Fixed- and Free-Mode Flutter Derivatives During Aeroelastic Optimization

Aeroelastic flutter design derivatives may be approximated by ignoring the sensitivity of the structural mode shapes. This fixed-mode derivative is less expensive to compute than the exact free-mode derivative (which accommodates the mode shape dependency) but also may provide inaccurate sensitiviti...

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Veröffentlicht in:AIAA journal 2024-12, Vol.62 (12), p.4645-4653
Hauptverfasser: Stanford, Bret K., Thelen, Andrew S., Jacobson, Kevin E.
Format: Artikel
Sprache:eng
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Zusammenfassung:Aeroelastic flutter design derivatives may be approximated by ignoring the sensitivity of the structural mode shapes. This fixed-mode derivative is less expensive to compute than the exact free-mode derivative (which accommodates the mode shape dependency) but also may provide inaccurate sensitivities for optimization. This work formulates both fixed- and free-mode flutter derivatives and demonstrates the conditions under which they are equivalent. Two different types of fixed-mode derivatives are also developed in this work. Using a cantilevered-plate demonstration problem with both shape and sizing design parameters, the accuracy of the free-mode derivative and the two fixed-mode derivatives is demonstrated via gradient-based optimization.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J064166