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Proceedings Paper

Simulations of magnetostrictive actuators for ultrasonic applications
Author(s): Zhongguo Wei; Goran Engdahl; Fredrik Stillesjo
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Paper Abstract

The dynamic behavior of Terfenol-D actuators with laminated magnetostrictive materials for ultrasonic applications has been modeled using a new technique developed on the Simulink platform. The nonlinear simulation model is based on the finite difference method and lumped-circuit approaches with modified constitutive equations, which can simultaneously handle the non-linearities, eddy currents, hysteresis effects, and the electrical, magnetic and mechanical system interactions. Because the power losses are so considerable at ultrasonic frequencies, a thermal lumped circuit approach of the electro-thermal performance has been incorporated in the model and the thermal balance of the actuators with possible cooling system thus can be taken into account in the whole system design. The nonlinear properties of Terfenol-D, obtained from static material characterizations, were used as numerical input to the simulation models. The model integration and some application examples including the numerical estimation of the effects of frequency, number of lamination, magnetostrictive rod dimensions, and eddy currents were presented. The preliminary result indicate that the new design and simulation package is very straightforward and the dynamic behavior of the laminated magnetostrictive actuators at high frequencies can be predicted and estimated fairly well from the simulation model.

Paper Details

Date Published: 14 June 2000
PDF: 9 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388247
Show Author Affiliations
Zhongguo Wei, Royal Institute of Technology (Sweden)
Goran Engdahl, Royal Institute of Technology (Sweden)
Fredrik Stillesjo, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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