Aircraft Wind Compensation Control for Low-Speed Maneuvers
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Solution Overview
Problem
Existing aircraft systems lack precise control during low-speed maneuvers due to uncertainties in wind conditions, leading to degraded performance and controllability, particularly in rotorcraft and VTOL aircraft.
Innovation Solution
An automatic low-speed aircraft maneuver wind compensation system that utilizes a flight control computer to compute two-dimensional relative horizontal airspeed by combining steady wind data and groundspeed data, adjusting trim controls and applying these changes through flight element control actuators, while accounting for wind gusts using feedback loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilots manually compensate for wind during low-speed maneuvers, then controllability is maintained through pilot knowledge and experience, but precision of maneuvers degrades due to inaccurate wind data and reactive control approach
Solution Approach 1:
The system performs preliminary wind compensation calculations before maneuvers are executed. The flight control computer continuously computes feedforward trim control adjustments based on predicted wind effects, preparing compensation signals in advance rather than reacting after disturbances occur. This proactive approach maintains both controllability and precision.
Solution Approach 2:
The system implements feedback loops that continuously monitor actual wind conditions, aircraft state, and maneuver performance. This feedback is used to refine wind compensation calculations and adjust trim controls in real-time, transforming the previously open-loop manual compensation into a closed-loop automated system that maintains precision while improving reliability.
2Ease of operation
If reactive disturbance rejection is used to compensate for wind, then controllability is maintained through pilot input, but maneuver precision degrades due to the reactive rather than proactive approach
Solution Approach 1:
The flight control computer calculates feedforward trim control adjustments based on predicted wind effects before maneuvers are executed. This preliminary computation of compensation signals allows the system to proactively counteract wind disturbances, maintaining precision while preserving ease of operation through automated control.
Solution Approach 2:
The system dynamically switches between feedforward and feedback control modes depending on flight conditions and maneuver type. During steady-state low-speed maneuvers, feedforward control provides precise wind compensation, while feedback control handles transient disturbances, creating a dynamic control system that optimizes both responsiveness and precision.
3Extent of automation
If automated control systems reject disturbances reactively, then ease of operation improves through automation, but maneuver precision degrades due to lack of accurate wind information
Solution Approach 1:
The automated flight control system incorporates feedback loops that continuously monitor wind conditions, aircraft state, and maneuver performance. This feedback enables the automated system to accurately assess actual wind effects and adjust trim controls precisely, maintaining hover precision while preserving the benefits of automation. The feedback transforms the automated system from blindly reactive to intelligently responsive.
Solution Approach 2:
The automated flight control computer performs preliminary calculations of wind compensation adjustments based on predicted wind effects and desired maneuver parameters. This feedforward computation allows the automated system to proactively apply precise trim control adjustments, maintaining hover precision while preserving automation benefits without relying on reactive disturbance rejection.
Data Source
AI summary
Automatic low-speed aircraft maneuver wind compensation is implemented by an aircraft flight control system flight control computer (FCC) configured to receive or retrieve steady wind data and retrieve groundspeed data for the aircraft. The FCC computes two-dimensional relative horizontal airspeed (i.e., horizontal relative to the surface of the earth) for the aircraft, using the steady wind data and the groundspeed data for the aircraft, and computes relative changes in trim controls of the aircraft using the two-dimensional relative horizontal airspeed of the aircraft. The resulting relative changes in controls of the aircraft due to relative horizontal airspeed changes are applied to flight element control actuators.