Fuel Tank Access Door Gasket With Reinforced Seal Under Dynamic Load
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Solution Overview
Problem
Current gaskets used in aircraft fuel tank access panels and doors fail to effectively seal under dynamic loads during flight, leading to leakage and premature failure due to compression beyond normal tolerances, and existing caulking materials require significant downtime for curing and have limited shelf life, increasing costs and inventory obsolescence.
Innovation Solution
A gasket design featuring a conductive triple-stranded knitted wire mesh integrated into an elastomeric sheet with a molded grommet and a rubberized tip portion, allowing for expansion under dynamic loads and providing effective sealing and EMI shielding, while eliminating the need for secondary wire mesh pieces that can cause premature failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional gasket is used to seal aircraft fuel tank access panels, then the gasket can be installed and provide initial sealing, but the gasket fails under dynamic loads during flight due to compression beyond normal tolerances
Solution Approach 1:
The gasket employs a composite construction combining an elastomeric base material with an embedded wire mesh reinforcement structure. This composite design provides both the flexibility needed for sealing and the structural strength to withstand dynamic compression loads during flight without failing beyond normal tolerances.
Solution Approach 2:
The wire mesh reinforcement is strategically positioned within specific regions of the gasket where compression loads are most severe. This localized reinforcement approach strengthens the gasket precisely where needed under dynamic flight conditions while maintaining the overall elastomeric sealing properties in other areas.
2Reliability
If caulking materials are used to seal fuel tank access ports, then sealing can be achieved, but significant downtime is required for curing and the materials have limited shelf life
Solution Approach 1:
The wire mesh reinforcement is pre-integrated into the elastomeric gasket during manufacturing, creating a ready-to-install composite sealing solution. This eliminates the need for on-site curing processes required by caulking materials, as the structural reinforcement is already in place before installation on the aircraft.
Solution Approach 2:
The gasket is designed as a replaceable component with a long service life, eliminating the need for periodic re-caulking. Unlike caulking materials that have limited shelf lives and require regular replacement with curing time, the reinforced gasket provides durable sealing that can be installed once and remain effective for extended periods.
3Reliability
If secondary wire mesh pieces are used in the gasket, then electrical conductivity can be provided, but premature failure occurs due to separation of the mesh from the elastomer
Solution Approach 1:
The wire mesh electrical conductivity layer is merged with the elastomeric sealing material through integration during manufacturing. This unified construction eliminates the separation issues between discrete mesh pieces and elastomer, ensuring both electrical conductivity and structural integrity are maintained throughout the gasket's service life without premature failure.
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 gasket design enhances sealing and environmental protection of aircraft fuel tanks by withstanding dynamic stresses, preventing leakage, and reducing maintenance downtime, while offering improved durability and reduced inventory costs through the use of a fluorosilicone polymer reinforced with Kevlar fibers and a conductive mesh for electrical conductivity.
Implementation Method 1
an annular elastomeric gasket having a conductive mesh integrated into the gasket to provide electrical conductivity between adjacent aircraft surfaces to be sealed
Implementation Method 2
This design provides a void space for the volumetric expansion of the sealing member under the compressive loading experienced during flight, thereby preventing leakage from the seal
Data Source
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AI summary
An annular elastomeric EMI shielding gasket includes a metallic mesh embedded in an elastomeric sheet for sealing and protecting aircraft fuel tanks and panels. In one embodiment, the gasket has a central region with a protruding portion to prevent leakage of fluid under the dynamic loading of the wing assembly experienced during flight. In another embodiment, the gasket has a rubberized tip portion providing the same advantages in an alternative configuration. In further embodiments, the annular inner section of the gasket includes a grommet bordering the gasket opening and encapsulating the inner most section of the gasket. In still further embodiments, the elastomeric sheet is formed from a fluorosilicate reinforced with Kevlar fibers, and the metallic mesh is formed from triple strand wire.