Development and applications of a smart textile actuator by flat knitting technology

Abstract

The purpose of this research is to develop a smart textile actuator for clothes. We developed a soft actuator with shape memory alloy wire by using flat knitting technology. It is capable of generating a maximum force of 0.61 N/mm and a maximum contraction of 7.8% when used for compression stockings. It was possible to increase the compression pressure from 10 hPa to 30 hPa in approximately 10 s. We also developed a soft actuator prototype of a flat knitting actuator covered by silicone sheets for a power assist suit. It has a length of 100 mm, a width of 60 mm, and a thickness of 2.3 mm. This actuator is capable of generating a maximum force of 22.7 N, which is more than twice the tension when it is 100% stretched. The data show that the soft actuator can be used for a power assist suit to prevent lumbago.