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COBEM 2021
26th International Congress of Mechanical Engineering
Flutter Stability Analysis of a Plate Like Wing System in the Presence of Parametric Uncertainty
Submission Author:
Marcelo Araújo Delgado Filho , RN
Co-Authors:
Marcelo Araújo Delgado Filho, Antonio Marcos de Lima, Gutembergy Diniz
Presenter: Marcelo Araújo Delgado Filho
doi://10.26678/ABCM.COBEM2021.COB2021-2349
Abstract
When conducting stability analysis of aeroelastic systems, it is relevant to consider possible sources of uncertainty, as they may considerably modify its dynamic behavior. In structural engineering, randomness is present in the geometrical and physical parameters of the system and even in the mathematical model. Regarding a plate-like wing arrangement, thickness variation has considerable potential to change the aeroelastic response. Concomitantly, flutter is one of the most fundamental aeroelastic instabilities. Therefore, this work has attempted to study the effect of thickness variation on the flutter velocity of a cantilevered thin plate. Due to the bi-dimensional nature of the structure, the random thickness is represented by the Karhunen-Loève expansion as a Gaussian random field. The doublet lattice method and the pk method yield the unsteady aerodynamic load and the flutter velocity, respectively. By propagating uncertainty into the equation of motion through Monte Carlo simulation, it is possible to represent the flutter phenomenon more realistically when compared with the deterministic approach. The relevance of including uncertainty in such aeroelastic systems is, thus, demonstrated.
Keywords
Flutter, uncertainty quantification, Parametric uncertainly, Plate-like wing model
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