Dome-Shaped Pressure Bulkhead Attachment for Added Cabin Space
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Solution Overview
Problem
Existing aircraft designs face challenges in increasing pressurized cabin space without enlarging the fuselage size, as traditional rear pressure bulkheads require numerous parts and riveted connections, which are costly, time-consuming, and heavy.
Innovation Solution
A dome-shaped pressure bulkhead with obliquely extending coupling structures is used to displace the bulkhead, reducing the need for multiple parts and rivets by integrating the dome-shaped structure directly to the circumferential structure via a single coupling structure, allowing for additional pressurized space without enlarging the fuselage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rear pressure bulkheads are attached to the orbital fuselage joint using multiple mechanical connection elements (shearwebs, T-fittings, V-chords), then structural stability and load transmission are ensured, but the number of parts and riveted connections increases, leading to increased weight, manufacturing complexity, and production time
Solution Approach 1:
The patent merges multiple separate mechanical connection elements (shearwebs, T-fittings, V-chords) into a single integrated coupling structure. This coupling structure extends from the foot portion of the circumferential structure to the edge of the dome-shaped pressure bulkhead, consolidating multiple fastening functions into one component. This reduces the number of parts and riveted connections while maintaining structural stability and load transmission capabilities.
Solution Approach 2:
The coupling structure serves multiple functions simultaneously: it provides structural support, transmits loads from the pressure bulkhead to the circumferential structure, ensures air-tightness, and enables the displacement of the bulkhead to a delayed position. By integrating these multiple functions into a single component, the patent reduces overall device complexity while maintaining strength.
2Volume of moving object
If the rear pressure bulkhead is moved to a delayed position to increase pressurized cabin space, then additional cabin volume is gained, but multiple mechanical connection elements are required to provide stability and resistance to the connection
Solution Approach 1:
The patent uses a single integrated coupling structure to enable the displacement of the pressure bulkhead to a delayed position. This coupling structure combines multiple fastening and support functions that would traditionally require separate components, thereby allowing increased cabin volume without proportionally increasing device complexity.
Solution Approach 2:
The coupling structure extends obliquely from the foot portion of the circumferential structure to the edge of the dome-shaped structure, utilizing three-dimensional spatial arrangement. This oblique extension allows the bulkhead to be positioned at a delayed location while maintaining structural integrity, effectively using spatial dimensionality to achieve volume increase with minimal additional complexity.
3Reliability
If numerous parts and riveted connections are used to attach the pressure bulkhead, then structural integrity is maintained, but manufacturing time and production costs increase
Solution Approach 1:
The patent consolidates multiple separate parts and riveted connections into a single coupling structure with fewer fastening points. This integration maintains structural integrity by providing continuous load path from the pressure bulkhead to the circumferential structure, while significantly reducing the number of assembly operations required during manufacturing.
Solution Approach 2:
The coupling structure is designed as a single integrated component that can be manufactured as one piece or pre-assembled unit, reducing the need for multiple separate parts. This segmentation approach at the component level (rather than multiple connection elements) simplifies the overall assembly process and reduces manufacturing time while maintaining reliability.
Data Source
AI summary
A section of fuselage for an aircraft including: a pressure bulkhead having a dome-shaped structure and at least one coupling structure extending from the edge of the dome-shaped structure, and at least one circumferential structure arranged on a skin of the section of fuselage, wherein the dome-shaped structure is secured to the circumferential structure via a distal portion of the coupling structure, wherein said distal portion is coupled to a foot portion of the circumferential structure, the coupling structure extending obliquely from the foot portion of the circumferential structure, such that the distance between a skin of the section of fuselage and the coupling structure increases from the foot portion to the edge of the dome-shaped structure.