Conductive Gel Gasket for Train Roof Antenna Sealing
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Solution Overview
Problem
Current methods for mounting antennas on corrugated train roofs face challenges in providing effective environmental seals and conductivity, leading to issues with RF interference and corrosion due to moisture and vibration.
Innovation Solution
A conductive polyurethane gel gasket with a metallic skeleton is used, combined with foam/gel members and sealing tape, to create a sealant assembly that fills surface voids and provides electrical conductivity between the antenna and the roof, while withstanding thermal and vibration conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a machined metal plate with lands and bays is used to fit between the corrugated roof and antenna base, then conductivity between the antenna and roof is provided, but the environmental seal against moisture and elements is insufficient
Solution Approach 1:
The patent uses a composite gasket assembly combining conductive material (for EMI shielding and conductivity) with elastomeric sealing material (for environmental sealing). The conductive gasket is positioned within a recess and surrounded by elastomeric sealant, creating a composite structure that simultaneously addresses both conductivity and moisture protection requirements.
Solution Approach 2:
The patent introduces an intermediary sealing structure consisting of elastomeric material and sealant that mediates between the conductive gasket and the external environment. This intermediary layer prevents moisture from reaching the conductive components and fasteners while allowing the conductive gasket to maintain electrical contact between the antenna and roof.
2Object-affected harmful factors
If silicone gum is applied all around the base and machined plate to provide environmental seal, then moisture protection is improved, but the complexity of assembly increases
Solution Approach 1:
The patent incorporates the elastomeric sealing material and sealant into the gasket assembly during manufacturing, creating a pre-assembled unit with integrated sealing capabilities. This preliminary action eliminates the need for separate sealing steps during installation, reducing assembly complexity while maintaining effective environmental protection.
Solution Approach 2:
The patent merges the sealing function with the gasket structure by integrating elastomeric material and sealant directly into the gasket assembly. This combination creates a unified component that provides both mechanical support/conductivity and environmental sealing in a single assembly operation, rather than requiring separate sealing steps.
3Strength
If fasteners are used to hold the antenna base to the plate and plate to the roof, then mechanical attachment is provided, but corrosion may attack the antenna/locomotive metallic junction causing breakdown in electrical conductivity
Solution Approach 1:
The elastomeric sealing material acts as an intermediary barrier between the fasteners and the external environment, preventing moisture from reaching and corroding the metallic fasteners and their contact points. This protective intermediary maintains the reliability of electrical conductivity pathways while allowing mechanical attachment to remain effective.
Solution Approach 2:
The elastomeric sealant creates a protective environment around the fasteners and metallic junctions, isolating them from corrosive elements such as moisture and oxygen. This inert protective layer prevents corrosion attacks that would otherwise degrade the electrical conductivity and mechanical strength of the fastener connections.
4Device complexity
If a flat antenna base is used to engage the tops of the ridges of the train roof, then simple antenna design is maintained, but effective sealing between the antenna and corrugated roof is difficult to achieve
Solution Approach 1:
The patent segments the sealing function from the antenna structure by introducing a separate gasket assembly that interfaces between the flat antenna base and the corrugated roof. This segmentation allows the antenna to maintain its simple flat-base design while the specialized gasket structure handles the complexity of adapting to corrugated surfaces and providing effective sealing.
Solution Approach 2:
The gasket assembly serves as an intermediary component between the flat antenna base and the corrugated roof surface. This intermediary structure adapts to the irregular roof geometry, filling gaps and creating effective sealing contact without requiring modification to the antenna's simple flat-base 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
The solution effectively seals out air and moisture, maintaining electrical conductivity and preventing corrosion, thereby reducing RF interference and ensuring reliable antenna performance in harsh environments.
Implementation Method 1
The gel of the gel skeletal member will migrate to fill surface voids and surface. The gel will remain tacky despite vibration and temperature variation.
Implementation Method 2
the metallic skeleton provides an electrical ground across the antenna/roof surface
Implementation Method 3
Fasteners compress the antenna base to the roof, such that the soft encapsulated gel is partly squeezed out and the underside of the base contacts the skeletal member
Data Source
AI summary
An electrically conductive assembly for providing a low electrical resistance contact between an antenna and the corrugated roof of a train. The assembly comprises a gel and skeletal gasket member which has an electrically conductive skeleton encapsulated in a tacky gel. Multiple foam and gel members, typically made up of compressible at least partially open cell foam, are laid in the troughs and are thick enough, such that the top surface of the foam and gel members is about equal to or slightly higher than the top surfaces of the ridges of the corrugated train roof. The antenna is then laid atop the gel and gasket member and bolted to the roof with fasteners in such a manner that the tacky flowable gel at least partially squeezes out the edges of the gel and gasket member as the antenna is compressed downward while the fasteners are snugged up. This compression allows the electrically conductive skeletal member to provide contact between the antenna and the roof, the roof typically metallic and that results in a decrease of EMI (electromagnetic interference).