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Real Time Digital Control of a Magnetostrictive ActuatorThe use of the magnetostrictive material Terfenol-D as a motion source in active vibration control (AVC) systems are being studied. Currently it is of limited use due to the nonlinear nature of the strain versus magnetization curve and the magnetic hysteresis in the Terfenol-D. One manifestation of these nonlinearities is waveform distortion in the output velocity of the transducer. For Terfenol-D to be used in ever greater numbers of AVC systems, these nonlinearities must be addressed. In this study the nonlinearities are treated as disturbances to a linear system. The acceleration output is used in simple analog and digital feedback control schemes to improve linearity of the transducer. In addition, the use of a Terfenol-D actuator in an AVC system is verified. Both analog and digital controllers are implemented and results compared. A cantilever beam system is considered for AVC applications. The second thrust of this presentation is the reduction of harmonic distortions. Two conclusions can be reached from this work. One, the linearization of Terfenol-D transducers is possible with the use of feedback controllers, both digital and analog. Second, Terfenol-D is a viable motion source in active vibration control systems utilizing either analog or digital controllers.
Document ID
19960047703
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Zrostlik, Rick L.
(Iowa State Univ. of Science and Technology Ames, IA United States)
Hall, David L.
(Iowa State Univ. of Science and Technology Ames, IA United States)
Flatau, Alison B.
(Iowa State Univ. of Science and Technology Ames, IA United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1996
Publication Information
Publication: Proceedings of the 4th Annual Workshop: Advances in Smart Materials for Aerospace Applications
Subject Category
Nonmetallic Materials
Accession Number
96N33313
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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