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Viscous damping effect on the aeroelastic stability of subsonic wings: Introduction of the U–K method

Beheshtinia, F ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jfluidstructs.2017.05.006
  3. Abstract:
  4. This study aims at introduction of a novel method for evaluating the effect of viscous damping on the aeroelastic stability boundaries. The K-method is well-known for being one of the fastest methods in determining the instability conditions (i.e. critical speed and its corresponding frequency). However, formulation of the K-method is developed for aeroelastic systems without viscous damping and solution is valid where the introduced artificial damping is zero. Taking into account the framework of the K-method in general, this study has tried to remove the major shortcoming of the K-method, i.e. investigation of the effect of viscous damping on the aeroelastic stability boundaries. The aeroelastic feasibility of the introduced method is studied via the analysis of typical sections and subsonic high-aspect ratio wings. Parameter studies provided in the present investigation, indicate that viscous damping may alter the stability conditions significantly. © 2017 Elsevier Ltd
  5. Keywords:
  6. K-method ; Subsonic high aspect ratio wings ; Aspect ratio ; Damping ; Stability ; Aeroelastic stability ; High-aspect ratio wing ; K methods ; Reduced frequency ; Viscous damping ; Aeroelasticity
  7. Source: Journal of Fluids and Structures ; Volume 73 , 2017 , Pages 1-15 ; 08899746 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S0889974616303334