Flutter Characteristics of an Adaptive Wing Having Camber Change and Free Play Nonlinearity

Ünlüsoy, Levent
Yaman, Yavuz
AIAC2013, 7th Ankara International Aerospace Conference (11 - 13 Eylül 2013)


Flutter Optimization of a Wing-Engine System with Passive and Active Control Approaches
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In the present study, the flutter performance of a composite thin-walled beam wing-engine system is optimized by implementing two different control approaches: 1) passive open-loop and 2) active closed-loop control. Sequential quadratic programming and genetic algorithm methods are applied in the optimization process. In the passive control method, variable stiffness is acquired by constructing laminates of thin-walled beam with curvilinear fibers having prescribed paths. The goal is to exploit the desirabl...
Flutter analysis of fixed and rotary wings
Çiçek, Orhun; Kayran, Altan; Department of Aerospace Engineering (2019)
Flutter is a critical stability problem that needs to be considered for the design of fixed and rotary wings. Although flutter susceptibility is addressed during the test phases of the most of the aircraft, an analytical model is required for the determination of flutter boundaries and most importantly for supplying feedback to the design procedure in order to have a structure that is free from flutter. In this thesis, several flutter analysis methodologies are investigated for both fixed and rotary wing st...
Flutter characteristics of plate like structures
Dalmış, Mevlüt Burak; Yazıcıoğlu, Yiğit; Durak, Burak; Department of Mechanical Engineering (2014)
In this study, flutter characteristics of plate like structures in incompressible flow are investigated by comparing the results of commercial flutter analysis program ZAERO© with wind tunnel tests conducted in Ankara Wind Tunnel (ART). Firstly, a rectangular polycarbonate (PC) plate, 5x125x1000 mm in dimensions, is investigated. In this case, analysis and test results are in good agreement with each other. Second test item is a 1/10 scaled F-16 wing like PC plate. In this case, the plate is capable of carr...
Flutter study of flapwise bend-twist coupled composite wind turbine blades
Farsadi, Touraj; Kayran, Altan (2021-03-01)
Bending-twisting coupling induced in big composite wind turbine blades is one of the passive control mechanisms which is exploited to mitigate loads incurred due to deformation of the blades. In the present study, flutter characteristics of bend-twist coupled blades, designed for load alleviation in wind turbine systems, are investigated by time-domain analysis. For this purpose, a baseline full GFRP blade, a bend-twist coupled full GFRP blade, and a hybrid GFRP and CFRP bend-twist coupled blade is designed...
Flutter qualification of transport aircraft with store suspension
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The methodology backed by relevant analysis results, flutter flight test (FFT) results, and their interpretation is presented for the flutter qualification of a transport aircraft with wing mounted external store suspension. Before the flight tests, extensive flutter analyses are performed by MSC/Nastran for different weight and CG configurations to reduce the number of costly FFTs based on the results of flutter analysis and decide on the aircraft test configurations. Analysis results and test results indi...
Citation Formats
L. Ünlüsoy and Y. Yaman, “Flutter Characteristics of an Adaptive Wing Having Camber Change and Free Play Nonlinearity,” presented at the AIAC2013, 7th Ankara International Aerospace Conference (11 - 13 Eylül 2013), Ankara, Türkiye, 2013, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/74243.