Automated FDTD Model Conversion for Aircraft Lightning Analysis
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Solution Overview
Problem
Current finite-difference time-domain (FDTD) analysis of structural products like aircraft is labor-intensive and error-prone due to the manual conversion of geometric models with numerous component parts and fasteners, lacking detailed fastener-level analysis and traceability, which complicates lightning impact assessment and protection mechanisms.
Innovation Solution
An automated method and system that converts CAD models of structural products with traceable fastener identifiers into FDTD models, assigning electrical properties to simulate lightning impact, allowing for detailed fastener-level analysis and traceable output for improved lightning protection design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual conversion of CAD model to FDTD model is performed to accurately represent all component parts and fasteners, then modeling precision is improved, but labor intensity and time cost increase significantly
Solution Approach 1:
The system performs preliminary automated processing of the CAD model to generate the FDTD model structure, fastener identifiers, and mesh configuration before the actual FDTD analysis. This preliminary automated conversion eliminates the need for manual, time-consuming conversion work while maintaining modeling accuracy.
Solution Approach 2:
The system creates a digital copy of the CAD model structure in FDTD format through automated processing, preserving all geometric information, fastener locations, and structural relationships. This automated copying process maintains modeling precision while dramatically reducing the time and labor required compared to manual conversion.
2Measurement precision
If all fasteners are individually modeled in the FDTD model to enable fastener-level analysis, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the fastener population into groups based on their electromagnetic characteristics, geometric properties, and spatial distribution. By identifying and grouping fasteners with similar properties, the system enables fastener-level analysis while reducing model complexity through representative sampling and aggregation of similar fasteners.
Solution Approach 2:
The system applies different levels of modeling detail to different fasteners based on their local importance and electromagnetic characteristics. Critical fasteners in high-risk areas are modeled with full detail, while less critical fasteners use simplified representations, optimizing the balance between measurement precision and model complexity.
3Manufacturing precision
If manual conversion process is used to update FDTD model when design changes occur, then modeling accuracy is maintained, but productivity decreases
Solution Approach 1:
The system establishes a feedback mechanism that automatically detects design changes in the CAD model and triggers corresponding updates to the FDTD model. This automated feedback loop ensures model accuracy is maintained while eliminating the manual update process, significantly improving productivity when design changes occur.
4Productivity
If automated conversion is implemented to reduce manual effort, then productivity is improved, but traceability and accuracy may be compromised
Solution Approach 1:
The automated conversion process performs preliminary validation and verification steps, including checking fastener identifier traceability, validating geometric transformations, and ensuring electrical property assignments are correct. This preliminary automated quality assurance maintains model traceability and accuracy while enabling high-speed automated conversion.
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
Enables efficient and accurate FDTD analysis of lightning impact on aircraft fasteners, providing specific protection mechanisms and reducing the time and cost associated with manual conversions and general joint assumptions, while ensuring traceability for better electromagnetic environment understanding and communication during design and manufacturing.
Implementation Method 1
one or more electrical properties describing an effect of electromagnetic radiation on the component parts and fasteners
Data Source
AI summary
An apparatus for conducting an engineering analysis of a structural product is provided. The apparatus produces a computer-aided design (CAD) model of the structural product including component parts joined by fasteners and produces a finite-difference time-domain (FDTD) model of the structural product from the CAD model. The apparatus assigns one or more electrical properties to a mesh of elements representing the component parts and fasteners, and performs a finite-difference time-domain analysis on the FDTD model with the one or more electrical properties assigned, and with the FDTD model exposed to simulated lightning, to predict an impact of lightning on the fasteners and therefrom generate a corresponding prediction. The apparatus produces an output based on the corresponding prediction that indicates one or more levels of the impact of lightning on the fasteners and displays the output to facilitate design or manufacture of the structural product.