Frequency Response and Eddy Current Power Loss in Magneto-Mechanical Transmitters

TL;DR

This paper develops a comprehensive model for magneto-mechanical resonator arrays that accurately predicts frequency, mode shape, and eddy current losses, enhancing design and efficiency for ultra-low frequency magnetic communication systems.

Contribution

It introduces a generalized model that accounts for near-field magnetic interactions and nonlinearity, improving prediction accuracy over simplified methods.

Findings

Model accurately predicts frequency and mode shape in MMRA.

Eddy current loss predictions align with experimental data.

Enhanced understanding of magneto-mechanical array behavior.

Abstract

Magneto-mechanical transmitters offer a compact and low-power solution for the generation of ultra-low frequency (ULF) magnetic signals for through-ground and through-seawater communications. Resonant arrays of smaller magneto-mechanical transmitters are particularly interesting in this context as the physical scaling laws allow for the increase of operating frequency and reduce the power requirements for ULF signal generation. In this work, we introduce a generalized model for accurate prediction of frequency and mode shape in generalized magneto-mechanical resonator arrays (MMRAs) that accounts for near-field magnetic interactions as well as magnetically induced nonlinearity. Using experiments, we demonstrate that our predictive capability is significantly improved compared against simplified dipole approximations. We additionally model the eddy current losses internal to the array and find that they are in agreement with experimental observations.