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Dissertations / Theses on the topic 'Jet Vehicle'

Author: Grafiati

Published: 6 September 2023

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1

Nyberg, Ludwig. "Thrust Allocation for Jet Driven Surface Vessels." Thesis, KTH, Mekatronik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271905.

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Dynamic positioning systems have been under development since the first implementation in the early 1960s. The purpose of a dynamic position system is to allow for automatic positioning of a vessel when circumstances do not allow for mooring or anchoring. Historically the development has been driven forward by the offshore industry, while in recent years such systems have been found useful in other parts of the maritime industry as well. However, very few options exist today for jet driven vessels. One of the main parts of a dynamic positioning system is the control allocation. The purpose of

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2

Bergman, Niklas. "Effects of Mach cruise number on conventional civil jet aircraft sizing." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-7450.

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<p>This thesis work was executed at Swift Engineering Incorporated located in San Clemente, California during spring in 2009. Placement supervisor from Swift was Mark Page and advisor and examiner from the Division of future products at Mälardalen University, Sweden was Gustaf Enebog.</p><p>The objective with this thesis work was to examine the effects of fitness ratio, lift over drag, lift coefficient at cruise, winglet span, wing sweep angle, wing aspect ratio, wing area and weights with respect to Mach number for a conventional business jet capable of 18 passengers. The cruise speed study r

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Schumacher, Viking Alex. "Jet Stream Velocity fromAzipod on Stadsgården : A Litterature Study of PIANC W.G. 180Application for Stadsgården." Thesis, KTH, Marina system, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243091.

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The ferry line company VIKING LINE has put in an order for a new vessel with a planned delivery for the year 2020. The vessel will berth and depart daily from the Stockholm port, Stadsgården. The vessel is equipped with two 10 MW Azipod propeller systems. This new propulsion system has the capability of rotating the direction of the propeller thrust 360° which is different from other vessels currently using the same port. The direction and distance of the propeller from the quay has raised concern at the Ports of Stockholm. The integrity and design of the quay wall at Stadsgården is to be rela

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4

Fung, Pearl Haiyan. "Flow control over a micro unmanned aerial vehicle using synthetic jet actuators." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16950.

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5

Ohanian, Osgar John. "Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/27687.

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Ducted fan vehicles possess a superior ability to maximize payload capacity while minimizing vehicle size. Their ability to both hover and fly at high speed is a key advantage for information-gathering missions, particularly when close proximity to a target is essential. However, the ducted fanâ s aerodynamic characteristics pose difficulties for stable vehicle flight and therefore require complex control algorithms. In particular, they exhibit a large nose-up pitching moment during wind gusts and when transitioning from hover to forward flight. Understanding ducted fan aerodynamic b

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6

Wemming, Hannes. "Validation and integration of a rubber engine model into an MDO environment." Thesis, Linköpings universitet, Fluid och mekanisk systemteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-61028.

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Multidisciplinary design optimization (MDO) is a technique that has found use in the field of aerospace engineering for aircraft design. It uses optimization to simultaneously solve design problems with several disciplines involved. In order to predict aircraft performance an engine performance simulation model, also called “rubber engine”, is vital. The goal of this project is to validate and integrate a rubber engine model into an MDO environment. A method for computer simulation of gas turbine aero engine performance was created. GasTurb v11, a commercial gas turbine performance simulation

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7

Kiran, Amit. "Jet noise : aeroacoustic distribution of a subsonic co-axial jet." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/3914/.

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The noise generated by aircraft can be easily heard by those living under the flight path of passenger or cargo carriers. It is considered an environmental pollutant and is treated as such by the International Civil Aviation Organization (ICAO) who monitor and review noise levels. The ICAO imposes substantial fines on those carriers who do not adhere to the decibel limitations. With the new limit or `stage' enforced in 2006, aircraft manufacturers (including jet engine manufacturers) are seeking ways to reduce the noise created by an aircraft. A 1/150th scale model, based on the exit geometry

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8

Muse, Jonathan Adam. "An H-Infinity norm minimization approach for adaptive control." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34830.

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This dissertation seeks to merge the ideas from robust control theory such as H-Infinity control design and the Small Gain Theorem, L stability theory and Lyapunov stability from nonlinear control, and recent theoretical achievements in adaptive control. The fusion of frequency domain and linear time domain ideas allows the derivation of an H-Infinity Norm Minimization Approach (H-Infinity-NMA) for adaptive control architecture that permits a control designer to simplify the adaptive tuning process and tune the uncertainty compensation characteristics via linear control design techniques, band

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9

Luo, Xinfu. "Plasma based jet actuators for flow control." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348870/.

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A set of plasma based jet actuators were designed for flow control applications. The characteristics of these actuators and their flow control applications were studied experimentally in a low speed wind tunnel. A dielectric barrier discharge (DBD) based jet actuator is designed, which is made of a covered cavity with two spanwise aligned parallel slots. Two-component particle image velocimetry (PIV) measurements were conducted to determine the effect of actuator in quiescent air and on a canonical zero pressure gradient turbulent boundary layer. It was found that the designed plasma jet actua

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10

McLaughlin, Philip. "A contribution to the jet noise installation problem." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/190205/.

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The main objective of this thesis is to understand and predict jet noise installation effects for engines mounted below aircraft wings. This is done through a variety of empirical, analytical and computational methods. Aspects of the jet source are examined and a jet source model, suitable for determining installation effects is derived. As part of this research programme a novel and extensive set of model scale jet noise installation effects experiments were undertaken. These results are presented and analyzed in this thesis. A new semi-empirical method, which can readily predict installation

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11

Hu, Xiaowei. "A study of nozzle jet application to winter maintenance vehicles." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447630.

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12

Whitehead, James Anthony. "Aerodynamics and propulsion of synthetic jet based micro air vehicles." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409883.

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13

Preston, Giles Andrew. "Modelling sound source regions for the prediction of coaxial jet noise." Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/173779/.

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14

Azarpeyvand, Mahdi. "Some aspects of RANS based jet noise prediction." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/66622/.

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15

Perera, Guruge Elmo Lakshman. "A vertical axis wind turbine generator based on the tangential wall-jet action." Thesis, University of Huddersfield, 1988. http://eprints.hud.ac.uk/id/eprint/7480/.

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16

Bassetti, Alessandro. "A statistical jet-noise model based on the acoustic analogy and a RANS solution." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/64784/.

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We introduce a hybrid model for the evaluation of jet noise. The model uses the information from a solution of the Reynolds-averaged Navier{Stokes equations (RANS). It evaluates the jet-noise power spectral density (PSD) in the quiescent region outside the turbulent jet. It includes the following components: 1. A propagation model based on the high- and low-frequency approximations of the Lilleyanalogy Green's function. The high-frequency approximation is determined by combining a moving-medium Lighthill analogy and ray acoustics. The low-frequency model is made by using a ow-factor approach o

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17

Al, Haddabi Naser Hamood. "Subsonic open cavity flows and their control using steady jets." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/9096/.

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Cavity flow induces strong flow oscillations, which increase noise, drag, vibration, and structural fatigue. This type of flow impacts a wide range of low speed applications, such as aircraft wheel wells, ground transportations, and pipelines. The objective of the current study is to examine the reverse flow interaction inside the cavity, which has a significant impact on the cavity flow oscillations. The study also investigates the impact of steady jets with different-configurations on the time-average field and the oscillations of the cavity separated shear layer. The purpose of the steady j

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18

Toulson, Elisa. "Applying alternative fuels in place of hydrogen to the jet ignition process /." Connect to thesis, 2008. http://repository.unimelb.edu.au/10187/3532.

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19

Lawrence, Jack. "Aeroacoustic interactions of installed subsonic round jets." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/367059/.

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Additional noise sources are generated when an aircraft engine is mounted beneath a wing. The two main installation sources include: (1) reflection of the exhaust jet mixing noise from the underside of the wing, and (2) interaction between the turbulent jet plume and the trailing edge of the wing, or deployed flap. The strength, directivity and frequency content of these particular sources all serve to increase the time-averaged flyover aircraft noise level heard on the ground by residents beneath the flight path. As the bypass ratio and nacelle diameter of modern turbofan engines continues to

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20

Gildner, Matthew Lee. "Framework for multi-vehicle adaptive sampling of jets and plumes in coastal zones." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/80664.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 125-130).<br>This thesis presents a framework for the sampling of thermal and effluent jets and plumes using multiple autonomous surface vehicles. The framework was developed with the goal of achieving rapid and accurate in-situ measurement and characterization of these features. The framework is presented as a collection of simulation, estimation and field tools for use within the Mission Oriented Operations Suite (MOO

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21

Beales, Brian O. "F-22 versus UCAV fixing today's deficiencies leaves questions about tomorrow's dominance." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FBeales.pdf.

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Thesis (M.A. in Security Studies (Homeland Security and Defense))--Naval Postgraduate School, December 2009.<br>Thesis Advisor(s): Looney, Robert E. ; McNab, Robert M. "December 2009." Description based on title screen as viewed on January 27, 2010. Author(s) subject terms: F-22, MQ-1, MQ-9, UCAV, homeland defense, aircraft effectiveness, defense spending, manned flight, unmanned flight. Includes bibliographical references (p. 71-76). Also available in print.

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22

Zakaria, Rami. "Jet fuel spray characterisation using optical methods : an experimental study of high speed fuel injection systems in small rotary engines." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/54103/.

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This thesis was initiated by the need to develop a stable low vibration engine with a high power to weight ratio. A new rotary (Wankel) engine was chosen to meet these requirements. A further operating criterion was that the engine was required to use JP8 (aviation fuel). The difficulty created by the use of JP8 is that its combustion temperature is higher than other conventional fuels, and preheating is necessary, especially in the case of cold start. Thus, the question posed was, could a more appropriate and efficient method of fuel delivery be devised? This thesis presents the design and co

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23

Hennig, Christian [Verfasser]. "Improvements in thrust and fuel consumption for future jet engines for unmanned aerial vehicles (UAV) using variable cycle technology / Christian Hennig." München : Verlag Dr. Hut, 2017. http://d-nb.info/1139539094/34.

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24

Krolak, Matthew Joseph. "Optimization of a magnetoplasmadynamic arc thruster." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-042607-155701/.

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25

Jewkes, James. "An improved turbulent boundary layer inflow condition, applied to the simulation of jets in cross-flow." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/2372/.

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The jet acting perpendicular to a cross-flow boundary layer is a commonly studied complex turbulent flow. Our research was motivated by their potential application in separation delay devices, where jets can be used to produce streamwise vortices in a similar manner to conventional solid vortex generating vanes. This thesis addresses two problems; firstly the generation of inflow conditions for the simulation of a spatially developing turbulent boundary layer, and secondly the simulation of low velocity ratio jets interacting with the boundary layer. Our approach involved refining a popular tu

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26

Littlewood, Rob. "Novel methods of drag reduction for squareback road vehicles." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12534.

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Road vehicles are still largely a consumer product and as such the styling of a vehicle becomes a significant factor in how commercially successful a vehicle will become. The influence of styling combined with the numerous other factors to consider in a vehicle development programme means that the optimum aerodynamic package is not possible in real world applications. Aerodynamicists are continually looking for more discrete and innovative ways to reduce the drag of a vehicle. The current thesis adds to this work by investigating the influence of active flow control devices on the aerodynamic

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27

Schroeder, Olivia. "Verification and Validation Studies for the KATS Aerothermodynamics and Material Response Solver." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/122.

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Modeling the atmospheric entry of spacecraft is challenging because of the large number of physical phenomena that occur during the process. In order to study thermal protection systems, engineers rely on high fidelity solvers to provide accurate predictions of both the thermochemical environment surrounding the heat shield, and its material response. Therefore, it is necessary to guarantee that the numerical models are correctly implemented and thoroughly validated. In recent years, a high-fidelity modeling tool has been developed at the University of Kentucky for the purpose of studying atmo

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28

Serdane, Thierry. "Le jeu vidéo, un art mécanique ? : se réapproprier la contre-culture." Thesis, Montpellier 3, 2014. http://www.theses.fr/2014MON30093/document.

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De la confrontation problématique d’un projet de jeu vidéo aux conditions plurielles desa création, ce travail de thèse tente de mettre à jour les contraintes et les interrogationsqu’elles suscitent. Le jeu vidéo, contemporain de la société de l’information est un témoinde l’évolution complexe du paradigme postmoderne, né avec la cybernétique. De la genèsedu jeu vidéo au temps présent, les technologies, les façons de jouer et les productions serévèlent significatives de visions du monde opposées. La thèse montre que derrière l’imaged’un divertissement et d’une industrie consensuelle, une résis

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29

Raszka, Aleš. "Klasifikace vozidel s použitím radaru." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363896.

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This Master thesis deals with usage of radar signal for vehicle classification. The thesis uses radar modules with continuous wave based on Doppler effect. Radar signal is processed by a series of signal processing method finished by Fourier transform. Data produced by FFT is used to create SVM and AdaBoost classifier which can be used to classify vehicles into groups.

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Adler, Martin, Stefanie Peer, and Tanja Sinozic. "Autonomous, connected, electric shared vehicles (ACES) and public finance: An explorative analysis." Elsevier, 2019. http://epub.wu.ac.at/7200/1/main.pdf.

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This paper discusses the implications of autonomous-connected-electric-shared vehicles (ACES) for public finance, which have so far been widely ignored in the literature. In OECD countries, 5-12% of federal and up to 30% of local tax revenues are currently collected from fuel and vehicle taxation. The diffusion of ACES will significantly reduce these important sources of government revenues and affect transport-related government expenditures, unless additional policies are introduced to align the new technological context with the tax revenue requirements. We argue that the realization of soc

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31

Korzun, Ashley Marie. "Aerodynamic and performance characterization of supersonic retropropulsion for application to planetary entry and descent." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43667.

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Supersonic deceleration has been identified as a critical deficiency in extending heritage technologies to the high-mass systems required to achieve long-term exploration goals at Mars. Supersonic retropropulsion (SRP), or the use of retropropulsive thrust while an entry vehicle is traveling at supersonic conditions, is an approach addressing this deficiency. The focus of this dissertation is aerodynamic and performance evaluation of SRP as a decelerator technology for high-mass Mars entry systems. This evaluation was completed through a detailed SRP performance analysis, establishment of t

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32

Chaligné, Sébastien. "Contrôle du sillage d'un corps non profilé : application expérimentale à une maquette simplifiée de véhicule industriel." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00995837.

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Ce manuscrit présente les travaux de thèse réalisés dans le cadre d'une convention CIFRE entre Renault Trucks et le LMFA. Une stratégie de contrôle d'écoulement, associant un volet déflecteur et des actionneurs de type jets pulsés et synthétiques, est étudiée expérimentalement en vue de réduire la traînée aérodynamique de corps non profilés à culot droit. Une première approche consiste à étudier l'influence de cette stratégie sur une maquette bidimensionnelle. Des mesures de vitesse dans le sillage proche par TR-PIV et par anémométrie à fil chaud démontrent qu'une certaine gamme de fréquence d

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33

Birhanie, Habtamu. "Resource Allocation in Vehicular Fog Computing for an Optimal Use of EVs Electric Vehicles Energy." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK042.

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Résumé : Les progrès technologiques ont permis aux véhicules électriques d’avoir des capacités à la fois de calcul, de communication, de stockage et de perception. Néanmoins, la plupart du temps, ces véhicules électriques sont en stationnement, ce qui engendre une sous utilisation de leurs capacités embarquées. Ainsi, une meilleure gestion et une mise en commun de ces ressources sous-utilisées deviennent fortement recommandées. Les ressources agrégées seraient utiles pour des applications de sécurité routière, des applications liées au confort ou pourraient même être utilisées en tant que cent

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34

Matucha, Tomáš. "Nezávislý nízkonapěťový trakční asynchronní pohon." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233490.

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This work deals with creation of an exact mathematical model of a traction drive with low-voltage induction machine (28 V) which is fed from accumulators. This model was developed in MATLAB – Simulink and consists of induction machine model, inverter model and load model. Vector Control was added to models connected together. This complex model allows considering many effects into simulations. These effects are commonly neglected, although they have significant influence on drive behaviour, especially by using low-voltage machine. It is impact of magnetic circuit saturation, impact of temperat

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35

Tošer, Pavel. "Zkoumání teplotních změn vlastností olověného akumulátoru v režimu hybridních vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218567.

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The oldest and also most used type of secondary cells is lead-acid accumulator. Basic functional principle stayed same as in foundation time, only operation parameters are still improving (for example one of the most important is lifetime). Significant technical problem is temperature of lead-acid battery and her influence on functionality and running reactions. Master thesis is focused on this section, when is necessary to evaluate new pieces of knowledge in development. The work deals with description existing types of accumulators, further deals with theory of temperature balance and in the

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36

Mariette, Kevin. "Contrôle en boucle fermée pour la réduction active de traînée aérodynamique des véhicules." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI088.

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Le contrôle actif de l’écoulement à l’arrière des véhicules se déplaçant à grande vitesse est un moyen de diminuer efficacement la consommation énergétique des véhicules par la réduction de la traînée aérodynamique. L’intérêt des méthodes actives est leur possible adéquation avec des conditions environnementales variables pour une modification minimale de la forme des véhicules, contrairement aux systèmes exclusivement passifs (profilage, ailerons aérodynamiques …). Toutefois, le contrôle actif nécessite un apport d’énergie qui réduit sa rentabilité énergétique finale. À l’aide d’essais expéri

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37

CHEN, YU-HENG, and 陳昱恆. "The Study on the Performance and Design Analysis of the Pump-Jet for Amphibious Wheel Type Vehicle." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/w2r35u.

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38

Miller, Warrick Alan. "Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles." Thesis, 2019. http://hdl.handle.net/2440/120374.

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Air-breathing hypersonic vehicles have an engine which is tightly integrated with the airframe. This integration leads to complex dynamic characteristics, such as propulsion-pitch coupling. As a result, air-breathing hypersonic vehicles tend to be unstable and high frequency control is required to maintain steady flight. To provide high frequency control, aerodynamic control surfaces may need to be supplemented or replaced by high frequency actuators. Reaction control (RC) jets are an attractive solution, as they are commonly used to supplement aerodynamic control surfaces for exo-atmospheric

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39

Gangadharan, Sathya Narayan. "Feasibility study of jet propulsion for remote operated underwater vehicles /." 1986. http://collections.mun.ca/u?/theses2,4018.

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40

Toulson, E. "Applying alternative fuels in place of hydrogen to the jet ignition process." 2008. http://repository.unimelb.edu.au/10187/3532.

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Hydrogen Assisted Jet Ignition (HAJI) is an advanced ignition process that allows ignition of ultra-lean mixtures in an otherwise standard gasoline fuelled spark ignition engine. Under typical operating conditions, a small amount of H2 (~ 2 % ofthe main fuel energy or roughly the equivalent of 1 g/km of H2) is injected just before ignition in the region of the spark plug. By locating the spark plug in a small prechamber (less than 1 % of the clearance volume) and by employing a H2 rich mixture, the content of the prechamber is plentiful in the active species that form radicals H and OH on deco

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41

Lopez, Mejia Omar Dario. "Computational study of a NACA4415 airfoil using synthetic jet control." 2009. http://hdl.handle.net/2152/10683.

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Synthetic jet actuators for flow control applications have been an active topic of experimental research since the 90’s. Numerical simulations have become an important complement of that experimental work, providing detailed information of the dynamics of the controlled flow. This study is part of the AVOCET (Adaptive VOrticity Control Enabled flighT) project and is intended to provide computational support for the design and evaluation of closed-loop flow control with synthetic jet actuators for small scale Unmanned Aerial Vehicles (UAVs). The main objective is to analyze active flow control

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