A method and system for controlling transitions between attitude command/response and rate command/response in an aircraft control system wherein the transfer function for a generic second order system is developed at current operating conditions and a predetermined constant damping. During a transition, trim follow-up frequency is changed progressively to coincide with the desired bandwidth, thereby effecting a pole-zero cancellation and converting the transfer function to that of a rate command/response system. Actuators, responsive to signals produced by the control, change aircraft parameters by altering the position of the main rotor and tail rotor control system in accordance with pilot input signals.
A flight control device for an aircraft, in particular for a helicopter, includes, in addition to a control member and an actuator of a controlled member, a determination unit for determining a control command which corresponds to a translational rate control command, dependent on the deflection of the control member, while the translational rate of the aircraft is less than a reference value and which corresponds otherwise to a translational acceleration or angular rate control command, dependent on an extra deflection of the control member.
The present invention relates to a flight control device for an aircraft comprising a control (2) and a means for actuating a controlled member (RP, RQ) to which a command is applied. According to the invention, said device (1) additionally includes a sensor (E) for determining a second value that is representative of the control executed by the aircraft (He) with respect to the control axis, and second means (M2) which determine: as long as the second value is lower than or equal to a reference value, a first trim command that is proportional to the actuation of the control (2); and when the second value is higher than the reference value, in addition to a second trim command, a speed command that is proportional to the additional actuation over and above said second value.
The present invention relates to an arrangement and a method in a mechanical control system of an aircraft. From the cockpit of the aircraft control surfaces (1) of the aircraft can be acted upon via the control system by means of at least one control element (3), for example a wheel, a control column or a pair of pedals operatively connected to the control system. A servomotor (5) together with sensors is also connected to the control system. The sensors are designed, when acted upon by the control element (3), to detect the torque exerted on the control element (3) by a force applied thereto, the trim angle of the control element and the angular velocity with which the action occurs. The arrangement comprises a control device (9) which, on the basis of the conditions detected by the sensors, is designed to control the servomotor (5) so that a ratio between the force applied to the control element (3) and the trim angle of the control element assumes a desired, essentially constant value.
