Automated Lightning Strike Protection Strip Application on Composite Structures
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Solution Overview
Problem
Composite structures, particularly used in aeronautical and aerospace applications, are vulnerable to lightning strikes due to their low electrical conductivity, and existing methods for applying lightning strike protection are either manual and fragile or not fully integrated with automated manufacturing processes.
Innovation Solution
The method involves using a reinforcement layer, such as unidirectional fiber reinforced composite tape, to support lightning strike protection strips during automated fiber placement or tape laying, minimizing stress on the protection strips and enabling their automatic application within the structure, thereby forming a robust and efficient conductive pathway to dissipate lightning energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual methods are used to apply lightning strike protection to composite structures, then the protection can be applied to fragile lightweight materials, but the manufacturing process is time-consuming and labor-intensive
Solution Approach 1:
The automated fiber placement machine performs multiple functions including laying reinforcement layers, applying lightning strike protection strips, and trimming excess material. The system serves itself by integrating all these operations into a single automated process, eliminating manual intervention and significantly improving manufacturing efficiency while maintaining protection reliability
Solution Approach 2:
The fiber placement apparatus is designed to perform multiple functions: it can lay reinforcement layers, apply lightning strike protection strips, and trim excess material. This multi-functional capability allows a single machine to complete the entire protection application process automatically, resolving the contradiction between reliability and productivity
2Productivity
If automated fiber placement is used to apply lightning strike protection, then manufacturing efficiency is improved, but the fragile protection strips are damaged during the process
Solution Approach 1:
The reinforcement layer is applied to the structural layer before the lightning strike protection strip is applied. This preliminary action creates a supportive base that protects the fragile protection strip from damage during subsequent automated application and trimming operations, maintaining both productivity and protection strip integrity
Solution Approach 2:
The reinforcement layer serves as a cushioning layer that absorbs and distributes stresses during the automated application process. This beforehand cushioning prevents direct stress concentration on the fragile protection strip, ensuring its integrity while enabling automated high-speed application
3Weight of moving object
If lightweight conductive layers are used for lightning strike protection, then the weight of composite structures is minimized, but the protection becomes extremely fragile and difficult to apply automatically
Solution Approach 1:
The reinforcement layer acts as an intermediary between the structural layer and the fragile lightning strike protection strip. It provides mechanical support during application, enabling automated manufacturing while maintaining the lightweight property of the final structure, thus resolving the contradiction between weight minimization and ease of manufacture
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 approach allows for the reliable and efficient automatic application of lightning strike protection during the manufacturing of composite structures, enhancing their resistance to lightning strikes while maintaining the lightweight and high strength-to-weight ratio benefits of composite materials.
Implementation Method 1
ensures that tensile stresses are borne by the at least one reinforcement layer to minimize stresses on the at least one lightning strike protection strip
Implementation Method 2
form a robust and efficient conductive pathway to dissipate lightning energy
Data Source
AI summary
A method for forming a structure having lightning strike protection includes receiving at least one structural layer, receiving at least one lightning strike protection strip disposed on at least one reinforcement layer, automatically applying the at least one lightning strike protection strip disposed on the at least one reinforcement layer onto the at least one structural layer, and forming the at least one structural layer, the at least one lightning strike protection strip, and the at least one reinforcement layer, into the structure. The at least one lightning strike protection strip comprises a first material, and the at least one reinforcement layer comprises a second material different from the first material. The automatically applying may include using at least one of fiber placement equipment, tape laying equipment, and similar automated equipment.