Date of download: 7/12/2017
Copyright © ASME. All rights reserved.
From: Modeling of Cross-Coupling Responses on Hingeless Helicopters via Gyroscopic Effect
J. Comput. Nonlinear Dynam. 2012;7(2):024501-024501-9. doi:10.1115/1.4005473
Figure Legend:
The direct measurements of the cyclic pitch angle. (a) The actual variation of the cyclic pitch angle on the main blades in a
revolution. It can be measured directly from the blades. The rotation angle ψR is defined positively around the z-axis of the body
frame. This variation cannot be intuitively understood because, for example, to roll left, more lift should be generated on the right
hand side of the hub plane instead of the front side. (b) The compensated variation of the cyclic pitch angle after going through a
conventional phase-lag treatment, which can be found in the previous work. Such that the cyclic pitch angles are added by a 90° as
a phase-lag. It then becomes intuitively understandable because, for example, to roll left (blue solid line), more lift is generated on
the right side of the hub plane.