Pulse width modulation-based temperature tracking for feedback control of a shape memory alloy actuator.

ABSTRACT: This work presents a temperature-feedback approach to control the radius of curvature of an arc-shaped shape memory alloy (SMA) wire. The nonlinear properties of the SMA such as phase transformation and its dependence on temperature and stress make SMA actuators difficult to control. Tracking a desired trajectory is more challenging than controlling just the position of the SMA actuator since the desired path is continuously changing. Consequently, tracking the desired strain directly or tracking the parameters such as temperature and electrical resistance that are related to strain with a model is a challenging task. Temperature-feedback is an attractive approach when direct measurement of strain is not practical. Pulse width modulation (PWM) is an effective method for SMA actuation and i

SUBMITTER: Ayvali E 

PROVIDER: S-EPMC4002133 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature