This paper proposes the controller design for a shape memory alloy (SMA) positioning actuator system. The system utilizes spiral-formed SMA wire as driving power source. generates force via temperature-based crystalline phase transitions. is deformed in spiral form under low temperature and heated by applying direct current, it recovers to original recovering force, which rotates attached load....

This paper describes two methodologies for increasing the actuation speed of the shape memory alloy (SMA) actuator in ambient environment. The first method involves the implementation of a simple, light-weight heat sink, which consists only of a combination of an outer metal tube with the silicone grease, but able to cool the heated alloy effectively. The second method describes a high current ...

In this paper, an electrothermal shape memory alloy helical spring actuator constructed from with copper-cored enameled wire is presented and fabricated. Based on the shear constitutive model of a alloy, Thermo equilibrium equation geometrical establish thermomechanical theoretical alloys under different scenarios. The behaviors were verified by numerical simulation experimental tests, properti...

This paper investigates the seismic response control of a nonlinear benchmark building with a new re-centering variable friction device (RVFD). The RVFD consists of three parts: (i) a friction generation unit, (ii) a piezoelectric actuator, and (iii) shape memory alloy wires. The friction unit and piezoelectric actuator compose the first subcomponent of the hybrid device that is a variable fric...

This paper introduces the development of a tactile device using a shape-memory alloy, and describes the information transmission by the higher psychological perception such as the phantom sensation and the apparent movement of the tactility. The authors paid attention to the characteristic of a shape-memory alloy formed into a thread, which changes its length according to its body temperature, ...