Evacuation Slide Beam Four-Point Cross Section
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Solution Overview
Problem
Inflatable aircraft evacuation slides face challenges in meeting FAA standards for wind resistance and load-bearing capacity while requiring a reduction in size for compact storage, as existing designs struggle to balance strength and compactness.
Innovation Solution
The design incorporates inflatable rail beams with a four-point cross section, featuring arcuate sections and indents, providing enhanced structural support and strength while minimizing volume through a symmetrical, clover-like geometry that allows for a ratio of small to large diameter between 3:5 and 4:6, enabling a 1%-5% increase in support strength and a 13% reduction in inflatable volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional circular cross-section beams are used, then the slide structure is simple and easy to manufacture, but the support strength is insufficient to meet wind and load requirements
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetric circular cross-section to an asymmetric four-point cross-section with arcuate sections and indents. This asymmetric geometry creates superior structural characteristics including higher area moment of inertia and more efficient stress distribution, resulting in enhanced support strength while maintaining manufacturability through inflatable construction
2Strength
If larger diameter beams are used to increase support strength, then wind and load resistance improves, but the slide volume increases making storage difficult
Solution Approach 1:
The patent applies parameter changes by modifying the cross-sectional geometry parameters from a circular shape to a four-point shape with specific arcuate sections and indents. This geometric parameter transformation increases the area moment of inertia and structural efficiency, enabling the beam to achieve required support strength with a smaller overall diameter, thereby reducing slide volume for storage while maintaining wind and load resistance
3Volume of moving object
If the slide is compacted for storage, then storage space requirements are reduced, but the structural integrity and strength may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the beam cross-section into four distinct arcuate sections separated by indents, rather than using a continuous circular section. This segmented geometry provides natural stress concentration points and structural zones that maintain integrity during compaction and inflation, allowing the slide to be stored in a compact state while ensuring structural reliability when deployed
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
According to various embodiments, disclosed is a beam structure comprising a four-point cross section for an inflatable article comprising an inflatable slide (100). The beam structure has greater beam strength and provides greater structural support than an inflatable beam having a traditional circular cross section. Said inflatable slide (100) can be used for emergency evacuation from aircrafts.