Aircraft Takeoff Anomaly Warning Using Acceleration Degradation
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Solution Overview
Problem
Existing systems for generating information, warning, or alarm signals during aircraft takeoff in case of anomalies lack precision in transition timing and require high calculation resources, making it difficult for pilots to decide whether to reject takeoff safely and efficiently.
Innovation Solution
A method implemented through electronic circuitry that calculates the distance and acceleration degradation of an aircraft during takeoff, providing a warning when acceleration degradation exceeds a predefined threshold, using predefined speed thresholds and integrating forces to reduce calculation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If continuous calculation of stopping distance during acceleration phase is performed, then the pilot receives continuous braking margin information, but large calculation resources are required
Solution Approach 1:
The patent divides the takeoff phase into distinct speed segments (below V1, between V1 and VR, above VR) and applies different calculation methods to each segment. This segmentation allows the system to provide continuous braking margin information while reducing calculation resources by using simplified methods in certain phases
Solution Approach 2:
The patent calculates stopping distance continuously but only provides braking margin information when it exceeds a threshold value (when braking margin is positive). This partial action approach reduces information processing load while maintaining safety by focusing on critical situations where rejection is still possible
2Measurement precision
If takeoff rejection decision is made at critical speed V1, then the transition point is clear, but the pilot does not know the exact moment of transition and braking margin
Solution Approach 1:
The patent implements a feedback mechanism that continuously calculates and provides braking margin information to the pilot during takeoff. This feedback allows the pilot to know the exact moment when braking margin becomes zero (the critical transition point) and make informed decisions about takeoff rejection timing
Solution Approach 2:
The patent calculates stopping distance and braking margin in advance during the acceleration phase, before the critical V1 speed is reached. This preliminary calculation allows the pilot to anticipate the transition point and prepare for timely rejection if needed
Data Source
AI summary
A method for monitoring an aircraft during takeoff is initiated when a first speed threshold is reached. During successive calculation cycles, the following steps are implemented: obtaining a current ground speed; calculating a time taken by a numerical aircraft model to increase its speed to the current ground speed; multiplying this time by the current ground speed and, by integration, deducing therefrom the distance theoretically travelled by the aircraft. Furthermore, the following steps are implemented when a second speed threshold is reached: estimating an acceleration degradation based on a difference between the distance actually travelled by the aircraft and the distance theoretically travelled by the aircraft; and generating a warning when the estimate of the acceleration degradation is greater than a degradation threshold.