Accession Number:

ADA445671

Title:

A Free Energy Model for Hysteresis in Magnetostrictive Transducers

Descriptive Note:

Research paper

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION

Personal Author(s):

• Smith, Ralph C.
• Dapino, Marcelo J.
• Seelecke, Stefan

Report Date:

2002-01-01

Pagination or Media Count:

17.0

Abstract:

This paper addresses the development of a free energy model for magnetostrictive transducers operating in hysteretic and nonlinear regimes. Such models are required both for material and system characterization and for model-based control design. The model is constructed in two steps. In the first, Helmholtz and Gibbs free energy relations are constructed for homogeneous materials with constant internal fields. In the second step, the effects of material nonhomogeneities and nonconstant effective fields are incorporated through the construction of appropriate stochastic distributions. Properties of the model are illustrated through comparison and prediction of data collected from a typical Terfenol-D transducer.

Descriptors:

• *TRANSDUCERS
• *FREE ENERGY
• *HYSTERESIS
• *MAGNETOSTRICTION
• STOCHASTIC PROCESSES
• HOMOGENEITY
• HELMHOLTZ EQUATIONS
• PREDICTIONS
• MODELS
• NONLINEAR SYSTEMS
• INTERNAL

Subject Categories:

• Electrical and Electronic Equipment
• Numerical Mathematics
• Electricity and Magnetism
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE