Linearized stability analysis methodologies that are applicable to general nonlinear rotorcraft problems are presented in this paper. Two classes of closely related algorithms, based on a partial Floquet and an autoregressive approach, are presented in a common framework that underlines their similarity and their relationship to other methods. The robustness of the proposed approach is improved by using optimized signals that are derived from the proper orthogonal modes of the system. Finally, a signal synthesis procedure based on the identified frequencies and damping rates is shown to be an important tool for assessing the accuracy of the identified parameters; furthermore, it provides a means of resolving the frequency indeterminacy associated with the eigenvalues of the transition matrix for periodic systems. The proposed approaches are computationally inexpensive and consist of purely postprocessing steps, which can be used with any comprehensive aeroelastic rotorcraft code or with experimental data. Unlike classical stability analysis methodologies, they do not require the linearization of the equations of motion of the system.
Efficient and robust approaches for rotorcraft stability analysis
Effiziente und robuste Ansätze für die Stabilitätsanalyse von Drehflüglern
Journal of the American Helicopter Society ; 55 , 3 ; 032006/1-032006/9
2010
9 Seiten, 5 Bilder, 2 Tabellen, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
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