نتایج جستجو برای: unsteady aerodynamics

تعداد نتایج: 13186  

Journal: :Journal of Fluid Mechanics 2022

To generate aerodynamic forces required for flight, two-winged insects ( Diptera ) move their wings back and forth at high wing-beat frequencies. This results in exceptionally wing-stroke accelerations, consequently relatively acceleration-dependent fluid forces. Quasi-steady force models have reasonable success relating the generated to instantaneous wing motion kinematics. However, existing a...

Journal: :Journal of Sound and Vibration 2024

This article investigates the applicability of a recently proposed, nonlinear sparse Bayesian learning (NSBL) algorithm to identify and estimate complex aerodynamics limit cycle oscillations. NSBL provides semi-analytical framework for determining data-optimal model nested within (potentially) over-parameterized model. is particularly relevant dynamical systems where modelling approaches involv...

2011
L Librescu D - H Kim I Lee S Schober

By using a combined analytical–computational methodology, a unified modelling of aerodynamic indicial functions covering the incompressible, subsonic compressible, transonic, and supersonic flight speed regimes is presented. The procedure is carried out in conjunction with a computational fluid dynamic analysis. For a plunging–pitching airfoil, selected unsteady aerodynamic load expressions hav...

2006
Weihua Su Carlos E. S. Cesnik

This paper presents a method to model and analyze the coupled nonlinear flight dynamics and aeroelasticity of highly flexible flyingwings. A low-order nonlinear strain-based finite element framework is used, which is capable of capturing the fundamental impact of geometrically nonlinear effects in a computationally effective formulation target for preliminary vehicle design and control evaluati...

2008
Jack J. McNamara Peretz P. Friedmann

A review of the state-of-the-art in hypersonic aeroelasticity and aerothermoelasticity is provided. Recently, the main focus in this area has been on the development of computational aeroelastic and aerothermoelastic methods capable of studying complete hypersonic vehicles. Thus, in addition to a survey of studies conducted in this area over the past six decades, two important issues are a focu...

2016
Jeffrey Feaster Francine Battaglia

Bird flight is an area of significant interest due to the utilization and control of unsteady aerodynamic effects via flapping. Although modern aerodynamics were originally inspired by bird flight, contemporary computational and experimental work associated with flapping flight focuses on insect flight. The purpose of the present paper is to improve the understanding of avian flight by investig...

2012
K. Zhang Z. Wang A. Behal P. Marzocca

The model-free control of aeroelastic vibrations of a non-linear 2-D wing-flap system operating in supersonic flight speed regimes is discussed in this paper. A novel continuous robust controller design yields asymptotically stable vibration suppression in both the pitching and plunging degrees of freedom using the flap deflection as a control input. The controller also ensures that all system ...

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