Lightning-Dissipative Valve Frame Coating for Aircraft Grounding
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Solution Overview
Problem
Aircraft components made from moldable dielectric materials, such as PEEK, face the challenge of electric arcing and potential damage when exposed to lightning strikes due to the lack of an adequate dissipation path for lightning energy, as they often support conductive components susceptible to strikes.
Innovation Solution
The implementation of lightning-dissipative aircraft assemblies featuring a base dielectric component with a strike-susceptible metallic component and an electrically-conductive coating that forms a dissipation path from the metallic component to the aircraft's electrical ground plane, utilizing mounting hardware and grounding straps to direct lightning energy safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aircraft components are made from moldable dielectric materials (such as PEEK) to reduce weight and cost, then weight and manufacturing cost are reduced, but the component becomes susceptible to electric arcing and damage from lightning strikes due to lack of adequate dissipation path
Solution Approach 1:
The patent applies composite materials by combining dielectric material (PEEK) with electrically conductive elements (carbon fibers, conductive coatings, or metal inserts) to create a hybrid structure that maintains the weight advantages of dielectric materials while introducing lightning dissipation pathways. The conductive elements are integrated into the dielectric matrix to provide controlled electrical conductivity for energy dissipation.
Solution Approach 2:
The patent introduces intermediary conductive elements (such as carbon fiber reinforcement, conductive coatings, or metal inserts) that act as mediators between the dielectric component and the aircraft airframe ground plane. These intermediaries provide the necessary electrical pathway for lightning energy dissipation while allowing the primary component structure to remain dielectric.
2Temperature
If components are made from dielectric materials to take advantage of thermal tolerance properties, then thermal performance is improved, but lightning energy dissipation capability deteriorates
Solution Approach 1:
The patent applies local quality by maintaining the dielectric material's thermal tolerance properties in the bulk structure while introducing localized conductive pathways at specific locations (such as mounting interfaces, bonding surfaces, or integrated carbon fiber networks) where lightning energy dissipation is needed. This allows different regions of the component to have different electrical properties optimized for their specific functions.
3Strength
If bonding agents are used to attach dielectric components to metallic airframe structures, then structural integration is achieved, but the bonding agent may compromise the lightning dissipation path due to its dielectric properties
Solution Approach 1:
The patent extracts or removes the bonding agent from the lightning dissipation pathway by designing the component with integrated conductive elements that make direct contact with the metallic airframe structure, bypassing the bonding agent interface. Alternatively, conductive coatings are applied to surfaces that contact the airframe to ensure direct electrical contact independent of the bonding layer.
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 solution effectively prevents damage by rapidly dissipating lightning energy to the ground plane, ensuring the integrity of both the dielectric and conductive components, thereby enhancing safety and reducing the risk of arcing.
Implementation Method 1
an electrically-conductive coating formed on one or more surfaces of the base dielectric component. A lightning strike dissipation path extends from the strike-susceptible metallic component, through the electrically-conductive coating, and to the A/C electrical ground plane
Data Source
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AI summary
Lightning-dissipative A/C assemblies are provided, as are valve frames utilized within lightning-dissipative A/C assemblies. In embodiments, the lightning-dissipative A/C assembly includes a base dielectric component having a mount interface, a strike-susceptible metallic component coupled to the base dielectric component, and mounting hardware configured to engage the mount interface to attach the base dielectric component to an A/C. An electrically-conductive coating overlies or is formed over at least a portion of the base dielectric component to complete a lightning strike dissipation path. The lightning strike dissipation path extends from the strike-susceptible metallic component, through the electrically-conductive coating, through the mounting hardware, and to an A/C electrical ground plane when the lightning-dissipative A/C assembly is installed on the A/C. In one implementation, the base dielectric component assumes the form of a valve frame, while the strike-susceptible metallic component assumes the form of a valve door movably mounted to the valve frame.