A successive robust flutter prediction technique for aeroelastic systems using µ method

Onkar, AK (2021) A successive robust flutter prediction technique for aeroelastic systems using µ method. Meccanica, 56 (10). pp. 2613-2629. ISSN 00256455

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Official URL: https://link.springer.com/article/10.1007/s11012-0...

Abstract

In this work, a successive robust flutter prediction technique is developed by coupling nominal analysis, ground vibration test, wind tunnel test, uncertainty model updation and robust analysis based on the structured singular value method to predict the worst flutter boundary of a swept back wing in transonic flow regime. Here, uncertainties in both structural and unsteady aerodynamics parameters are considered in the generalized coordinates. These uncertainties are introduced in the nominal aeroelastic system in a linear fractional transformation framework. The magnitudes of structural uncertainties are estimated based on the difference in natural frequencies between ground vibration test and nominal analysis. The magnitudes of aerodynamic uncertainties are estimated using a model updation technique based on the structured singular value method considering the difference in damping values between wind tunnel test and nominal analysis. The capability of the present successive robust flutter prediction technique is investigated by estimating the robust flutter boundary of a swept back wing in transonic flow regime. From the results, it is observed that the uncertainty model updation provides a reasonable estimate of aerodynamic uncertainty magnitude. Further, the present flutter prediction approach gives a good estimate of transonic flutter boundary (transonic dip) by successively updating the aerodynamic uncertainty bounds using wind tunnel data for various set of test Mach numbers.

Item Type: Article
Uncontrolled Keywords: Robust flutter prediction technique, Aeroelastic system, Ground vibration test, Wind tunnel test
Subjects: AERONAUTICS > Aerodynamics
AERONAUTICS > Aircraft Propulsion and Power
AERONAUTICS > Aircraft Stability and Control
ENGINEERING > Structural Mechanics
Depositing User: Mrs. Usha Kumari
Date Deposited: 18 May 2022 13:52
Last Modified: 18 May 2022 13:52
URI: http://nal-ir.nal.res.in/id/eprint/13549

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