Aircraft Autobraking Course Trajectory Adjustment
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Solution Overview
Problem
Aircraft autobraking systems often cause aircraft to deviate from a desired course during landing or Rejected Take-Off events due to external factors like wind and imbalanced thrusters, necessitating improved systems to maintain course stability.
Innovation Solution
An aircraft autobraking system comprising an autobrake controller, pedal balance controller, and pedal executive module that calculates and adjusts brake pedal commands based on aircraft acceleration targets, yaw angle, yaw speed, and wheel speed to maintain a steady course, using a combination of left and right wheel control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If autobraking system is engaged to decelerate aircraft, then deceleration performance is improved, but course stability deteriorates due to veering off desired course
Solution Approach 1:
The system continuously monitors aircraft position, yaw rate, and wheel speed, then feeds this information back to the controller which adjusts brake commands in real-time. This closed-loop feedback mechanism allows the system to maintain course stability while achieving effective deceleration by dynamically compensating for deviations caused by wind, ground conditions, and thruster imbalances.
Solution Approach 2:
The system dynamically changes brake application parameters (brake pressure distribution to left and right wheels) based on real-time aircraft state parameters (position, yaw rate, wheel speed). By continuously adjusting these parameters in response to changing conditions, the system maintains both deceleration performance and course stability during autobraking operation.
2Speed
If autobraking system applies brake force to decrease speed, then deceleration effectiveness is improved, but course deviation increases due to external factors like wind and imbalanced thrusters
Solution Approach 1:
The system applies counteracting brake forces to compensate for external disturbing factors. When wind or thruster imbalance causes the aircraft to veer from its desired course, the controller adjusts brake pressure distribution between left and right wheels to create counterbalancing forces that offset the harmful effects, thereby maintaining course stability during deceleration.
Solution Approach 2:
The system converts the potential harm of asymmetric brake forces (which could cause course deviation) into a beneficial control mechanism. By deliberately applying different brake forces to left and right wheels based on real-time feedback, the system uses what could be a source of instability as a means to actively counteract external disturbances and maintain course accuracy during deceleration.
3Device complexity
If traditional autobraking system is used, then system simplicity is maintained, but course maintenance capability during landing is reduced
Solution Approach 1:
The autobraking controller is enhanced to perform multiple functions: it not only controls deceleration by applying brake force but also simultaneously maintains course stability by adjusting brake pressure distribution based on position and yaw rate feedback. This multi-functional approach integrates deceleration control and course keeping into a single unified system, improving reliability without adding separate dedicated systems.
Data Source
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AI summary
Methods and systems are provided for improved autobraking systems for aircraft. Such systems and methods include a pedal balance controller 20 configured to receive one of a yaw angle, a yaw speed, and a wheel speed, and an autobrake pedal executive module 30 configured to send an autobrake left pedal command and an autobrake right pedal command to a pedal executive module 40, wherein the pedal executive module is configured to execute a pedal command. These systems and methods may assist a pilot in maintaining a desired course during autobraking.