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Design of Various Actuators Using SMA Wire

Seok Heo

Abstract


This paper presents an experimental approach to design three different type actuation systems (bending, piston, and strip actuator) by using a shape memory alloy wire (SMA), composite strip, and spring. The spring is used to provide recovery force after actuation of the SMA wire. To  investigate thermo-mechanical characteristics of the SMA wire, a series of DSC tests have been conducted and tensile tests under various levels of pre-stress and input power have been performed. Based on the measured properties of the SMA wire, three-type actuators are designed and tested for different combination of strip, number of springs, and input power. Also, performance of the devices was compared in terms of actuation displacement, blocking force and efficiency. As the experimental results, we observe reasonable actuation behaviors. Finally, we have discussed on the characteristics of devices and suggested a reasonable actuation system of fish robots.

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References


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DOI: http://dx.doi.org/10.21535%2FProICIUS.2009.v5.560

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