Aerodynamic Loads
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Aerodynamic coefficient prediction using neural networks.
The present work discusses the application of neural networks for the accurate prediction of aerodynamic coefficients of airfoil and wing-body configurations. Meta-models based on neural-network are able to handle non-linear problems with a large amount of variables. In this highlight, an efficient methodology employing neural networks for predicting aerodyn
Publicado em: 2008
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14. Aeroservoelastic analysis of the blade-sailing phenomenon in the helicopter-ship dynamic interface.
This thesis proposes a Rotary-Wing Aeroservoelasticity approach to the modeling, analysis and control of the blade-sailing phenomenon in the helicopter-ship dynamic interface (DI), based on the identification, response evaluation and control of flow and ship motion induced loads, during the engagement/disengagement flight regimes, in order to establish some
Publicado em: 2007
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15. Aircraft loads assessment for windmilling sustained engine imbalance condition.
The failure of an aircraft engine fan blade produces an unbalanced rotor condition. Even after the engine is shutdown, the aerodynamic forces may keep the rotors running during the remainder of the flight. This condition can induce significant vibratory loads throughout the airframe that may damage the airframe structure and critical equipments and also affe
Publicado em: 2005
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16. Influência das vibrações do cabo na instabilidade aeroelástica de uma viga simples estaiada. / Influence of cable vibrations on the aero-elastic instability of a cable-stayed beam.
This paper is concerned with determining wind critical velocities and post-critical vibration amplitudes in a cable-stayed beam, under wind-rain condition. It is considered the cable sag due to the dead load plus the non-linear coupling between the vibration of both the cable and the beam. Three modes are of special interest, namely the first global mode (be
Publicado em: 2005
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17. Simulação numérica da interação entre uma nuvem incidente de vórtices e uma aerofólio através do método dos vórtices
Este estudo simula numericamente, através do Método de Vórtices, a interação entre uma nuvem de circulação incidente e um aerofólio NACA 0018 posicionado com ângulos de ataque de 0 e 5. O número de Reynolds utilizado é de 5x105 e o escoamento é considerado incompressível. Devido a complexidade do fenômeno de geometria tridimensional, apenas uma
Publicado em: 2005
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18. Numerical model for the simulation of fixed wings aeroelastic response
A numerical model for the simulation of fixed wings aeroelastic response is presented. The methodology used in the work is to treat the aerodynamics and the structural dynamics separately and then couple them in the equations of motion. The dynamic characterization of the wing structure is done by the finite element method and the equations of motion are wri
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-06
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19. Vortex method with turbulence sub-grid scale modelling
In this paper a method for the simulation of convection and diffusion of the vorticity, generated on a body surface is presented. A purely Lagrangian scheme is used for the vorticity convection, and thereby avoiding mesh associated problems. The body surface is simulated by straight-line panels, with constant-strength vortex distribution. The strength of the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04
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20. Non-Linear Unsteady Aerodynamic Response Approximation Using Multi-Layer Functionals
Non-linear functional representation of the aerodynamic response provides a convenient mathematical model for motion-induced unsteady transonic aerodynamic loads response, that accounts for both complex non-linearities and time-history effects. A recent development, based on functional approximation theory, has established a novel functional form; namely, th
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-03
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21. Numerical model for the simulation of the aeroelastic response of fixed wings. / Modelo numérico para simulação da resposta aeroelástica de asas fixas.
A numerical model for the simulation of the aeroelastic response of fixed wings is proposed. The methodology used in the work is to treat the aerodynamic and the structural dynamics separately and then couple them in the equation of motion. The dynamic characterization of a prototype wing is done by the finite element method and the equation of motion is wri
Publicado em: 2002
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22. Determinação da rigidez e amortecimento equivalente proveniente do fluido escoando e interagindo com placas flexiveis : teoria e constatações experimentais
The understanding and modelling of the stiffness and the damping behavior of structures when subjected to a flow field, is still a very complex problem, dealing with the interaction of two major fields of mechanical sciences. The classical theory of elasticity deals with strains of flexible bodies under predefined external loads. Generally, the external load
Publicado em: 2001
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23. Expressão da incerteza de medição associada a um ensaio aeronautico em tunel de vento subsonico
This thesis describes a method to express the uncertainty of measurements associatec with canying out an aeronautical test in the Subsonic Wind Tunnel T A-2, of th( Aerodynamic Testing Laboratory ASA-L. at the Institute of Aeronautics and Space - IAE at the Aerospace Technical Center - CTA The methodology employed is tha recommended by the international metr
Publicado em: 2000