TY - JOUR
T1 - Application of computed phase transformation power to control shape memory alloy actuators
AU - Wijst, van der, M.W.M.
AU - Schreurs, P.J.G.
AU - Veldpaus, F.E.
PY - 1997
Y1 - 1997
N2 - This paper presents a control law for shape memory alloy (SMA) wire actuators. Unlike most laws reported in the literature, this control law includes both a feedback and an open-loop part. The open-loop part takes into account the stress - strain - temperature behaviour of SMA wires, as well as the dynamics of the heating and cooling process. A constitutive model for a NiTi wire is developed. This model is a compromise between accurate description of the real behaviour, and simplicity, since it must be used on-line for the determination of the open-loop part of the control law. The method is tested both in simulations and experiments on a system with one degree of freedom. The tracking performance of the controlled system was investigated for a number of trajectory-following tasks. The tracking error obtained with the proposed control method is considerably smaller than with feedback control only.
AB - This paper presents a control law for shape memory alloy (SMA) wire actuators. Unlike most laws reported in the literature, this control law includes both a feedback and an open-loop part. The open-loop part takes into account the stress - strain - temperature behaviour of SMA wires, as well as the dynamics of the heating and cooling process. A constitutive model for a NiTi wire is developed. This model is a compromise between accurate description of the real behaviour, and simplicity, since it must be used on-line for the determination of the open-loop part of the control law. The method is tested both in simulations and experiments on a system with one degree of freedom. The tracking performance of the controlled system was investigated for a number of trajectory-following tasks. The tracking error obtained with the proposed control method is considerably smaller than with feedback control only.
U2 - 10.1088/0964-1726/6/2/008
DO - 10.1088/0964-1726/6/2/008
M3 - Article
SN - 0964-1726
VL - 6
SP - 190
EP - 198
JO - Smart Materials and Structures
JF - Smart Materials and Structures
IS - 2
ER -