Instructions for Authors - Facultatea de Mecanica Craiova ...
Instructions for Authors - Facultatea de Mecanica Craiova ...
Instructions for Authors - Facultatea de Mecanica Craiova ...
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SMAT2008M37EFFECT OF STIFFNESS UNCERTAINTIES ON THE AEROELASTICSTRUCTURESStefan C. Castravete and Raouf A. IbrahimAbstract: This paper <strong>de</strong>als with the investigation of the influence of span-wise distribution of bendingand torsion stiffness uncertainties on the flutter behavior of an aeroelastic wing using a stochastic finiteelement approach. The analysis adopted a numerical algorithm to simulate unsteady, nonlinear,incompressible flow (based on the unsteady vortex lattice method) interacting with linear aeroelasticstructure in the absence of uncertainties. The air flow and wing structure are treated as elements of asingle dynamical system. Parameter uncertainties are represented by a truncated Karhunen-Loveexpansion. Both perturbation technique and Monte Carlo simulation are used to establish the boundaryof stiffness uncertainty level at which the wing exhibits flutter in the <strong>for</strong>m of limit-cycle oscillations (LCO)and above which the wing experiences dynamic instability. The analysis also inclu<strong>de</strong>s the limitation ofperturbation solution <strong>for</strong> a relatively large level of stiffness uncertainty.Keywords: Flutter, vortex-lattice method, aeroelasticity, fluid-structure interaction, perturbationmethod, uncertainty.Stefan C. Castravete, Ph.D., Vice-Presi<strong>de</strong>nt, Caelynx Europe, stefan@caelynx.com, Office Phone +40351801180.Raouf A. Ibrahim, Ph.D., Professor, Department of Mechanical Engineering, MI 48202, ibrahim@eng.wayne.eduSMAT2008M38MATHEMATICA - PACKAGES FOR PLANAR KINEMATIC CHAINSNicolae Craciunoiu, Nicolae Dumitru, Dan B. Marghitu, Filip G. CiolacuABSTRACT: In this paper, the analysis of planar mechanisms with dyads is studied using Mathematica. First aclassification of dyads is introduced and then Mathematica packages <strong>for</strong> driver link and dyads are explained. Theanalysis provi<strong>de</strong>s a consistent coding scheme <strong>for</strong> planar mechanisms. The advantage of the classification of a systemlies in its simplicity. The solution of the whole system can then be obtained by composing partial solutions. Thisapproach will eliminate the need of storing complete mechanism in<strong>for</strong>mation in a large database.Keywords:Mathematica,kinematicchains,dyadsNicolae Craciunoiu, Faculty of Mechanics, University of <strong>Craiova</strong>, Calea Bucuresti, Str., 107,ncraciunoiu@yahoo.com.Nicolae Dumitru, Faculty of Mechanics, University of <strong>Craiova</strong>, Calea Bucuresti, Str., 107,nicolae_dtru@yahoo.com.Dan B. Marghitu, Mechanical Engineering Department, Auburn University, AL 36849,USA, marghitu@eng.auburn.edu.Filip G. Ciolacu, Faculty of Mechanics, University of <strong>Craiova</strong>, Calea Bucuresti, Str., 107,fciolacu47@yahoo.com73
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