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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.
21

A Weighted Residual Framework for Formulation and Analysis of Direct Transcription Methods for Optimal Control

Singh, Baljeet 2010 December 1900 (has links)
In the past three decades, numerous methods have been proposed to transcribe optimal control problems (OCP) into nonlinear programming problems (NLP). In this dissertation work, a unifying weighted residual framework is developed under which most of the existing transcription methods can be derived by judiciously choosing test and trial functions. This greatly simplifies the derivation of optimality conditions and costate estimation results for direct transcription methods. Under the same framework, three new transcription methods are devised which are particularly suitable for implementation in an adaptive refinement setting. The method of Hilbert space projection, the least square method for optimal control and generalized moment method for optimal control are developed and their optimality conditions are derived. It is shown that under a set of equivalence conditions, costates can be estimated from the Lagrange multipliers of the associated NLP for all three methods. Numerical implementation of these methods is described using B-Splines and global interpolating polynomials as approximating functions. It is shown that the existing pseudospectral methods for optimal control can be formulated and analyzed under the proposed weighted residual framework. Performance of Legendre, Gauss and Radau pseudospectral methods is compared with the methods proposed in this research. Based on the variational analysis of first-order optimality conditions for the optimal control problem, an posteriori error estimation procedure is developed. Using these error estimates, an h-adaptive scheme is outlined for the implementation of least square method in an adaptive manner. A time-scaling technique is described to handle problems with discontinuous control or multiple phases. Several real-life examples were solved to show the efficacy of the h-adaptive and time-scaling algorithm.
22

Advances in low-thrust trajectory optimization and flight mechanics /

Gao, Yang, January 2003 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references (leaves 225-232). Also available on the Internet.
23

Advances in low-thrust trajectory optimization and flight mechanics

Gao, Yang, January 2003 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references (leaves 225-232). Also available on the Internet.
24

Implementation issues of real-time trajectory generation on small UAVs /

Kingston, Derek Bastian, January 2004 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Electrical and Computer Engineering, 2004. / Includes bibliographical references (p. 75-79).
25

Optimization and control of nonlinear systems with inflight constraints

Speyer, Jason Lee. January 1968 (has links)
Thesis (Ph. D.)--Harvard University, 1968. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 1-5 (last group)).
26

Application of automatic differentiation to trajectory optimization via direct multiple shooting

Garza, David Marcelo 28 August 2008 (has links)
Not available / text
27

On minimum time six-degree-of-freedom turning maneuvers for a high-alpha fighter aircraft

Hoffman, Eric 08 1900 (has links)
No description available.
28

Optimization and control of nonlinear systems with inflight constraints

Speyer, Jason Lee. January 1968 (has links)
Thesis (Ph. D.)--Harvard University, 1968. / Typescript. Includes bibliographical references (leaves 1-5 (last group)). Also issued in print.
29

Real-time trajectory planning for ground and aerial vehicles in a dynamic environment

Yang, Jian. January 2008 (has links)
Thesis (Ph.D.)--University of Central Florida, 2008. / Adviser: Zhihua Qu. Includes bibliographical references (p. 117-121).
30

Optimal vertical plane booster guidance including pitch dynamics /

Waldron, William Michael, January 1996 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1996. / Vita. Abstract. Includes bibliographical references (leaves 90-92). Also available via the Internet.

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