One-dimensional analytical constant parameter linear electromagnetic-magnetomechanical models of a cylindrical magnetostrictive Terfenol-D transducer
- Iowa State Univ., Ames, IA (United States)
One dimensional analytical constant parameter linear electromagnetic-magnetomechanical models of a cylindrical magnetostrictive Terfenol-D transducer are developed and discussed. Maxwell`s equations are solved for the magnetic field strength as a function of radial position. Closed form expressions for magnetic flux as a function of position are then derived, from which driving point electrical impedance functions are calculated. Two different physical models of the transducer are presented. The first model results in the classic eddy current solution for a rod in a wound wire solenoid. The second physical model includes the effects of a conducting external cylindrical housing. Motional (magnetomechanical) effects are incorporated into the electromagnetic model via the classic low signal transduction equations and principles from vibrations. Motional effects result in a frequency dependant, complex valued expression for the magnetic permeability of Terfenol-D. Driving point electrical impedance functions for both physical models are compared with an experimental measurement for a particular Terfenol-D transducer while it was in its low signal, linear range of operation. The second physical model was found to offer the better approximation of the experimental measurement of the transducer`s driving point electrical impedance with typical errors in magnitude or phase of less than {+-}5% for excitation frequencies between 100 and 10,000 Hz.
- OSTI ID:
- 395189
- Report Number(s):
- CONF-940691-; ISBN 1-56676-171-9; TRN: IM9648%%312
- Resource Relation:
- Conference: 2. international conference on intelligent materials, Williamsburg, VA (United States), 5-8 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of Second international conference on intelligent materials: Proceedings; Rogers, C.A.; Wallace, G.G. [eds.]; PB: 1410 p.
- Country of Publication:
- United States
- Language:
- English
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