Modular Fan Inlet Case Segmentation for Low-Cost Maintenance
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Solution Overview
Problem
Existing fan inlet cases for aircraft engines are costly and require significant maintenance and repair due to erosion and foreign object damage, with existing solutions not efficiently addressing the need for low-cost maintenance and modification of aerodynamic surfaces without altering the primary structural components.
Innovation Solution
A modular fan inlet case design featuring a structural backbone with replaceable shell members made from organic matrix composite, allowing for easy replacement of aerodynamic surfaces without major disassembly, utilizing low-cost lightweight methods like resin transfer molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire fan inlet case is constructed as a single structural component, then structural integrity is maintained, but maintenance cost and complexity increase significantly due to erosion and foreign object damage
Solution Approach 1:
The fan inlet case is divided into two main segments: a structural backbone that remains fixed and provides structural integrity, and replaceable shell members that can be easily removed and replaced. This segmentation allows the structural portion to maintain reliability while the shell members can be replaced independently to reduce maintenance costs and complexity.
Solution Approach 2:
The shell members are extracted as separate, replaceable components from the overall fan inlet case structure. These shell members can be removed and replaced without affecting the structural backbone, enabling targeted maintenance and repair of only the affected components rather than the entire structure.
2Strength
If titanium material is used for the fan inlet case, then strength and erosion resistance are improved, but manufacturing cost increases significantly
Solution Approach 1:
Instead of using expensive titanium material throughout the entire fan inlet case, the structural backbone is designed to provide necessary strength and erosion resistance only where structurally critical, while the shell members can be made from more cost-effective materials. This local quality approach optimizes material usage and reduces overall manufacturing cost while maintaining required performance.
Solution Approach 2:
The fan inlet case employs a composite structure combining different materials: the structural backbone uses high-strength, erosion-resistant materials where needed, while the shell members can utilize cost-effective materials that are sufficient for their protective function. This composite material strategy balances performance requirements with manufacturing cost considerations.
3Strength
If the fan inlet case is designed as a monolithic structure, then structural strength is maximized, but adaptability for modifications and updates is reduced
Solution Approach 1:
The fan inlet case is segmented into a permanent structural backbone and replaceable shell members. This segmentation maintains the structural strength of the backbone while enabling easy modification, update, or replacement of the shell members to adapt to different operational requirements or performance improvements.
Solution Approach 2:
The design introduces dynamic adaptability through replaceable shell members that can be swapped out as needed, while the structural backbone remains fixed to maintain structural integrity. This dynamic approach allows the system to adapt to changing requirements without compromising structural strength.
Data Source
AI summary
A modular fan inlet case (10) includes a center ring (12), an outer ring (14), and a plurality of struts (16) each coupled at a first end (18) to the center ring (12), and at a second end (20) to the outer ring (14). A plurality of shell members (22) are each configured to be removably coupled to a corresponding strut (16). Preferably, the plurality of shell members (22) each define a longitudinal groove (23) for being received onto the corresponding strut (16).