Frequency Response of Acoustic-Assisted Ni–Mn–Ga Ferromagnetic- Shape-Memory-Alloy Actuator
Name
Piezo-assisted actuator v5 print.pdf
Size
2.48 MB
Format
Adobe PDF
Checksum (MD5)
132e9bbc8d9df198e89b5498b88c09f9
Author(s)
Techapiesancharoenkij, Ratchatee
Kostamo, Jari
Allen, Samuel Miller
O'Handley, Robert C.
Date Issued
May 2009
Journal
Journal of Applied Physics
Publisher
American Institute of Physics
Citation
Techapiesancharoenkij, Ratchatee et al. “Frequency Response of Acoustic-assisted Ni–Mn–Ga Ferromagnetic-shape-memory-alloy Actuator.” Journal of Applied Physics 105.9 (2009): 093923.
Version
Author's final manuscript
Abstract
A prototype of Ni–Mn–Ga based ferromagnetic-shape-memory-alloy (FSMA) actuator was designed and built; an acoustic-assist technique was applied to the actuator to enhance its performance. A piezoelectric stack actuator was attached to the Ni–Mn–Ga sample to generate acoustic energy to enhance twin-boundary mobility and, hence, reduce the magnetic threshold field required for activating twin-boundary motion. The dynamic response of the acoustic-assist FSMA actuator was measured up to 1 kHz actuation. The acoustic assistance improves the actuator performance by increasing the reversible magnetic-field-induced strain (MFIS) by up to 100% (increase from 0.017 to 0.03 at 10 Hz) for drive frequencies below 150 Hz. For frequencies above 150 Hz, the acoustic-assist effect becomes negligible and the resonant characteristic of the actuator takes over the actuator response. Even though the acoustic assist does not improve the actuation at high frequencies, the MFIS output of 5% can be obtained at the resonant frequency of 450 Hz without acoustic assistance. The FSMA actuator is shown to be ideal for applications that require large strain at a specific high frequency.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.3125307
