Journal
SENSORS
Volume 13, Issue 10, Pages 12958-12974Publisher
MDPI AG
DOI: 10.3390/s131012958
Keywords
shape memory alloy; artificial muscle; self-sensing model; electrical resistivity; active ankle-foot orthosis
Funding
- National Basic Research Program of China (973 Program) [2011CB013203]
- National Natural Science Foundation of China [61375098/61075101/60643002]
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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).
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