Dynamic Flight Command Cross-Feed for Rotor Speed Droop
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Solution Overview
Problem
Aggressive and transient aircraft maneuvers cause significant rotor speed droop due to sudden power burdens on the engine or electric motor, which existing systems struggle to prevent or reduce effectively.
Innovation Solution
A system comprising a Cross-Feed unit that determines and provides the necessary amount of fuel to the aircraft's motor to execute flight commands, using a coupled aircraft/motor dynamic model to calculate the required fuel flow and torque response, thereby reducing rotor speed droop during various maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If aggressive and transient aircraft maneuvers are executed, then flight performance and maneuverability are improved, but rotor speed droop increases significantly
Solution Approach 1:
The cross-feed unit calculates and provides the necessary fuel amount to the motor before the rotor speed droop occurs during aggressive maneuvers. By determining the required fuel amount in advance based on the flight command and coupled aircraft/motor dynamic model, the system preemptively compensates for the power burden, maintaining rotor speed stability while enabling high-performance maneuvers.
2Stability of the object's composition
If existing engine control systems regulate engine speed for small changes in aircraft state, then rotor speed droop is prevented or reduced, but the system cannot effectively handle sudden power burdens from aggressive maneuvers
Solution Approach 1:
The system transitions from static engine control regulation to dynamic fuel compensation. The cross-feed unit continuously calculates the necessary fuel amount based on real-time flight commands and the coupled aircraft/motor dynamic model, adjusting fuel delivery dynamically to match the varying power demands of different maneuver types, from small state changes to aggressive transient maneuvers.
Solution Approach 2:
The system uses feedback from the flight command and coupled aircraft/motor dynamic model to determine the necessary fuel amount. The cross-feed unit receives flight commands, processes them through the dynamic model to calculate required fuel compensation, and provides this fuel to the motor, creating a closed-loop control system that adapts to different maneuver conditions.
3Stability of the object's composition
If more fuel is provided to the motor during aggressive maneuvers, then rotor speed droop is reduced, but fuel consumption and energy management complexity increase
Solution Approach 1:
The system changes the fuel delivery parameter dynamically based on the specific maneuver conditions. The cross-feed unit calculates the precise necessary fuel amount required to compensate for rotor speed droop during each flight command, adjusting the fuel parameter optimally for each maneuver type rather than using fixed or excessive fuel delivery, thereby maintaining rotor speed stability while managing fuel consumption efficiently.
Data Source
AI summary
An aircraft and method of flying an aircraft are disclosed. The aircraft includes a cross-feed unit that receives a flight command for the aircraft and determines an amount of fuel for a motor of the aircraft in order to reduce a droop in the aircraft when executing the flight command at the aircraft. A fuel injector or fuel supplier provides the determined amount of fuel to the motor when the flight command is executed at the aircraft.