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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Optimal feature projections for enhanced vibration-based damage identification with an application to wind turbine blades

Hoell, Simon January 2016 (has links)
No description available.
82

Evolutionary robotics in high altitude wind energy applications

Furey, Allister David John January 2012 (has links)
Recent years have seen the development of wind energy conversion systems that can exploit the superior wind resource that exists at altitudes above current wind turbine technology. One class of these systems incorporates a flying wing tethered to the ground which drives a winch at ground level. The wings often resemble sports kites, being composed of a combination of fabric and stiffening elements. Such wings are subject to load dependent deformation which makes them particularly difficult to model and control. Here we apply the techniques of evolutionary robotics i.e. evolution of neural network controllers using genetic algorithms, to the task of controlling a steerable kite. We introduce a multibody kite simulation that is used in an evolutionary process in which the kite is subject to deformation. We demonstrate how discrete time recurrent neural networks that are evolved to maximise line tension fly the kite in repeated looping trajectories similar to those seen using other methods. We show that these controllers are robust to limited environmental variation but show poor generalisation and occasional failure even after extended evolution. We show that continuous time recurrent neural networks (CTRNNs) can be evolved that are capable of flying appropriate repeated trajectories even when the length of the flying lines are changing. We also show that CTRNNs can be evolved that stabilise kites with a wide range of physical attributes at a given position in the sky, and systematically add noise to the simulated task in order to maximise the transferability of the behaviour to a real world system. We demonstrate how the difficulty of the task must be increased during the evolutionary process to deal with this extreme variability in small increments. We describe the development of a real world testing platform on which the evolved neurocontrollers can be tested.
83

Sail aerofoil applied to a vertical-axis wind turbine

Robert, Jean. January 1977 (has links)
No description available.
84

A new method for using passive acoustics for engine analysis

Norris, William J. January 2005 (has links)
Thesis (Ph. D.)--University of Nevada, Reno, 2005. / "December, 2005." Includes bibliographical references (leaves 65-66). Online version available on the World Wide Web.
85

Winds of change : renewable energy and the location of wind turbines in Prince Edward County, Ontario /

Lopes, Sandra L. January 2004 (has links)
Thesis (M.A.)--York University, 2004. Graduate Programme in Geography. / Typescript. Includes bibliographical references (leaves 170-178). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL:http://gateway.proquest.com/openurl?url%5Fver=Z39.88-2004&res%5Fdat=xri:pqdiss&rft%5Fval%5Ffmt=info:ofi/fmt:kev:mtx:dissertation&rft%5Fdat=xri:pqdiss:MQ99350
86

On thermal mismatch and thermal gradients and the failure of thermal barrier coatings

Shi, Jun. January 2006 (has links)
Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Anette M. Karlsson, Dept. of Mechanical Engineering. Includes bibliographical references.
87

Effects of voltage unbalance and system armonics on the performance of doubly fed induction wind generators

Kiani, Morgan Mozhgan. January 2009 (has links)
Thesis (Ph.D.)--University of Texas at Arlington, 2009.
88

Improved aerothermodynamic instrumentation of an Allison T63-A-700 gas turbine engine /

Bruan, Kenneth C. January 2002 (has links) (PDF)
Thesis (M.S.)--Naval Postgraduate School, 2002. / Thesis advisor(s): Knox T. Millsaps. Includes bibliographical references (p. 41). Also available online.
89

The development of an accelerated testing facility for the study of deposits in land-based gas turbine engines /

Jensen, Jared W. January 2004 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2004. / Includes bibliographical references (p. 107-110).
90

Evaluation of nitrogen oxide emissions during startup of simple cycle combustion turbines

Mulkey, Cynthia E. Dzurik, Andrew Albert, January 2003 (has links)
Thesis (M.S.)--Florida State University, 2003. / Advisor: Dr. Andrew A. Dzurik, Florida State University, FAMU-FSU College of Engineering, Dept. of Civil and Environmental Engineering. Title and description from dissertation home page (February 25, 2004). Includes bibliographical references.

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