SAE Technical Papers

Title: Application of the Finite Difference Time Domain Code Ema3d to the Modeling of Indirect Lightning Effects in a Composite Panel and Wing Box
Document Number: 2001-01-2911

Author(s):
Francis E. Lenning - The Boeing Co.
Peter R. Rimbey - The Boeing Co.

Abstract:
The Finite Difference Time Domain (FDTD) method (as implemented in the commercial software package EMA3D) is used to model indirect lightning effects in a composite three-bladed panel and a composite wing-box. The analysis is compared with low-level continuous wave (LLCW) tests performed in the Boeing Lightning Effects Laboratory. Measured data include transfer functions for currents induced on metal tubing interior to the three-bladed-panel and wing-box. The thin wire and thin plate formalisms provided in EMA3D are used to model the composite surfaces and metallic conductors such as pipes in the wing-box. The wing-box is simulated both with and without apertures. The modeling results showed excellent agreement with measurements over a broad frequency range demonstrating the usefulness of FDTD as a predictive tool for lightning frequencies.