• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 121
  • 8
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 161
  • 101
  • 43
  • 41
  • 32
  • 26
  • 24
  • 24
  • 23
  • 20
  • 17
  • 15
  • 14
  • 14
  • 13
  • 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.
101

Design and evaluation of an integrated, self-contained GPS/INS shallow-water AUV navigation system (SANS)

Walker, Randy G. January 1996 (has links) (PDF)
Thesis (M.S. in Electrical Engineering and M.S. in Computer Science) Naval Postgraduate School, June 1996. / "June 1996." Thesis advisor(s): Xiaoping Yun, Robert B. McGhee. Includes bibliographical references (p. 155-157). Also available online.
102

A virtual world for an autonomous underwater vehicle/

Brutzman, Donald P. January 1994 (has links) (PDF)
Dissertation (Ph.D. in Computer Science) Naval Postgraduate School, December 1994. / "December 1994." Dissertation supervisor(s): Michael J. Zyda. Appendix G videotape located at VHS 5000052. Includes bibliographical references (p. 238-262). Also available online.
103

Testing the HG1700 inertial measurement unit for implementation into the AIRES unmanned underwater vehicle /

Gow, Joel A. January 2005 (has links) (PDF)
Thesis (M.S. in Applied Science (Physical Oceanography))--Naval Postgraduate School, June 2005. / Thesis Advisor(s): Anthony J. Healey, Edward B. Thornton. Includes bibliographical references (p. 49). Also available online.
104

Vertical plane obstacle avoidance and control of the REMUS autonomous underwater vehicle using forward look sonar /

Hemminger, Daniel L. January 2005 (has links) (PDF)
Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2005. / Thesis Advisor(s): Anthony J. Healey. Includes bibliographical references (p. 79). Also available online.
105

Stability analysis of a towed body for shipboard unmanned surface vehicle recovery /

Roberts, Scott D. January 2005 (has links) (PDF)
Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, March 2005. / Thesis Advisor(s): Fotis Papoulias. Includes bibliographical references (p. 63-64). Also available online.
106

The selection, integration, and evaluation of a payload for chemical plume detection on an autonomous underwater vehicle /

Pennell, Vanessa, January 2003 (has links)
Thesis (M.Eng.)--Memorial University of Newfoundland, 2003. / The CD-ROM contains Appendix D: mass spectrometer data. Bibliography: leaves 94-97.
107

Preliminary finite element modeling of a piezoelectric actuated marine propulsion fin /

Streett, Andrew R. January 2006 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 2006. / Typescript. Includes bibliographical references (leaves 132-137).
108

Analysis of lift and drag forces on the wing of the underwater glider

Meyers, Luyanda Milard January 2018 (has links)
Thesis (Master of Engineering in Mechanical Engineering)--Cape Peninsula University of Technology, 2018. / Underwater glider wings are the lifting surfaces of unmanned underwater vehicles UUVs depending on the chosen aerofoil sections. The efficiency as well as the performance of an underwater glider mostly depends on the hydrodynamic characteristics such as lift, drag, lift to drag ratio, etc of the wings. Among other factors, the geometric properties of the glider wing are also crucial to underwater glider performance. This study presents an opportunity for the numerical investigation to improve the hydrodynamic performance by incorporating curvature at the trailing edge of a wing as oppose to the standard straight or sharp trailing edge. A CAD model with straight leading edge and trailing edge was prepared with NACA 0016 using SolidWorks 2017. The operating conditions were setup such that the inlet speed varies from 0.1 to 0.5 m/s representing a Reynolds number 27.8 x 10ᵌ and 53 x 10ᵌ. The static pressure at different angles of attack (AOA) which varies from 2 to 16degrees at the increment of 2degrees for three turbulent models (K-Ԑ-standard, K-Ԑ-RNG and K-Ԑ-Realizable), was computed for upper and lower surfaces of the modified wing model using ANSYS Fluent 18.1. Thereafter the static pressure distribution, lift coefficient, drag coefficient, lift to drag ratio and pressure coefficient for both upper and lower surfaces were analysed. The findings showed that the lift and drag coefficient are influenced by the AOA and the inlet speed. If these parameters change the performance of the underwater glider changes as depicted by figure 5.6 and figure 5.7. The hydrodynamics of the underwater glider wing is optimized using the Cʟ/Cᴅ ratio as function of the operating conditions (AOA and the inlet speed). The investigation showed that the optimal design point of the AOA of 12 degrees and a corresponding inlet speed of 0.26m/s. The critical AOA matched with the optimal design point AOA of 12 degrees. It was also observed that Cp varies across the wing span. The results showed the Cp is higher closer to the fuselage while decreasing towards the mid-span and at the tip of the wing. This showed that the wing experiences more stress close to the fuselage than the rest of the wing span which implies that a higher structural rigidity is required close to the fuselage. The results of the drag and lift curves correspond to the wing characteristics typical observed for this type of aerofoil.
109

Desenvolvimento de critérios para projeto e análise de estruturas submersíveis. / Development of criteria for design and analysis of submersible structures.

Miguel Angel Buelta Martinez 23 February 1984 (has links)
Este trabalho apresenta um estudo sobre os recursos de análise estrutural disponíveis para submersíveis, sugere um critério de projeto estrutural próprio e desenvolve critérios de análise estrutural de submersíveis, após a fase de construção. No estudo dos recursos disponíveis é apresentado e analisado o atual nível de conhecimentos neste campos, a partir do levantamento de informações, muitas vezes restritas e confidenciais. Um critério de projeto é desenvolvido a partir de dados dispersos na bibliografia consultada, aos quais foram adicionados itens resultantes da experiência do autor. Os critérios de análise de submersíveis já construídos são desenvolvidos a partir de modelos analíticos ou de elementos finitos. Nestes, utiliza-se a vantagem da estrutura já estar fabricada, e portanto ser possível a obtenção de informações, que a nível de projeto necessitavam ser admitidas. São ainda desenvolvidos critérios para análise de resultados, com enfoque especial à avaliação de regiões estruturais que necessitem ser modificadas. Ao final são apresentadas as principais conclusões do trabalho e ressaltada a necessidade da continuidade das pesquisas que aprofundem vários aspectos levantados ao longo do texto. / The aim of this thesis work is three fold: to present a comphreensive study on structural analysis tools for submersible vehicles, to introduce a design criteria for new vessels and to develop methods for structural checkings for operating submersibles. In the first part, several data available at present time are discussed and analysed, although many of them are still considered either restricted or even confidential. Based on those data and on author\'s experience a design criteria is developed. Finally, the methods for analyzing operating vessels are obtained, starting from analytical models and also by using the finite element method approach. Those methods are more feasible from the stand point of final results, since all necessary data for the analysis are available. Within this context, the methods for analyzing operating submersibles are also very useful to evaluate structural parts which need either repair work or even modifications to face any new operating condition.
110

Search methods for an autonomous underwater vehicle using scalar measurements

Burian, Erik Alfred January 1996 (has links)
Thesis (S.M.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), 1996. / Includes bibliographical references (leaves 69-71). / by Erik Alfred Burian. / S.M.

Page generated in 0.0447 seconds