Aircraft Stop Barrier With Slack Strap Segmentation
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Solution Overview
Problem
Existing aircraft stopping barriers often cause excessive stress on fragile aircraft equipment due to 'all or nothing' behavior of additional straps, leading to uncontrolled loosening and potential damage during engagement.
Innovation Solution
Incorporating an additional strap with a relaxed intermediate section and two distinct contiguous strands, where the binding thread has lower resistance than the connecting means, allowing for progressive extra length release and smoother movement of elementary nets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If additional straps with identical characteristics are used to give excess length to straps, then stress distribution is improved, but uncontrolled slackening occurs causing critical damage to aircraft surfaces
Solution Approach 1:
The additional strap is divided into two separate and contiguous strands instead of being a single uniform strap. This segmentation allows the strands to separate progressively under stress, controlling the slackening process and preventing uncontrolled damage to aircraft surfaces while still providing stress distribution benefits
Solution Approach 2:
The two strands are positioned at different locations within the additional strap structure, creating local variations in the stress distribution pattern. This allows different parts of the strap system to engage at different stress levels, providing controlled progressive slackening rather than simultaneous release
2Strength
If straps are made completely taut between stop structure and braking device, then structural strength is improved, but excessive stress is exerted on fragile aircraft equipment
Solution Approach 1:
The strap system transitions from a static taut state to a dynamic state where the additional strap can progressively release excess length. The two strands are designed to separate controllably under load, allowing the system to adapt its tension characteristics during aircraft engagement and deceleration, reducing peak stresses on fragile equipment
Solution Approach 2:
The mechanical properties of the additional strap are modified by using two separate strands with different positioning and characteristics. This changes the stress-strain behavior of the strap system, allowing it to provide structural strength when needed while progressively releasing tension to protect fragile aircraft equipment during engagement
Data Source
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AI summary
The invention relates to a stop barrier (BA) for an aircraft, comprising a set of elementary nets (1) arranged parallel to each other, each elementary net comprising a generally vertical stop structure (10) which extends between a first upper strap (2) and at least a second lower strap (3), said first and second straps each comprising two end portions (20) for connection to a braking device, the end portions (20) of either the upper and/or lower strap(s) comprising a slack intermediate section (21), i.e a section which is not tensioned and which forms an "excess length", and the barrier comprising an additional strap (6) the opposite ends (60, 61) of which are attached by connecting means to the corresponding ends of the slack intermediate section (21), the additional strap (6) comprising a region (62) in which it consists of two separate and contiguous strands (62A, 62B), the binding yarn, i.e. the weft or warp yarn of said additional strap (6) being common to the two strands (62A, 62B), the tear resistance of the binding yarn being lower than that of the connecting means.