Advances in Flight Flutter Testing Techniques: Incorporating statistical confidence bounds and online stability indication approaches into a flight flutter test - Couverture souple

Abbasi, Asim

 
9783844330786: Advances in Flight Flutter Testing Techniques: Incorporating statistical confidence bounds and online stability indication approaches into a flight flutter test
Couverture souple
ISBN 10 : 384433078X ISBN 13 : 9783844330786
Editeur : LAP LAMBERT Academic Publishing, 2011

Synopsis

Flight flutter testing is mandatory for aircraft certification; however it is a risky, lengthy and costly process with ever-growing demand for shorter and cheaper as well as online testing tools. This research has dealt with two key issues and the methods developed have been validated on simulated aeroelastic data sets. Firstly, the flutter boundaries are evaluated using statistical confidence criteria based on Least Squares statistics and eigenvalue perturbation theory rooting from noise statistics in the response data from a single flight test outdoing the need for Monte Carlo simulations or repeated tests. The approach is employed on three different flutter prediction tools: Damping Extrapolation method, Flutter Margin method and Envelope Function method. Results from the first two methods showed widening of the confidence bounds with increasing noise whilst the third method remained robust to it. The other research problem involves the development of an online flutter prediction tool using the Envelope Function method. The original approach is extended by making direct use of the chirp response to predict the flutter speed and is applicable to both offline and online versions.

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Présentation de l'éditeur

Flight flutter testing is mandatory for aircraft certification; however it is a risky, lengthy and costly process with ever-growing demand for shorter and cheaper as well as online testing tools. This research has dealt with two key issues and the methods developed have been validated on simulated aeroelastic data sets. Firstly, the flutter boundaries are evaluated using statistical confidence criteria based on Least Squares statistics and eigenvalue perturbation theory rooting from noise statistics in the response data from a single flight test outdoing the need for Monte Carlo simulations or repeated tests. The approach is employed on three different flutter prediction tools: Damping Extrapolation method, Flutter Margin method and Envelope Function method. Results from the first two methods showed widening of the confidence bounds with increasing noise whilst the third method remained robust to it. The other research problem involves the development of an online flutter prediction tool using the Envelope Function method. The original approach is extended by making direct use of the chirp response to predict the flutter speed and is applicable to both offline and online versions.

Biographie de l'auteur

Dr Abbasi did Bachelors in Mechanical Engineering from University of Engineering and Technology, Taxila, Pakistan in 1999 and PhD in Aeronautical Engineering from University of Manchester, UK in 2009. His main research interests include aeroelastic modelling, flight flutter testing, modal analysis, system identification and structural dynamics.

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Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2011
Langue
anglais
ISBN 10 
384433078X
ISBN 13 
9783844330786
Reliure
Broché
Nombre de pages
248
Coordonnées du fabricant
non disponible
Personne responsable
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