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Dissertations / Theses on the topic 'Air Rotor'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Garratt, John Edward. "Mathematical modelling of air-rotor-stator interactions in high-speed air-riding bearing and seal technology /." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580292.

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Air-riding bearing and seal technology comprises rotor and stator elements separated by a thin air-film and experiencing relative rotational motion. The Navier- Stokes equations for compressible flow lead to a modified Reynolds equation incorporating additional high-speed rotation effects. The dynamics of the system are investigated when the axial position of the stator is prescribed by a finite amplitude periodic forcing. Two different physical configurations of air-riding technology are considered in this thesis; a squeeze-film thrust bearing and a pressurised air-riding face seal. Details a
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2

Fitchett, Brandon K. "Development and investigation of a flapping rotor for micro air vehicles." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7224.

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Thesis (M.S.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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3

Bellia, J. M. "Aerodynamic measurements on a small HAWT rotor in axial and yawed flow." Thesis, Cranfield University, 1990. http://hdl.handle.net/1826/4290.

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Current wind turbine performance codes are not yet able to predict the rotor aerodynamic behaviour with sufficient certainty. This has led to both the over-design of blades and to operational restrictions in certain wind conditions. Essentially the problem is one of aerodynamic stall. Steady 3-dimensional stall can occur near the blade root in high wind conditions and may produce more power than predicted. Dynamic stall can also be expected due to the effects of yawed operation, turbulence, tower shadow and the earth's boundary layer. The main aim of this work is to provide a coherent set of m
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4

Forshaw, Jason Leigh. "Transitioning flight guidance and control for a twin rotor tailsitter unmanned air vehicle." Thesis, University of Surrey, 2013. http://epubs.surrey.ac.uk/837960/.

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The future of aircraft lies in highly intelligent vehicles which are able to adapt themselves to different missions and take-off and land anywhere. Tailsitters, aircraft capable of controlled transitions between horizontal flight (like a fixed-wing aircraft) and vertical flight (like a rotary-wing aircraft), are one such form of vehicle. The focus of this research stems from a collaboration between the Surrey Space Centre and QinetiQ involving a new class of VTOL tailsitter - the QinetiQ Eye-On™ UAV - which offers uniqueness from all other known tailsitters in its use of twin helicopter rotors
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5

Macdonald, John Charles. "Efficient Estimation for Small Multi-Rotor Air Vehicles Operating in Unknown, Indoor Environments." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3496.

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In this dissertation we present advances in developing an autonomous air vehicle capable of navigating through unknown, indoor environments. The problem imposes stringent limits on the computational power available onboard the vehicle, but the environment necessitates using 3D sensors such as stereo or RGB-D cameras whose data requires significant processing. We address the problem by proposing and developing key elements of a relative navigation scheme that moves as many processing tasks as possible out of the time-critical functions needed to maintain flight. We present in Chapter 2 analysis
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6

Jarvis, Ross Geoffrey. "Air Rotor Interproximal Reduction The Development Of A Bur For Use In Posterior Teeth." Thesis, Faculty of Dentistry, 1988. http://hdl.handle.net/2123/4241.

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7

Van, der Spuy Sybrand Johannes. "The design of a low-noise rotor-only axial flow fan series." Thesis, Stellenbosch : University of Stellenbosch, 1997. http://hdl.handle.net/10019.1/20977.

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ENGLISH ABSTRACT: A design routine was derived for designing a series of rotor-only axial flow fans. The routine was applied by designing two different series of axial flow fans. The first design was for a general application rotor-only axial flow fan. This fan series was designed, built and tested in co-operation with Howden Air Industries for both research and commercial purposes. The second design was for a low-noise fan series, which was designed, built and tested by the University of Stellenbosch for research purposes only. The design theory used the principle of blade cropping, me
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8

Bohorquez, Felipe. "Rotor hover performance and system design of an efficient coaxial rotary wing micro air vehicle." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6704.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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9

Behr, Thomas. "Control of rotor tip leakage and secondary flow by casing air injection in unshrouded axial turbines /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17283.

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10

Gagnon, Robert. "Sub-Miniature Pressure Sensor Installation for UH-60A Main Rotor Blade Air Loads Flight Test Program." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614625.

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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California<br>A UH-60A (Black Hawk) full-scale main rotor blade has been instrumented with 242 subminiature pressure transducers placed beneath the blade skin. The instrumented blade will be flight tested on a UH-60A helicopter at the AMES Research Center. The pressure transducers are of the sub-miniature silicon full-bridge type with a small diameter tube (.028 inches OD) leading into the pressure sensing cavity. Fifty of the transducers have built-in tempera
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11

Riley, Troy M. "Aeroacoustics and Fluid Dynamics Investigation of Open and Ducted Rotors." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627667464605408.

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12

Bole, Michael. "Design of an automatic landing system for twin rotor vertical take-off and landing unmanned air vehicle." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ47834.pdf.

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13

Thompson, Swen. "Analysis of the Dynamic Interferences Between the Stator and Rotor of a Refrigeration Compressor Motor." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/30364.

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This thesis involves the development and study of a finite element model of a hermetic, single-vane compressor and a single-phase alternating current induction motor assembled in a common housing. The manufacturer of this unit is experiencing a high scrap rate due to interference during operation between the stator and rotor of the motor. The rotor shaft of the motor is non-typical because of its cantilever design. The finite element model was first subjected to eigenvalue analysis. This revealed that the interference producing displacements were not the result of torque application to the
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14

Grudziecki, Jan. "CFD INVESTIGATION OF THE PURGE AIR INFLUENCE ON THE FLOW STRUCTURE AND BEHAVIOUR OF GAS TURBINE STAGE AND ROTOR-STATOR DISC CAVITY SYSTEM." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174334.

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Gas turbines operate with medium of very high temperatures, which requires using advanced materials for vanes and blades and sophisticated methods of their cooling. Other parts of the turbine have to be protected from contact with hot gases. Discs that hold vanes and blades are especially exposed to this danger. In order to avoid it certain improvements have to be applied: providing sealing air and adjusting geometry of the hub to make the ingress to the cavity (space between discs)more difficult. This thesis concerns CFD investigation of the influence of the amount of sealing air on sealing e
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15

Randewijk, Peter-Jan. "Analysis of a radial flux-air-cored permanent magnet machine with a double-sided rotor and non overlapping windings." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20246.

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Thesis (PhD)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: In this dissertation a new type of electrical machine, a Radial Flux Air-Cored Permanent Magnet machine with a Double-sided Rotor and utilising concentrated, non-overlapping windings, is proposed. The concept of the Double-sided Rotor Radial Flux Air-Cored Permanent Magnet machine, or RFAPM machine for short, was derived from the Double-sided Rotor Axial Flux Air-Cored Permanent Magnet (AFAPM) machine. One of the problems that AFAPM machines experience, is the deflection of the rotor discs due to the strong magnetic pull o
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16

Barzem, Lamyaa. "Analyse théorique et experimentale de la dynamique de rotor sur paliers à feuilles lubrifié par l'air." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00918876.

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Ces dernières décennies de nombreux modèles de paliers à feuilles ont été développés. Aujourd'hui, la limite de ces modèles est apparente notamment au niveau de la compréhension des comportements non linéaire du système rotor palier et de la quantification de sa dissipation énergétique. Il est essentiel pour les développements futurs de maîtriser les instabilités liées au fonctionnement de ces paliers. Grâce à une approche variationnelle et la MEF, la structure flexible a été modélisée comme une structure mince soumise à la pression d'un fluide compressible, isotherme, laminaire puis turbulent
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17

Havlát, Pavel. "Konstrukční studie sinusového čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229699.

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This dissertation focuses on the construction design of a sine pump. It particularly deals with loss minimisation and strives to solve problems relating to excessive wear of the scrapergate which separates suction and the delivery space. The first part of the dissertation describes a new construction variation of a sine pump and the second part deals with a more detailed study including optimisation of one variation.
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18

Наний, Виталий Викторович. "Угол нагрузки двигателей с катящимся ротором". Thesis, Техническият университет – Габрово, 2012. http://repository.kpi.kharkov.ua/handle/KhPI-Press/24436.

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В статье приводиться методика определения реального угла нагрузки двигателя с катящимся ротором с помощью компьютерного моделирования магнитного поля двигателя. Дано сравнение 8- и 6-пазовой конструкции двигателя с катящимся ротором с учетом неравномерности его воздушного зазора и анализируется влияние этого зазора на реальный угол нагрузки машины. Приводятся результаты полученных исследований в графическом виде и сравниваются максимальные значения полученных углов для 6- и 8-пазовой модели двигателя.<br>The article presents a comparison 8 - and 6-slot design of motor with a rolling rotor (MRR
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19

D'Haudt, Emmanuel Bois Gérard Debuchy Roger. "Étude expérimentale de l'influence des conditions périphériques sur un écoulement turbulent de type rotor-stator premières confrontations avec des résultats de simulations numériques /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/988.

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Reproduction de : Thèse de doctorat : Mécanique : Lille 1 : 2006.<br>N° d'ordre (Lille 1) :3874. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 171-173.
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20

D'Haudt, Emmanuel. "Étude expérimentale de l'influence des conditions périphériques sur un écoulement turbulent de type rotor-stator : premières confrontations avec des résultats de simulations numériques." Lille 1, 2006. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2006/50376-2006-D_Haudt.pdf.

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Les recherches effectuées sur des écoulements turbulents dans des cavités interdisques ont permis de mettre en évidence l'importance des conditions aux limites. Ce présent travail a pour but de mieux comprendre les phénomènes qui régissent l'apparition de différents types d'écoulements observés dans une cavité rotor-stator non soumise à un flux radial forcé. Dans cette optique, un banc d'essais a été adapté pour étudier plus spécifiquement l'influence de deux paramètres géométriques, l'un lié à une faible différence entre le rayon des disques, l'autre relatif à la présence d'un carter permetta
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21

Chlup, Jaroslav. "Model proudění chladicího média v synchronním stroji." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218581.

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This project deals with simulation´s possibilities of air flow in electric machines. A finite element method is the final element technique. Aim of this project is conversion universal formula for calculation friction dissipation factor. For its location is necessary to create 27 simulations according to the 2. plan order. Usage programme MATLAB for processing results obtain requisite algorithm for calculation friction dissipation factor.
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22

Pinto, Bruno Eduardo Carvalho. "“Stripping” ortodôntico/desgaste interproximal do esmalte: obtenção de espaço no tratamento ortodôntico." Master's thesis, [s.n.], 2015. http://hdl.handle.net/10284/4833.

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Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária<br>O desgaste interproximal do esmalte é também conhecido como stripping ortodôntico, redução do esmalte, desgaste seletivo ou reaproximação dentária. Sendo uma técnica introduzida na ortodontia em 1940, consiste num método auxiliar ortodôntico que tem como finalidade a obtenção de espaço para o alinhamento dentário. Este procedimento é realizado através do desgaste seletivo do esmalte dentário, diminuindo desta forma as dimensões m
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23

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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24

Svetlík, Martin. "Dynamický model synchronního stroje s využitím magnetických ekvivalentních obvodů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219176.

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The thesis focuses on constructing dynamic model - synchronous generator with using magnetic equivalent circuit diagrams. The model construction is based on knowledge of geometric parameters, magnetic characteristic of used material and fyzical deployment of vindings placed in stator slots. Computed reults are compared with results optained from model created with finite element method.
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25

Bradley, William John. "Current based fault detection and diagnosis of induction motors : adaptive mixed-residual approach for fault detection and diagnosis of rotor, stator, bearing and air-gap faults in induction motors using a fuzzy logic classifier with voltage and current measurement only." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7265.

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Induction motors (IM) find widespread use in modern industry and for this reason they have been subject to a significant amount of research interest in recent times. One particular aspect of this research is the fault detection and diagnosis (FDD) of induction motors for use in a condition based maintenance (CBM) strategy; by effectively tracking the condition of the motor, maintenance action need only be carried out when necessary. This type of maintenance strategy minimises maintenance costs and unplanned downtime. The benefits of an effective FDD for IM is clear and there have been numerous
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Bradley, William J. "Current Based Fault Detection and Diagnosis of Induction Motors. Adaptive Mixed-Residual Approach for Fault Detection and Diagnosis of Rotor, Stator, Bearing and Air-Gap Faults in Induction Motors Using a Fuzzy Logic Classifier with Voltage and Current Measurement only." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7265.

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Induction motors (IM) find widespread use in modern industry and for this reason they have been subject to a significant amount of research interest in recent times. One particular aspect of this research is the fault detection and diagnosis (FDD) of induction motors for use in a condition based maintenance (CBM) strategy; by effectively tracking the condition of the motor, maintenance action need only be carried out when necessary. This type of maintenance strategy minimises maintenance costs and unplanned downtime. The benefits of an effective FDD for IM is clear and there have been numerous
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27

Voyant, Jean-Yves. "Calcul des performances d'une machine synchrone à poles saillants." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0195.

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Ce travail concerne les machines synchrones à excitation (rotor bobiné). Leur modélisation est effectuée sous forme analytique; elle peut être employée lors des phases d'étude et de conception de ces machines (par exemple, pour la prédétermination des formes d'ondes et des pertes fer). Le premier chapitre présente les véhicules électriques et les particularités de leur chaîne de traction. Nous en déduisons ensuite les contraintes qui influent sur les paramètres magnétiques de ces machines. La méthode de calcul utilisée est détaillée dans le deuxième chapitre. Celle-ci permet d'analyser les eff
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28

Klimas, Janas. "Sinchroninio mikrovariklio tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040610_193149-46817.

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The object of the final work is the magnetic field of the synchronous salient-pole reluctance micro motor and distribution of it in the air gap. The analysis of the magnetic field distribution have been made with three rotor variants: an isosceles rotor, a rotor with an arched slot of, a rotor with a rectangular slot, using a specialized field counting program - “QuickField” 4.2 Beta 1 student version. In the study, the influence of the rotor slot and the constructional air spacing to the distribution of the magnetic flux density in the air gap when the angular position of the rotor alternates
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29

Formánek, Jakub. "Vliv excentricity na radiální síly v asynchronním motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221182.

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The aim of this master thesis is to get familiar with the influence of radial forces in the induction machine. Induction motor is one of the most commonly used and most extended type of machine, therefore it is useful to detect the intensity of theese forces and their influence at operation of the machine. In this work ,radial forces are computed by the software simulation in ANSYS Maxwell. Models are created with help of module Rmxprt and finite elements method.These models are based on real induction motors with predefined size of eccentricity. In the final part we perform a measurement of d
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30

Ezenekwe, Dan Emeka. "Design methodology of an air bearing system for multi-DOF spherical actuator motion control applications." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17861.

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31

Jaohindy, Placide. "Modélisation des systèmes éoliens verticaux intégrés aux bâtiments : modélisation du couple production / Bâtiment." Thesis, La Réunion, 2012. http://www.theses.fr/2012LARE0005/document.

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La technique d'intégration des systèmes éoliens verticaux (VAWT) au service des logements individuels, collectifs et tertiaires est une approche intéressante pour les acteurs de la maitrise d'énergie pour promouvoir une utilisation rationnelle de l'énergie. Le choix de l'implantation d'une éolienne en milieu urbain est déterminé par la hauteur des bâtiments, la vitesse du vent et l'intensité de turbulence du site. Les conditions de vents sévères à faible altitude sont favorables à une implantation de VAWT. Dans certaines villes, la hauteur moyenne des bâtiments est relativement faible et ceci
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32

Castex, André. "Etude de l'interaction 2D entre un profil d'aile et un sillage tourbillonnaire généré par le décrochage dynamique d'un profil d'aile." Aix-Marseille 2, 1986. http://www.theses.fr/1986AIX22035.

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Essai en soufflerie d'une configuration bidimensionnelle constituee de deux profils d'aile dont l'un est anime en amont d'une oscillation de tamis dans des conditions de decrochage dynamique et l'autre immobile est place en differentes positions du sillage tourbillonnaire emis par le premier profil. Mise en evidence de variations simultanees de vitesse et d'incidence. Modelisation des effets non-lineaires observes
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Adamčík, Martin. "Limit Modes of Particulate Materials Classifiers." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-367539.

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S požadavky materiálových věd na stále menší částice jsou potřebné i nové přístupy a metody jejich klasifikace. V disertační práci jsou zkoumány struktury turbulentního proudění a trajektorie částic uvnitř dynamického větrného třídiče. Zvyšující se výpočtový výkon a nové modely turbulence a přístupy modelování komplexních plně turbulentních problémů řešením Navier-Stokesových rovnic umožňují zkoumání stále menších lokálních proudových struktur a vlastností proudění s větší přesností. Částice menší než 10 mikronů jsou více ovlivnitelné a jejich klasifikace do hrubé nebo jemné frakce závisí na m
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Pereira, Jason L. "Hover and wind-tunnel testing of shrouded rotors for improved micro air vehicle design." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8752.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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35

Власюк, Я. М. "Вдосконалення засобів і нормативної документації для метрологічного забезпечення вузлів обліку природного газу". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2012. http://elar.nung.edu.ua/handle/123456789/1784.

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Дисертація присвячена вирішенню актуальної задачі підвищення точності і надійності роботи турбінних, ультразвукових і роторних лічильників газу, а також промислових вузлів обліку газу, на яких передбачено використання цих лічильників газу. З використанням СїїО технології теоретично досліджені динамічні метрологічні характеристики турбінних лічильників газу. Показано, що ці лічильники в перехідних режимах (різкі зміни витрати вимірюваного газу) мають значні додаткові похибки. Обґрунтована можливість визначення густини газу за допомогою послідовно з’єднаних між собою сопла Вентурі і об’ємного
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Rudloff, Laurent. "Etudes expérimentales de paliers aérostatiques hybrides et des paliers aérodynamiques à feuilles." Poitiers, 2011. http://theses.univ-poitiers.fr/22002/2011-Rudloff-Laurent-These.pdf.

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Le travail présenté dans cette thèse est effectué sur deux bancs d'essais différents. Avec le premier banc d'essais, les caractéristiques dynamiques d'un palier aérostatique à air sont étudiées expérimentalement pour une configuration en rotor rigide. Le rotor est entraîné en rotation à 60 krpm par une turbine Pelton et monté horizontalement sur deux paliers aérostatiques identiques alimentés en air jusqu'à des pressions de 11 bar. La charge dynamique est appliquée soit par l'impact d'un marteau, soit par un balourd additionnel. Le banc d'essais permet la mesure de la pression et du débit d'al
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37

Lu, Bin. "Energy Usage Evaluation and Condition Monitoring for Electric Machines using Wireless Sensor Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14152.

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Energy usage evaluation and condition monitoring for electric machines are important in industry for overall energy savings. Traditionally these functions are realized only for large motors in wired systems formed by communication cables and various types of sensors. The unique characteristics of the wireless sensor networks (WSN) make them the ideal wireless structure for low-cost energy management in industrial plants. This work focuses on developing nonintrusive motor-efficiency-estimation methods, which are essential in the wireless motor-energy-management systems in a WSN architecture t
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Modha, Ajay Narendra. "A fundamental study into main rotor design with the aim of improving the conventional helicopter's stability and control properties." Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/47093/.

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Silva, Márcio Gomes da. "Estudo experimental de um sistema de condicionamento de ar com rotores dessecantes." Universidade Federal da Paraí­ba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/5412.

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Made available in DSpace on 2015-05-08T15:00:06Z (GMT). No. of bitstreams: 1 parte1.pdf: 1140814 bytes, checksum: 542f51d418daba0191fb72d0eefa3504 (MD5) Previous issue date: 2010-11-12<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This work is presented in an air conditioning system using evaporative cooling coupled with desiccant rotor, which presents itself as an alternative to refrigeration system for vapor compression. In this sense, was mounted on the Solar Energy Laboratory UFPB in Joao Pessoa, an industrial-scale prototype of a desiccant cooling system
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Groenewald, David Jordaan. "Evaluation of a radial flux air-cored permanent magnet machine drive with manual transmission drivetrain for electric vehicles." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6576.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.<br>Due to finite oil resources and its political and economical impact, a renewed interest in energy independence has compelled industry and government to pursue electric vehicle designs. The current worldwide research that is being conducted on drivetrain topologies for EVs, focus mainly on direct in-wheel drive, direct differential drive and fixed-gear differential drive topologies. Furthermore, the control strategy for these type of motor drives require a, so called, field-weakening operation in
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Azzam, Tarik. "Aérodynamique et contrôle de l'écoulement de jeu dans un ventilateur axial obtenu par rotomoulage." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0080/document.

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Aujourd’hui, la fabrication des turbomachines est conditionnée par des normes de plus en plus restrictives. L'enjeu industriel pour les chercheurs est d'envisager des solutions optimales visant à réduire les sources de perte d'énergie, d'instabilité et du bruit, en particulier l'écoulement de jeu (débit de fuite). Des actions préliminaires ont été élaborées à Arts &amp; Métiers ParisTech sur le rotomoulage du ventilateur axial de refroidissement d'automobile. L'idée de ce travail est d'utiliser la forme creuse induite par le rotomoulage afin de l'exploiter dans le controle de l'écoulement de j
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Chauffaut, Corentin. "Etude de la phase de transition d'un drone tiré par tube dédié : modélisation et commande." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP2154/document.

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La motivation qui a initié le projet de recherche ANR « Démonstrateur Gun Launched Micro Air Vehicle » est le besoin d’avoir un engin portatif qui permettrait d’obtenir rapidement des images d’une zone d’intérêt située à quelques centaines de mètres, avec la possibilité de pouvoir observer l’intérieur des bâtiments à travers leurs fenêtres ou en allant les explorer directement. Pour répondre à ce besoin, l’Institut franco-allemand de recherche de St Louis a eu l’idée de lancer un minidrone hélicoptère avec un canon. Le GLMAV, sous la forme d’un projectile, est lancé à partir d‘un tube portable
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43

Hart, Peter Bartholomew. "A plm implementation for aerospace systems engineering-conceptual rotorcraft design." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28278.

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The thesis will discuss the Systems Engineering phase of an original Conceptual Design Engineering Methodology for Aerospace Engineering-Vehicle Synthesis. This iterative phase is shown to benefit from digitization of Integrated Product&Process Design (IPPD) activities, through the application of Product Lifecycle Management (PLM) technologies. Requirements analysis through the use of Quality Function Deployment (QFD) and 7 MaP tools is explored as an illustration. A "Requirements Data Manager" (RDM) is used to show the ability to reduce the time and cost to design for both new and legacy/deri
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CHEN, YI-CHENG, and 陳俋丞. "Swing rotor air motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/42511700070642388234.

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碩士<br>中華科技大學<br>機電光工程研究所碩士班<br>103<br>A new air motor is fabricated in this thesis by utilizing the mechanism of a novel compressor in modern air-condition appliances. The swing-type rotary piston provides extraordinary benefits of less friction, less number of parts and more endurance of product. By following the concept of the compressor, we redesign the inlet and outlet vents in 90 degree span angle to accommodate four stages of expanding cylinders. The thickness of each cylinder is thickened 1.4 times larger than its previous one as to recover the same force in every cylinder for the press
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袁興磊. "Air Turbine Rotor Design and CFD Simulation Analysis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/09856598650408847545.

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Lu, Ying-Yen, and 盧穎彥. "Rotor Design and Testing of a Micro Air Turbine Generator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/19193122964456449050.

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碩士<br>國立清華大學<br>動力機械工程學系<br>101<br>Pressure expansion is required in many process applications, and the excess process energy ends up being dissipated as heat. An Example is the throttling process of compressed air systems. Using a micro air turbine generator that can produce electricity under pressure expansion, the wasted energy can be recovered. This paper proposes a millimeter-scale air turbine which can be used for electric generation. The air turbine is based on a single-stage axial reaction turbine with a rated rotational speed of 100,000 RPM and a rated mechanical power output of 150 W
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47

Singh, Rahul. "Analysis and Parametric Identification of Air Foil Bearing Rotor System." Thesis, 2016. http://ethesis.nitrkl.ac.in/8194/1/2016_MT_214ME1304_Analysis_and_Parametrics.pdf.

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With the increasing demand for high speed turbomachinery, the dynamic analysis of rotor bearing system has become very important. Foil bearings with their exceptional feature of negligible wear has gained a very important place in the field of turbomachinery but the nonlinearities present in the bearing call for the dynamic analysis of these bearings. In the present work, a dynamic modeling approach and parametric identification scheme of a single disc rotor mounted on foil bearings is presented. Rotor is analyzed with conventional lumped parameter model. The time varying bearing forces are ob
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Chen, Ming. "Formation and flight control of affordable quad-rotor unmanned air vehicles." Thesis, 2003. http://hdl.handle.net/2429/14459.

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For several decades, Unmanned Air Vehicles (UAVs) have generated considerable interest in the control and commercial community due to their advantages over manned systems. Cutting edge techniques in senors, communications and robust control can now make affordable commercial missions involving Unmanned Air Vehicles (UAVs) a reality. The aim of this work was to control an autonomous UAV using H[sub ∞] loop shaping and MPC control laws and further demonstrate formation control with three such identical UAVs. The UAV used in our project is the four-rotor Dragonflyer III helicopter. To achieve the
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ZHI-ZHE, XU, and 許智哲. "A Study of New-developed Rotor Engine Air Seal Components Manufactured Processing." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/srgmtx.

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碩士<br>國立勤益科技大學<br>機械工程系<br>106<br>The processing technology of gas seal of high-performance military aircraft-grade rotary engine is normally the secret technology of engine manufacturer. It is not easy to know Grey cast iron alloy recipe and professional processing process. For industry-rotor engine air seal parts processing, they will first grind the alloy casting to a desired processing dimension, and then sent into Wire Electrical Discharge Machining processing plant to cut out the outline of the desired size. This method has a disadvantage of the high cost and the time consuming, alloy ca
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Tsai, Te-Hui, and 蔡德輝. "The Volume Effect of Air Recess in Stability of Rotor-aerostatic Bearing System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77339412211427293660.

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博士<br>中原大學<br>機械工程研究所<br>99<br>Abstract This paper studies static and dynamic characteristics of a rigid spindle supported by aerostatic bearings. The air passes through the double-row hole entries, which consist of orifices restrictors, into the bearing clearance. The process is adiabatic. The air film in this bearing clearance is governed by Reynolds equation, coupling both wedge effect due to spindle rotation and squeezed effect due to journal oscillation. The -method is used to analyze Reynolds equation, solved by the finite difference method and numerical integration, and then yields
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