Design, analysis, and modeling of giant magnetostrictuve transducers

dc.contributor.advisor Alison B. Flateau Calkins, Frederick
dc.contributor.department Aerospace Engineering 2018-08-23T09:37:20.000 2020-06-30T07:16:09Z 2020-06-30T07:16:09Z Wed Jan 01 00:00:00 UTC 1997 1997
dc.description.abstract <p>The increased use of giant magnetostrictive, Terfenol-D transducers in a wide variety of applications has led to a need for greater understanding of the materials performance. This dissertation attempts to add to the Terfenol-D transducer body of knowledge by providing an in-depth analysis and modeling of an experimental transducer. A description of the magnetostriction process related to Terfenol-D includes a discussion of material properties, production methods, and the effect of mechanical stress, magnetization, and temperature on the material performance. The understanding of the Terfenol-D material performance provides the basis for an analysis of the performance of a Terfenol-D transducer. Issues related to the design and utilization of the Terfenol-D material in the transducers are considered, including the magnetic circuit, application of mechanical prestress, and tuning of the mechanical resonance. Experimental results from two broadband, Tonpilz design transducers show the effects of operating conditions (prestress, magnetic bias, AC magnetization amplitude, and frequency) on performance. In an effort to understand and utlilize the rich performance space described by the experimental results a variety of models are considered. An overview of models applicable to Terfenol-D and Terfenol-D transducers is provided, including a discussion of modeling criteria. The Jiles-Atherton model of ferromagnetic hysteresis is employed to describe the quasi-static transducer performance. This model requires the estimation of only six physically-based parameters to accurately simulate performance. The model is shown to be robust with respect to model parameters over a range of mechanical prestress, magnetic biases, and AC magnetic field amplitudes, allowing predictive capability within these ranges. An additional model, based on electroacoustics theory, explains trends in the frequency domain and facilitates an analysis of efficiency based on impedance and admittance analysis. Results and discussion explain the importance of the resonance of the electromechanical system, as distinct from the mechanical resonance. Conclusions are drawn based on the experimental work, transducer analysis, and modeling approaches.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 12831
dc.identifier.contextkey 6510321
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/11832
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 18:59:28 UTC 2022
dc.subject.disciplines Electromagnetics and Photonics
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.disciplines Physics
dc.subject.keywords Aerospace engineering and engineering mechanics
dc.subject.keywords Engineering mechanics
dc.title Design, analysis, and modeling of giant magnetostrictuve transducers
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d dissertation Doctor of Philosophy
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