Airbag Assembly Non-Inflatable Panel Surface Tension
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Solution Overview
Problem
Inflatable airbags in vehicles face issues with surface tension during deployment, which can impede their relative motion with respect to adjacent vehicle structures, leading to potential misalignment and reduced effectiveness in energy dissipation and occupant restraint.
Innovation Solution
An airbag assembly with a non-inflatable external panel connected to the inflatable airbag panel, positioned between the inflatable portion and vehicle structures during deployment, to minimize surface tension and prevent direct contact, thereby enhancing deployment alignment and energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airbag is inflated with gas to pressurize and deploy, then the airbag achieves effective occupant restraint and energy dissipation, but surface tension in the material impedes relative motion with respect to adjacent vehicle structures
Solution Approach 1:
The airbag assembly is divided into distinct functional segments: the inflatable airbag panel for occupant restraint, and the non-inflatable external panel for guiding motion. This segmentation allows each part to perform its specific function without the constraints of surface tension affecting the entire assembly uniformly, enabling smoother deployment while maintaining restraint effectiveness.
Solution Approach 2:
The non-inflatable external panel acts as an intermediary between the inflatable airbag and the vehicle structure. It mediates the interaction by providing a controlled interface that reduces surface tension effects and facilitates relative motion during deployment, preventing direct contact between the high-tension airbag material and structural components.
2Manufacturing precision
If guide features are provided to allow tensioned material to move in a desired manner, then deployment alignment is improved, but the complexity of the airbag assembly increases
Solution Approach 1:
The guiding function is merged into the non-inflatable external panel that is already part of the airbag assembly structure. Rather than adding separate guide features to the inflatable portion, the external panel is designed with attachment features and geometric constraints that inherently provide the desired motion path, simplifying the overall design while achieving precise deployment alignment.
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
The non-inflatable external panel reduces surface tension issues, allowing smoother deployment and improved energy dissipation, ensuring effective occupant restraint and enhanced safety by preventing direct contact between the inflatable airbag and vehicle structures.
Implementation Method 1
When an airbag is deployed, it is inflated with a gas, which pressurizes the airbag
Implementation Method 2
induces surface tension in the material from which the airbag is fabricated
Implementation Method 3
the external panel is non-inflatable... substantially no surface tension is induced in the external panel when the airbag is inflated
Data Source
AI summary
An airbag assembly for use in a vehicle includes at least one airbag panel that defines an inflatable portion and a non-inflatable portion. An external panel is connected to the at least one airbag panel at the non-inflatable portion thereof such that at least a portion of the external panel is positioned adjacent to the inflatable portion defined by the at least one airbag panel, wherein the external panel is non-inflatable.