TY - JOUR
T1 - Quality factor, static and dynamic responses of miniature galfenol actuator at wide range of temperature
AU - Ghodsi, Mojtaba
AU - Modabberifar, Mehdi
AU - Ueno, Toshiyuki
PY - 2011/12/30
Y1 - 2011/12/30
N2 - In this research, galfenol (iron-gallium alloy) is exploited to make a miniature actuator. The relationship between displacement and the applied current is measured. Furthermore, the dynamic behaviors of the actuator in wide range of temperature from cryogenic environment (77 K) to room temperature (RT) are investigated numerically and experimentally. Although, the length of galfenol bar is 10 mm and the maximum strain of annealed galfenol bar is 200 ppm, the large displacements of 37 and 25 μm are achievable at RT and 77 K, respectively when the coil is energized by ±1 A. The natural frequency of this actuator at RT and 77K is 1015 and 1075 Hz, respectively. Furthermore, modal analysis predicts the natural frequency of the actuator by maximum 9% error. Low hysteresis behavior makes this actuator suitable for positioning at both, RT and 77 K. It is also found that the low quality factor of actuator at RT is related to Joule heat dissipation.
AB - In this research, galfenol (iron-gallium alloy) is exploited to make a miniature actuator. The relationship between displacement and the applied current is measured. Furthermore, the dynamic behaviors of the actuator in wide range of temperature from cryogenic environment (77 K) to room temperature (RT) are investigated numerically and experimentally. Although, the length of galfenol bar is 10 mm and the maximum strain of annealed galfenol bar is 200 ppm, the large displacements of 37 and 25 μm are achievable at RT and 77 K, respectively when the coil is energized by ±1 A. The natural frequency of this actuator at RT and 77K is 1015 and 1075 Hz, respectively. Furthermore, modal analysis predicts the natural frequency of the actuator by maximum 9% error. Low hysteresis behavior makes this actuator suitable for positioning at both, RT and 77 K. It is also found that the low quality factor of actuator at RT is related to Joule heat dissipation.
KW - Cryogenic environment
KW - Galfenol (iron-gallium alloy)
KW - Miniature actuator
KW - Modal analysis
KW - Quality factor
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U2 - 10.5897/IJPS11.918
DO - 10.5897/IJPS11.918
M3 - Article
AN - SCOPUS:84855777675
SN - 1992-1950
VL - 6
SP - 8143
EP - 8150
JO - International Journal of Physical Sciences
JF - International Journal of Physical Sciences
IS - 36
ER -