Fiber Composite Aircraft Cabin Door with Integral Framework
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Solution Overview
Problem
Conventional aircraft pressurized cabin doors are heavy, complex to manufacture, and lack the necessary strength and dimensional stability under internal cabin pressure loading.
Innovation Solution
A fiber composite aircraft pressurized cabin door with an integral door structure unit comprising an outer skin and a door framework featuring edge and longitudinal supports, configured to allow open interstices for easier manufacturing and integration of actuation systems, utilizing carbon fiber composite materials for reduced weight and enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials and structures are used for aircraft cabin doors, then strength and durability are achieved, but weight increases and manufacturing complexity increases
Solution Approach 1:
The patent applies composite materials consisting of fiber reinforcement (such as carbon fiber, glass fiber, or aramid fiber) combined with a matrix material (resin or metal) to create a door structure that achieves high strength-to-weight ratio. The fiber composite construction allows the door to maintain structural integrity while significantly reducing weight compared to conventional solid metal construction.
Solution Approach 2:
The door structure is segmented into distinct functional components: an outer skin for structural integrity and pressure resistance, and an inner framework for support and actuation system integration. This segmentation allows each component to be optimized independently for its specific function while maintaining overall structural efficiency and reducing total weight.
2Strength
If conventional door structures are used, then strength is achieved, but manufacturing complexity and production time increase
Solution Approach 1:
The outer skin and inner framework are merged into a single integrated fiber composite structure that can be manufactured as one piece using techniques like resin transfer molding (RTM). This integration eliminates the need for separate manufacturing and assembly operations, significantly reducing manufacturing complexity and production time while maintaining structural strength.
Solution Approach 2:
The manufacturing process utilizes parameter changes in the matrix material, transitioning from a viscous resin state during injection to a cured solid state in the final product. This allows complex three-dimensional structures to be formed in a single manufacturing step, reducing assembly complexity and production time.
3Stability of the object's composition
If solid door structures are used, then strength and stability are achieved, but weight increases
Solution Approach 1:
The fiber composite door structure incorporates a porous or cellular matrix structure that provides dimensional stability and rigidity while maintaining low weight. The porous architecture distributes structural loads effectively and maintains shape under cabin pressure, achieving stability without requiring solid, heavy construction.
Solution Approach 2:
The combination of high-strength fiber reinforcement with a porous or cellular matrix creates a composite material that achieves optimal balance between weight and dimensional stability. The fiber network maintains structural integrity while the porous matrix reduces density, achieving both lightweight construction and high stability.
4Adaptability or versatility
If complex door structures are used to accommodate actuation systems, then functionality is achieved, but manufacturing complexity increases
Solution Approach 1:
The door structure is segmented into an outer skin and an inner framework, creating dedicated spaces within the framework for actuation systems such as hydraulic or electric actuators. This segmentation allows complex mechanical systems to be integrated within the door without complicating the overall manufacturing process, as the framework can be molded with built-in mounting features.
Data Source
AI summary
An aircraft pressurized cabin door includes an integral door structure unit made of fiber composite, the unit including an outer skin and a door framework arranged on an inner side of the outer skin. The framework includes a plurality of edge supports and a plurality of longitudinal supports extending in a width direction between the edge supports so as to form door framework interstices delimited by the inner side of the outer skin, by the edge supports and by the longitudinal supports. The door framework interstices are configured in a manner open toward the inner side of the door.