Aeronautical Engineering: A special bibliography with indexes, supplement 74

This special bibliography lists 295 reports, articles, and other documents introduced into the NASA scientific and technical information system in August 1976

Knowledge-based flow field zoning

Automation flow field zoning in two dimensions is an important step towards easing the three-dimensional grid generation bottleneck in computational fluid dynamics. A knowledge based approach works well, but certain aspects of flow field zoning make the use of such an approach challenging. A knowledge based flow field zoner, called EZGrid, was implemented and tested on representative two-dimensional aerodynamic configurations. Results are shown which illustrate the way in which EZGrid incorporates the effects of physics, shape description, position, and user bias in a flow field zoning

Index to 1981 NASA Tech Briefs, volume 6, numbers 1-4

Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This index for 1981 Tech Briefs contains abstracts and four indexes: subject, personal author, originating center, and Tech Brief Number. The following areas are covered: electronic components and circuits, electronic systems, physical sciences, materials, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

Aeronautical engineering: A continuing bibliography with indexes (supplement 259)

This bibliography lists 774 reports, articles, and other documents introduced into the NASA scientific and technical information system in November, 1990. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Aeronautical Engineering: A continuing bibliography with indexes, supplement 106

This bibliography lists 388 reports, articles, and other documents introduced into the NASA scientific and technical information system in January 1979

A survey of free software for the design, analysis, modelling, and simulation of an unmanned aerial vehicle

The objective of this paper is to analyze free software for the design, analysis, modelling, and simulation of an unmanned aerial vehicle (UAV). Free software is the best choice when the reduction of production costs is necessary; nevertheless, the quality of free software may vary. This paper probably does not include all of the free software, but tries to describe or mention at least the most interesting programs. The first part of this paper summarizes the essential knowledge about UAVs, including the fundamentals of flight mechanics and aerodynamics, and the structure of a UAV system. The second section generally explains the modelling and simulation of a UAV. In the main section, more than 50 free programs for the design, analysis, modelling, and simulation of a UAV are described. Although the selection of the free software has been focused on small subsonic UAVs, the software can also be used for other categories of aircraft in some cases; e.g. for MAVs and large gliders. The applications with an historical importance are also included. Finally, the results of the analysis are evaluated and discussed—a block diagram of the free software is presented, possible connections between the programs are outlined, and future improvements of the free software are suggested. © 2015, CIMNE, Barcelona, Spain.Internal Grant Agency of Tomas Bata University in Zlin [IGA/FAI/2015/001, IGA/FAI/2014/006

Aeronautical Engineering: A continuing bibliography with indexes, supplement 155, December 1982

This bibliography lists 272 reports, articles and other documents introduced into the NASA scientific and technical information system in November 1982

Aeronautical Engineering: A cumulative index to the 1984 issues of the continuing bibliography

This bibliography is a cumulative index to the abstracts contained in NASA SP-7037(171) through NASA SP-7037(182) of Aeronautical Engineering: A Continuing Bibliography. NASA SP-7037 and its supplements have been compiled through the cooperative efforts of the American Institute of Aeronautics and Astronautics (AIAA) and the National Aeronautics and Space Administration (NASA). This cumulative index includes subject, personal author, corporate source, foreign technology, contract, report number, and accession number indexes

Aeronautical Engineering: A continuing bibliography with indexes (supplement 188)

This bibliography lists 477 reports, articles and other documents introduced into the NASA scientific and technical information system in May 1985. The coverage includes documents on the engineering and theoretical aspects of design, construction, evaluation, testing, operation, and performance of aircraft (including aircraft engines) and associated components, equipment and systems

Aerodynamics, stability and control computational analysis for UAVs

L’objectiu d’aquest projecte és l’estudi aerodinàmic d’un UAV (vehicle aeri no tripulat). Aquest tipus de aeronaus són utilitzades comunament en molts països per desenvolupar tasques com vigilància, recerca o combat degut a la seva autonomia de vol; un UAV pot volar sense un pilot a bord i gràcies a això, pot realitzar tasques molt perilloses sense cap risc. Els UAVs analitzats en aquest projecte són el Megastar i el Shadow, els quals pertanyen a la EPSC i són utilitzats pel grup Icarus. L’objectiu d’estudi es la obtenció dels coeficients aerodinàmics de les dos aeronaus per així completar l’estudi de les equacions d’estabilitat i control necessaris per calibrar la programació del pilot automàtic. Per obtenir aquests coeficients s’han utilitzat dos programes diferents: Fluent i Datcom. Fluent es un programa de dinàmica de fluids computacional i el Datcom és un programa que et calcula els coeficients aerodinàmics d’una aeronau. La necessitat d’utilitzar ambdós programes recau en assegurar-nos al màxim d’obtenir tots els paràmetres necessaris i per poder validar els resultats comparant-los entre ells. Les mesures de les geometries i el seu modelatge en el programa de disseny han sigut els passos previs a la simulació de les aeronaus. En aquest punt, han estat simulats en moltes situacions diferents com diferent angles d’atac per així tenir els valors més realistes com es pugui. Els resultats obtinguts mostren similituds prou significants entre els dos programes en els coeficients aerodinàmics bàsics. L’aspecte on difereixen més és l’angle d’atac crític, però això pot ser degut a la diferència entre com s’introdueixen els paràmetres d’entrada entre els dos programes. D’aquesta manera, els resultats mostren que Fluent deuria ser utilitzat per calcular paràmetres físics com velocitat o pressió i pels coeficients bàsics (Cl i Cd), gràcies a la seva simulació més real. Per contra, Datcom pot ser utilitzat com una aproximació per conèixer un munt de coeficients aerodinàmics gràcies als seus ràpids càlculs i a la seva no perfecta entrada de dades de la geometria