Predictions of Transient Eddy Current Fields Using Surface Impedances in Shell Structures

Abstract

The surface impedance techniques have been discussed with moderate interest over the past fifteen years [1 - 6]. They are approached as a means to express sinusoidal fields by yielding a Neuman condition on the surface of conductors. They are generally applied when the skin depth is much less than the thickness characterizing conductor thicknesses within the problem. Some discussion has been given to their utilization near corners and slots [3]. They are not generally used as a means of approaching transient problems. The main focus of this work is in their utilization both in steady state and transient problems, primarily for shell type structures.