Phenomenology of Nonlinear Aeroelastic Responses of Highly Deformable Joined-wings Configurations

Rauno Cavallaro, Andrea Iannelli, Luciano Demasi, Alan M. Razón

Research output: Contribution to conferenceConference Paperpeer-review

Abstract

Dynamic aeroelastic behaviours of structurally nonlinear Joined Wings are presented.
Three configurations, two characterized by a different location of the joint and one presenting
a direct connection between the two wings (Sensorcraft-like) are investigated.
As a first step, the snap-divergence occurrence is studied from a dynamic perspective
in order to assess the real response of the configuration. Later on, the analyses focus on
the flutter occurrence (critical state) and go further in analyzing postcritical phenomena:
Limit Cycle Oscillations (LCO) are observed, followed by period doubling.
Differences between flutter (Hopf’s bifurcation) speed evaluated with linear and nonlinear
analyses are discussed in depth, in order to understand if a less computationally intense
approach as the linear one may be used with confidence.
Both frequency and time-domain approaches are compared. Moreover, aerodynamic
solvers based on the potential flow are critically examined and discussed. In particular, it is
assessed in what measure the use of more sophisticated (and time-consuming) aerodynamic
modelling impacts the results and also the performances. These differences range from the
methods adopted for load transferring to the models employed to describe the wake.
When the use of the tools gives different results, a physical interpretation of the leading
mechanism generating the mismatch is given. In particular, for PrandtlPlane-like configurations
the stagger of the wings makes the aerodynamic forces be very sensitive to the
wake’s shape. As a consequence, it is suggested that a more sophisticated modelling of the
wake positively impacts the reliability of aerodynamic and aeroelastic analysis.
Original languageEnglish
DOIs
Publication statusPublished - Jan 2014
Event55th AIAA/ASMe/ASCE/AHS/SC Structures, Structural Dynamics, and Materials Conference - SciTech Forum and Exposition 2014 - National Harbor, MD, United States
Duration: 13 Jan 201417 Jan 2014

Conference

Conference55th AIAA/ASMe/ASCE/AHS/SC Structures, Structural Dynamics, and Materials Conference - SciTech Forum and Exposition 2014
Country/TerritoryUnited States
CityNational Harbor, MD
Period13/01/1417/01/14

Keywords

  • Bifurcation
  • LCOs
  • Flutter
  • Aeroelastic Codes

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