Дисертації з теми "Wind tunnel balance"
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Katirci, Argun. "Automation And Verification Of Ankara Wind Tunnel." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12607692/index.pdf.
Повний текст джерелаs test that was performed at NASA Langley Research Center.
Kayisoglu, Bengi. "Investigation Of Wind Effects On Tall Buildings Through Wind Tunnel Testing." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613324/index.pdf.
Повний текст джерелаParker, David Huw. "Techniques for extreme attitude suspension of a wind tunnel model in a magnetic suspension and balance system." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/52256/.
Повний текст джерелаEdwards, Alex T. "Comparison of Strain Gage and Fiber Optic Sensors On A Sting Balance In A Supersonic Wind Tunnel." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/30799.
Повний текст джерела
This thesis considers an initial trial application of new fiber optic sensors on a conventional, six-component sting balance while retaining the original foil strain gage sensors for comparison. Tests were conducted with a blunt, 10º half-angle cone model in the Virginia Tech 9x9 inch Supersonic Wind Tunnel at Mach 2.4 with a total pressure of 48 psia and ambient total temperature of 25.3ºC. Results showed a close comparison between the foil strain gages and the fiber optic sensor measurements, which were set up to measure the normal force and pitching moment on the blunt cone model. A Finite Element Model (FEM) of the sting balance was produced in order to determine the best locations for the fiber optic sensors on the sting balance. Computational Fluid Dynamics (CFD) was also used in order to predict and compare the results acquired from all of the sensors.
Master of Science
Lines, Philipp A. "Upgrade of a LabVIEW based data acquisition system for wind tunnel test of a 1/10 scale OH-6A helicopter fuselage." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FLines.pdf.
Повний текст джерелаThesis advisor(s): E. Roberts Wood, Richard M. Howard. Includes bibliographical references (p. 53-54). Also available online.
Nacakli, Yavuz. "Detailed Measurements Of Dynamic Stability Derivatives Under Roll Oscillations For Standard Dynamic Model In Ankara Wind Tunnel." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1206846/index.pdf.
Повний текст джерелаFryšták, Lukáš. "Aerodynamická optimalizace monopostu formule SAE." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254335.
Повний текст джерелаBroughton, Benjamin Albert. "Low speed wind tunnel testing and data correction methods for aircraft models in ground effect." Diss., University of Pretoria, 1999. http://hdl.handle.net/2263/24292.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 1999.
Mechanical and Aeronautical Engineering
unrestricted
Sevier, Abigail. "Feasibility Study for Testing the Dynamic Stability of Blunt Bodies with a Magnetic Suspension System in a Supersonic Wind Tunnel." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1493207020743959.
Повний текст джерелаChen, Ru-Ching. "Development of a Supersonic Nozzle and Test Section for use with a Magnetic Suspension System for Re-Entry Aeroshell Models." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544179612537658.
Повний текст джерелаNaim, Wadih. "Study of The Effect of Convective Heat Transfer on Cooling of Overhead Line Conductors Based on Wind Tunnel Experimental Results." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235197.
Повний текст джерелаDet är viktigt att hålla en kraftöverföringsledning inom nominella driftsförhållanden.Således leder en korrekt förutsägelse av ledarens termiska och elektriska beteende till en ökad tillförlitlighet och effektivitet. Under DLR-drift justeras nuvärdet baserat på omgivande väder och solförhållanden för att möjliggöra dynamisk belastning. Klassificeringsjusteringen tar hänsyn till de kylmekanismer som verkar på ledaren. I denna avhandling studeras kylning med hjälp av konvektiv värmeöverföring baserat på provning av vindtunnel av tre olika ledartyper. Konvektion bidrar till det mesta av kylningen. Det påverkas dock av vindhastighet och riktning. Två angreppsvinkelar studerades (40◦ och 90◦), där vinkelrätt flöde befanns resultera i bättre kylning. Placeringen av ytskiktseparationen har stor inverkan på ytfördelningen av kylning, vilken är ojämn. Skrå vindflöde resulterar i minskning av den totala kylningen på grund av tidigare separering av gränsskiktet. Slutligen korrelerar den ytvärdesöverföringskoefficienten för ytvärdet icke-linjärt med Reynolds-talet, där högre vindhastigheter och större ledardiametrar kan leda till signifikanta förbättringar i kylning samtidigt som relativt låga strömtäthet hålls. De befintliga standarderna för IEEE och CIGRE visade sig överskatta effekten av konvektiv kylning för de specifika experimentellafallen.
Brožek, Petr. "Návrh zařízení pro měření aerodynamických sil a momentů v aerodynamickém tunelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231647.
Повний текст джерелаMurch, Austin Matthew. "Aerodynamic Modeling of Post-Stall and Spin Dynamics of Large Transport Airplanes." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/18855.
Повний текст джерелаZedník, Roman. "Příprava experimentálního měření aerodynamických charakteristik na zmenšeném modelu automobilu v aerodynamickém tunelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417795.
Повний текст джерелаOliveira, Mário Gustavo Klaus. "Desenvolvimento de uma balança dinâmica de três graus de liberdade para estudo dos efeitos de flexo-torção em edifícios altos submetidos à ação do vento." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/18417.
Повний текст джерелаMeasurements performed in full-scale high rise buildings have shown that wind loading may cause important torsional effects. The current trend of building construction, with new shapes and complex structural systems promotes an increase in the distances (eccentricities) among the center of mass, elastic center and the instantaneous point of application of the resulting wind loads. Furthermore, modern tall buildings are becoming increasingly light and slender, diminishing the trigger wind speed of some phenomena such as galloping and torsional flutter, bringing these velocities closer to the design wind speeds. Therefore, wind induced bending and torsional dynamic effects in tall buildings play an important role in the design of modern structures. The current analytical methods for the response determination of tall buildings under wind loading do not lead to reliable results for the non regular building shapes, as well as do not consider torsional effects. Also, its use is not recommended for the case of very flexible structures, where the structure´s own motion may affect the aerodynamic forces acting on it. In these situations, the best option for engineers is a more detailed study of the wind effects, through boundary layer wind tunnels. The aim of this study is the development of a device that allows the determination of the response of tall buildings under wind loading, through wind tunnel tests with reduced scale models. The goal is the determination of the responses in terms of its mean and fluctuating components. It is assumed that the dynamic parcel contemplates the two fundamental bending modes of vibration, orthogonal and linear, as well as the torsional mode, which is assumed constant along the height. The adopted simplifications allow for a low complexity in the process of model design and construction as well as for a very low modeling cost, making more efficient the whole testing process. To validate the device, tests were performed with a reduced scale model of the CAARC Standard Tall Building, which is taken as a standard for the calibration of aeroelastic modeling techniques, in Prof. Joaquim Blessmann boundary layer wind tunnel of the Federal University of Rio Grande do Sul. The obtained results were compared with other researchers' values as well as with results obtained from pressure measurements, in a rigid model. The agreement among the compared values allows the conclusion that the device simulates satisfactorily well the dynamic behaviour of high rise buildings under wind loading, even for aeroelastic phenomena such as the resonance due to vortex shedding. It was also verified the importance of the wind induced torsional effects and the need for its proper consideration in the design process.
Luke, Mark Elden. "Predicting Drag Polars For Micro Air Vehicles." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd297.pdf.
Повний текст джерелаAndrade, Nixon Cesar de 1976. "Estudo da ventilação natural em edificações com captadores de vento multidirecionais por meio de ensaios em túnel de vento e simulações computacionais." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258056.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-24T13:55:02Z (GMT). No. of bitstreams: 1 Andrade_NixonCesarde_D.pdf: 32217441 bytes, checksum: 25e8b1672ea93f3aae90a2513264ae3e (MD5) Previous issue date: 2013
Resumo: A ventilação natural é uma das estratégias mais adequadas para o resfriamento passivo dos edifícios e para a manutenção da qualidade do ar. Uma das alternativas existentes para se alcançar tal proposição é a utilização de torres de vento situadas acima do nível da cobertura, as quais podem funcionar como captadores ou extratores de ar. Esta pesquisa tem como objetivo geral avaliar quatro tipos de torres, atuando como captadores: a unidirecional, com uma abertura para a entrada de vento, em locais onde o vento se movimenta predominantemente em uma direção; a tetradirecional, com quatro aberturas; a octodirecional, com oito aberturas e a dodecadirecional, com doze aberturas; em locais em que o vento age em várias direções. Para alcançar o objetivo utilizaram-se ensaios em túnel de vento e simulações no software CFX®, os quais permitiram estudar as características técnicas das torres analisadas e seus efeitos sobre a ventilação interna do ambiente, bem como contribuir para a difusão desse sistema de ventilação no Brasil. O desenvolvimento do trabalho foi dividido nas seguintes etapas: definição das geometrias das torres; definição, construção e instrumentação das maquetes; definição dos ângulos de incidência do vento; ensaios no túnel de vento e simulações no software CFX®: velocidade e pressão. Os resultados obtidos a partir de uma série de experimentos e simulações computacionais permitiram a análise e comparação dos diversos projetos propostos, auxiliando, portanto, na determinação das configurações mais adequadas, além da verificação da compatibilidade entre os dois tipos de estudo, concluindo que as torres octodirecional e dodecadirecional são as mais eficientes, pois proporcionam maiores valores de velocidade do ar interno na maioria das posições consideradas. Desta forma, utilizando o túnel de vento e o CFX®, as análises possibilitaram desenvolver melhorias para os ambientes avaliados, no que se refere ao desempenho da ventilação. Isso proporcionará melhores taxas de conforto aos usuários da edificação, considerando todas as aberturas para permitir o fluxo do vento em qualquer situação. Ademais, podem-se verificar as distribuições das aberturas de entrada e saída mais adequadas para captação e distribuição do vento no interior dos ambientes, proporcionando melhores condições de conforto térmico
Abstract: Natural ventilation is one of the most appropriate strategies for passive cooling of buildings and the maintenance of air quality. One of the alternatives for achieving such proposal is the use of wind towers above the level of the roof, which can function as air catchers or extractors. This research aims to evaluate four types of towers, acting as air catchers: unidirectional, with an opening for the entrance of the wind, in locations where the wind moves predominantly in one direction, the tetradirectional, with four openings, the octodirectional, with eight openings and dodecadirectional, with twelve openings, in locations where the wind moves in various directions. To achieve the goal, tests in wind tunnel and simulations in CFX® software were performed, which allowed the study of the technical characteristics of the analyzed towers and their effects on the indoors ventilation, as well as the contribution to the spread of this ventilation system in Brazil. The methodology was divided into the following steps: the definition of the geometry of the towers; definition, construction and instrumentation of the models; definition of the angles of the incidence of the wind; wind tunnel tests and simulations in CFX® software: speed and pressure. The obtained results from a series of experimental and computational simulations allowed the analysis and comparison of the various proposed design configurations, helping, therefore, in determining the most appropriate settings, besides the verification of compatibility between the two types of study, concluding that the octodirectional and dodecadirectional towers are the most efficient ones , as they provide higher rate of indoor air speed in most considered positions. Thus, using the wind tunnel and CFX®, the analysis allowed the development of enhancements to the analyzed environments, concerning the performance of the ventilation. This will provide better comfort rates to the users of the building, considering all openings to allow the wind flow in any situation. Furthermore, the most suitable distribution of inlet and outlet openings for the catchment and distribution of the wind within the environments may be verified, providing better conditions of thermal comfort
Doutorado
Arquitetura e Construção
Doutor em Engenharia Civil
Pieterse, Frederik Francois. "The application of optical fibre Bragg grating sensors to an internal wind tunnel balance." Thesis, 2012. http://hdl.handle.net/10210/4756.
Повний текст джерелаConventional internal wind tunnel balances are designed and constructed to accommodate foil strain gauges which measure the deformation (strain) of the material. Foil strain gauge balances are known to be affected by electromagnetic interference and temperature. These balances are expensive and their manufacture is time consuming. With an increasing demand for higher accuracy, stiffness, increased resolution and temperature compensation, current balance designs are becoming inadequate. To overcome identified balance deficiencies a research programme in the application of optical Bragg gratings to wind tunnel balances was initiated. In this programme a new concept of using optical fibre Bragg grating sensors, with the advantage of using mechanical amplification to increase sensitivity, and the implementation of temperature compensation techniques was demonstrated on a simulated two component balance.
Hidore, John Preston. "Investigation of Data Quality for Wind Tunnel Internal Balance Testing." Thesis, 2013. http://hdl.handle.net/1969.1/149384.
Повний текст джерела"Evaluation of optical fibre Bragg grating sensors on a sidewall wind tunnel balance." Thesis, 2015. http://hdl.handle.net/10210/13810.
Повний текст джерелаPieterse, Frederik Francois. "Design and development of a three component strain gauge wind tunnel balance." Thesis, 2012. http://hdl.handle.net/10210/7055.
Повний текст джерелаIn today's world with its competitive environment there is a need to shorten product development time by using CFD (Computational Fluid Dynamics) to design an object for example a car, aeroplane or missile and to predict the forces that the wind will have on the object (design). To evaluate the correctness of the CFD results, the design or a scale model of the design must be tested in a wind tunnel by using a force balance. The wind tunnel balance is an apparatus used in the designing and testing of wings, shapes and profiles. In general a balance can be used in all aerodynamic designs to determine the forces on an object when it is moving through air. The aim of this project was to design and manufacture a three-component external balance for a low-speed wind tunnel using an axiomatic design method. It also covers the installation of the external wind tunnel balance to a wind tunnel with a computerized data acquisition capturing system, and performance evaluation of the wind tunnel balance.
Bidgood, Peter Mark. "Internal balance calibration and uncertainty estimation using Monte Carlo simulation." Thesis, 2014. http://hdl.handle.net/10210/9728.
Повний текст джерелаThe most common data sought during a wind tunnel test program are the forces and moments acting on an airframe, (or any other test article). The most common source of this data is the internal strain gauge balance. Balances are six degree of freedom force transducers that are required to be of small size and of high strength and stiffness. They are required to deliver the highest possible levels of accuracy and reliability. There is a focus in both the USA and in Europe to improve the performance of balances through collaborative research. This effort is aimed at materials, design, sensors, electronics calibration systems and calibration analysis methods. Recent developments in the use of statistical methods, including modern design of experiments, have resulted in improved balance calibration models. Research focus on the calibration of six component balances has moved to the determination of the uncertainty of measurements obtained in the wind tunnel. The application of conventional statistically-based approaches to the determination of the uncertainty of a balance measurement is proving problematical, and to some extent an impasse has been reached. The impasse is caused by the rapid expansion of the problem size when standard uncertainty determination approaches are used in a six-degree of freedom system that includes multiple least squares regression and iterative matrix solutions. This thesis describes how the uncertainty of loads reported by a six component balance can be obtained by applying a direct simulation of the end-to-end data flow of a balance, from calibration through to installation, using a Monte Carlo Simulation. It is postulated that knowledge of the error propagated into the test environment through the balance will influence the choice of calibration model, and that an improved model, compared to that determined by statistical methods without this knowledge, will be obtained. Statistical approaches to the determination of a balance calibration model are driven by obtaining the best curve-fit statistics possible. This is done by adding as many coefficients to the modelling polynomial as can be statistically defended. This thesis shows that the propagated error will significantly influence the choice of polynomial coefficients. In order to do this a Performance Weighted Efficiency (PWE) parameter is defined. The PWE is a combination of the curve-fit statistic, (the back calculated error for the chosen polynomial), a value representing the overall prediction interval for the model(CI_rand), and a value representing the overall total propagated uncertainty of loads reported by the installed balance...
Alves, Pedro Jorge Ferreira. "Low Reynolds Number Propeller Performance Measurement in Wind Tunnel Test Rig." Master's thesis, 2014. http://hdl.handle.net/10400.6/6454.
Повний текст джерелаO objetivo do trabalho levado a cabo nesta tese foi dotar o túnel de vento da Universidade da Beira Interior de um equipamento de medição de desempenho de hélices de baixo número de Reynolds. Esta condição veri ca-se em casos da aplicação em pequenos Veículos Aéreos Não Tripulados (VANTs) ou aeronaves que operem a grande altitude, como é o caso dos dirigíveis no projeto MAAT-Multybody Advanced Airship for Transport. O sistema de medição foi desenvolvido para recolher dados de desempenho de hélices com um diâmetro compreendido entre 6 e 14 polegadas (aprox. 0,15 a 0,40 m), operando num número de Reynolds compreendido entre 30.000 a 300.000 (baseado na corda a 3=4 do raio da pá). O conceito escolhido para a estrutura da balança desenvolvida para a medição da tração, consiste num pêndulo em forma de T que se assemelha ao originalmente construído na Universidade de Illinois em Urbana-Champaign (UIUC). Devido ao posicionamento ajustável de célula de carga, esta con guração permite a utilização de toda a escala da célula de carga para a maioria das condições de funcionamento das hélices propostas. A conceção, construção e validação de todo o mecanismo e procedimentos de medição são apresentados detalhadamente. Além disso, foi medido o desempenho de duas hélices da gama CAM Carbon do fabricante Aeronaut, a de duas pás 13x8 e a de três pás 12x8 . Foi demonstrado que, o aumento do número de Reynolds associado ao aumento das RPM, tem uma in uência considerável no desempenho das hélices, aumentando a sua e - ciência e coe ciente de tração. A instalação experimental desenvolvida pode ser utilizada para diversos ns, nomeadamente: o projeto de hélices no seio do Departamento de Ciências Aeroespaciais da UBI; para os trabalhos de desenvolvimento de VANTs, bem como para a validação e aperfeiçoamento de ferramentas numéricas como é o JBLADE.