Geodesic
Numerical estimation of aircrafts' unsteady lateral-directional stability derivatives
Theoretical and applied mechanics, Tome 33 (2006) no. 4, p. 311

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A technique for predicting steady and oscillatory aerodynamic loads on general configuration has been developed. The prediction is based on the Doublet-Lattice Method, Slender Body Theory and Method of Images. The chord and span wise loading on lifting surfaces and longitudinal bodies (in horizontal and vertical plane) load distributions are determined. The configuration may be composed of an assemblage of lifting surfaces (with control surfaces) and bodies (with circular cross sections and a longitudinal variation of radius). Loadings predicted by this method are used to calculate (estimate) steady and unsteady (dynamic) lateral-directional stability derivatives. The short outline of the used methods is given in [1], [2], [3], [4] and [5]. Applying the described methodology software DERIV is developed. The obtained results from DERIV are compared to NASTRAN examples HA21B and HA21D from [4]. In the first example (HA21B), the jet transport wing (BAH wing) is steady rolling and lateral stability derivatives are determined. In the second example (HA21D), lateral-directional stability derivatives are calculated for forward- swept-wing (FSW) airplane in antisymmetric quasi-steady maneuvers. Acceptable agreement is achieved comparing the results from [4] and DERIV.
DOI : 10.2298/TAM0604311M
Keywords: aerodynamics, lateral stability derivatives, directional stability derivatives 
N. L. Maričić. Numerical estimation of aircrafts' unsteady lateral-directional stability derivatives. Theoretical and applied mechanics, Tome 33 (2006) no. 4, p. 311 . doi: 10.2298/TAM0604311M
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     title = {Numerical estimation of aircrafts' unsteady lateral-directional stability derivatives},
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