TY - GEN

T1 - Wide band modeling and parameter identification for magnetostrictive actuators

AU - Ekanayake, D. B.

AU - Iyer, R. V.

AU - Dayawansa, W. P.

PY - 2007

Y1 - 2007

N2 - Smart materials, such as magnetostrictive and piezoelectric materials and shape memory alloys, display certain coupling phenomena between applied electromagnetic or thermal fields and their mechanical properties. This leads to complicated constitutive behaviors of actuators built from these materials and limits their effective use. In this paper, we introduce a model for magnetostrictive actuators that effectively captures phenomenological behavior over the frequency range 0-800 Hz. The model includes rate-independent hysteresis, classical eddy current losses, excess losses, magneto-elastic coupling and inertial effects. In related work, we had shown the existence, uniqueness and stability of weak solutions to this model for voltage inputs in the space L2(0, T) ∩L∞(0, T) and external mechanical forces in the space L2(0, T). In this paper, we also propose a method for identifying parameters related to the eddy current and excess losses. Our method holds the hysteresis loss per cycle at a constant value as the frequency of the input voltage is changed, which then allows the identification of the parameters related to eddy and excess losses using linear programming. Our theoretical analysis indicates that the lead resistance cannot be assumed to have a constant value at frequencies higher than 800 Hz, which means that the skin effect becomes important at higher frequencies.

AB - Smart materials, such as magnetostrictive and piezoelectric materials and shape memory alloys, display certain coupling phenomena between applied electromagnetic or thermal fields and their mechanical properties. This leads to complicated constitutive behaviors of actuators built from these materials and limits their effective use. In this paper, we introduce a model for magnetostrictive actuators that effectively captures phenomenological behavior over the frequency range 0-800 Hz. The model includes rate-independent hysteresis, classical eddy current losses, excess losses, magneto-elastic coupling and inertial effects. In related work, we had shown the existence, uniqueness and stability of weak solutions to this model for voltage inputs in the space L2(0, T) ∩L∞(0, T) and external mechanical forces in the space L2(0, T). In this paper, we also propose a method for identifying parameters related to the eddy current and excess losses. Our method holds the hysteresis loss per cycle at a constant value as the frequency of the input voltage is changed, which then allows the identification of the parameters related to eddy and excess losses using linear programming. Our theoretical analysis indicates that the lead resistance cannot be assumed to have a constant value at frequencies higher than 800 Hz, which means that the skin effect becomes important at higher frequencies.

UR - http://www.scopus.com/inward/record.url?scp=46449110004&partnerID=8YFLogxK

U2 - 10.1109/ACC.2007.4283004

DO - 10.1109/ACC.2007.4283004

M3 - Conference contribution

AN - SCOPUS:46449110004

SN - 1424409888

SN - 9781424409884

T3 - Proceedings of the American Control Conference

SP - 4321

EP - 4326

BT - Proceedings of the 2007 American Control Conference, ACC

Y2 - 9 July 2007 through 13 July 2007

ER -