Aircraft Door Centering System Reducing Rotation
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Solution Overview
Problem
Current mechanisms for controlling the translating motion of aircraft doors are complex, heavy, ineffective, and expensive, leading to undesirable contact and rotation issues during opening and closing, which complicates the process and increases operational challenges.
Innovation Solution
A tracking door centering system comprising an elongate member with centering tracks and followers that limit rotational movement about a vertical centerline, using a biasing mechanism to maintain the door's parallel position relative to the opening, thereby reducing contact between the door edges and the fuselage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current mechanisms are used to control translating motion, then the door can move between open and closed positions, but the mechanisms are complex, heavy, and cause contact between door edges and fuselage
Solution Approach 1:
The control system is divided into multiple independent centering tracks (first centering track, second centering track) that work together to control different aspects of door movement. Each track independently guides the door edge, segmenting the complex control function into simpler, modular components that reduce overall system complexity while maintaining operational smoothness
Solution Approach 2:
The centering tracks act as intermediary elements between the door and the fuselage opening. These tracks provide a guided path that mediates the door's movement, preventing direct contact between the door edges and the fuselage while maintaining smooth translating motion during opening and closing operations
2Manufacturing precision
If current mechanisms are used to control translating motion, then the door can be positioned, but rotational movement about vertical centerline occurs causing contact with fuselage
Solution Approach 1:
The centering tracks are positioned specifically at critical locations (first centering track at one edge, second centering track at the other edge) to provide localized control over door positioning. This local quality approach ensures precise control at the door edges where contact prevention is most critical, while allowing the rest of the door structure to move freely
Solution Approach 2:
The centering tracks serve as intermediary guide structures that prevent harmful contact between the door edges and fuselage. By introducing these intermediate guiding elements, the system achieves precise door positioning while eliminating direct contact that would cause damage or operational issues
3Device complexity
If simpler mechanisms are used, then device complexity is reduced, but tighter control of door position during initial opening and final closing cannot be achieved
Solution Approach 1:
The simple yet effective control is achieved by segmenting the centering function into two separate tracks rather than using a single complex mechanism. This segmentation allows each track to focus on guiding one edge of the door, providing tight control during critical phases of operation while keeping the overall mechanism simple and manageable
Data Source
AI summary
A method and apparatus for a tracking door centering system. An apparatus may comprise an elongate member, a first centering track, and a second centering track. The elongate member may have a first end and a second end capable of being rotatably mounted to a door along an axis that may be substantially parallel to a horizontal centerline. The first centering track may be mounted on the first end. The second centering track may be mounted on the second end. The first centering track and the second centering track may be movable to reduce rotational movement of the door during movement of the door about a vertical centerline when a first follower is engaged in the first centering track and a second follower is engaged in the second centering track.