Aircraft Fuselage Window Offset Layout for Simplified Air Ducting
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Solution Overview
Problem
The installation of riser tubes in the restricted space between the cabin side wall and outer skin of an aircraft fuselage is laborious and expensive due to the limited space and the presence of frames and window openings, necessitating a reduction in the number of parts required.
Innovation Solution
The aircraft fuselage portion is designed with offset window openings to create enlarged intermediate regions on one side and reduced regions on the other, allowing a single large tube portion for internal air ducting in the enlarged regions, while the reduced regions remain free of ducting, thereby reducing the number of required installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If riser tubes are installed in the restricted space between cabin side wall and outer skin, then air distribution function is achieved, but installation effort and cost increase due to limited space and multiple frames
Solution Approach 1:
The patent combines multiple riser tube installations into a single large tube portion by offsetting window openings. Instead of installing separate riser tubes in each intermediate region between frames, the offset creates one enlarged intermediate region that accommodates a single large tube portion, merging multiple functions into one structure and reducing installation effort
Solution Approach 2:
The patent applies asymmetric offsetting of window openings in the longitudinal direction to create unequal intermediate regions. By offsetting windows asymmetrically, one intermediate region becomes enlarged while the other becomes reduced, allowing asymmetric placement of the tube portion to optimize space utilization and reduce the number of installations
2Productivity
If multiple riser tubes are installed in each intermediate region, then air ducting coverage is improved, but manufacturing time increases due to multiple installation steps
Solution Approach 1:
The patent merges multiple tube portion installations into a single installation operation. By offsetting window openings to create one enlarged intermediate region, the design allows installation of a single large tube portion that serves multiple frames simultaneously, reducing the number of installation steps and increasing productivity
Solution Approach 2:
The patent incorporates the tube portion installation into the preliminary assembly process during fuselage construction. The enlarged intermediate region is designed into the fuselage structure before final assembly, allowing the tube portion to be installed as part of the structural assembly rather than as a separate subsequent operation
Data Source
AI summary
An aircraft fuselage portion including at least four frames arranged uniformly one behind the other in an aircraft longitudinal direction, a fuselage outer skin on an outer side of the frames and at least three window openings. Internal air ducting tube portions are arranged in intermediate regions extending between window openings and frames, and along the frames. All window openings are offset counter to the aircraft longitudinal direction, in each case by a linear amount defined between longitudinal central points of the window openings and central planes which are arranged in parallel between two adjacent frames. The intermediate regions are enlarged by the linear amount on common first longitudinal sides of each window opening, and the intermediate regions are smaller by the linear amount on the other, second, sides of each window opening. The tube portions are arranged in the enlarged intermediate regions.