Barrier Curtain Cable Release for Aircraft Decompression Isolation
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Solution Overview
Problem
Existing methods for environmentally isolating compartments within aircraft, such as between the passenger and cargo compartments, face challenges in managing pressure variations and rapid decompression events, often requiring substantial structural members and decompression panels that add weight and cost.
Innovation Solution
A method and apparatus utilizing a barrier curtain supported by cables with a cable release mechanism that detaches at a predetermined load, allowing the curtain to drop during decompression events, thereby isolating volumes without the need for substantial structural frames or decompression panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substantial structural members and frames are used to support barrier curtains, then the barrier can effectively isolate compartments under normal pressure conditions, but the weight and cost of the aircraft increases
Solution Approach 1:
The barrier curtain system transitions from a static rigid frame support to a dynamic cable-supported system that can adapt to pressure differentials. The cable release mechanism allows the barrier to dynamically respond to decompression events by releasing the cable when pressure differential exceeds a threshold, enabling the curtain to drop and equalize pressure while maintaining isolation during normal operations.
Solution Approach 2:
The barrier curtain itself acts as a flexible element that can deform and move in response to pressure differentials, eliminating the need for rigid structural frames. The curtain is supported by flexible cables that can accommodate movement, allowing the barrier to maintain its sealing function while adapting to pressure changes without requiring substantial structural support.
2Adaptability or versatility
If integral decompression panels are used to accommodate rapid decompression, then pressure equalization can occur during decompression events, but the friction and material inconsistencies cause variable effectiveness
Solution Approach 1:
The cable release mechanism acts as an intermediary between the barrier curtain and the decompression function. Instead of relying on the curtain material itself to respond to decompression, the release mechanism mediates the response by detecting pressure differential changes and mechanically releasing the cable to allow the curtain to drop, providing more reliable and consistent decompression response.
Solution Approach 2:
The system replaces the friction-based mechanical response of traditional decompression panels with a cable release mechanism that uses tensile force and mechanical release. The cable is held in place by the release mechanism under normal conditions, and when decompression occurs, the mechanism releases the cable to allow the barrier to drop, providing a more reliable and less friction-dependent decompression response.
3Adaptability or versatility
If cable release mechanisms are used to allow barrier curtain movement during decompression, then pressure equalization is improved, but the device complexity increases
Solution Approach 1:
The cable release mechanism is designed to be self-actuating, using the pressure differential itself to trigger the release. When the pressure difference between compartments exceeds a predetermined threshold, the force from the pressure differential automatically releases the cable from the release mechanism, eliminating the need for external sensors, actuators, or control systems.
Solution Approach 2:
The release mechanism is calibrated with a predetermined threshold parameter that determines when the cable will release. This threshold is set based on the maximum expected pressure differential during normal operations, ensuring the cable remains secured during normal conditions but releases automatically when decompression pressure exceeds the threshold.
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
Effectively limits or prevents smoke and flame dispersion between compartments while accommodating pressure variations and decompression events without the need for additional structural support, reducing weight and cost.
Implementation Method 1
The pressure differential at which the integral decompression panels are caused to open may be dependent on friction which may, in turn, vary over time and from installation to installation
Data Source
AI summary
A method and apparatus are provided for at least partially environmentally isolating a volume, such as by environmentally isolating the cargo compartment from the passenger compartment of an aircraft. In the context of an apparatus, a barrier curtain is provided that partially defines the volume. The apparatus also includes a cable extending along one or more walls that partially define the volume. The barrier curtain is supported by the cable. The apparatus may also include a cable release mechanism. The cable is held in place by the cable release mechanism and the cable release mechanism is configured to detach the cable at a predetermined load, thereby permitting the barrier curtain to drop in response to a decompression event.