Vehicle Drag
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Aerofoil Design for Unmanned High-Altitude Aft-Swept Flying Wings
ABSTRACT In this paper, 12 new aerofoils with varying thicknesses for an aft-swept flying wing unmanned air vehicle have been designed using a MATLAB tool which has been developed in-house. The tool consists of 2 parts in addition to the aerodynamic solver XFOIL. The first part generates the aerofoil section geometry using a combination of PARSEC and Bezier-
J. Aerosp. Technol. Manag.. Publicado em: 2017-09
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2. Relative Motion Guidance, Navigation and Control for Autonomous Orbital Rendezvous
ABSTRACT: In this paper, the dynamics of the relative motion problem in a perturbed orbital environment are exploited based on Gauss' variational equations. The relative coordinate frame (Hill frame) is studied to describe the relative motion. A linear high fidelity model is developed to describe the relative motion. This model takes into account primary gra
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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3. Trajectory Control During an Aeroassisted Maneuver Between Coplanar Circular Orbits
ABSTRACT: This paper presents the simulation results of an aeroassisted maneuver around the Earth, between coplanar circular orbits, from a geostationary orbit to a low orbit. The simulator developed considers a reference trajectory and a trajectory perturbed by external disturbances combined with non-idealities of sensors and actuators. It is able to operat
J. Aerosp. Technol. Manag.. Publicado em: 2014-06
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4. Calculation of The Vehicle Drag and Heating Reduction at Hypervelocities with Laser-Induced Air Spike
ABSTRACT: Scientists at the laboratory of Força Aérea Brasileira (FAB) have demonstrated experimentally that laser-induced "air spikes" (DEAS) may reduce effectively both total vehicle drag and heating at hypervelocities. Now, we apply the Rayleigh flow to directly determine the degree of reduction in vehicle drag and convective heat flux into the airframe
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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5. Métodos de redução do arrasto e seus impactos sobre a estabilidade veicular / Methods of drag reduction and the impacts on the vehicle aerodynamics stability
The growing environmental concern and the necessity to create more efficient products have motivated researchers to conduct studies about the aerodynamic vehicle. These two aspects are the main reasons which are promoting a great demand for knowledge in this theme. This science may be considered relatively new and still lacks more databases. Understand how a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/06/2011
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6. Virtual boundary method applied to a problem of computational aerolastic analysis / Método da fronteira virtual aplicado em um problema de análise aeroelástica computacional
The behavior study of a profile of a typical aerolastic section, with Reynolds in range of micro aerial vehicle, is the main focus of this work, taking as objective the estimation of parameters of flutter phenomenon. The research analyzes of the flow of a incompressible fluid on a body (cylinder and airfoil profile) at steady state and oscillating with const
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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7. Simulation of viscous flow around a circular cylinder near a moving ground
The objective of this paper is to study the vortex shedding from a circular cylinder near a moving ground; this is done using the Vortex Method. A moving ground has been widely used in the field of experimental vehicle aerodynamics, especially of high-performance racing cars, to properly consider the ground effect on the vehicles aerodynamic. In experimental
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-09
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8. Modelagem e identificação de parâmetros hidrodinâmicos de um veículo robótico submarino. / Modelling and Identification of hydrodynamic parameters of an underwater robotic vehicle.
In this work, a procedure for experimental identification of hydrodynamic coefficients of unmanned underwater vehicles is presented. At first, the development of a testbed for research on dynamics, control, and navigation of underwater vehicles is presented. This experimental platform includes: 1) a open-frame semi-autonomous unmanned underwater vehicle name
Publicado em: 2008
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9. Investigação Experimental da Adição de Energia por Laser em Escoamento Hipersônico de Baixa Densidade
The possibility of reducing the aerodynamic drag and heating of a hypersonic vehicle by addition energy to the air ahead of it is an attractive idea directed toward the hypersonic field. (Mach>5) and can be realized by laser induced plasma generation. In this context, this work presents original results in the experimental investigation of the energy addi
Publicado em: 2008
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10. Ocurrence of Salmonella spp. in chain avian of the central region in Mato Grosso do Sul / Ocorrencia de Salmonella spp. na cadeia avícola da região central de Mato Grosso do Sul
The birds can constitute a vehicle of diffusion for other animal species and human beings, causing food borne outbreak for the consumption of products badly elaborated or conserved. In this context, one of the main microorganisms is the Salmonella that has caused constant concerns to the sanitary authorities given to the complexity and pathogenicity. Salmone
Publicado em: 2007
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11. Algoritmo genético aplicado à otimização de asas de material compósito de veículos aéreos não tripulados / Genetic algorithm applied to optimization of composite material wings of unmanned air vehicles
The advent of the unmanned air vehicles (UAVs) represents a paradigm break in the aeronautical field. The project concepts involved in the development of UAVs are revised and its potential applications are rose. Also the issues related to UAVs operation are assessed and the regulatory questions involved in their certification and integration to the civil air
Publicado em: 2005
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12. Estudo de transferências orbitais incluindo manobras aeroassistidas / Study of orbital transfers with aeroassisted maneuvers
This work presents an analysis of space missions through the development of a software package for the calculation of aerodynamic maneuvers and of the required thrust maneuvers for their implementation. Besides the numerical development, an analytical study contemplates the accomplishment of the acroassisted phase of this maneuver type. This analysis include
Publicado em: 2001