and time gap after COVID undergone was monitored. The screening was accomplished by spirometry in a pneumology surgery and the obtained data were processed in practical part of my thesis. The theoretical part of the diploma thesis describes the respiratory system and lungs functional testing. In addition, infectious disease COVID-19 is described herein. The aim of the thesis was to select suitable patients, who have suffered from the COVID-19 disease, but without other serious respiratory problems, make a measurements and statistically evaluate the correlation between the measured results. The experiment involved 66 people aged between 21-94, of which 43 were men and 23 women. It has been shown a predominantly negative effect of COVID-19 in the values of the examined indicators in spirometric measurements, similarly, the impairment was seen more in men than in women. The role of younger age has been proven in the better results of spirometric measurements. However, the differences in...
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Pavlíková, Miriam. "Statické a dynamické charakteristiky lingvopalatálního kontaktu českého /ř/." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-324117.
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An unique Czech fricative thrill - /ř/ - was studied mainly by Dr. Hála and Dr. Chlumský in the first half of the twentieth century. The methods employed were rather simple and the experiments were done on limited sample size. We decided to revisit and extend the results with electropalatography (EPG). Four female and three men participated in the experiments that were based on reading aloud voiced and voiceless /ř/ in various contexts. We dedicated a short part to dynamic characteristics of /ř/ and focused predominantly on the area of linguopalatal contact. We described the points of linguopalatal contact during /ř/ with adjusted anteriority index (CA). The possible factors affecting the CA are discussed. We scrutinized the differences in CA depending on selected factors for the whole group and each participant. The data suggest that thrill /ř/ occurs in the alveolar area. Anteriority index was chiefly dependent on voicing /ř/, type of the read material and also differed among various speakers.
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Slabá, Andrea. "Využití dynamické a statické diagnostiky u dětí s poruchou attachmentu." Master's thesis, 2020. http://www.nusl.cz/ntk/nusl-436630.
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This diploma thesis aims to compare the results in the field of cognitive functions obtained by static and dynamic assessment of children with attachment disorder at preschool age. The ACFS-cz assessment battery was used for the dynamic assessment, specifically four subtests: Categorisation, Short-term auditory memory (Story Retelling), Short-term visual memory, Sequential Pattern Completion. The method of static assessment was Woodcock- Johnson IV COG, specifically four subtests: Visualization, Verbal Attention, Picture Recognition, Analysis-Synthesis. The research sample consisted of 16 preschool children (3 to 6 respectively 8 years) placed in institutional care. The results showed that there were no differences between the of the ACFS-cz pretest scores and the Woodcock-Johnson IV COG scores. While the comparison of the results of the ACFS-cz posttest with Woodcock- Johnson IV COG showed significant differences in the three examined areas (Categorisation, Short-term auditory memory, Short-term visual memory). The outcomes of the dynamic assessment lead to suitable interventions for the cognitive development of children in institutional care. Keywords ACFS, Woodcock-Johnson IV COG, cognitive functions, attachment disorder, preschool age.