Aircraft Fuselage Structural Panel Locking for Continuous Load Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aircraft designs with hinged doors and latching mechanisms for large cryogenic tanks are inefficient for continuous load transfer and require heavy components, limiting their use in daily opening and closure operations.
Innovation Solution
A fuselage design with a removable structural panel and a locking structure that allows for efficient closure and opening of openings, ensuring continuous load transfer by using symmetrical lock fittings and lock parts for alignment and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hinged doors with latching mechanisms are used for tank access, then ease of operation is improved, but device complexity and weight increase
Solution Approach 1:
The closure system is segmented into modular components: lock fittings integrated into the structural panel, lock parts integrated into the opening structure, and securing mechanisms. This segmentation allows independent optimization of each component and simplifies the overall system while maintaining ease of operation through straightforward assembly and disassembly procedures.
2Ease of operation
If hinged doors with latching mechanisms are used for tank access, then ease of operation is improved, but weight increases
Solution Approach 1:
The heavy hinge mechanism and complex latching system are extracted and replaced with a simplified locking system. The structural panel with lock fittings and the opening structure with lock parts create a direct locking connection without requiring continuous hinge support, significantly reducing the weight of the closure system while maintaining operational ease.
3Ease of operation
If hinged doors are used for tank access, then ease of operation is improved, but continuous load transfer capability deteriorates
Solution Approach 1:
The lock fittings and lock parts are pre-integrated into the structural panel and opening structure respectively, with predetermined alignment features. This preliminary integration ensures that when the panel is installed, the load transfer path is immediately established through the locked connection, providing continuous load transfer capability from the outset without requiring additional reinforcement or complex hinge support structures.
4Ease of repair
If structural panel is made fully removable for tank access, then ease of repair is improved, but manufacturing precision requirements increase
Solution Approach 1:
The locking system employs asymmetric lock fittings and lock parts with specific geometric features that guide alignment during installation. The circumferential edge geometry of the structural panel and the complementary geometry of the opening structure create a self-aligning mechanism that tolerates normal manufacturing variations while ensuring precise final positioning for full load transfer.
Data Source
AI summary
A fuselage of an aircraft includes a front portion and a rear portion, with at least one opening in the rear portion, with the opening being closeable by a structural panel fully removeable from the opening, wherein a locking structure for the structural panel is in the opening and configured to transfer loads between a primary structure of the fuselage and the structural panel. A method is disclosed for closing an opening of a fuselage, and an aircraft is disclosed having such a fuselage.