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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.
41

Adaptive control of micro air vehicles /

Matthews, Joshua Stephen, January 2006 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Electrical and Computer Engineering, 2006. / Includes bibliographical references (p. 139-140).
42

Autonomous unmanned ground vehicle for non-destructive testing of fiber reinforced polymer bridge decks

Mercer, Anthony Scott. January 2006 (has links)
Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains x, 100 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-86).
43

Application of concurrent engineering methods to the design of an autonomous aerial robot

Ingalls, Stephen A. 12 1900 (has links)
No description available.
44

Flow control over a micro unmanned aerial vehicle using synthetic jet actuators

Fung, Pearl Haiyan 05 1900 (has links)
No description available.
45

Modelling and control of unmanned ground vehicles.

Tran, Thanh Hung January 2007 (has links)
University of Technology, Sydney. Faculty of Engineering. / The thesis focuses on issues of vehicle modelling incorporating wheel-terrain interaction and low-level control design taking into account uncertainties and input time delay. Addressing these issues is of significant importance in achieving persistent autonomy for outdoor UGVs, especially when navigating on unprepared terrains. The test-bed vehicle used for this research is retrofitted from an all-terrain 20-hp, 0.5-tonne vehicle. Its driveline system consists of an internal combustion engine, continuous variable transmission (CVT), gearbox, differential, chains, and eight wheels. The vehicle is driven in the skid-steering mode, which is popular for many off-road land-vehicle platforms. In this thesis, a comprehensive approach is proposed for modelling the driveline. The approach considers the difference in speed between two outputs of the differential and the turning mechanism of the vehicle. It describes dynamics of all components in the vehicle driveline in an integrated manner with the vehicle motion. Given a pattern of the throttle position, left and right braking efforts as the inputs, the dynamic behaviour of the wheels and other components of the UGV can be predicted. For controlling the vehicle at the low level, PID controllers are firstly used for all actuators. As many components of the vehicle exhibit nonlinearities and time delay, the large overshoots encountered in the outputs can lead to undesirable vehicle behaviours. To alleviate the problem, a novel control approach is proposed for suppression of overshoots resulting from PID control. Sliding mode control (SMC) is employed, for this, with time delay compensated by using an output predictor. As a result, the proposed approach can improve significantly system robustness and reduce substantially step response overshoot. Notably, the design is generic in that it can be applied for many dynamic processes. Knowledge of the interaction between the UGV and the terrain plays an important role in increasing its autonomy and securing the safety for off-road locomotion. In this regard, vehicle kinematic equations are combined with the theory of terramechanics for dynamic modelling of the interaction between the vehicle wheels and a variety of terrain types. Also, a fast algorithm is developed to enable online implementation. The novel interaction model takes into account the relationship between normal stresses, shear stresses, and shear displacement of the terrain that is in contact with the wheels in deriving the three-dimensional reaction forces. Finally, all modelling and control algorithms are integrated into a unique simulator for emulating the vehicle mobility characteristics. In particular, the wheel’s slip and rolling resistance can also be derived to provide useful information for closed-loop control when the UGV is navigating in an unknown environment. The simulator, as a tool for analysing the vehicle mobility, is helpful for further research on relevant topics such as traction control, safe and effective locomotion.
46

Governance structure and weapon innovation : the case of unmanned aerial vehicles /

Rosenwasser, Jon Jason. January 2004 (has links)
Thesis (Ph.D.)--Tufts University, 2004. / Adviser: Robert L. Pfaltzgraff, Jr. Submitted to the Fletcher School of Law and Diplomacy. Includes bibliographical references (leaves 421-445). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
47

Development of a low cost controller and navigation system for unmanned ground vehicle

Muppidi, Shashidhar. January 2008 (has links)
Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains x, 141 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 76-78).
48

Relative positioning of unmanned ground vehicles using ultrasonic sensors

Henderson, Harold Paulk, Bevly, David M., January 2008 (has links) (PDF)
Thesis (M.S.)--Auburn University, 2008. / Abstract. Vita. Includes bibliographical references.
49

Application of copper indium gallium diselenide photovoltaic cells to extend the endurance and capabilities of unmanned aerial vehicles

Hurd, William R. January 2009 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2009. / Thesis Advisor(s): Michael, Sherif. "September 2009." Description based on title screen as viewed on 5 November 2009. Author(s) subject terms: Thin-Film photovoltaics, CIGS, unmanned aerial systems, UAV, solar plane, Maximum Power Point Tracker (MPPT), lithium polymer. Includes bibliographical references (p. 115-125). Also available in print.
50

Biologically inspired vision and control for an autonomous flying vehicle /

Garratt, Matthew A. January 2007 (has links)
Thesis (Ph.D.) -- Australian National University, 2007.

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