Aircraft Nose Structure with Integrated Pressure Bulkhead
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Solution Overview
Problem
Conventional aircraft nose structures with retractable landing gear are heavy and complex, as they require separate pressure-tight bulkheads and reinforcements, which increase mass and manufacturing costs.
Innovation Solution
A simplified aircraft nose structure design where the pressure-tight bulkhead includes a floor that forms part of the pressurized zone, combined with a sandwich structure and monolithic elements, reduces weight and complexity by using transverse reinforcing frames and lateral panels with arches and flanges to distribute loads, and incorporates a protective panel for impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional configuration with separate pressure-tight bulkhead and floor is used, then structural integrity and pressure resistance are ensured, but mass and device complexity increase
Solution Approach 1:
The patent merges the pressure-tight bulkhead and the floor into a single integrated structure. The bulkhead is designed to include both the vertical separation wall and the horizontal floor element, eliminating the need for separate components. This integration maintains the pressure-resistant function while reducing the total mass and number of parts that need to be manufactured and assembled.
Solution Approach 2:
The integrated bulkhead structure serves multiple functions simultaneously: it acts as the pressure-tight separation between zones, provides the floor for the unpressurized landing gear compartment, and maintains structural integrity under pressurization loads. This multi-functionality reduces the need for additional separate structural elements.
2Stability of the object's composition
If a conventional configuration with separate pressure-tight bulkhead and floor is used, then structural integrity is ensured, but device complexity and manufacturing cost increase
Solution Approach 1:
By combining the bulkhead and floor into one integrated component, the patent reduces design complexity. Instead of designing, manufacturing, and assembling two separate parts with their own fastening systems and alignment requirements, the integrated structure is designed as a single unit, simplifying the overall design process and reducing assembly complexity.
3Ease of manufacture
If the floor and rear panel are separate elements, then manufacturing flexibility is maintained, but mass and assembly complexity increase
Solution Approach 1:
The patent integrates the floor and rear panel into a single monolithic structure. This integration eliminates the mass of fasteners, joining materials, and the additional structural reinforcement that would be needed to connect separate elements. The monolithic design maintains manufacturing flexibility by being produced as a single component that can be manufactured using standard processes.
Data Source
AI summary
An aircraft nose structure includes a fuselage and a pressuretight bulkhead fixed at its periphery to the fuselage and transversely dividing the fuselage into a pressurized upper zone and an unpressurized lower zone for accommodating retractable nose landing gear. The pressuretight bulkhead includes a floor of the pressurized upper zone, and a substantially flat rear panel extending between a rear edge of the floor and the fuselage. The floor and the rear panel are fixed laterally to the fuselage. The fuselage includes an exterior wall and reinforcing transverse frames to which the exterior wall is fixed. In line with the pressuretight bulkhead, at least some of the transverse reinforcing frames extend along the outline of the pressurized upper zone and constitute members that reinforce the pressuretight bulkhead.