Proprotor flapping control systems for tiltrotor aircraft

A tiltrotor aircraft comprising:

• a fuselage;
• a wing coupled to the fuselage;
• at least one propulsion assembly coupled to the wing, the at least one propulsion assembly each including a proprotor assembly;
• one or more sensors operable to detect one or more flight parameters of the tiltrotor aircraft to form sensor data, the one or more sensors including a proprotor flapping sensor operable to detect a proprotor flapping measurement;
• and
• a flight control computer including a flapping control module in data communication with the one or more sensors, the flapping control module including a maneuver detection module operable to detect whether the tiltrotor aircraft is in a maneuver mode using the sensor data, the flapping control module operable to identify a maneuver flapping threshold associated with the maneuver mode;
• wherein the flapping control module is further operable to generate a swashplate command using the proprotor flapping measurement and the maneuver flapping threshold and send the swashplate command to the proprotor assembly to reduce flapping of the proprotor assembly.

A method for controlling flapping of a proprotor assembly of a tiltrotor aircraft comprising:

• receiving a proprotor flapping measurement from a proprotor flapping sensor;
• identifying a maneuver flapping threshold in response to detecting that the tiltrotor aircraft is in a maneuver mode;
• determining a flapping error using the proprotor flapping measurement and the maneuver flapping threshold;
• determining a swashplate command using the flapping error;
• and
• sending the swashplate command to the proprotor assembly to reduce flapping of the proprotor assembly.