Results 201 to 210 of about 1,279 (239)
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The Estimation of the Unsteady Aerodynamic Force Applied to a Turret in Flight
44th AIAA Plasmadynamics and Lasers Conference, 2013The spatially-temporally-resolved pressure field on a surface of a hemisphere-on-cylinder optical turret was characterized in a wind tunnel at M = 0.33 using fast-response Pressure Sensitive Paint (PSP), simultaneously with 8 pressure sensors. A sparse unsteady pressure field was also obtained in-flight for subsonic speeds of M = 0.5 on the Airborne ...
Nicholas De Lucca +7 more
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The computation of second-order accurate unsteady aerodynamic generalized forces
26th Structures, Structural Dynamics, and Materials Conference, 1985A classical variational statement is used to derive special properties of a weighted residual method. It is shown that some weighted integral of the sought solution can be obtained to second-order accuracy in the solution to the original and adjoint problems.
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Methods for the Wind-Tunnel Measurement of Unsteady Nonlinear Aerodynamic Forces
AIAA Journal, 1970Unsteady nonlinear aerodynamic loads measurements in wind tunnel, using linearized mathematical ...
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Parameter identification of unsteady aerodynamic forces for elastic vehicles
Astrodynamics Conference, 1992In this paper, a method for identifying unsteady aerodynamic forces of elastic vehicles is proposed. We utilize the concept of "indicial function" to establish the practical mathematical model for the consideration of unsteady aerodynamic forces. A standard measurement equation satisfied by aerodynamic indicia1 functions is derived fromlongitudinal ...
CHEN SHILU, XIAOFEI XIONG
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Unsteady aerodynamic forces at low airfoil pitching rates
6th Applied Aerodynamics Conference, 1988Abstract : Experiments were conducted on a NACA-0015 airfoil undergoing low constant pitch rates to study the effects of dynamic stall formation on the airfoil upper surface pressure field. The airfoil was pitched about pivot locations of 0.25c, 05c, and 0.75c at nondimensional pitch rates below 0.2.
JULIE ALBERTSON +2 more
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The simulation of unsteady aerodynamic cross wind forces on trains
Journal of Wind Engineering and Industrial Aerodynamics, 2010Abstract This paper describes an investigation of the effect of cross winds on train dynamic systems. It considers the nature of the fluctuating cross wind and how such cross winds produce fluctuating forces. A simple method for calculating the wind time history at the position of a moving vehicle is firstly set out, that is computationally much less
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Prediction of Unsteady Aerodynamic Forces on Maneuvering Delta Wings
Journal of Fluids and Structures, 1995Abstract A semi-empirical model was developed to study the breakdown effects on maneuvering delta wings performing very high angle of attack excursions. The basic vortical flow model used was the Brown & Michael model and an unsteady source distribution was found to simulate the breakdown of the leading edge vortices. The source distribution is based
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Optimisation of unsteady aerodynamic forces for aircraft aeroservoelastic studies
2008One main aspect of the aeroservoelasticity is the optimization of the unsteady generalized aerodynamic forces Q(k, M) from the frequency domain into the Laplace domain Q(s), where k represents the reduced frequency, M is the Mach number and s is the Laplace variable.
R. M. Botez, A. D. Dinu, I. Cotoi
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Forced internal unsteady aerodynamics
26th Aerospace Sciences Meeting, 1988ERIC STEPHEN +4 more
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Unsteady aerodynamic force approximation for flutter prediction
2022Charles F. Promio +4 more
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