Reference : Prediction of maximum loads due to turbulent gusts using nonlinear system identification
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Engineering, computing & technology : Aerospace & aeronautics engineering
Prediction of maximum loads due to turbulent gusts using nonlinear system identification
Dimitriadis, Grigorios mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Cooper, J. E. [ > > ]
Proceedings of the 1997 International Forum on Aeroelasticity and Structural Dynamics
Tipografia ESAGRAFICA s.r.l.
International Forum on Aeroelasticity and Structural Dynamics, IFASD 1997
du 17 juin 1997 au 20 juin 1997
CEAS Council of European Aerospace Societies
[en] Gust loads ; Nonlinear Aeroelastic Systems ; Nonlinear System Identification ; NARMAX ; Restoring Force Surface ; Matched Filter Theory
[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.
Researchers ; Professionals

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