Identification of a Nonlinear Wing Structure Using an Extended Modal Model

Mike Platten, Jan Wright, Greg Dimitriadis, Jonathan E Cooper

Research output: Contribution to journalArticle (Academic Journal)

30 Citations (Scopus)

Abstract

The nonlinear resonant decay method identifies a nonlinear dynamic system using a model based in linear modal
space comprising the underlying linear system and a small number of additional terms that represent the nonlinear
behavior. In this work, the method is applied to an aircraftlike wing/store/pylon experimental structure that consists
of a rectangular wing with two stores suspended beneath it by means of nonlinear pylons with a nominally hardening
characteristic in the store rotation degree of freedom. The nonlinear resonant decay method is applied to the system
using multishaker excitation. The resulting identified mathematical model features five modes, two of which are
strongly nonlinear, one is mildly nonlinear, and two are completely linear. The restoring force surfaces obtained
from the mathematical model are in close agreement with those measured from the system. This experimental
application of the nonlinear resonant decay method indicates that the method could be suitable for the identification
of nonlinear models of aircraft in ground vibration testing
Original languageEnglish
Pages (from-to)1614 - 1626
JournalJournal of Aircraft
Volume46
Issue number5
DOIs
Publication statusPublished - Sep 2009

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