Flat Aircraft Bulkhead With Concentric Ring Stiffening
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Solution Overview
Problem
Conventional aircraft bulkheads are either dome-shaped, which are lighter but require more space, or planar with reinforcing structures that save space but are heavier, and both types are difficult to manufacture due to closed cavities and complex connections.
Innovation Solution
A flat bulkhead design with a planar exterior shell, inclined portions, and a stiffening structure composed of concentrically arranged elements, connected to an interior shell with openings, allowing easy manufacturing and reduced weight by distributing pressure loads efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a dome-shaped bulkhead is used, then the weight is reduced, but the longitudinal space requirement increases
Solution Approach 1:
The bulkhead is divided into multiple components: an exterior shell, an interior shell, and a stiffening structure with concentric rings. This segmentation allows the flat bulkhead to achieve the structural integrity normally provided by a dome shape while maintaining a compact flat form factor that reduces longitudinal space.
Solution Approach 2:
The stiffening structure uses concentric rings arranged in multiple dimensions between the interior and exterior shells. This multi-dimensional reinforcement system provides the necessary structural strength to replace the three-dimensional dome shape with a flat configuration, reducing longitudinal space while maintaining weight efficiency.
2Length of stationary object
If a planar pressure bulkhead with reinforcing structure is used, then the longitudinal space is reduced, but the weight increases
Solution Approach 1:
The stiffening structure applies reinforcement locally through concentric rings positioned at specific intervals between the interior and exterior shells. This localized reinforcement provides structural strength only where needed, avoiding the excessive weight of a fully reinforced planar bulkhead while maintaining structural integrity.
Solution Approach 2:
The bulkhead combines different structural elements (exterior shell, interior shell, and stiffening rings) into a composite structure. This composite design achieves optimal weight-to-strength ratio by using minimal reinforcement elements strategically positioned, rather than uniform reinforcement throughout the planar surface.
3Weight of moving object
If a dome-shaped bulkhead is used, then the weight is reduced, but the manufacturing difficulty increases due to closed cavities
Solution Approach 1:
The bulkhead is segmented into separate components (exterior shell, interior shell, stiffening structure) that can be manufactured independently and then assembled. This segmentation eliminates the manufacturing difficulties of closed dome-shaped cavities while maintaining the weight advantages of a streamlined design.
Solution Approach 2:
The stiffening structure with concentric rings acts as an intermediary element between the interior and exterior shells, providing a simplified assembly process. These rings serve as connection points and structural supports that facilitate manufacturing and assembly while maintaining the overall lightweight design.
4Length of stationary object
If a planar pressure bulkhead with reinforcing structure is used, then the longitudinal space is reduced, but the manufacturing complexity increases
Solution Approach 1:
The concentric rings of the stiffening structure serve multiple functions: they provide structural reinforcement, connect the interior and exterior shells, and simplify the assembly process. This multi-functionality reduces overall structural complexity while achieving the space-saving flat design.
Solution Approach 2:
The concentric rings are arranged in multiple dimensions between the interior and exterior shells, creating a structured yet simplified reinforcement system. This multi-dimensional arrangement provides necessary structural complexity only where required, avoiding unnecessary complexity in the overall design.
Data Source
AI summary
A bulkhead for an aircraft, that has a substantially flat shape. The bulkhead has an exterior shell and a stiffening structure provided thereon. An interior shell can be formed and connected in an outer region to the exterior shell and in an inner region to the stiffening structure. Further disclosed are an aircraft having such bulkhead and a method of manufacturing such bulkhead.