Tesi sul tema "Helicopter"
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Perkins, Keith M. "Implementing realistic helicopter physics in 3D game environments". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FPerkins.pdf.
Testo completoThesis advisor(s). Includes bibliographical references (p. 79-80). Also available online.
Peitso, Loren E. "Visual field requirements for precision nap-of-the-earth helicopter flight". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FPeitso.pdf.
Testo completoThesis advisor(s): Rudolph P. Darken, Joe Sullivan. Includes bibliographical references (p. 65-66). Also available online.
Kulakowski, Walter W. "Exploring the feasibility of the virtual environment helicopter system (VEHELO) for use as an instructional tool for military helicopter pilots". Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1394.
Testo completoUS Marine Corps (USMC) author.
Howard, Christopher B. Bradley Walter Lee. "Fatigue methodology for analysis of helicopter dynamic components". Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5188.
Testo completoCarico, Dean. "Helicopter controllability". Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27077.
Testo completoOlsson, Julia, e Sophie Nilsonne. "Helicopter money". Thesis, KTH, Fastigheter och byggande, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191551.
Testo completoDenna uppsats har genom en kvalitativ undersökning redogjort för begreppet helikopterpengar samt vilka förutsättningar som krävs för att implementera det i Sverige med hänsyn till rådande lagstiftning. Helikopterpengar bygger på en teori av Milton Friedman och innebär en permanent ökning av penningmängden via en transferering till hushållen vilket resulterar i en ökad aggregerad efterfråga och stigande inflation. Begreppet har utvecklats av bland annat Ben Bernanke som menar på att en transferering av helikopterpengarna likväl kan ske till staten för att öka offentliga utgifter och på det sättet driva upp inflationen. Helikopterpengar är en typ av direkt monetär finansiering som är förbjuden i Sverige med dagens lagstiftning. Det går dock att praktiskt tillämpa helikopterpengar genom att göra en indirekt transferering till staten genom köp av statsobligationer som hålls för evigt. Helikopterpengar kräver alltså ett samarbete mellan staten och Riksbanken. För att helikopterpengar ska få önskad effekt bygger det på att pengarna konsumeras. Helikopterpengar innebär en asymmetrisk behandling av pengarna vilket gör att hushållen inte behöver betala tillbaka pengarna i framtiden och konsumtionsbenägenheten ökar. Helikopterpengar urholkar kronans värde vilket leder till en svagare valuta som i sin tur också bidrar till en ökad inflation. En transferering till hushållen skulle med stor sannolikhet ge effekt på inflationsnivån men medför även risker. Genomförs däremot en transferering till staten kommer inflationen med säkerhet att öka då staten kan se till att varje krona spenderas. Bästa sättet att implementera helikopterpengar för att få störst effekt med hänsyn till rådande lagstiftning är alltså att göra en indirekt transferering till staten. Det är även viktigt att kommunicera intentionerna på ett pedagogiskt sätt för att marknaden ska behålla förtroendet för pengar och institutionerna.
Ference, Edward W. "Case study of the development of the Apache attack helicopter (AH-64)". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FFerence.pdf.
Testo completoThesis advisor(s): Michael W. Boudreau, Richard G. Rhoades. Includes bibliographical references (p. 63-65). Also available online.
Zhao, Jinggen. "Dynamic Wake Distortion Model for Helicopter Maneuvering Flight". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7103.
Testo completoLaw, N. "Integrated helicopter survivability". Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6518.
Testo completoSadownick, Ronald 1960. "Helicopter configuration optimization". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/82683.
Testo completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaf 102).
by Ronald Sadownick.
S.M.
Morgans, Aimee Sian. "Transonic helicopter noise". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615704.
Testo completoLeusink, Debbie. "Advanced numerical tools for aerodynamic optimization of helicopter rotor blades". Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0010.
Testo completoThe aerodynamic design of helicopter rotor blades requires taking into accountedmultiple objectives simultaneously, to provide a compromise solution for the conflictingrequirements associated to hover and forward flight conditions. The present work aims atdeveloping an automated optimization based on the combination of advanced optimizationalgorithms and simulation tools. As a preliminary step, candidate simulation methods andoptimization algorithms are assessed in detail. Two simulation methods are employed for thecomputation of rotor performance: the in-house Helicopter Overall Simulation Tool (HOST),based on the blade element method, and ONERA’s Computation Fluid Dynamics (CFD) codeelsA. An in-detail analysis of both simulation tools for well documented test cases is carried out,with focus on their capability of predicting trends of the global rotor performance as a function ofblade geometry. The impact of computation settings is also characterized. Then, an optimizationstrategy is developed, allowing the incorporation of multiple objectives and complex constraints,and the detection of global optima for multi-modal problems. Based on these criteria, a geneticalgorithm (GA) is selected. To reduce the number of simulations required to find optimalsolutions, a Multi-Fidelity Optimization (MFO) strategy is proposed: a preliminary low-fidelity GAoptimization stage based on HOST simulations is used to reduce the design space by selectinga high-performance subspace. Then, a CFD-based surrogate model is constructed on thereduced design space by using a sample of high-performance blade from the low-fidelity step.The final optimization step is run on the high-fidelity surrogate. The proposed MFO approachresults in significant rotor performance improvements while using a far lower number of costlyCFD evaluations of the objective functions with respect to a full GA optimization. The proposedapproach is shown to represent an efficient design tool for industrial helicopter rotor blade
Bru, Leif Hamang. "Autonomous Remote Controlled Helicopter". Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9199.
Testo completoUnmanned Aerial Vehicles (UAVs) have a tremendous appeal. One can imagine a large number of applications such as search-and-rescue, traffic monitoring, aerial mapping, etc. Helicopters are particularly attractive due to their Vertical Take Off and Landing (VTOL) capabilities. The research on UAVs has shown rapid development in recent years, and offers a great number of challenges. This thesis is the result of a project which is a part of the Autonomous Remote Controlled Helicopter (ARCH) project at the Department of Computer and Information Science, Norwegian University of Science and Technology. The ARCH project has already gained public interest, when it was featured on a television program (Schrödingers katt, NRK. September 2004). The object of this thesis is divided into three main sections. Firstly, it is to create and describe a remote control system for controlling the UAV in semi-autonomous mode, that will also enable the UAV to autonomously follow objects (pursuit-mode). Secondly, it is to create and describe a virtual cockpit which is to be used with the remote control system. Finally, it is to create and describe an image stabilization system, which can stabilize the visual information sent from the UAV to the ground and the virtual cockpit. These three components have been combined and integrated into the client prototype called ARCH Groundstation. Together, these three components provides a platform for an operator to control the ARCH UAV in semi-autonomous mode.
Kenyon, Adam Richard. "Helicopter Rotor- Fuselage Aerodynamic Interactions". Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499021.
Testo completoPrince, Martyn Paul. "Stabilising ships for helicopter operations". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342777.
Testo completoAdamson, Alan, e Albert Berdugo. "Helicopter Slip Ring Replacement System". International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604271.
Testo completoMost helicopter programs require the acquisition of parameters from the rotating systems. Historically, these systems made use of electromechanical slip rings for the transfer of power, control, and data from within the helicopter's cabin to the rotating hardware. Slip rings are primarily used in dedicated instrumentation vehicles and are not commonly used in production platforms that may require instrumentation of the rotating systems for in-service load and fatigue monitoring. Additionally, the use of slip rings requires time and money to integrate the hardware and equipment into the aircraft in order to perform rotor data acquisition. The time needed to perform modifications to transmissions and drive trains plays a big factor in the increased costs of aircraft development. Less intrusive installations would minimize the need for mechanical changes and would improve the time needed to install the instrumentation. This paper describes a wireless system approach to perform the test without the slip ring, and provides performance data that validates this new method of instrumenting unobtrusively to save time and money without sacrificing data integrity.
Elias, Joerg. "Advanced integrated helicopter flight simulator cockpit design". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/12469.
Testo completoKadmiry, Bourhane. "Fuzzy Control for an Unmanned Helicopter". Licentiate thesis, Linköping University, Linköping University, AUTTEK - Autonomous Unmanned Aerial Vehicle Research Group, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5723.
Testo completoThe overall objective of the Wallenberg Laboratory for Information Technology and Autonomous Systems (WITAS) at Linköping University is the development of an intelligent command and control system, containing vision sensors, which supports the operation of a unmanned air vehicle (UAV) in both semi- and full-autonomy modes. One of the UAV platforms of choice is the APID-MK3 unmanned helicopter, by Scandicraft Systems AB. The intended operational environment is over widely varying geographical terrain with traffic networks and vehicle interaction of variable complexity, speed, and density.
The present version of APID-MK3 is capable of autonomous take-off, landing, and hovering as well as of autonomously executing pre-defined, point-to-point flight where the latter is executed at low-speed. This is enough for performing missions like site mapping and surveillance, and communications, but for the above mentioned operational environment higher speeds are desired. In this context, the goal of this thesis is to explore the possibilities for achieving stable ‘‘aggressive’’ manoeuvrability at high-speeds, and test a variety of control solutions in the APID-MK3 simulation environment.
The objective of achieving ‘‘aggressive’’ manoeuvrability concerns the design of attitude/velocity/position controllers which act on much larger ranges of the body attitude angles, by utilizing the full range of the rotor attitude angles. In this context, a flight controller should achieve tracking of curvilinear trajectories at relatively high speeds in a robust, w.r.t. external disturbances, manner. Take-off and landing are not considered here since APIDMK3 has already have dedicated control modules that realize these flight modes.
With this goal in mind, we present the design of two different types of flight controllers: a fuzzy controller and a gradient descent method based controller. Common to both are model based design, the use of nonlinear control approaches, and an inner- and outer-loop control scheme. The performance of these controllers is tested in simulation using the nonlinear model of APID-MK3.
Report code: LiU-Tek-Lic-2002:11. The format of the electronic version of this thesis differs slightly from the printed one: this is due mainly to font compatibility. The figures and body of the thesis are remaining unchanged.
Trentini, Michael. "Mixed norm control of a helicopter". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0034/NQ38512.pdf.
Testo completoSeggerty, Ryan L. "MUOS: application in naval helicopter operations". Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45255.
Testo completoThe Mobile User Objective System (MUOS) is the next generation of military satellite communications technology. Using a unique combination of satellite vehicles and radio access facilities, MUOS allows the end user unparalleled access to the global information grid (GIG) with a significant increase in voice and data capacity over legacy UFO systems. Leveraging current WCDMA technology used by commercial cellular companies, the MUOS system will allow uninterrupted communications worldwide. This research aims to identify gaps in existing naval helicopter network capabilities and how to apply MUOS to further increase operational effectiveness. Current and legacy helicopter platforms were analyzed regarding connectivity in a network centric environment. Using simple modeling techniques in order to reduce the throughput of the user terminal to 16 kbps enabled a simulation of load times of various Internet applications. Analyzing the load times of web applications gives an initial indication of the viability of MUOS in the rotary wing environment. Even when reduced to a throughput of 16 kbps, many of the applications would still be usable in benign flight regimes. Text- or chat-based applications will see the biggest benefit from MUOS technology, allowing aircrews to quickly disseminate information anywhere in the world.
Ling, Gustav, e Jesper Persson. "Propulsion Unit of a 3DOF Helicopter". Thesis, Linköpings universitet, Fluida och mekatroniska system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120799.
Testo completoDesign & Implementation of a 3DOF Helicopter
Hay, Melissa Constance. "Noise Exposure in Medical Helicopter Flights". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4331.
Testo completoFarhat, M. A. "Engineering a miniature remotely piloted helicopter". Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372718.
Testo completoLawes, Stephen Thomas. "Real-time helicopter modelling using transputers". Thesis, University of York, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241015.
Testo completoKeener, Joseph Kristopher 1975. "The helicopter innovation in Army aviation". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8777.
Testo completoIncludes bibliographical references (p. 79-82).
This study was performed to test competing theories of innovation for their explanatory power in describing the series of innovations in United States Army aviation centered on the helicopter. The theories of strategic threat, civilian intervention, and inter service rivalry were applied to the innovations of air mobility, the anti-tank helicopter, and recent developments in Army doctrinal thought. This study found that while strategic threat and inter-service rivalry theories provided adequate explanation for the developmental phases of the innovation, only civilian intervention could fully explain the implementation of these innovations into Army force structure.
by Joseph Kristopher Keener.
Ph.D.
Spangler, Ronald L. 1964. "Piezoelectric actuators for helicopter rotor control". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14462.
Testo completoEren, Perk Barıṣ. "Control primitives for fast helicopter maneuvers". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38283.
Testo completoIncludes bibliographical references (leaves 77-82).
In this paper, we introduce a framework for learning aggressive maneuvers using dynamic movement primitives (DMP) for helicopters. Our ultimate goal is to combine these DMPs to generate new primitives and demonstrate them on a 3-DOF (3 Degrees of Freedom) helicopter. An observed movement is approximated and regenerated using DMP methods. After learning the movement primitives, the partial contraction theory is used to combine them. We imitate the aggressive maneuvers that are performed by a human and use these primitives to achieve new maneuvers that can fly over an obstacle. Experiments on the Quanser 3-DOF Helicopter demonstrate the effectiveness of our proposed method. In addition, we linearly combine DMPs and propose a new type of DMP. We also analyze Matsuoka's oscillator and Hopf oscillator using contraction theory.
by Barıṣ Eren Perk.
S.M.
Daigh, Sara L. (Sarah Louise) 1981. "Helicopter final assembly critical path analysis". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73413.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 53).
Helicopter final assembly involves the installation of hundreds of components into the aircraft and takes thousands of man-hours. Meeting production targets such as total build days and total aircraft man-hours can be difficult when faced with challenges related to parts, workforce, and scheduling. A tool to identify key installations on which to focus efforts for maximum benefit can help improve performance to targets. The Critical Path Method was developed as a project management tool to aid in scheduling large and complex projects. Its application to manufacturing can provide the insights necessary to improve performance in an environment such as helicopter final assembly. This thesis provides a case study of helicopter final assembly. A critical path analysis is performed on the assembly process, using predecessor, duration, and resource data. The results of the analysis are used to draw conclusions about the system as a whole and to make recommendations to improve system performance.
by Sarah L. Daigh.
S.M.
M.B.A.
Trott, Christian A. (Christian Alan). "Electronics design for an autonomous helicopter". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43573.
Testo completoIncludes bibliographical references (p. 158).
by Christian A. Trott.
M.Eng.
Orchard, Matthew Noel. "Optimisation of the compound helicopter configuration". Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/47096/.
Testo completoPomfret, Andrew James. "Eigenstructure assignment for helicopter flight control". Thesis, University of York, 2006. http://etheses.whiterose.ac.uk/21053/.
Testo completoBuysschaert, Frank. "Helicopter power transmission : changing the paradigm". Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386149/.
Testo completoHorcher, Andy. "Improving Helicopter Yarding with Onboard GPS". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26678.
Testo completoPh. D.
Oktay, Tugrul. "Constrained Control of Complex Helicopter Models". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26619.
Testo completoPh. D.
Arlinghaus, Mark C. "Autopilot Development for an RC Helicopter". Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1259002743.
Testo completoMannchen, Thomas. "Helicopter vibration reduction using robust control". [S.l. : s.n.], 2003.
Cerca il testo completoShropshire, David Richard 1950. "Feasibility of a helicopter commuter service". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277179.
Testo completoTafoya, Keirsten Breann. "Process Improvement of Surface Preparation of Structuraly Bonded Helicopter Detail Parts". Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404599/.
Testo completoBodin, Erik, e Fanny Stenholm. "Modelling & Control of a 3DOF Helicopter". Thesis, Linköpings universitet, Fluida och mekatroniska system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119614.
Testo completoBarron, James Richard. "Improving finite element methods for fabricated structures". Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/8022.
Testo completoWright, George T. "Helicopter Urban Navigation Training using virtual environments". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA379671.
Testo completoErcin, Gulsum Hilal. "Flight Simulation And Control Of A Helicopter". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12610194/index.pdf.
Testo completoIngvaldsen, Ola Naalsund. "Power Efficient Video Communication for Mini Helicopter". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11458.
Testo completoClark, Gary A. "Helicopter handling qualities in degraded visual environments". Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486093.
Testo completoHaycock, Bruce Charles. "Development of a helicopter emergency maneuvers trainer". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62891.pdf.
Testo completoHansén, Rasmus, Axel Ringh, Victoria Svedberg e Nils Landin. "Autonomus Helicopter Landing on a Mobile Platform". Thesis, KTH, Optimeringslära och systemteori, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105551.
Testo completoDen här uppsatsen undersöker problemet att autonomt landa en modellhelikopter på en mobil plattform genom att använda olika regulatorer för attityd- och translationsdynamiken. Den matematiska beskrivningen av helikoptern utgår från dynamiken för en stel kropp med 6 frihetsgrader. Eftersom landning kan genomföras med låga hastigheter och små vinklar används en linjär modell för att göra problemet mer lätthanterligt. Insignalerna till systemet är kraften från stjärtrotorn och lutningsvinklarna av huvudrotorns Tip-Path-Plane. En kaskadregulator används för att styra translationssystemet med eulervinklarna och kraften från huvudrotorn, som insignaler. Regulatorn testas i en MATLAB-simulering mot en glatt referensbana med godkända resultat. För landingsproceduren används en banplaneringsstrategi som bygger på linjär prediktiv reglering (PR). Kaskadregulatorn används sedan för att följa translationsreferenserna, vilka blir valda så att även attitydsystemet anpassas efter plattformens attityd i landningsögonblicket.
Leitner, Jesse. "Helicopter nonlinear control using adaptive feedback linearization". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/11985.
Testo completoLine, Andrew James. "Computational modelling of helicopter high-frequency dynamics". Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413420.
Testo completoWallace, Malcolm William George. "Improvements to Helicopter Indirect Structural Health Management". Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503148.
Testo completoJoy, Christopher Iain Harold. "GPS assisted helicopter photogrammetry for highway profiling". Thesis, University of Nottingham, 1998. http://eprints.nottingham.ac.uk/11462/.
Testo completo