US 11,731,757 B2
Rotor blade pitch trajectory control
Thomas Karl Berger, Winchester, CA (US); David Wade Milanes, Ann Arbor, MI (US); and James Stewart Robertson, Murrieta, CA (US)
Filed by Karem Aircraft, Inc., Lake Forest, CA (US)
Filed on Nov. 5, 2021, as Appl. No. 17/520,424.
Prior Publication US 2023/0142439 A1, May 11, 2023
Int. Cl. B64C 27/615 (2006.01); B64C 27/72 (2006.01); B64C 27/57 (2006.01)
CPC B64C 27/615 (2013.01) [B64C 27/57 (2013.01); B64C 27/72 (2013.01); B64C 2027/7205 (2013.01)] 13 Claims
OG exemplary drawing
 
10. A method of reducing vibration, or optimizing another parameter, in a rotorcraft having a rotor assembly with at least first and second rotor blades, comprising:
using individual blade control (IBC) to control blade pitches of the first blade in a current rotation based upon of at least one of a pitch velocity, a pitch acceleration, and a past pitch jerk of the first blade during a previous rotation;
using individual blade control (IBC) to control blade pitches of the second blade in the current rotation based upon of at least one of a pitch velocity, a pitch acceleration, and a past pitch jerk of the second blade during the previous rotation;
providing feedback with respect to operation of at least the first blade in the current rotation; and
utilizing the feedback to control blade trajectories of at least the first blade in a still later rotation.