Robust Aeroelastic Analysis in the Laplace Domain: The μ-p Method
2007 (English)In: IFASD 2007: International Forum on Aeroelasticity and Structural Dynamics, 2007Conference paper (Other academic)
In this work the so-called μ-k method for robust flutter analysis is generalized to theLaplace domain. Although the generalization as such is a straightforward matter, the resultingμ-p method is far more versatile than the previous formulation. With the new method, a singlestructured singular value (or μ) evaluation can be used to determine if a certain eigenvalue p is asolution to the uncertain flutter equation or not. This result makes it possible to compute regionsof feasible eigenvalues in the complex plane, as well as extreme eigenvalues that can be used topredict damping bounds and perform robust flutter analysis. The capability to predict dampingbounds at any flight condition is a very attractive feature of the μ-p method, as flight testing israrely taken to the flutter point. This feature also makes it possible to estimate the magnitude ofthe uncertainty based on the measured frequency and/or damping of a particular mode, whichcan reduce the potential conservativeness of the robust analysis. Finally, the capabilities of thenew method is demonstrated by applying it to a low-speed wind tunnel model.
Place, publisher, year, edition, pages
Robust Flutter Analysis, Laplace Domain, Model Validation, Flight Testing
IdentifiersURN: urn:nbn:se:kth:diva-77677OAI: oai:DiVA.org:kth-77677DiVA: diva2:491937
International Forum on Aeroelasticity and Structural Dynamics (IFASD) 2007. Stockholm, Sweden. 18-20 June, 2007
QC 201205222012-02-072012-02-072012-05-22Bibliographically approved