Aircraft Evacuation Slide With Segmented Inflatable Sections
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Solution Overview
Problem
Existing extendable aircraft evacuation slides face issues with inadequate length due to aircraft attitude changes and non-uniform surfaces, leading to suboptimal descent angles and potential injuries, as they are designed for static conditions and lack separate control over main and extendable portion inflation.
Innovation Solution
The design allows for separate inflation of extendable portions from the main portions, with integral formation for increased strength and reduced weight, and includes internal bulkheads to prevent fluid flow between sections, enabling manual actuation and a quick release system for improved stowage and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the slide length is fixed based on static conditions, then the device complexity is reduced, but the adaptability to different aircraft attitudes and surfaces deteriorates
Solution Approach 1:
The slide is divided into a main portion and an extendable portion that can be independently inflated. The extendable portion includes additional inflatable tubes that can be deployed to increase slide length when needed, allowing the system to adapt to varying door-to-ground distances without requiring a completely different slide for each condition.
Solution Approach 2:
The slide system transitions from a fixed static configuration to a dynamic configurable configuration. The extendable portion can be inflated or deflated based on real-time conditions, allowing the slide length to be adjusted dynamically to match the actual door-to-ground distance regardless of aircraft attitude or surface conditions.
2Ease of operation
If the main and extendable portions are inflated together automatically, then the ease of operation is improved, but the reliability of the evacuation system deteriorates due to inability to correct erroneous inflation
Solution Approach 1:
The inflation system is segmented into separate control mechanisms for the main portion and extendable portion. This allows independent control where the main portion can be inflated automatically while the extendable portion remains deflated until manually activated, enabling correction of premature or erroneous inflation decisions.
Solution Approach 2:
The main portion of the slide is inflated in advance as a preliminary action, providing immediate evacuation capability. The extendable portion remains ready but deflated, allowing operators to assess conditions and manually extend the slide length if the initial automatic inflation proves insufficient for the actual door-to-ground distance.
3Adaptability or versatility
If the extendable portion is always inflated to ensure sufficient length, then the adaptability to various conditions is improved, but the weight and volume of the deployed slide increases
Solution Approach 1:
The slide is segmented into essential main portion and optional extendable portion. The extendable portion with its additional inflatable tubes remains in a compressed stowed state during normal operations, adding minimal weight and volume. It is only inflated when actually needed to cover extended door-to-ground distances, thereby avoiding unnecessary weight penalties for routine evacuations.
4Strength
If the slide structure is made integral for strength, then the strength and rigidity are improved, but the ease of manufacture and assembly deteriorates
Solution Approach 1:
The slide structure is segmented into modular components including the main portion, extendable portion, and interconnecting elements. These segments can be manufactured separately using standardized processes and then assembled through proven connection mechanisms, reducing overall manufacturing complexity while maintaining structural integrity through proper joint design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures the extendable portions can be inflated as needed, maintaining optimal descent angles and preventing undesired inflation, thus enhancing the safety and effectiveness of aircraft evacuations by adapting to changing aircraft attitudes and surfaces.
Implementation Method 1
at least two inflatable upper tubes extending from the head end to the foot end
Implementation Method 2
Gas-impervious bulkheads may be present within the tubes, dividing the main and extendable portions from one another
Data Source
AI summary
Evacuation slide systems having extendable portions are detailed. The extendable portions of slides may be inflated separately from the main portions and actuated manually if desired. Consequently, attitude changes of, for example, an aircraft subsequent to inflation of the main portion of a slide would not necessarily defeat its use, as inflation of the extendable portion could still occur.