Modelling and Experimental Validation of the Acoustic Electric Feedthrough Technique

Abstract

This report outlines an investigation of an ultrasonic Acoustic Electric Feedthrough (AEF) to transfer power through a metal plate. This approach is being explored as a potential means of wirelessly powering in situ structural health monitoring systems embedded within aircraft and other high value engineering assets. A numerical model is developed describing the coupled electro-mechanical behavior of an AEF system, and is then validated using experimental data. Using a pair of well matched piezoelectric disks with 38 mm diameter and 2 mm thickness, and with 1 W of real input power, the AEF approach is shown to transfer approximately 300 mW of usable electrical power through aluminium plate with thicknesses in the range of 1.6 mm - 5 mm.