Spring-Erected Ballast Bag for Rapid Life Raft Stabilization
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Solution Overview
Problem
Inflatable life rafts face challenges with ballast bags that fail to unfold and fill with water quickly due to material setting during extended storage, affecting their ability to stabilize the raft within aerospace standards.
Innovation Solution
Integration of a cylindrical spring into the ballast bag that transitions from a compact state to an erect state upon deployment, allowing the bag to expand and fill with water efficiently, using a tubular center portion that matches the spring's diameter and remains compressed until activated by rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If ballast bags are packed tightly and stowed for extended periods, then aircraft weight is reduced and storage efficiency is improved, but the ballast bag material sets and takes the form of its packed condition, reducing the likelihood of rapid unfolding and water entrainment
Solution Approach 1:
A spring mechanism is pre-installed within the ballast bag structure that is ready to activate immediately upon deployment. The spring is compressed during packing and automatically expands when released, forcibly unfolding the ballast bag and promoting rapid water entrainment without requiring the material to overcome its packed-set condition
Solution Approach 2:
The spring mechanism changes the physical state of the ballast bag from a compacted, set condition to an expanded, upright condition. By introducing mechanical energy through spring expansion, the system overcomes the material's tendency to remain in its packed form and achieves the required unfolded configuration for rapid water filling
2Weight of moving object
If ballast bags are made from light weight materials, then aircraft weight is reduced, but the materials are generally buoyant and may not sink or stabilize effectively
Solution Approach 1:
The ballast bag system changes the density parameter by incorporating a spring mechanism that forces water into the bag. Even though the bag material itself is buoyant, the spring-driven water filling process transforms the overall density of the assembled ballast bag from buoyant to negatively buoyant, enabling effective stabilization
3Productivity
If ballast bags must fill to sixty percent volume within twenty five seconds, then aerospace standards are met, but the extended storage period reduces the likelihood of achieving this filling rate
Solution Approach 1:
The spring is pre-compressed and stored within the ballast bag structure during packing. Upon deployment, the spring automatically expands and applies mechanical force to unfold the bag and facilitate rapid water entry, ensuring the sixty percent filling requirement is met despite extended storage conditions
Solution Approach 2:
The spring mechanism introduces dynamic motion to the ballast bag system, transforming it from a static, set-packed condition to an active, unfolding state. The spring's expansion creates movement that actively promotes rapid water entrainment and achieves the required filling rate within the specified time
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
Enables rapid expansion and water retention of the ballast bag upon deployment, ensuring the life raft is stabilized and meets aerospace standards for stabilization within twenty seconds.
Implementation Method 1
a spring coupled to the top portion and the bottom portion and encapsulated by the center portion, the spring configured to push the top portion and the bottom portion away from the center portion
Data Source
AI summary
A ballast bag includes a top portion, a center portion coupled to the top portion, a bottom portion coupled to the center portion, and a spring coupled to the top portion and the bottom portion and encapsulated by the center portion, the spring being capable of expanding the ballast bag from a compact state to an erect state, the ballast bag being capable of retaining water in the erect state.