FORCE FIGHT MITIGATION
A force fight mitigation system comprising: control means configured to provide a position command to each of two or more actuators arranged to position a surface, the position command indicative of a desired position of the actuator relative to the surface; means to detect the actual position of the actuator relative to the surface in response to the position command; and means to determine an offset between the desired position and the actual position and to store a rigging correction based on the offset; wherein, for each actuator, an offset is determined for each of three or more desired positions.
1 . A force fight mitigation system comprising: control means configured to provide a position command to each of two or more actuators arranged to position a surface, the position command indicative of a desired position of the actuator relative to the surface; means to detect the actual position of the actuator relative to the surface in response to the position command; and means to determine an offset between the desired position and the actual position and to store a rigging correction based on the offset; wherein, for each actuator, an offset is determined for each of three or more desired positions.
2 . The system of claim 1 , wherein for each actuator, an offset is determined for a neutral position and for a position either side of the neutral position.
3 . The system of claim 2 , wherein the positions either side of the neutral position correspond substantially to two extremes of actuator stroke.
4 . An actuation system comprising two or more actuators arranged to position a surface, and a force-fight mitigation system as defined in claim 1 .
5 . An aircraft surface control assembly comprising a moveable surface and an actuation system as defined in claim 4 .
6 . A method of mitigating force-fighting in an actuation system comprising two or more actuators arranged to position a surface; the method comprising determining an offset between a desired position of the actuator relative to the surface and an actual position of the actuator relative to the surface for each actuator for three or more desired positions.