Conductive MLI Panel Fastening for Grounding With Low Heat Transfer
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Solution Overview
Problem
Existing multi-layer insulation (MLI) systems for space bodies face challenges in providing a simpler, more effective, and cost-efficient fastening means that address electrostatic charge buildup and thermal conductivity while maintaining electrical grounding.
Innovation Solution
The use of electrically conductive pin elements with snap-fit or interference fit configurations for attaching MLI panels to space bodies, combined with removable seat or counter-hold elements, ensures secure attachment and electrical grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal fasteners and threads are used to hold MLI structures together, then electrostatic charge conductivity is improved, but thermal conductivity between insulation layers increases
Solution Approach 1:
The fastening system is segmented into multiple discrete pin elements distributed across the MLI panel, with each pin providing localized electrical grounding while maintaining thermal isolation between insulation layers through non-contact spacing
Solution Approach 2:
The pin elements act as intermediary components that provide electrical conductivity pathways for electrostatic discharge while the non-conductive spacers and air gaps serve as thermal mediators to prevent heat transfer between layers
2Reliability
If multiple metal or metal-coated elements are used for fastening, then electrostatic grounding is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The pin elements serve multiple functions simultaneously: they provide mechanical fastening, electrical grounding, and structural support for the MLI panel, eliminating the need for separate grounding wires and complex fastening assemblies
Solution Approach 2:
The design changes the configuration from numerous small fastening elements to fewer, strategically positioned pin elements with optimized spacing and dimensions, reducing overall component count while maintaining effective grounding coverage
3Ease of operation
If insulation layers are placed in direct contact with the space body, then attachment simplicity is improved, but thermal conduction to the space body increases
Solution Approach 1:
The insulation layers are extracted from direct contact with the space body through the use of pin elements with non-conductive spacers, removing the thermal conduction pathway while maintaining mechanical attachment
Solution Approach 2:
Non-conductive spacers and air gaps are introduced as intermediary elements between the insulation layers and space body, providing thermal and electrical isolation while allowing mechanical fastening through the pin elements
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
This method provides a cost-effective and efficient fastening system that minimizes thermal conductivity and effectively grounds the MLI panels, reducing electrostatic charge buildup and enhancing the performance of space bodies.
Implementation Method 1
each pin element serving as an electrical conduit to ground the MLI panel
Implementation Method 2
the shaft end having a length that is such that when the shaft end engages a space body the MLI panel is spaced from the space body
Data Source
AI summary
An MLI panel and method of attaching the same to a space body wherein the MLI panels are attached by way of a plurality of electrically conductive interference fit or snap-fit locking elements.