Yaw damping system and method for aircraft

摘要

An alternative system for damping the dutch roll mode in an aircraft is provided using roll control surfaces. Classical yaw dampers for the dutch roll mode utilize the yaw control surfaces such as a rudder to dampen the dutch roll mode oscillations. An alternative damper is described that utilizes roll control surfaces such as spoilers or ailerons to dampen the dutch roll mode.

主权项

1. A method for damping the dutch roll mode in an aircraft having a roll control surface, comprising the steps of:
measuring at least one parameter of the motion of the aircraft; applying a washout filter to the at least one parameter of motion to remove low frequency signals from the measured parameter of motion of the aircraft; calculating a damping signal that is proportional to the at least one parameter of the motion of the aircraft as modified by the washout filter; and actuating the roll control surface in proportion to the damping signal wherein the step of applying a washout filter to the at least one parameter of motion further comprises the step of selecting a natural frequency for the washout filter that is higher than the natural frequency of the spiral mode of the aircraft and lower than the natural frequency of the dutch roll mode of the aircraft.