Дисертації з теми "Load stability"
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Dai, F. "Load modelling for power system stability studies." Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578290.
Повний текст джерелаMonnin, Jared P. "Impact of load type on microgrid stability." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76821.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
CD-ROM contains PDF of thesis and MDL file.
Both MIT Institute Archives and Barker Library copy: with CD-ROM.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references.
Microgrids show great promise as a means of integrating distributed generation sources into the public grid distribution system. In order to provide uninterrupted,high quality power to local loads, microgrids must have the ability to operate independently of or in parallel with the local utility. Transitioning between independent operation, also called "islanded" operation, and utility connected operation can induce stability problems in the microgrid, especially when islanding is fault induced. Software simulation suggests that induction motor loads on the microgrid significantly decrease stability during fault induced islanding. To validate the software simulations and to investigate the impact of load type on microgrid stability, we have built a hardware system that simulates the operation of a microgrid.
by Jared P. Monnin.
M.Eng.
Vargas, Rios Leon Maximino. "Local voltage stability assessment for variable load characteristics." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/21424.
Повний текст джерелаMORAES, ADELIO JOSE DE. "CONTRIBUITIONS TO THE LOAD MODELLING FOR TRANSIENT STABILITY STUDIES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8361@1.
Повний текст джерелаEste trabalho, relacionado com a área de modelagem de cargas para estudos de estabilidade transitória de sistemas elétricos, tem por objetivo discutir a adequação dos modelos clássicos normalmente utilizados, bem como o aprimoramento e desenvolvimento de representações para cargas com características específicas. Inicialmente, são enfocados os aspectos das representações clássicas de cargas e, através de desenvolvimentos teóricos e estudos computacionais, ressaltadas as adequações destas estratégias ao contexto atual. Reconhecendo algumas limitações quanto às técnicas para a obtenção dos parâmetros de motores de indução, apresenta- se procedimentos sistematizados para o tratamento destes componentes de carga. Tendo em vista a busca da melhoria de modelos e respostas aos questionamentos a respeito da relevância da inclusão dos efeitos da variação da freqüência sobre as cargas e parâmetros da rede, o trabalho prossegue com investigações nesta direção. Objetivando a análise do desempenho dos modelos simplificados de cargas através de funções algébricas, são discutidas as propostas atuais e verificadas suas adequações aos estudos de estabilidade. Finalmente, considerando a importância atual das cargas conversoras estáticas, são desenvolvidos modelos apropriados e realizados os estudos necessários à incorporação de unidades retificadoras em programas de estabilidade.
This work, involved with the load modeling for electrical system transiente stability analysis, aim to discuss the classical load models normally used, and to develop and improve representations of specific types of loads. Initially, aspects concerned with classical load representations are dealt with aiming to evaluate, through theoretical and computational analyses, the current employment of such models. Knowing that the techiques to obtain induction motor parameters are still deficient, this work presents some systematic procedures for the treatment of such loads. Additionally, it continues seeking improvements in electrical system component models and answers to the questions about the need for inclusion of the frequency variation effects on loads and network parameters. Moreover, it takes into account the tendencies of using simplified load models represented by algebraic expressions. Some recent proposals in this area are discussed and tested with a view to acess the perfomance of the models in stability studies. Finally, considering the present importance of static load converters, it is developed the related models and presented the necessary studies to include rectifier units in stability programs.
MOROTE, CARLOS HUGO SOTO. "STABILITY AND DEFORMATION OF SOIL SLOPES UNDER SEISMIC LOAD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9532@1.
Повний текст джерелаO comportamento sísmico de taludes tem sido um tópico de grande interesse da engenharia geotécnica nos últimos 40 anos. Durante este período, a prática da engenharia nesta área evoluiu do emprego de técnicas elementares para procedimentos numéricos bastante complexos. A abordagem mais simples é a análise pseudo-estática na qual o carregamento do terremoto é simulado por uma aceleração horizontal estática equivalente atuando na massa de solo deslizante, utilizando-se um procedimento de equilíbrio limite (método das fatias), geralmente conservativo. O parâmetro que descreve o comportamento dinâmico do solo é referido como coeficiente sísmico k, e sua seleção depende fortemente da experiência e normas técnicas locais, porque não há maneira simples e segura de se escolher um valor adequado. O segundo procedimento é conhecido como método de Newmark, que envolve o cálculo de uma aceleração de escoamento, definida como a força inercial necessária para o fator de segurança atingir 1 em uma análise pseudo-estática pelo método de equilíbrio limite. O procedimento então usa os registros de aceleração do terremoto de projeto e o integra duplamente no tempo para calcular os deslocamentos permanentes acumulados. O terceiro método é referido como análise de Makdisi- Seed, que procura definir a estabilidade sísmica do talude em termos de deslocamentos aceitáveis em vez de um fator de segurança tradicional através de uma versão modificada do método de Newmark. Esta técnica apresenta uma maneira racional de calcular uma aceleração de escoamento média, necessária para produzir um valor do coeficiente de segurança do talude igual a 1. Gráficos específicos foram também desenvolvidos para estimativa dos deslocamentos permanentes, tendo sido bastante aplicados em aterros rodoviários, barragens e aterros sanitários. Finalmente, o mais sofisticado método para análise de estabilidade sísmica de taludes é conhecido como análise dinâmica, que normalmente incorpora modelos de elementos finitos e relações tensão x deformação complexas numa tentativa de obter melhores representações para o comportamento mecânico de taludes sob cargas cíclicas Os resultados destas análises podem incluir a história no tempo dos deslocamentos e tensões, bem como das freqüências naturais, efeitos de amortecimento, etc. Este trabalho apresenta uma comparação entre os métodos mencionados anteriormente, analisando o comportamento sísmico dos taludes da estrutura de contenção dos resíduos de lixiviação de minério de urânio, na Bahia, e dos taludes do bota-fora sul da mina de cobre Toquepala, situada no Peru.
The seismic stability of slopes has been a topic of considerable interest in geotechnical engineering for the past 40 years. During that period, the state of practice has moved from simples techniques to more complicated numerical procedures. The simplest approach is the pseudo-static analysis in which the earthquake load is simulated by an equivalent static horizontal acceleration acting on the mass of the landslide, according to a generally conservative limit equilibrium analysis. The ground motion parameter used in a pseudo-static analysis is referred to as the seismic coefficient k, and its selection has relied heavily on engineering judgment and local code requirements because there is no simple method for determining an appropriate value. The second main procedure is known as the Newmark displacement analysis which involves the calculation of the yield acceleration, defined as the inertial force required to cause the static factor of safety to reach 1 from the traditional limit equilibrium slope stability analysis. The procedure then uses a design earthquake strong-motion record which is numerically integrated twice for the amplitude of the acceleration above the yield acceleration to calculate the cumulative displacements. These displacements are then evaluated in light of the slope material properties and the requirements of the proposed development. The third method is referred to as the Makdisi-Seed analysis sought to define seismic embankment stability in terms of acceptable deformation instead of conventional factors of safety, using a modified Newmark analysis. Their method presents a rational means to determine yield acceleration, or the average acceleration required to produce a factor of safety of unity. Design curves were developed to estimate the permanent earthquake- induced deformations of embankments, which have since been applied to sanitary landfill and highway embankments. Finally, the most sophisticated method for seismic slope stability calculations is known as the dynamic analysis, which normally incorporates a finite element model and a rather complex stress-strain behavior for geological materials in an attempt to obtain a better representation of the behavior of soils under cyclic loading. The results of the analysis can include a time history of displacements and stresses, as well as natural frequencies, effects of damping, etc. This work presents a comparison of the results obtained by the aforementioned approaches, considering the seismic behavior of the slopes of an uranium lixiviation pad situated in Bahia, Brazil, and the South embankment of the waste landfill of the Toquepala Mine, Peru.
Genet, Benjamin. "On monitoring methods and load modeling to improve voltage stability assessment efficiency." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210258.
Повний текст джерелаThe aim of this thesis is the improvement of the voltage stability assessment efficiency. Two orientations are studied: the monitoring methods and the load modeling.
The purpose of the monitoring methods is to evaluate the voltage stability using only measurements and without running simulations.
The first approach considered is local. The parameters of the Thevenin equivalent seen from a load bus are assessed thanks to a stream of local voltage and current measurements. Several issues are investigated using measurements coming from complete time-domain simulations. The applicability of this approach is questioned.
The second approach is global and uses measurements acquired by a Wide-Area Measurement System (WAMS). An original approach with a certain prediction capability is proposed, along with intuitive visualizations that allow to understand the deterioration process leading to the collapse.
The load modeling quality is certainly the weak point of the voltage security assessment tools which run simulations to predict the stability of the power system depending on different evolutions. Appropriate load models with accurate parameters lead to a direct improvement of the prediction precision.
An innovative procedure starting from data of long measurement campaigns is proposed to automatically evaluate the parameters of static and dynamic load models. Real measurements taken in the Belgian power system are used to validate this approach.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Regulski, Pawel Adam. "Estimation of parameters of dynamic load models for voltage stability studies." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/estimation-of-parameters-of-dynamic-load-models-for-voltage-stabily-studies(db6176e0-c7df-4ad6-83f7-5772eb9f8421).html.
Повний текст джерелаKarimishad, Amir. "Transient stability-constrained load dispatch, ancillary services allocation and transient stability assessment procedures for secure power system operation." University of Western Australia. Energy Systems Centre, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0028.
Повний текст джерелаGarmroodi, Doiran Mehdi. "Sensitivity Analysis for Future Grid Stability Studies." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15978.
Повний текст джерелаJadric, Ivan. "Modeling and Control of a Synchronous Generator With Electronic Load." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36549.
Повний текст джерелаMaster of Science
Jiang, Hong. "A graphical interface for the BPA load flow and transient stability programs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq23355.pdf.
Повний текст джерелаColombari, Luan Filipe dos Santos. "An approach to handle sudden load changes on static voltage stability analysis." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-31032017-091235/.
Повний текст джерелаNo contexto de análise estática de estabilidade de tensão, conforme a carga de um sistema de potência cresce, as tensões nas suas barras tendem a cair. Essa redução pode causar a desconexão de geradores e cargas devido a atuação de proteções de subtensão. Esses eventos representam variações abruptas de demanda que alteram o diagrama de equilíbrio de um sistema e sua Margem de Estabilidade de Tensão (MET). Exemplos práticos dessas variações são causados pelo desligamento mandatório de unidades de Geração Distribuída (GD) e pelo Corte de Carga por Subtensão (CCS). Não há estudos detalhados na literatura que trabalham especificamente com essas variações nos parâmetros da carga, nem com as descontinuidades que elas causam no diagrama de equilíbrio de sistemas de potência. Essa dissertação descreve um procedimento especificamente projetado para lidar com essas descontinuidades, de modo que seja possível avaliar seu efeito na MET de sistemas elétricos. Esse método calcula sucessivamente as descontinuidades de carga que existem no diagrama de equilíbrio do sistema em análise. Ele resulta na sequência de variações súbitas de carga que ocorre e no seu impacto no sistema. Quando o método foi aplicado para quantificar o efeito do desligamento mandatório de GD e do CCS, ele apresentou resultados melhores do que o tradicional Fluxo de Carga Continuado (CPFLOW), o qual sofreu problemas de convergência causados pelas descontinuidades em questão. Entretanto, devido ao seu projeto, o método proposto só deve ser utilizado para sistemas de potência que estão sujeitos a várias sucessivas variações abruptas de carga. Por essa razão, esse método não pode ser considerado um substituto do CPFLOW, mas sim como uma técnica capaz de agregar novas funcionalidades a essa ferramenta tradicional, amentando assim seu horizonte de aplicações.
Pozzi, Antonio. "The menisci of the canine stifle: function in load transmission and stability." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1400073280.
Повний текст джерелаNguyen, Tan. "Load transfer mechanisms and seismic stability of embankments subjected to basal subsidence." Kyoto University, 2018. http://hdl.handle.net/2433/235077.
Повний текст джерелаZähe, Bernd, Peter Anders, and Simon Ströbel. "A new energy saving load adaptive counterbalance valve." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200267.
Повний текст джерелаParveen, 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.
Повний текст джерелаAnastasiadis, John S. "Stability of cylindrical laminates by highter order shear deformable theories." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/12376.
Повний текст джерелаYang, Robin S. "Shipboard MVDC Voltage Stabilization by Negative Load Energy Storage Compensated Virtual Capacitance." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/94129.
Повний текст джерелаFuture ships will have a special shipboard power grid and power converters to power future electronics. Most of these power converters will have an internal battery device that provides power when the generators do not provide enough power. Generators are very slow to change their power output. Some shipboard electronics may consume very large amounts of power at very quickly changing rates, causing instability to the power system. The batteries can accomodate the instability caused by these electronics. However, the batteries need to be quickly recharged, which is also unstable to the special power grid. This thesis modifies the recharging behavior so that it does not cause this instability. Also, it is preferable that the batteries will only draw power from the power grid in one direction and send power to the power consuming electronics. This setup is called negative load. This setup is preferable, because sending power back to the power grid will require extra hardware. Ships can only carry so much equipment due to constraints in weight or room, so additonal hardware is undesireable. There already exists similar research to provide this stabilizing service, but they are not designed for a shipboard power grid supporting these quick high power electronics. This thesis also makes a controls system that manages the battery and other requirements of the power system.
Oztop, Celal. "Beforehand Obtaining A Safety Operation Condition By Using Daily Load Curves In Transient Stability And Graphical Software For Transient Stability Applications." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606457/index.pdf.
Повний текст джерелаVadari, Subramanian V. "An intelligent load shedding approach to enhance the voltage stability of a power system /." Thesis, Connect to this title online; UW restricted, 1991. http://hdl.handle.net/1773/6094.
Повний текст джерелаWang, Tianjiao. "Feasibility for spinal muscles creating pure axial compressive load or follower load in the lumbar spine in 3-D postures." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1790.
Повний текст джерелаBahadornejad, Momen. "On-line local load measurement based voltage instability prediction." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16187/1/Momen_Bahadornejad_Thesis.pdf.
Повний текст джерелаBahadornejad, Momen. "On-line local load measurement based voltage instability prediction." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16187/.
Повний текст джерелаPaparo, Maria Ausilia <1983>. "Evaluation of slope stability under water and seismic load through the Minimum Lithostatic Deviation method." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6602/1/Paparo_Maria_Ausilia_tesi.pdf.
Повний текст джерелаPaparo, Maria Ausilia <1983>. "Evaluation of slope stability under water and seismic load through the Minimum Lithostatic Deviation method." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6602/.
Повний текст джерелаGromotovič, Ivan. "Modelování a simulace elektromechanických přechodných jevů v elektrizační soustavě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413126.
Повний текст джерелаLidström, Erica. "Voltage Stability at Hydropower Stations Influenced by close-located Wind Farms." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-181017.
Повний текст джерелаSun, Miao. "Use of Material Tailoring to Improve Axial Load Capacity of Elliptical Composite Cylinders." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29693.
Повний текст джерелаPh. D.
Gozzard, Charles. "Optimisation of cementation, bone graft preparation, stability and load transfer in primary and revision hip arthroplasty." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430174.
Повний текст джерелаKhumalo, Joseph. "An investigation into the effects of load modeling of transient stability and analysis of voltage collapse." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/9645.
Повний текст джерелаThe aim of this thesis is to investigate the effects of load modeling on transient stability studies and to analyze the phenomenon of voltage collapse. In addition, the different generator models are compared and the effects of voltage dips on induction motor performance are investigated. The modeling of loads dates back to the late forties when network analyzers were still in use. The prohibitive computational requirements resulted in many approximations being made to the load models. In turn, this resulted in the use of simple models which did not provide sufficient information about the dynamic behavior of loads. With the advent of digital computers, more accurate load models could be used in dynamic simulations. Despite this improvement in computational tools, the problem of load modeling for stability studies is still very complex. The load composition changes with the time of the day, the consumer's lifestyle, weather, state of the economy and other factors. The accurate load model would include amongst other things, the effects of the abovementioned factors. Since these factors are unpredictable, accurate load modeling becomes very complex indeed. It is mainly for these reasons that the approximate are still widely in use. Ideally, the response of these approximate models should be compared to the actual loads under similar disturbances. A further concern of the thesis is the study of voltage stability. The voltage stability problem has become a matter of growing concern amongst bulk transmission utilities worldwide over the last decade. For long, the stability of a power system was related exclusively to the synchronous stability of the generators.
Jeffs, Shaun B. "The Passive Load-Bearing Capacity of the Human Lumbar Spine in the Neutral Standing Posture." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2638.
Повний текст джерелаČížek, Ondřej. "Stabilita napětí v NN sítích zatížených měniči s aktivní regulací na konstantní výstup." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-317025.
Повний текст джерелаWhitlock, Rogers Jr. "Identification of Power System Stability Using Relevant Modes." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1384.
Повний текст джерелаDamaraju, Avinash Sharma. "Investigation on the Stability of Noncompact and Slender Concrete Filled Tubes Subjected to Axial Loads." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin151179557053975.
Повний текст джерелаSuh, Inyoung. "Determining the load composition in commercial buildings based upon harmonic current characteristics /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерелаMolloy, Sean J. "Finite Element Analysis of a Pair of Leaning Pressurized Arch-Shells Under Snow and Wind Loads." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36608.
Повний текст джерела
The behavior of a pair of pressurized leaning arch-shells with various tilt angles, boundary conditions, and loads is investigated numerically. Several types of loads are considered, including uniformly-distributed vertical loads applied over all or half of the structure (representing snow), and wind loads on the structure. The arches are pinned or fixed to the ground. Deflections, vibrations, and stability of the structures are investigated using the finite element method. The effect of the tilt angle on the response is examined, and buckling may occur for some tilt angles under vertical loading. This type of structure has not been used widely, but may be effective for various applications.
Master of Science
Tamimi, Ala. "Voltage stability limits for weak power systems with high wind penetration." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13100.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Anil Pahwa
Shelli K. Starrett
Analysis of power system voltage stability has practical value in increasing wind penetration levels. As wind penetration levels increase in power systems, voltage stability challenges arise due to locating wind resources far away from load centers. This dissertation presents several different voltage stability methods for sizing new wind farms. Power system wind penetration levels depend on the available voltage stability margins (VSMs) of the existing power system and system load characteristics. Three new iterative methods have been developed to maximize wind penetration level in weak power systems based on systems’ VSMs. The first two methods use an iterative approach for increasing the size of each wind farm until reaching the collapse point. Wind farms with less negative impact on system VSMs are sized larger than others. A third wind farm sizing method has been developed using modal analysis in conjunction with the traditional voltage stability method (Q-V method). Wind farms are placed at buses in the power system which have the lowest negative impact on voltage instability modes (strong wind injection buses). By placing the wind farms at the strongest wind injection buses, higher amounts of wind power can be injected into the power system. To further increase wind penetration in weak power systems, two additional techniques are introduced and applied to the western Kansas power system. The first technique uses modes of voltage instability to place voltage support equipment like static var compensators at locations in the power system where they provide the needed reactive power support for increasing levels of wind penetration. The second technique uses the fact that wind patterns at a wind farm site may rarely allow the wind farm to produce its maximum capacity during the peak loading hours. Wind farm maximum sizes can be increased above their maximum voltage stable size limit without driving the power system into becoming voltage unstable. Preventing voltage collapse for the additional increases in wind farm sizes is accomplished by disconnecting some wind turbines inside the wind farm during critical times to reduce its power output to a voltage stable level.
Roth, George J. "Stability Analysis of a Constant Power Load Serviced by a Buck Converter as the Source Impedance Varies." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17451.
Повний текст джерелаAs the NAVY moves forward with plans to become less dependent on fossil fuels and more dependent on hybrid electric drives and all-electric ships, being aware of the stability issues associated with direct current (DC)-DC and DC-alternating current (AC) power converters and understanding how to solve the issues that come with using them, are very important. The negative input impedance that is observed when using a buck converter servicing a constant power load (CPL) is one of the issues that needs to be understood. Understanding the stability issue caused by the negative input impedance and mitigating this instability by varying the input source impedance is the focus of this thesis. Using a Simulink model of an ideal CPL, we determined the expected results. Then, the Simulink results were compared to the analysis of the linearized small signal transfer function to determine how well the results of the two matched. Finally, the hardware model was observed and its results compared to the Simulink model and linearized small signal transfer function. These experiments led to the conclusion that increasing the capacitance or decreasing the inductance reduces the input source impedance and, ultimately, reduces instability in the system.
Baxant, Radek. "Řešení stability prutových konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227507.
Повний текст джерелаHedkvist, Simon. "Throughflow Study on Bleeding for Part Load Compressor Operation." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75337.
Повний текст джерелаZhou, Yang. "Parametric stability analyses for fluid-loaded thin membranes." Licentiate thesis, KTH, Strukturmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176030.
Повний текст джерелаQC 20151029
Felix, Isbi. "Dynamic analysis of the impact of grid connection of "La Higuera" hydropower plant to the transmission grid." Thesis, KTH, Elektriska energisystem, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118929.
Повний текст джерелаDhasarathy, Deepak. "Estimation of vertical load on a tire from contact patch length and its use in vehicle stability control." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33559.
Повний текст джерела
It was then shown how the estimated load could be used in a control algorithm that applies a suitable control input to maintain the yaw stability of a moving vehicle. A two degree of freedom bicycle model was used for developing the control strategy. A linear quadratic regulator (LQR) was designed for the purpose of controlling the yaw rate and maintaining vehicle stability.
Master of Science
Nord, Thomas. "Voltage Stability in an Electric Propulsion System for Ships." Thesis, KTH, Elektriska energisystem, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118932.
Повний текст джерелаTogiti, Santosh. "Comparative Analysis of Load Flow Techniques for Steady State Loading Margin and Voltage Stability Improvement of Power Systems." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2042.
Повний текст джерелаGedda, Emil, and Anders Eriksson. "Practical analysis of the Precision Time Protocol under different types of system load." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208493.
Повний текст джерелаFörekomsten av distribuerade realtidssystem kräver protokoll för noggrann tidssynkronisering mellan enheter. Ett sådant protokoll, Precision Time Protocol (PTP), kan uppnå en precision på under mikrosekunden under synkronisering. PTP kan implementeras i både hårdvara och mjukvara. Den här rapporten fokuserar på att analysera hur systembelastning kan påverka precision och noggrannheten hos mjukvaruimplementerad PTP mellan två enheter. Testen utfördes på två stycken Intel Galileo Generation 2 kö- randes Linux. Mjukvara användes sedan för att simulera belastning på olika system såsom CPU, I/O, nätverk och på operativsystemet. Data extraherades ifrån loggar från mjukvaran, vilken sammanfattades i grafer för att sedan analyseras. Resultaten visade att precisionen och noggrannheten hos PTP försämras under vissa typer av systembelastningar, mest märkbart under tung I/O belastning. Resultaten är dock potentiellt inte applicerbara på verklighetscenarion på grund av begränsingar i hårdvaran samt att syntetiska stresstest inte motsvarar normal belastning. Ytterligare forskning krävs för att analysera hur och varför olika typer av systembelastning påverkar PTPs precision och noggrannhet.
Rocolle, Guillaume. "Simulation and Experimental Verification of the Flooding and Draining Process of the Tidal Energy Converter “Deltastream” during Deployment and Recovery." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9206.
Повний текст джерелаKhamisi, Ali. "Stability of Tubular Steel Structures : Buckling and Lateral Torsional Buckling." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0172.
Повний текст джерелаThis subject becomes topical following a rapid evolution of design procedures for slender structures used widely in the temporary installations. Only through the last twenty years that these structures are prefabricated of multidirectional frames (steel or aluminium tubular sections). These structures are lightweight and their stability lies only in the internal stiffness at rows of posts and horizontally by the planking as well as the links with the building. This work concerns the study of instabilities (buckling - lateral torsional buckling) taking into account different types of imperfections. New buckling curves and the associated imperfection factors are proposed in this thesis. These curves are obtained by imposing an initial deformed representing the geometrical and mechanical defects (residual stress). The experimental results were confronted with theoretical predictions of Eurocode 3 which show that the values of the imperfections in the literature are extremely exaggerated. The values advocated in this work could be of interest for a possible adjustment of the European buckling curves for this type of structure. Regarding the lateral instability, an original methodology in real scale tests of trusses consist of tubular elements was also developed. The developed loading system of "free wheels" allows releasing the point of application of the force from the beginning of instability. This technique leads to more accurate measurements of the critical lateral torsional buckling moment
Hansson, Henrik, and Martin Ludvigsson. "Praktisk Lastnedräkning och Stomstabilitet enligt Eurokoder." Thesis, KTH, Byggvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174067.
Повний текст джерелаThe Eurocodes, which serve as the Swedish standards for verification of mechanical resistance and stability, are in an ongoing development phase and are sometimes difficult and time consuming to apply in the design process. The standards are continuously adapted to issues debated in the industry and it is important that users of the Eurocodes keep themselves up to date. Indistinct terms and definitions in the Eurocodes create, together with an inconvenient structure, extra work for users. This thesis compiles the necessary information and examines and elaborates terms related to two topics, load distribution and structure stability. Similar to a handbook, this thesis can be used in designer’s everyday work to quickly find the right Eurocodes and help sort out the confusion related to the topics in this thesis. Calculation examples are given as a practical guide where Eurocodes are applied and referred to. The thesis is focused on hand calculations. These hand calculations could act as a base for initial assessments concerning structure dimensions and overall stability as well as a guide during final calculations for construction drawings.
Tbaileh, Ahmad Anan. "Robust Non-Matrix Based Power Flow Algorithm for Solving Integrated Transmission and Distribution Systems." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89362.
Повний текст джерелаPHD