Aircraft Thrust Reverser Adhesion Control System
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Solution Overview
Problem
The thrust reverser system in aircraft with turbojet engines faces high mechanical stress and increased fuel consumption and wear due to its activation at high engine speeds during landing, particularly in emergency situations, which affects its service life and safety.
Innovation Solution
A control method and system that estimates wheel adhesion and automatically activates or modulates the thrust reverser system based on detected slip rates, reducing pilot reaction time and limiting motor load, thereby reducing fuel consumption and wear without compromising safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thrust reverser system is activated at high engine speeds during landing, then the braking capability is improved, but the mechanical stress on the system increases and service life decreases
Solution Approach 1:
The system dynamically adjusts the engine speed parameter before activating the thrust reverser. By reducing engine speed to a predetermined range (e.g., 50-70% of maximum) prior to thrust reverser deployment, the mechanical stress on the system is significantly reduced while maintaining effective braking capability when needed.
2Reliability
If the thrust reverser system is frequently activated, then the braking performance is enhanced, but the fuel consumption and motor wear increase
Solution Approach 1:
The control system continuously monitors wheel adhesion conditions, slip rates, and braking performance through sensors and feedback loops. This enables intelligent decision-making about when to activate the thrust reverser, activating it only when adhesion is insufficient and braking performance requires enhancement, thereby avoiding unnecessary fuel consumption and motor wear.
Solution Approach 2:
Instead of continuously operating the thrust reverser or using it at maximum capacity, the system applies partial action by selectively activating it only when adhesion conditions require it. This moderate, condition-based approach maintains braking performance while significantly reducing overall fuel consumption and motor wear compared to continuous or excessive use.
3Measurement precision
If the pilot manually monitors and operates the braking system, then the control precision is maintained, but the reaction time to unexpected events increases
Solution Approach 1:
The braking system incorporates automatic monitoring and control functions that operate independently of pilot intervention. Sensors continuously detect wheel adhesion, slip rates, and braking conditions, with the control system automatically adjusting thrust reverser activation and braking force. This self-service capability maintains precise braking control while eliminating pilot reaction time delays, as the system responds immediately to unexpected events.
Solution Approach 2:
The system replaces manual pilot mechanical control with automated electronic sensing and control mechanisms. Electronic sensors and control units substitute for pilot monitoring and manual操作的, providing both the precision of electronic measurement and the instantaneous response time of automated systems, thereby resolving the contradiction between control precision and reaction time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances safety by reducing reaction time to unexpected events, decreases fuel consumption, and minimizes motor wear by selectively activating the thrust reverser only when necessary, ensuring effective braking while preserving the thrust reverser for emergency cases.
Implementation Method 1
The role of a thrust reverser is, during landing, to improve the braking capability of the aircraft by redirecting forwards at least one part of the thrust generated by the turbojet engine. In this phase, the thrust reverser directs forwardly at least one portion of the ejection flow of the turbojet engine, thereby generating a counter-thrust
Implementation Method 2
The aircraft braking systems include braking actuators (hydraulic or electromechanical), controlled to apply a braking torque to the wheels of the aircraft aiming to slow it down
Implementation Method 3
each braked wheel is equipped with a rotation speed sensor, the data measured by these sensors allow detecting the slip of one or more wheel(s)
Data Source
AI summary
The present disclosure relates to a method of controlling the braking of an aircraft equipped with a landing gear bearing braked wheels, the aircraft being propelled by jet engines and equipped with a thrust reversal system, the method involving the steps of estimating the grip/adhesion of the braked wheels and activating the thrust-reversal system or modulating the reverse-thrust generated by the thrust-reversal system if this system is already activated, based on the estimated grip/adhesion.