Flutter Characteristics of a Morphing Flight Vehicle with Varying Inboard and Outboard Folding Angles

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Morphing aircraft capable of varying their wing form can operate efficiently at various flight conditions. However, radical morphing of the aircraft leads to increased structural complexities, resulting in occurrence of dynamic instabilities such as flutter, which can lead to catastrophic events. Therefore, it is of utmost importance to investigate and understand the changes in flutter characteristics of morphing wings, to ensure uncompromised safety and maximum reliability. In this paper, a study on the flutter characteristics of the folding wing type morphing concept is conducted, to examine the effect of changes in folding angles on the flutter speed and flutter frequency. The subsonic aerodynamic theory Doublet Lattice Method (DLM)and p-k method are used, to perform the flutter analysis in MSC.NASTRAN. The present baseline flutter characteristics correspond well with the results from previous study. Furthermore, enhancement of the flutter characteristics of an aluminum folding wing is proposed, by varying the outboard wing folding angle independently of the inboard wing folding angle. It is clearly found that the flutter characteristics are strongly influenced by changes in the inboard/outboard folding angles, and significant improvement in the flutter characteristics of a folding wing can be achieved, by varying its outboard wing folding angle.
Publisher
The Korean Society for Aeronautical & Space Sciences
Issue Date
2013-06
Language
Korean
Citation

International Journal of Aeronautical and Space Sciences, v.14, no.2, pp.133 - 139

ISSN
2093-274X
URI
http://hdl.handle.net/10203/201592
Appears in Collection
AE-Journal Papers(저널논문)
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