Control surface freeplay effects investigation on airfoil's aero-elastic behavior in the sub-sonic regime

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dc.contributor.authorJafari, Soheil
dc.contributor.authorFeizarefi, Morteza
dc.contributor.authorPishkenari, Mohsen Majidi
dc.date.accessioned2019-10-29T16:38:38Z
dc.date.available2019-10-29T16:38:38Z
dc.date.issued2019-10-21
dc.description.abstractOne of the main limitations of linearity assumptions in airfoil’s aero-elastic problems is the inability to predict the system behavior after starting the instability. In reality, nonlinearities may prevent the amplitudes from going to infinity. This paper presents a methodological approach for predicting airfoil aero-elastic behavior to investigate the control surface freeplay effects on the state responses and the flutter speed. For this purpose, the airfoil structural model is firstly developed while using the Lagrange’s method. The aerodynamic model is then generated by utilizing the Theodorsen approach for lift and moment calculation and Jones approximation with P-method for unstable aerodynamic modelling. After that, the aero-elastic model is developed by combination of structural and aerodynamic models and a numerical integration method is used to extract the time responses in the state space. The flutter analysis has been completed by utilizing the P-method for the system without freeplay and by the time response approach for the system with freeplay. The results that were obtained from simulations confirm the effectiveness of the proposed method to predict the aero-elastic behavior and stability condition of a two-dimensional airfoil as well as to estimate the flutter speed with reasonable accuracy and low computational effort. Moreover, a sensitivity analysis of freeplay degree on time response results has been done and the results are discussed in detail. It is also showed that the control surface freeplay decreases the flutter speed. The results of the paper are also validated against publicly available data.en_UK
dc.identifier.citationJafari S, Feizarefi M & Majidi Pishkenari M. Control surface freeplay effects investigation on airfoil's aero-elastic behavior in the sub-sonic regime. Aerospace, Volume 6, Issue 10, 2019, Article number 115en_UK
dc.identifier.issn2226-4310
dc.identifier.urihttps://doi.org/10.3390/aerospace6100115
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14647
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectcontrol surface freeplayen_UK
dc.subjectaero-elasticen_UK
dc.subjectTheodorsen methoden_UK
dc.subjectJones approximationen_UK
dc.subjecttwo-dimensional airfoilen_UK
dc.subjectFlutter speeden_UK
dc.subjectcomputational efforten_UK
dc.titleControl surface freeplay effects investigation on airfoil's aero-elastic behavior in the sub-sonic regimeen_UK
dc.typeArticleen_UK

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