Aeroelastic flutter analysis of supersonic wing with multiple external stores
Flutter may be considered to be one of the most dangerous aeroelastic failure phenomenon. The flutter characteristic differs for each aircraft type, and depends on the wing geometry as well as its operational region of subsonic, transonic or supersonic speeds. Prior to performing a flight flutter...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IIUM Press
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/41701/ http://irep.iium.edu.my/41701/ http://irep.iium.edu.my/41701/1/524-2142-3-PB.pdf |
| Summary: | Flutter may be considered to be one of the most dangerous aeroelastic
failure phenomenon. The flutter characteristic differs for each aircraft type, and depends
on the wing geometry as well as its operational region of subsonic, transonic or
supersonic speeds. Prior to performing a flight flutter test, extensive numerical
simulations and Ground Vibration Tests should be conducted where the structural finite
element modes and the experimentation results should be matched, otherwise the
numerical simulation model must be rejected. In this paper, the analysis of simulation of
a supersonic wing equipped with external missiles loaded on the wing is presented. The
structural mode shapes at each generated frequency are also presented. The analysis is
carried out using MSC Nastran FEM software. The wing flutter with the external stores
was simulated at different altitudes. The result shows that the flutter velocity is sensitive
to the flight altitude. For this reason, the flutter analysis is conducted also for a negative
altitude. The negative altitude is obtained by considering the constant equivalent speed-
Mach number rule at the flutter speed boundary which is a requirement in standard
transport aircraft regulations |
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