Aircraft Emergency Braking Control for Runway-Adaptive Force Limits
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Solution Overview
Problem
Aircraft braking systems in emergency modes lack flexibility in adjusting maximum braking levels based on aircraft and runway conditions, leading to potential issues like tyre skidding and bursts due to inconsistent force management.
Innovation Solution
An aircraft system with a controller that determines a maximum braking level based on criteria indicative of aircraft conditions or runway conditions, allowing for a continuous spectrum of braking levels to mitigate these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single maximum braking level is applied in emergency mode irrespective of conditions, then the braking system is simple to operate, but it causes tyre skidding and bursts due to inconsistent force management
Solution Approach 1:
The braking system dynamically adjusts the maximum braking level based on real-time aircraft conditions (weight, centre of gravity position, runway friction coefficient) rather than applying a fixed braking level. This dynamic adaptation allows the system to optimize braking force for each specific situation, preventing tyre skidding and bursts while maintaining ease of operation through automated control.
Solution Approach 2:
The system changes the braking parameter (maximum braking level) based on varying operational conditions. By calculating and adjusting the braking level according to aircraft weight, centre of gravity position, and runway friction coefficient, the system adapts the braking force to match actual conditions, eliminating the harmful effects of inconsistent force management.
2Object-affected harmful factors
If the braking level is dynamically adjusted based on aircraft and runway conditions, then tyre skidding and bursts are reduced, but the system complexity increases
Solution Approach 1:
The braking system incorporates feedback mechanisms by continuously monitoring aircraft conditions (weight, centre of gravity position) and runway conditions (friction coefficient), then using this information to automatically adjust the maximum braking level. This closed-loop control approach manages system complexity through automated decision-making algorithms that calculate optimal braking levels based on input parameters.
Solution Approach 2:
The braking system performs self-adjustment by automatically calculating and applying the appropriate braking level without requiring manual intervention from the pilot. The controller autonomously processes input data regarding aircraft and runway conditions, determines the optimal braking level, and executes the braking command, thereby managing complexity through self-service operation.
3Reliability
If a fixed maximum braking level is used in emergency mode, then the system is reliable and simple, but it lacks adaptability to different aircraft and runway conditions
Solution Approach 1:
The system changes the braking parameter based on specific operational conditions by calculating the maximum braking level from input data regarding aircraft weight, centre of gravity position, and runway friction coefficient. This parameter adaptation maintains reliability through structured calculation methods while achieving versatility across different aircraft configurations and runway conditions.
Data Source
AI summary
An aircraft system for an aircraft having a controller configured to determine, based on a criterion indicative of an aircraft condition or a runway condition, a maximum braking level able to be applied to a brake of the aircraft in an emergency braking mode, wherein the maximum braking level is determined to be a first maximum braking level when a value of the criterion is above a pre-determined threshold and a second maximum braking level when a value of the criterion is no greater than the pre-determined threshold.