Article ID Journal Published Year Pages File Type
293291 Journal of Wind Engineering and Industrial Aerodynamics 2008 13 Pages PDF
Abstract

The branch switch characteristics of coupled flutter are clarified by use of Step-by-Step flutter analysis. In the case of typical coupled flutter instability, the branch switch characteristic from torsional branch to heaving branch is observed. In this paper, a revised step-by-step analysis method is proposed and new strategies for flutter control are investigated. The branch switching phenomena for the coupled flutter is confirmed through step-by-step analysis and wind tunnel tests for fundamental structural sections. However, small numerical differences exist between solutions of complex eigenvalue analysis and step-by-step analysis. Therefore, step-by-step analysis is revised considering the logarithmic damping characteristics in the process and the results of revised step-by-step analysis show completely good agreement with those of complex eigenvalue analysis. Furthermore, the torsional divergence instability can be well explained by revised step-by-step analysis. Also, a definitely important role of coupled aerodynamic derivatives A1* and H3* in coupled flutter stabilization is clarified. Finally, considering the mutual relation of aerodynamic derivatives, the fact is clarified that A1* is the most important aerodynamic derivative to stabilize the coupled flutter instability.

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