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Dissertations / Theses on the topic 'Load spectra'

Author: Grafiati

Published: 17 February 2024

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1

Khosrovaneh, Abolhassan K. "Fatigue analysis and reconstruction of helicopter load spectra." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54213.

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Helicopter load histories applied to notched metal samples are taken as examples, and their fatigue lives are predicted by using a simplified version of the local strain approach. This simplified method requires an input load history in the form of the rain-flow matrix and places bounds on the fatigue life. A peak-valley reconstructed history is generated based on the standard spectrum Helix. A second history studied is a more irregular one based on actual flight data. lt is used to generate three reconstructed histories based on three principles: peak-valley, to-from, and rain-flow. Emphasis

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2

Zitounis, Vasilios. "Fatigue crack growth rates under variable amplitude load spectra containing tensile underloads." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/105.

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An extensive research program was performed to investigate the load interaction effect of the combined action of small amplitude high R ratio cycles and large amplitude low R ratio underloads on the crack growth of large cracks. The study was driven by the needs of the damage tolerance approach in the helicopter structures, which requires robust knowledge on the crack growth behaviour of the advance high strength alloys under the characteristic helicopter spectra loading. The study was conducted on three metallic alloys, Ti-10V-2Fe-3Al, Al8090 T852 and Al7010 T76351 using compact tension speci

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3

Lee, Hongchul. "Advanced aircraft service life monitoring method via flight-by-flight load spectra." Diss., Online access via UMI:, 2009.

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Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Mechanical Engineering, 2009.<br>Includes bibliographical references.

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4

Walter, Richard W. "Study of statistical variations of load spectra and material properties on aircraft fatigue life." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24056.

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5

Shan, Martin [Verfasser]. "Load Reducing Control for Wind Turbines: Load Estimation and Higher Level Controller Tuning based on Disturbance Spectra and Linear Models / Martin Shan." Kassel : Universitätsbibliothek Kassel, 2017. http://d-nb.info/1154972496/34.

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6

Entesar, Abdullah Ali. "Statistical analysis of truck loading on Swedish highways." Thesis, KTH, Transportvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-45980.

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Vehicle over loading, or single axle over loading, is one of the major causes of pavement deterioration. Trafik Verket (TV), the Swedish Transport Administration, recognized that the current process for estimating traffic volume should be reevaluated, and if possible improved. This degree project uses data from the Bridge Weigh in Motion (BWIM) system to study the actual loads applied to Swedish highways. The axle load spectrum is plotted with the conventional frequency distribution plots, and with a new cumulative distribution approach. The paper introduces the maximum allowable potential veh

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7

Fontenele, Heliana Barbosa. "Representação do tráfego de veículos rodoviários de carga através de espectros de carga por eixo e seu efeito no desempenho dos pavimentos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-12032012-111950/.

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A caracterização das cargas do tráfego é de grande importância para o dimensionamento de pavimentos, bem como para a quantificação do desempenho para fins de gerência de pavimentos. A utilização de abordagens empíricas para determinar os efeitos das cargas do tráfego nas estruturas de pavimentos, datadas dos anos 1960, apresentam sérias limitações, pois seus resultados são válidos somente para os mesmos, ou muito similares, fatores intervenientes que prevaleciam quando do seu desenvolvimento. Os fatores relativos às solicitações do tráfego e às características dos veículos (tipo de eixo, tipo

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Frankhouser, Andrew. "Characterization of Ohio Traffic Data for Integration into the Mechanistic-Empirical Pavement Design." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1365980149.

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9

Elsässer, Robert. "Spectral methods for efficient load balancing strategies." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965647145.

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10

Reytier, Thomas. "Modelling fatigue spectra of aircraft structure under gust loads." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1614/.

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Cette thèse est consacrée à l'analyse de fatigue et de tolérance aux dommages des structures d'avions soumis aux rafales de vent. L'analyse de fatigue et de tolérance aux dommages est un enjeu essentiel dans la conception des structures d'avions. Elle permet de définir un programme d'inspection de la structure afin d'assurer sa sécurité tout au long de la vie de l'avion. La première partie passe en revue l'état de l'art dans les différents domaines impliqués dans le processus global d'analyse de fatigue des structures d'avions soumis aux rafales de vent: la modélisation de la turbulence atmosp

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11

Zhong, Shiyin. "Electricity Load Modeling in Frequency Domain." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/75109.

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In today's highly competitive and deregulated electricity market, companies in the generation, transmission and distribution sectors can all benefit from collecting, analyzing and deep-understanding their customers' load profiles. This strategic information is vital in load forecasting, demand-side management planning and long-term resource and capital planning. With the proliferation of Advanced Metering Infrastructure (AMI) in recent years, the amount of load profile data collected by utilities has grown exponentially. Such high-resolution datasets are difficult to model and analyze due to

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12

Remington, A. M. "Selective attention and perceptual load in autism spectrum disorder." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19503/.

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This thesis examines selective attention in young adults with Autism Spectrum Disorder (ASD). Existing literature regarding this issue is mixed; some research suggesting an overly-focused attentional style (Rincover & Ducharme, 1987) while others highlight an abnormally broad attentional lens (Burack, 1994). The research presented here has, for the first time, examined selective attention in individuals with ASD using a theoretically-led approach based on Lavie’s Load Theory of attention and cognitive control (Lavie et al., 2004). Load theory states that the perceptual load (amount of potentia

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13

ONO, YUICHIRO, SHIN'YA YAMADA, MASASHI FURUTA, et al. "The Scale Method as a Spectral Analysis for Accommodative Fluctuation." Nagoya University School of Medicine, 1987. http://hdl.handle.net/2237/17496.

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14

Donati, Dario. "Analysis of aircraft load spectrum by means of flight simulator." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9346/.

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Damage tolerance analysis is a quite new methodology based on prescribed inspections. The load spectra used to derive results of these analysis strongly influence the final defined inspections programs that for this reason must be as much as possible representative of load acting on the considered structural component and at the same time, obtained reducing both cost and time. The principal purpose of our work is in improving the actual condition developing a complete numerical Damage Tolerance analysis, able to prescribe inspection programs on typical aircraft critical components, respecting

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15

Babish, John. "A modal/spectral analysis of mass distribution effects in a fluid-load plate." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/19472.

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Li, Ran. "Load profiling on time and spectral domain : from big data to smart data." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665434.

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With the promotion of demand side responses (DSRs) and low carbon technologies (LCTs), there is a growing interest in visualising the demand information at individual consumer and low voltage (LV) network level, where demands are less aggregated and highly volatile. Yet, traditional load profiling techniques, which are carried out on small data, are struggling to meet the requirements on accuracy and granularity. This thesis contributes to this area by extending traditional load profiling to a big-data context, where refined load profiles (smart data) can be extracted by two novel load profili

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Yoo, Byungseok. "Practical Aspects of Assessing Nonlinear Ultrasonic Response of Cyclically Load 7075-T6 Aluminum." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/36335.

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The ultrasonic NDE technique to characterize the ultrasonic nonlinear response of the cyclically load 7075-T6 aluminum is described in this thesis. In order to estimate the nonlinear relation of the ultrasonic waves due to material fatigue damage or degradation, the spectral analysis techniques such as the power spectrum, bispectrum, and bicoherence spectrum are applied. The ultrasonic nonlinearity parameters by Cantrell and Jhang are introduced and presented as a function of the material fatigue growth, the number of fatigue cycles. This thesis presents the effectiveness of the bispectral ana

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Tillmann, J. E. "Cross-modal selective attention and perceptual load in autism spectrum disorder." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1474696/.

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This thesis investigated cross-modal selective attention in children and adolescents with Autism Spectrum Disorder (ASD) and typically developing (TD) individuals using the Load Theory of Selective Attention and Cognitive Control (Lavie, 1995). Perceptual load theory states that perception of irrelevant stimuli depends on the perceptual load of the task (the amount of task relevant information). At low levels of perceptual load, when finite perceptual capacity is not reached, remaining resources ‘spill over’ and irrelevant stimuli are automatically processed; when perceptual load exhausts capa

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Gros-Borot, Maeva. "Modelling a foil load spectrum using recorded data on a racing foiling yacht." Thesis, KTH, Marina system, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226532.

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The intent of this Master Thesis is to investigate foil loadings on racing foiling yacht based on recorded data. This work was done by means of recorded microstrains along the foil and other recorded data such as boat speed and fly height. Composite foils are developed by the company GSea Design using an in-house software called Sofia which uses Fluid Structure Interaction (FSI) to design deformable appendages. In this Master Thesis, a tool that enables to get a numerical model of the foil adjusted to the recorded strains at a given time was designed. For that, recorded strains along the foil

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Parveen, Tania. "Composite load model decomposition : induction motor contribution." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/31301/1/Tania_Parveen_Thesis.pdf.

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In this thesis, a new technique has been developed for determining the composition of a collection of loads including induction motors. The application would be to provide a representation of the dynamic electrical load of Brisbane so that the ability of the power system to survive a given fault can be predicted. Most of the work on load modelling to date has been on post disturbance analysis, not on continuous on-line models for loads. The post disturbance methods are unsuitable for load modelling where the aim is to determine the control action or a safety margin for a specific disturbance.

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Bellec, Enora. "Spectres de chargement pour le dimensionnement à la fatigue d’un véhicule automobile : identification, analyse et modélisation." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2023. http://www.theses.fr/2023ENTA0003.

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Les constructeurs automobiles se doivent d’assurer la fiabilité de l’ensemble des pièces de la liaison au sol sur toute la durée de vie du véhicule. Cependant, aucun cadre normatif global n’existe pour le dimensionnement de ces pièces. Ils doivent donc se baser sur leur expérience. Il est nécessaire pour tout protocole de dimensionnement de maîtriser précisément les chargements vus par les pièces. La sollicitation perçue par la liaison au sol est d’autant plus complexe à considérer qu’elle est à amplitude variable (suivant les situations de vie rencontrées) et multi-entrées (chargements perçus

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22

Sanz, de la Garza María. "Characterization of the spectrum of cardiac adaptation to endurance exercise: Impact of gender and training load." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/585889.

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The beneficial impact of regular physical activity on cardiovascular health is well established. However, the ideal amount of exercise required to provide these benefits is not well defined, with some recent reports showing no further cardiovascular benefits and even detrimental effects when performing exercise with high training loads, particularly for endurance sports disciplines. Indeed, during the last two decades, an increasing amount of data has related high endurance training loads with an increased susceptibility for atrial arrhythmias as well as with a detrimental right ventricle remo

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23

Mason, Patrick H. "Identification of random loads impinging on the RAH-66 Comanche Helicopter empennage using spectral analysis." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA349809.

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Thesis (M.S. in Aeronautical Engineering) Naval Postgraduate School, June 1998.<br>Thesis advisor(s): E. Roberts Wood, Donald A. Danielson, Joshua H. Gordis. "June 1998." Includes bibliographical references (p. 143-144). Also available online.

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24

Berton, Marco. "Parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424397.

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The aim of this thesis is to unveil the nature of the so-called parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies (F-NLS1s). These sources are a subclass of active galactic nuclei which was recently identified as the third class of $\gamma$-ray emitting AGN. They likely harbor a relativistic jet directed toward the observer. The aim was to understand how do they appear when observed under a different inclination. To study their parent population I built four samples of parent candidates, that is steep-spectrum narrow-line Seyfert 1 galaxies (S-NLS1s), radio-quiet nar

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Alp, Dennis. "X-ray spectral analysis of the radio-loud narrow-line Seyfert 1 galaxy RX J1633+4718." Thesis, KTH, Fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189051.

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26

Mekonnen, Muluneh Admass. "Modeling flow and sediment transport in water bodies and watersheds." Doctoral thesis, KTH, Vattendragsteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4703.

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The research focus is on the various modeling aspects of flow and sediment transport in water bodies and watersheds. The interaction of flow with a mobile bed involves a complex process in which various turbulent scales characterized by coherent structures cause a chaotic sediment motion. In many rivers and natural waterways secondary flows that are dominating flow struc-tures bring about more complications. In estuaries and open waterbodies thermal stratification and internal mixing control the flow structure besides the flow interaction with the mobile bed. To adequately model these processe

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Zhang, Han. "Global Analysis and Structural Performance of the Tubed Mega Frame." Thesis, KTH, Betongbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147382.

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The Tubed Mega Frame is a new structure concept for high-rise buildings which is developed by Tyréns. In order to study the structural performance as well as the efficiency of this new concept, a global analysis of the Tubed Mega Frame structure is performed using finite element analysis software ETABS. Besides, the lateral loads that should be applied on the structure according to different codes are also studied. From the design code study for wind loads and seismic design response spectrums, it can be seen that the calculation philosophies are different from code to code. The wind loads are

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Harwood, Jeremy James. "The dynamics and energetics of radio-loud active galaxies." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/14409.

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In this thesis, I use the new generation of radio interferometer along with X-ray observations to investigate the dynamics and energetics of radio-loud active galaxies which are key to understanding AGN feedback and the evolution of galaxies as a whole. I present new JVLA observations of powerful radio source and use innovative techniques to undertake a detailed analysis of JVLA observations of powerful radio galaxies. I compare two of the most widely used models of spectral ageing, the Kardashev-Pacholczyk and Jaffe-Perola models and also results of the more complex, but potentially more real

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Palma, Cruz Norman I. "Multiwavelength Analysis of the Gamma-Ray Blazar PKS 0528+134 in Quiescence." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289321486.

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Wu, Long. "Separating Load Torque Oscillation and Rotor Faults in Stator Current Based-Induction Motor Condition Monitoring." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14545.

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Stator current spectral analysis techniques are usually used to detect rotor faults in induction machines. Magnetic field anomalies in the airgap due to the rotor faults result in characteristic side-band harmonic components in the stator current spectrum, which can be measured as rotor fault signatures. A position-varying load torque oscillation at multiples of the rotational speed, however, has exactly the same effect. Stator current harmonics due to a load torque oscillation often obscure and even overwhelm rotor eccentricity fault detection since the magnitude of load oscillation induce

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31

Aswegan, Kevin Paul. "Rational Procedure for Damage Based Serviceability Design of Steel Buildings Under Wind Loads and a Simple Linear Response History Procedure for Building Codes." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51549.

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This thesis is divided into two topics: the development of a procedure for wind serviceability design of steel buildings and the development of a simple linear response history analysis for building codes. In the United States the building codes are generally silent on the issue of serviceability. This has led to a wide variation in design practices related to service level wind loads. Chapter 2 of this thesis contains a literature review which discusses pertinent aspects of wind drift serviceability, including selecting the mean recurrence interval (MRI), mathematical modeling of the structu

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Kaabia, Bassem. "Méthodes avancées d'évaluation des charges de vent sur les structures de concentrateurs solaires." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11315.

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L’énergie solaire photovoltaïque concentré (CPV) est une solution de remplacement prometteuse aux structures solaires conventionnelles. Ce type de structure modulable doit être optimisé afin d’être compétitif par rapport aux autres types de production d’énergie. Les forces de vent demeurent la première préoccupation dans la conception de la structure porteuse en acier d’un tel système. L’objectif principal de cette recherche est d’assembler des outils numériques et analytiques afin de prédire les caractéristiques de sa réponse dynamique sous charges de vent turbulent. La maîtrise de cette étap

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Roche, Laëtitia. "Percevoir l'interaction sociale dans le mouvement humain : études psychophysiologiques du développement typique et dans les troubles du spectre autistique." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR3323/document.

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L'interaction sociale représente l’une des difficultés majeures des patients atteints de troubles envahissants du développement (TED). Or, la perception des mouvements humains contribue à la mise en place des comportements sociaux et représenterait un « marqueur » du développement de la cognition sociale. Cette étude de suivi du regard et de pupillométrie visait à caractériser l’attention visuo-spatiale et la charge cognitive au cours de la perception de mouvements biologiques humains porteurs d'intention sociale (MHS) chez 139 participants typiques (PaTYP) et 62 patients atteints d’un TED (Pa

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Ge, Zhongfu. "Analysis of surface pressure and velocity fluctuations in the flow over surface-mounted prisms." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/25965.

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The full-scale value of the Reynolds number associated with wind loads on structures is of the order of 10^7. This is further complicated by the high levels of turbulence fluctuations associated with strong winds. On the other hand, numerical and wind tunnel simulations are usually carried out at smaller values of Re. Consequently, the validation of these simulations should only be based on physical phenomena derived with tools capable of their identification. In this work, two physical aspects related to extreme wind loads on low-rise structures are examined. The first includes the statistica

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35

Desaunay, Pierre. "Etudes comportementale et électrophysiologique de la mémoire dans les troubles du spectre de l'autisme Memory in autism spectrum disorders : a meta-analysis of experimental studies Prospective memory in adolescents with autism : a preliminary study of the impact memory load Impact of semantic relatedness on associative memory : an ERP study Exploring the ERP time-cours of associative recognition in autism Autisme et connectivité cérébrale : contribution des études de neuroimagerie à la compréhension des signes cliniques." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC051.

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La mémoire est une fonction cognitive majeure, support de nos souvenirs personnels, et permettant les apprentissages et les résultats académiques. Son étude dans les troubles du spectre de l’autisme (TSA) est principalement comportementales et peu imagerique, avec une hétérogénéité de résultats et certain domaines peu explorés. Dans cette perspective, nous présentons dans cette thèse les résultats d’une méta-analyse de la mémoire dans les TSA, des résultats comportementaux en mémoire prospective event-based, et des données préliminaires en électroencéphalographie (EEG). Les résultats de la mét

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Goodin, Jacob, Caleb D. Bazyler, J. R. Bernards, Satoshi Mizuguchi, J. Walters, and Michael H. Stone. "Comparison of Power and Velocity in the High Bar and Low Bar Back Squat across a Spectrum of Loads." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/3833.

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PURPOSE: To examine differences in mean power output between high bar (HBS) and low bar back squats (LBS). METHODS: Six trained males (25.0 ± 3.1 years, 1.78 ± 0.04 m, 87.6 ± 7.5 kg) with previous squatting experience (experience: 7.5 ± 4.1 years, HBS 1RM: 157.0 ± 15.3 kg, squat/bodyweight: 1.8 ± 0.18) completed the study using a crossover design. Subjects completed a 4-week familiarization phase with both conditions. Mean power data was collected over 2 sessions using dual uniplanar force plates and 4 linear position transducers sampling at 1,000 Hz. Subjects were randomly assigned to the HBS

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Goodin, Jacob R., Caleb D. Bazyler, Jake R. Bernards, Joseph Walters, Satoshi Miziguchi, and Michael H. Stone. "Comparison of Power and Velocity in the High Bar and Low Bar Back Squat across a Spectrum of Loads." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/3820.

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Wagstaff, Robert H. "The spectre of Lord Atkin in the aftermath of 9/11 : the rule of law and terror detentions in the United States & the United Kingdom." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543601.

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Janošková, Lenka. "Dynamická analýza konstrukce zatížené seismickým zatížením." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226464.

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In this diploma thesis the seismic load on two different models is solved – the first model is a beam hall and the second model is a multistory building. The calculation of seismic load was performed according to standard ČSN EN 1998-1 (Eurocode 8) using the response spectrum analysis and the method of equivalent static forces (substi-tute load). For the combination of seismic responses in different directions are used SRSS and CQC rules. Models and calculations were solved in a student’s version of program RFEM 4.10 (Ing. Software Dlubal, s.r.o.). The comparison of mentioned methods in each m

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Trajin, Baptiste. "Analyse et traitement de grandeurs électriques pour la détection et le diagnostic de défauts mécaniques dans les entraînements asynchrones. Application à la surveillance des roulements à billes." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00554240.

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Les entraînements électriques à base de machine asynchrone sont largement utilisés dans les applications industrielles en raison de leur faible coût, de leurs performances et de leur robustesse. Cependant, des modes de fonctionnement dégradés peuvent apparaître durant la vie de la machine. L'une des raisons principales de ces défaillances reste les défauts de roulements à billes. Afin d'améliorer la sûreté de fonctionnement des entraînements, des schémas de surveillance peuvent être mis en place afin d'assurer une maintenance préventive. Ce travail de thèse traite de la détection et du diagnos

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VELOSO, MARCELO N. "Avaliação in vitro dos efeitos da radiação ionizante em tecido ósseo bovino por espectroscopia ATR-FTIR e análise dinâmico-mecânica." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10573.

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Made available in DSpace on 2014-10-09T12:42:07Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:44Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Atila, Zelić. "Uticaj sila zakošenja na zamor noseće konstrukcije mosne dizalice pri njenom kretanju." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107221&source=NDLTD&language=en.

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Disertacija obrađuje problematiku praktičnog uvođenja opterećenja izazvanihzako&scaron;avanjem dizalice u normiranu proceduru dokaza zamorne čvrstoće njene nosećekonstrukcije. U prvom delu rada koncizno je izložena teorijska podloga zako&scaron;avanjamosne dizalice, neophodna za potpunije razumevanje relevantnih obeležja predmetaistraživanja. Predložene su metode za eksperimentalnu determinaciju bočnih sila uinterakciji točak – &scaron;ina, odn. vodeća rolna – &scaron;ina. Testiranje predloženih metodaspovedeno je kroz eksperimente na realnom objektu – jednogredoj električnoj

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Šulerová, Zdeňka. "Dynamická analýza konstrukce zatížená seismickým zatížením." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226647.

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This thesis deals with the calculation of response of reinforced concrete construction on the effect of seismic tension. Time and spectral analysis were made. They are mentioned as possible ways of calculation in EN 1998 - 1:2004 norm. Final figures of global deformations and stress on selected beam from the time and spectral analysis were firstly compared for the horizontal components of seismic stress affecting only in one direction. Subsequently comparison of time progress to combination of these effects mentioned in relevant norm was made. In the conclusion the results of used analysis are

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Piquet, Arthur. "Analyse physique et simulation numérique des phénomènes de décollement de jet dans les tuyères supersoniques." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR09/document.

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Cette thèse, initiée par un programme de coopération franco-britannique entre la DGA et la DSTL, est consacrée à l’étude des phénomènes de décollement de jet au sein des tuyères propulsives sur-détendu. L’aérothermodynamique des systèmes propulsifs (missile, avion supersonique ou lanceur) est un des domaines de la mécanique des fluides où des progrès décisifs restent à réaliser pour améliorer les performances des ensembles moteurs, en terme de bilan de poussée, de stabilité, de fiabilité et de réduction de nuisances (bruit, émission de polluants, etc.). Les conditions de vols et la complexité

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Alfonso, Medina Hugo Leonardo. "Caractérisation et modélisation des assemblages multi-matériaux sous sollicitations mixtes quasi-statiques pour la conception des structures automobiles." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0118/document.

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Durant ces dernières années, les émissions de CO2 liées à l’utilisation des voitures ont atteint des niveaux critiques contribuant au réchauffement climatique et causant des problèmes de santé. Afin de réduire ces émissions, l’industrie automobile française a décidé de réduire la masse des véhicules via l’utilisation de matériaux plus légers tels que les matériaux composites. Cependant, les techniques d'assemblage classiquement utilisées ne sont pas compatibles pour assembler ces nouveaux matériaux à la structure du véhicule (acier et aluminium). Le principal objectif de cette étude a donc été

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Nedbal, David. "Návrh manuální pravoúhlé frézovací hlavy určené pro technologické operace na středně těžkých obrobcích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382413.

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This thesis deals with mechanical design of right-angle manual milling head for headstock of horizontal boring machine of Fermat production. The thesis includes research of milling head types, Fermat production heads, but also heads of competition companies with similar parameters like designed head. Design part of thesis is about describing used components of chosen solution. The thesis includes also technical report describing calculation of load spectrum from machining, design of gears, calculation of reactions in spindle bearings, spindle deformation and control of spindle bearings. The en

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Tabatabaei, Araghi Pedram. "Seismic analysis of concrete structures within nuclear industry." Thesis, KTH, Betongbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147215.

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Earthquake has always been a hazard for civil structures and keeping the structures integrity during and after an earthquake is of vital importance. This phenomenon’s impact is sudden and there is little or no warning to make the preparations for this natural disaster. Much damage has been done on structures which have led to major collapses and loss of many lives. Civil structures such as nuclear power plants are designed to withstand earthquakes and in the event of a major seismic event, to shut down safely. The aim of this thesis is to present the seismic design procedures for concrete stru

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Ruchert, Cassius Olivio Figueiredo Terra. "Correlação de estrias de fadiga com espectro de cargas em liga de Al aeronáutica SAE-AMS 7475 T 7351." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-10092008-095023/.

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Este trabalho discutiu a relação entre o espaçamento inter-estrias , isto é, a taxa de propagação da trinca microscópica SL (local) e SP (projetada) e a taxa de propagação macroscópica , da/dN, obtido após o ensaio de propagação de trinca por fadiga. Corpos de prova compacto C(T) foram extraídos na orientação LT do centro de uma placa laminada de liga de alumínio SAE-AMS 7475 T7351 onde posteriormente foram realizados ensaios de fadiga sob carga ou &#916K constantes, à temperatura ambiente de acordo com a Norma ASTM-E647 (1993). Para o ensaio sob carga constante foram obtidos os dados do estág

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Zebiri, Boubakr. "Étude numérique des interactions onde de choc / couche limite dans les tuyères propulsives Shock-induced flow separation in an overexpanded supersonic planar nozzle A parallel high-order compressible flows solver with domain decomposition method in the generalized curvilinear coordinates system Analysis of shock-wave unsteadiness in conical supersonic nozzles." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR06.

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La nécessité d’une meilleure compréhension du mécanisme d’entrainement pour l’instabilité à basse fréquence observée dans un écoulement dans une tuyère sur-détendue a été discutée. Le caractère instable de l’onde de choc/couche limite reste un défi pratique important pour les problèmes des écoulements dans les tuyères. De plus, pour une couche limite turbulente incidente donnée, ce type d’écoulement présente généralement des mouvements de choc à basse fréquence plus élevées qui sont moins couplés aux échelles de temps de la turbulence en amont. Cela peut être bon du point de vue d’un expérimen

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Skalka, Miroslav. "Analýza vlivu mechanického momentu asynchronního stroje na sycení magnetického obvodu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233534.

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e main goal of this thesis is mechanical torque analysis of induction machine based on magnetic circuit saturation, oversaturated areas classification and the possibility of oversaturated areas reduction of their influence on machine properties. Whole problem is solved by finite element method in ANSYS program. Work is divided into the description and creating of electromagnetic model, a method of the induction machine equivalent circuit parameters determination, the electromagnetic field calculation by finite element method, experimental measurement using LabVIEW program with measurement acce

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