Results 191 to 200 of about 1,279 (239)
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The Mean Power of Forces and Moments in Unsteady Aerodynamics
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1992AbstractThe balance of mechanical energy serves as the starting point for a unified and consistent approach to the two basic and inherent mechanisms in unsteady aerodynamics, propulsion and flutter. Both phenomena are mutually dependent and interchangeable with each other by a mere variation of the reduced frequency as the governing magnitude with ...
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Aerodynamic Force Modeling for Unsteady Wing Maneuvers
52nd Aerospace Sciences Meeting, 2014Abstract : We report on the development of an aerodynamic force model for a at-plate wing undergoing unsteady motions of surging, pitching, and the combination thereof in two- dimensional ow. This investigation aims to extend the conventional quasi-steady aero- dynamic theory to account for the influence of large-scale vortices generated from the ...
Ryan T. Jantzen +3 more
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Unsteady aerodynamics on a tapered prism under forced excitation
Engineering Structures, 2021Abstract Tapered buildings have been widely built in recent years and its aerodynamic performance remains unclear and would be much different from that on traditional buildings. In this paper, unsteady pressures on a tapered test model under different wind speeds and amplitudes of oscillation were sampled during forced vibrations.
Chen, Zengshun +5 more
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Unsteady Aerodynamic Forces Measured on a Fluttering Profile
Volume 4: Fluid-Structure Interaction, 2014The study presents evaluation of optical measurements of the air flow field near the fluttering profile NACA0015 with two-degrees of freedom, Mach number of the flutter occurrence were M=0.21 and M=0.45. Aerodynamic forces (drag and lift components) were evaluated independently on the upper and lower surfaces of the profile.
Igor Zolotarev +2 more
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Unsteady supersonic aerodynamic forces on an oscillating circular cylindrical shell.
AIAA Journal, 1971Unsteady supersonic aerodynamic forces on an oscillating circular cylindrical shell are derived from the linearized equation of a potential flow on the basis of the assumption of circumferential wave number n ^> 1. The generalized aerodynamic forces calculated by the present aerodynamic theory are compared with those of the "exact" theory, the ...
Matsuzaki, Yuji, Kobayashi, Shigeo
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Modeling the unsteady aerodynamic forces of a maneuvering rotor
Aircraft Engineering and Aerospace Technology, 1999The details of predicting the aerodynamic forces of maneuvering helicopter rotors are discussed in this paper. A new approach to modeling the unsteady rotor aerodynamic forces is presented based on the insight into nonuniform induced velocity distribution, inflow dynamics and unsteady airfoil behavior. For a specified maneuver, the rotor control inputs
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The 3D Unsteady Aerodynamic Forces: The Forced Vibration of Bladed Discs
1998The main problem for a bladed disc assembly under running conditions is the response levels when the excitation frequencies coincide natural frequencies of the structure during operation. Generally in the bladed analysis the excitation force are assumed in advance, although there are papers where these forces were calculated from the very simple flow ...
V. Gnesin, R. Rządkowski
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Modeling the Unsteady Aerodynamic Forces on Small-Scale Wings
47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009The goal of this work is to develop low order dynamical systems models for the unsteady aerodynamic forces on small wings and to better understand the physical characteristics of unsteady laminar separation. Reduced order models for a fixed, high angle of attack flat plate are obtained through Galerkin projection of the governing Navier-Stokes ...
Steven Brunton, Clarence Rowley
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Aerodynamic force by Lamb vector integrals in unsteady compressible flows
International Journal of Numerical Methods for Heat & Fluid FlowPurpose This study aims to propose an aerodynamic force decomposition which, for the first time, allows for thrust/drag bookkeeping in two-dimensional viscous and unsteady flows. Lamb vector-based far-field methods are used at the scope, and the paper starts with extending recent steady compressible formulas to the unsteady regime.
Mauro Minervino, Renato Tognaccini
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Method of Unsteady Aerodynamic Forces Approximation for Aeroservoelastic Interactions
Journal of Guidance, Control, and Dynamics, 2002Introduction The adverse interactions occurring between the three main disciplines : unsteady aerodynamics, aeroelasticity and servo-controls are called aeroservoelastic interactions. These interactions can be described mathematically by a system of equations in a state space form.
Iulian Cotoi, Ruxandra M. Botez
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