Aircraft Door Locking System Segregated Emergency Release Mechanism
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Solution Overview
Problem
Current door locking systems for aircraft compartments are complex, heavy, and often fail to rapidly open the door when a significant pressure difference occurs, posing safety risks and compliance challenges with regulatory requirements.
Innovation Solution
A door locking system with segregated mechanisms for normal and emergency operations, utilizing a locking element that transitions between states via a first mechanism for normal opening and a second mechanism, which includes a pressure sensor and pyrotechnical or solenoid actuators for rapid emergency release, allowing for a simple, lightweight design that meets safety and certification standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single electromechanical system is used for both normal and emergency door operations, then device complexity is reduced, but the door cannot open rapidly enough during decompression emergencies
Solution Approach 1:
The locking system is divided into two independent mechanisms: a first mechanism for normal door operations and a second mechanism for emergency decompression release. This segmentation allows each mechanism to be optimized for its specific function, enabling rapid door opening during emergencies without requiring the entire system to be overly complex.
Solution Approach 2:
The emergency release function is extracted as a separate second mechanism that operates independently from the normal door locking mechanism. This extracted emergency mechanism can be specifically designed for rapid actuation using pyrotechnical or solenoid actuators, achieving high-speed door opening without compromising the simplicity of the normal operation system.
2Reliability
If high-grade components are used throughout the system, then reliability is improved, but weight and cost increase
Solution Approach 1:
Different quality levels are applied to different parts of the system based on their functional requirements. The emergency release mechanism, which critical for safety, uses high-reliability pyrotechnical or solenoid actuators. The normal operation mechanism can use standard electromechanical components, reducing overall weight and cost while maintaining adequate reliability for routine operations.
3Loss of time
If a segregated two-mechanism system is used, then rapid emergency release is achieved, but device complexity increases
Solution Approach 1:
The emergency release mechanism is designed to automatically activate when decompression is detected, eliminating the need for manual intervention or complex control logic. The system self-services the emergency function by monitoring pressure differential and autonomously triggering the release actuator, reducing the complexity burden of the segregated mechanism design.
4Speed
If pyrotechnical or solenoid actuators are used for emergency release, then actuation speed is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of using complex multi-stage actuation systems, the patent employs pyrotechnical or solenoid actuators that provide more than sufficient force and speed for the emergency release function. This partial or excessive action approach simplifies manufacturing by using proven, off-the-shelf actuator technologies rather than custom-designed complex mechanisms, achieving rapid door opening with manufacturable components.
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 enables rapid and reliable opening of aircraft compartment doors during pressure differences, reducing the risk of structural damage and ensuring compliance with safety regulations by segregating normal and emergency operations, using lower-grade components and optimizing noise reduction.
Implementation Method 1
a pressure sensor that monitors a difference in pressure between the compartments of the aircraft
Implementation Method 2
pyrotechnical or solenoid actuators for rapid emergency release
Implementation Method 3
pyrotechnical or solenoid actuators for rapid emergency release
Data Source
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AI summary
The present embodiments relate to a door locking system 230 for a door module 250 that separates compartments 102a, 102b in an aircraft 100. Door locking system 230 has locking element 711 that is adapted to maintain door panel 210 of door module 250 in a closed position. Door locking system 230 further includes first and second mechanisms 720, 730 that are adapted to release door panel 210 from the closed position in a normal and an abnormal mode, respectively. Second mechanism 730 is spatially segregated from and operates independently of first mechanism 720. Second mechanism 730 includes locking element release actuator 737, pressure sensor 733, and controller 736 that directs locking element release actuator 737 to act on locking element 711 when pressure sensor 733 detects a difference in pressure between the compartments 102a, 102b that exceeds a predetermined threshold.