A direct numerical time marching integration is used to compute the transient response (free oscillation) of the flap-lag motion of a stalled rotor. A time-domain quasilinear model identification technique is applied to identify the damping and frequency for the regressing mode, except for the chaotic lag response when stall occurs. A numerical example and correlation with the experimental results (Ref ) are provided. It is found that the present theoretical method has improved the flap-lag stability analysis with respect to agreement with experiment compared to earlier theoretical results.
Damping Prediction for Stalled Rotor Flap-Lag Stability With Experimental Correlation
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Tang, D. M., and Dowell, E. H. (November 1, 1995). "Damping Prediction for Stalled Rotor Flap-Lag Stability With Experimental Correlation." ASME. Appl. Mech. Rev. November 1995; 48(11S): S189–S194. https://doi.org/10.1115/1.3005070
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