Electrical resistivity-based study of self-sensing properties for shape memory alloy-actuated artificial muscle.
Shape memory alloy (SMA) has great potential to develop light and compact artificial muscle (AM) due to its muscle-like high power-to-weight ratio, flexibility and silent operation properties. In this paper, SMA self-sensing properties are explored and modeled in depth to imitate the integrated muscle-like functions of actuating and self-sensing for SMA-AM based on the investigation of SMA electrical resistivity (ER). Firstly, an ER transformation kinetics model is proposed based on the simulation of SMA differential scanning calorimetry (DSC) curves. Then a series of thermal-electrical-mechanical experiments are carried out to verify the validity of the ER model, whereby the SMA-AM self-sensing function is well established under different stress conditions. Finally the self-sensing capability is further demonstrated by its application to a novel SMA-AM-actuated active ankle-foot orthosis (AAFO).
State Key Laboratory of Mechanism System and Vibration, Institute of Robotics, Shanghai Jiao Tong University, Shanghai 200240, China. yhyin@sjtu.edu.cn.
Jian-Jun
JJ
Zhang
Yue-Hong
YH
Yin
Jian-Ying
JY
Zhu
D000497:Alloys / Q000737:chemistry*; D032701:Biomimetics / Q000295:instrumentation*; D003198:Computer Simulation; D017076:Computer-Aided Design; D003217:Conductometry / Q000295:instrumentation*; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D061826:Foot Orthoses; D006801:Humans; D008954:Models, Biological; D018482:Muscle, Skeletal / Q000502:physiology*; D014159:Transducers
D000497:Alloys