Aircraft Wing Stringer Layout for Distal Skin Buckling
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Solution Overview
Problem
Aircraft wings experience structural instability due to buckling of the wing skin, particularly at unsupported regions near the distal ends of stringers, limiting mechanical performance and necessitating heavier structures to withstand loads.
Innovation Solution
Incorporating an auxiliary stringer that is non-parallel to the primary stringers, positioned proximal to the distal ends, which supports the skin and distributes loads, reducing the size of unsupported areas and suppressing buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional parallel stringers are used to support the wing skin, then the structure can maintain simplicity and ease of manufacture, but the unsupported skin areas near the distal ends become large and vulnerable to buckling
Solution Approach 1:
The stringer system is segmented into primary stringers extending along the wing length and auxiliary stringers positioned at distal ends. This segmentation allows each stringer type to perform its specific function: primary stringers provide overall support while auxiliary stringers specifically address buckling vulnerability at distal ends, thereby resolving the contradiction between structural strength and complexity.
Solution Approach 2:
The auxiliary stringers are strategically positioned only at the distal ends where skin buckling vulnerability is highest. This local reinforcement approach provides targeted support precisely where needed without adding complexity throughout the entire wing structure, resolving the contradiction by improving local strength without proportionally increasing overall complexity.
2Strength
If the wing structure is reinforced to prevent skin buckling in unsupported areas, then the mechanical performance and load-bearing capability improve, but the structural mass increases
Solution Approach 1:
Rather than uniformly reinforcing the entire wing structure, auxiliary stringers are placed only at distal ends where skin buckling vulnerability occurs. This localized reinforcement provides the necessary load-bearing improvement while minimizing additional structural mass, effectively resolving the contradiction between strength and weight.
Solution Approach 2:
The auxiliary stringers provide focused reinforcement at the most vulnerable locations (distal ends with large unsupported areas) rather than attempting to strengthen the entire wing uniformly. This partial action approach achieves sufficient load-bearing capability improvement without the excessive weight penalty of comprehensive reinforcement.
3Stability of the object's composition
If auxiliary stringers are added to support distal skin areas, then the unsupported skin area is reduced and buckling is suppressed, but the number of stringers and structural complexity increases
Solution Approach 1:
The stringer system is divided into primary stringers for overall support and auxiliary stringers for specific distal end reinforcement. This segmentation allows the auxiliary stringers to be added only where needed for buckling resistance without requiring a complete redesign of the entire stringer system, thus limiting the increase in complexity.
Solution Approach 2:
The auxiliary stringers serve multiple functions: they reduce unsupported skin area, suppress buckling, and can be integrated with existing primary stringers through joints. This multi-functionality justifies the addition of extra stringers by providing multiple benefits from a single structural element.
Data Source
AI summary
An aircraft wing including a skin and a framework for supporting the skin. The framework includes a spar extending along a length of the wing, the length extending between a root end and a tip end of the wing, a plurality of ribs extending chordwise between a leading edge of the wing and a trailing edge of the wing; and a plurality of stringers attached to the skin. The plurality of stringers includes a first stringer extending along the length of the wing, wherein a proximal end of the first stringer is arranged nearer the root end and a distal end of the stringer is arranged nearer the tip end; and an auxiliary stringer extending non-parallel with the first stringer and arranged such that a portion of the auxiliary stringer is proximal to the distal end of the first stringer.