Gust loads; Nonlinear Aeroelastic Systems; Nonlinear System Identification; NARMAX; Restoring Force Surface; Matched Filter Theory
Abstract :
[en] Two nonlinear system identification methods, the NARMAX
method and a proposed method based on the Restoring Force Surface method,
were used in conjunction with two gust load prediction methods, the
Matched Filter Based 1-dimensional search and the Deterministic Spectral
procedure - or Matched Filter Based multi-dimensional search - in order
to demonstrate the feasibility of obtaining maximised gust loads using
identified models of nonlinear aeroelastic systems.
The procedure was tried on two different mathematical systems, a simple,
one-degree-of-freedom system with cubic nonlinearity and a model of a
wing with control surface and discontinuous nonlinearities. The maximised
gust loads predicted from the identified systems were very close to the
ones obtained for the actual systems. Furthermore, it was demonstrated
that performing the identification procedure at low excitation levels
does not adversely affect the prediction of the maximised loads and
critical gust profiles.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Dimitriadis, Grigorios ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Cooper, J. E.
Language :
English
Title :
Prediction of maximum loads due to turbulent gusts using nonlinear system identification
Publication date :
June 1997
Event name :
International Forum on Aeroelasticity and Structural Dynamics, IFASD 1997
Event organizer :
CEAS Council of European Aerospace Societies
Event place :
Rome, Italy
Event date :
du 17 juin 1997 au 20 juin 1997
Audience :
International
Main work title :
Proceedings of the 1997 International Forum on Aeroelasticity and Structural Dynamics
