Aircraft Wheel Speed Characteristic Analysis for Dragging Brake Detection
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Solution Overview
Problem
Aircraft brakes may become partially engaged during takeoff due to malfunction, leading to heat generation and potential fire hazards during retraction, as well as preventing the aircraft from reaching takeoff speed, and existing detection methods are inadequate to reliably identify a "dragging" brake.
Innovation Solution
A system comprising sensors and a controller that calculate wheel speed characteristics, determine a moving average, and compare it to a threshold to detect a dragging brake by identifying a lowest value indicative of a dragging brake, generating a signal to alert the presence of such a condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake is partially engaged during takeoff, then the aircraft may be undetectable to the pilot and crew, but heat is generated in the brake and takeoff speed is prevented
Solution Approach 1:
The system performs preliminary detection of brake dragging during takeoff by monitoring wheel speed characteristics before retraction occurs. The controller calculates wheel speed characteristics and compares them to detected values to identify dragging brakes early, allowing preventive action before heat generation becomes hazardous
Solution Approach 2:
The system implements feedback by continuously monitoring wheel speed characteristics and providing real-time detection of brake dragging conditions. The controller receives wheel speed data, processes it through characteristic calculation, and generates alerts when dragging is detected, creating a closed-loop monitoring system that provides continuous feedback on brake status
2Measurement precision
If existing detection methods are used, then the system is simple, but they are inadequate to reliably identify a dragging brake
Solution Approach 1:
The system replaces traditional mechanical or simple electrical detection methods with an electronic control system that processes wheel speed characteristics. The controller uses computational algorithms to analyze wheel speed data and identify dragging conditions, substituting complex electronic processing for simpler but less accurate mechanical detection approaches
Solution Approach 2:
The system detects dragging brakes by monitoring changes in wheel speed characteristics rather than using fixed threshold values. The controller calculates wheel speed characteristics and compares detected values to these characteristics, allowing adaptive detection that accounts for varying operational conditions and improves detection accuracy across different flight scenarios
3Productivity
If a dragging brake is not detected, then retraction can proceed normally, but fire hazard and tire failure risk increase
Solution Approach 1:
The system applies preliminary anti-action by detecting brake dragging conditions before retraction begins and generating alerts to prevent the harmful sequence from occurring. The controller monitors wheel speed characteristics throughout the takeoff roll and provides early warning, allowing the crew to take corrective action before the brake reaches dangerous temperatures that would cause fire or tire failure
Data Source
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AI summary
A landing gear assembly may include a first wheel and a second wheel, a first wheel sensor coupled to the first wheel and a second wheel sensor coupled to the second wheel, and a controller (110) coupled to the first wheel sensor and the second wheel sensor. A tangible, non-transitory memory may have instructions for detecting a dragging brake. The controller may perform operations including receiving data (302) from the first wheel sensor and the second wheel sensor, calculating (304) a wheel speed characteristic for each of the first wheel and the second wheel based on the data, identifying (306) a lowest value for the wheel speed characteristic, determining (308) a moving average for the wheel speed characteristic, comparing (310) the lowest value to the moving average, and whether the lowest value for the wheel speed characteristic indicates a dragging brake.