METHOD OF DRIVING A MAIN ROTOR OF A ROTORCRAFT IN THE CONTEXT OF SIMULATING A FAILURE OF ONE OF THE ENGINES OF THE ROTORCRAFT

摘要

A method of driving a main rotor of a rotorcraft in rotation while implementing an in-flight simulation mode that simulates failure of one of the engines of the rotorcraft. In simulation mode, and when a current speed of rotation (NR) of the main rotor is detected as being lower than a predetermined threshold speed of rotation (S), the simulation mode is kept active and a regulation command is generated in order to perform a controlled operation (A) of gradually increasing the power delivered by the engines by authorizing the limit imposed by a setpoint (OEI/2) for regulating operation of the engine in simulation mode to be exceeded. Said gradually increasing power is interrupted by the pilot staying under training and operating a collective pitch manoeuver of the blade of the main rotor providing a rotation of main rotor at the predetermined threshold speed in rotation.

主权项

1. A method of driving rotation of at least one main rotor of a rotorcraft fitted with a power plant comprising a plurality of engines, the method implementing an in-flight simulation mode that simulates failure of one of the engines of the rotorcraft in order to train a pilot of the rotorcraft for such a failure, in which simulation mode:
at least two engines together deliver power in order to drive the main rotor at a setpoint speed of rotation, said power being shared evenly between the engines, that are all kept in synchronous engagement on a power transmission train interposed between the power plant and the main rotor; each of said at least two engines operating on the basis of a first setpoint that is predefined depending on a value of a second setpoint selected by a trainer from a plurality of second setpoints, each second setpoint defining a power that the engines are authorized to deliver for a given period when not in simulation mode in the event of a real failure of an engine, the first setpoint value corresponding to the second setpoint value that defines it being shared evenly between the engines that are all kept in synchronous engagement on said power transmission train in order to drive the main rotor in rotation in simulation mode; and a current speed of rotation of the main rotor detected as being lower than a predetermined threshold speed of rotation, spontaneously giving rise to an operation being performed whereby the engines deliver additional power within a limit imposed by a third setpoint; wherein said operation of delivering additional power is performed by actively maintaining the simulation mode and by generating a regulation command giving rise to a controlled operation of gradually increasing the power delivered by the engines by authorizing the limit imposed by the first setpoint to be exceeded, said operation of gradually increasing the power being interrupted at a current power level at which the power delivered by the engines drives the main rotor at a speed of rotation that is greater than or equal to the predetermined threshold speed of rotation as a consequence of the pilot under training in simulation mode causing blades of the main rotor to perform a collective pitch maneuver.