Aircraft Wing Box Bulkhead Joint Flex Angle Member
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Solution Overview
Problem
The existing connection methods between the center wing box and the fuselage in aircraft do not adequately address the stresses and forces transmitted through the center wing box, particularly under aerodynamic and weight conditions, requiring a secure and flexible connection to ensure structural integrity and efficient assembly.
Innovation Solution
A joint system utilizing a flex angle member with a first and second section connected to the center wing box and bulkhead, respectively, along with support members and corner fittings, which are designed to distribute loads and allow for independent deformation of the wing and fuselage, using materials like fiber-reinforced composites for enhanced strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection method is used between the center wing box and bulkhead, then structural strength is improved, but the ability to accommodate independent deformation of wing and fuselage is reduced
Solution Approach 1:
The joint system transitions from a rigid static connection to a dynamic flexible connection. The flex angle member with rounded corner allows the joint to adapt its configuration based on loading conditions, enabling independent deformation of the wing and fuselage while maintaining structural integrity through flexible load distribution.
Solution Approach 2:
The joint system changes the mechanical parameters of the connection by introducing flexibility through the rounded corner geometry and multiple support members. This allows the connection to exhibit different stiffness characteristics under different loading conditions, accommodating both strength requirements and deformation compatibility.
2Adaptability or versatility
If a flexible connection is used between the center wing box and bulkhead, then adaptability to deformation is improved, but load distribution capability is reduced
Solution Approach 1:
The joint system segments the load path into multiple independent load-bearing elements (first support members, second support members, and rounded corner). This segmentation allows each element to contribute to load distribution while collectively providing flexible adaptation to deformation through their coordinated action.
Solution Approach 2:
The joint system employs composite construction combining the flex angle member with multiple support members and rounded corner elements. This composite structure integrates the flexibility of the rounded corner geometry with the load-bearing capacity of the support members, achieving both adaptability and strength.
3Ease of manufacture
If traditional connection methods are used, then manufacturing simplicity is maintained, but assembly time and production costs are increased
Solution Approach 1:
The joint system is segmented into discrete components (flex angle member, support members, rounded corner) that can be manufactured independently and then assembled. This segmentation enables parallel manufacturing of components and simplifies the assembly process, reducing overall production time while maintaining manufacturing simplicity through standardized connection elements.
Data Source
AI summary
A joint for connecting a center wing box to a bulkhead of an aircraft. The joint includes a flex angle member with a first section shaped to abut against and be connected to the center wing box, a second section shaped to abut against and be connected to a first side of the deck of the bulkhead, and an intermediate rounded corner positioned between the first and second sections. First support members are attached to the center wing box at first pins and support a first side of the second section of the flex angle member. Second support members are attached to the web of the bulkhead at second pins and support a second side of the second section of the flex angle member. The first support members are positioned on a first side of the deck of the bulkhead and the second support members are positioned on an opposing second side of the deck.