Damping Prediction for Stalled Rotor Flap-Lag Stability With Experimental Correlation

[+] Author and Article Information
D. M. Tang, E. H. Dowell

Department of Mechanical Engineering, Duke University, Durham NC 27706

Appl. Mech. Rev 48(11S), S189-S194 (Nov 01, 1995) doi:10.1115/1.3005070 History: Online April 29, 2009


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 [4]) 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.

Copyright © 1995 by The American Society of Mechanical Engineers
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