Aircraft Lightning Arrestor with Rounded Conductive Element
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Solution Overview
Problem
Current lightning protection systems for aircraft, particularly small aircraft used in urban mobility, are ineffective in reducing the risk of lightning strikes due to their aerodynamic drag, limited effectiveness, and inability to prevent the formation of ascending ionized channels that can lead to lightning discharges, especially when made of composite materials that are poor conductors.
Innovation Solution
The anti-fond device system, which includes an anti-corona element with a rounded conductive surface and radially extending dissipators, is designed to dissipate electrical charges through corona micro-discharges, preventing the formation of ascending ionized channels by maintaining the electric field below the critical threshold for corona discharge initiation, and is integrated into a dielectric shell to minimize aerodynamic impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal mesh is applied to the surface of composite material parts to increase electrical conductivity, then the aircraft's protection against lightning strikes is improved, but the mass of the treatment increases and the surface area to be treated increases
Solution Approach 1:
The invention divides the lightning protection function into discrete modular elements (lightning protection elements) that can be selectively placed at critical locations on the aircraft structure, rather than applying continuous metal mesh coverage across entire surfaces. Each element provides localized protection and can be independently installed or removed.
Solution Approach 2:
The invention applies protection only where needed by placing lightning protection elements at specific critical locations on the aircraft structure where lightning strikes are most likely to occur or where the composite materials are most vulnerable, rather than uniformly treating all surfaces.
2Reliability
If electrostatic charge dissipaters are used to prevent lightning strikes, then the risk of lightning strikes is reduced, but aerodynamic drag increases due to their shape
Solution Approach 1:
The lightning protection elements feature rounded contours and curved surfaces instead of sharp edges or protruding shapes, which reduces aerodynamic drag while maintaining the electrical field distribution needed for lightning protection functionality.
Solution Approach 2:
The invention uses thin-film or shell-like protection elements that can conform to the aircraft surface without creating significant aerodynamic disruption, allowing the protective function to be integrated smoothly into the aircraft's aerodynamic envelope.
3Weight of moving object
If the aircraft structure uses composite materials to reduce weight, then the aircraft's weight decreases, but the electrical conductivity decreases making the aircraft more vulnerable to lightning strikes
Solution Approach 1:
The invention uses conductive composite materials or hybrid structures that combine the low-weight benefits of composite materials with the electrical conductivity needed for lightning protection, allowing the aircraft to maintain both weight reduction and protection capabilities.
Solution Approach 2:
The invention supplements composite material structures with discrete lightning protection elements placed at critical locations, providing targeted electrical conductivity enhancement only where needed rather than requiring the entire structure to be conductive.
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 anti-fond device significantly reduces the risk of lightning strikes by preventing the formation of ascending ionized channels, thereby protecting the aircraft from lightning damage while maintaining acceptable aerodynamic performance and minimizing weight and manufacturing costs.
Implementation Method 1
dissipate electrical charges through corona micro-discharges, preventing the formation of ascending ionized channels by maintaining the electric field below the critical threshold for corona discharge initiation
Data Source
Figure 1a~1c
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a lightning protection device (10) for an aircraft (50), comprising, on the one hand, a lightning protection element (20) having a rounded shape and an electrically conductive surface, intended to enclose an area of the aircraft structure (50) susceptible to catching a lightning strike, and on the other hand, one or more electrical charge sinks (30) attached to said lightning protection element (20). In particular embodiments, the lightning protection device (10) further comprises a dielectric shell (40) that encloses the lightning protection element (20) and the charge sink(s) (30).