VTOL Fly-By-Wire Control for Intuitive Flight Transitions
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Solution Overview
Problem
Fly-by-wire systems in VTOL aircraft complicate pilot control by requiring different inputs for vertical and forward flight modes, increasing workload and lacking intuitive transitions.
Innovation Solution
A control system that dynamically adjusts a zero acceleration reference position for control sticks based on current aircraft speed, allowing pilots to maintain constant speed by releasing the stick, using a flight control computer to calculate actuation commands for actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If fly-by-wire systems are used to control VTOL aircraft, then automated control and precision are improved, but control complexity and pilot workload increase
Solution Approach 1:
The control system dynamically adapts the stick-to-surface relationship based on aircraft speed and flight mode. The mapping between control input and actuator response changes continuously with flight conditions, providing automated adaptation that reduces pilot workload while maintaining precision control across different flight regimes
Solution Approach 2:
The system changes the control parameters (stick-to-surface mapping) based on flight conditions such as speed and altitude. By dynamically adjusting these parameters, the system maintains optimal control characteristics across different flight modes without requiring manual reconfiguration, thus improving automated control while managing complexity
2Measurement precision
If different control inputs are required for vertical and forward flight modes, then control precision for each mode is improved, but ease of operation deteriorates due to increased pilot workload
Solution Approach 1:
The control system provides dynamic adaptation of the stick-to-surface relationship based on flight mode and speed. This allows the system to maintain precise control for each specific flight mode while automatically managing the transitions, thereby preserving control precision without requiring the pilot to manually adjust control inputs for different modes
Solution Approach 2:
The control system automatically adjusts the control mapping based on flight conditions without pilot intervention. The system serves itself by detecting flight mode and speed, then autonomously reconfiguring the control parameters to maintain precision while reducing pilot workload
3Ease of operation
If traditional fixed stick-to-surface control is used, then ease of operation is maintained, but adaptability to different flight modes deteriorates
Solution Approach 1:
The system transitions from a fixed stick-to-surface relationship to a dynamic one that automatically adapts to different flight modes and speeds. This maintains ease of operation by preserving the familiar control interface while adding adaptability through automated parameter adjustment based on flight conditions
Solution Approach 2:
The control system achieves multi-functionality by using a single adaptive control mapping that serves multiple flight modes (vertical flight, forward flight, transitions). This universal approach maintains ease of operation while providing adaptability across different flight regimes, eliminating the need for separate control systems for each mode
Data Source
AI summary
Fly-by-wire vehicle systems and related control systems are provided for controlling operation of a vehicle, such as an aircraft. An exemplary method of controlling a vehicle involves identifying an input position associated with actuation of a human-machine interface, identifying a current speed of the vehicle, determining a dynamic zero acceleration reference actuation position for the human-machine interface based at least in part on the current speed, determining an acceleration command for the vehicle based on a relationship between the input actuation position and the dynamic zero acceleration reference actuation position, and providing the acceleration command to a flight control law or other control system configurable to operate one or more actuators associated with the vehicle to influence the current speed of the vehicle in accordance with the acceleration command.