Arched Inflatable Evacuation Slide Truss Structure
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Solution Overview
Problem
Emergency evacuation slides for aircraft lack sufficient structural support to prevent bending or buckling under heavy loads, which can compromise their integrity and safety during evacuation.
Innovation Solution
An evacuation slide system featuring an arched dropdown tube and straps that form a truss structure with side and center tubes, distributing loads and enhancing structural integrity while minimizing weight and pack volume, thereby preventing bending and deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional tubes and straps are utilized to increase structural strength, then the beam strength and stiffness of the evacuation slide is improved, but the weight and pack volume of the slide increases
Solution Approach 1:
The patent employs an arched configuration for the dropdown tube and support structures, utilizing curved geometry to enhance structural strength and load distribution. The arch shape naturally distributes forces along its curve, providing superior beam strength compared to straight tubes, while requiring less material for equivalent support.
Solution Approach 2:
The evacuation slide is divided into multiple functional segments including side tubes, center tubes, dropdown tubes, and truss structures. This segmentation allows each component to be optimized independently for strength-to-weight ratio, with the arched dropdown tube providing focused support where needed without requiring additional tubes throughout the entire structure.
2Strength
If additional tubes and straps are utilized to increase structural strength, then the beam strength and stiffness of the evacuation slide is improved, but the pack volume of the slide increases
Solution Approach 1:
The arched dropdown tube serves multiple functions simultaneously: it provides structural support, acts as a load-bearing element, defines the slide pathway, and contributes to the overall truss structure. This multi-functionality eliminates the need for separate supporting members, reducing pack volume while maintaining stiffness.
Solution Approach 2:
The patent merges the support function with the existing dropdown tube and side tube structures by integrating the arched configuration into the fundamental load-bearing elements. This consolidation provides enhanced stiffness without adding discrete supporting members that would increase pack volume.
3Stability of the object's composition
If an arched dropdown tube with truss structure is used, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The arched configuration provides inherent structural stability through its curved geometry, which naturally resists bending and buckling loads. The arch shape distributes forces along its curve, creating a stable load path that enhances structural integrity without requiring complex bracing or additional stabilization components.
Solution Approach 2:
The arched dropdown tube and truss structure are designed to self-support under load conditions, with the geometry itself providing the necessary stability. The structure serves its own support function through its configuration, eliminating the need for additional active stabilization systems or complex control mechanisms.
Data Source
Figure 1A
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Figure 2
AI summary
An evacuation slide (100) may comprise an arched tube (220) configured to extend between a first side tube (222) and a second side tube (224) of the evacuation slide (100) and a strap (230) configured to be coupled between the arched tube (220) and a center tube (226) of the evacuation slide (100). The arched tube )220) may be configured to provide vertical support to the first side tube (222) and to the second side tube (224) in response to a tension in the strap (230). The evacuation slide (100) may comprise a dual lane slide, the first side tube (222) and the center tube (226) defining a first lane and the second side tube (224) and the center tube (226) defining a second lane.