Dm. Tang et Eh. Dowell, DAMPING PREDICTION FOR HINGELESS ROTOR AEROELASTIC STABILITY WITH EXPERIMENTAL CORRELATION, Journal of aircraft, 33(6), 1996, pp. 1071-1078
A numerical simulation technique is applied to determine the transient
response of a hingeless rotor model and predict the lag damping for c
orrelation with experimental results from a wind-tunnel test. Numerica
l investigations indicate that the present theoretical/numerical metho
d improves somewhat the correlation of the theoretical and experimenta
l results over earlier eigenvalue, perturbation analyses. For a shaft
angle of alpha(s) = 0 and -3 deg, the correlation still is not accepta
ble for the advance ratios, mu > 0 2. In addition to a steady inflow m
odel, a 3 x 3 dynamic inflow model is also used in the present method.
The results with this dynamic inflow model show some improvement rela
tive to the experimental data, as compared to the uniform inflow model
. For further improvement of the correlation with the experimental dat
a, a highly efficient, accurate aerodynamic model suitable for the rot
or blade aeroelastic stability analysis is required.