Research Papers

Forced Air Cooling of Shape-Memory Alloy Actuators for a Prosthetic Hand

[+] Author and Article Information
Fergus Taylor

University of Waikato,
Hamilton 3216, New Zealand
e-mail: fergustaylor.nz@gmail.com

ChiKit Au

Science and Engineering,
University of Waikato,
Hamilton 3216, New Zealand
e-mail: ckau@waikato.ac.nz

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received January 29, 2016; final manuscript received March 16, 2016; published online November 7, 2016. Assoc. Editor: Charlie C.L., Wang.

J. Comput. Inf. Sci. Eng 16(4), 041004 (Nov 07, 2016) (5 pages) Paper No: JCISE-16-1051; doi: 10.1115/1.4033233 History: Received January 29, 2016; Revised March 16, 2016

This research paper presents the development of nonconventional actuation technology for use in a prosthetic hand. Shape-memory alloy (SMA) is used for the actuation. SMA is a material which contracts when heated and relaxes when cooled and has a work density 25 times greater than traditional electric motor actuators. A compact SMA actuator array, position sensors, and power electronics are developed. A proportional-integral-derivative (PID) controller is used to control the contraction of the actuators. Forced air cooling is implemented to improve actuation frequency. The performance of an actuator is demonstrated in dynamic and static position experiments. The static position control of the actuator is found to remain within 0.7% (70 μm) of the setpoint during initial oscillation and then within 0.15% (15 μm) after oscillations subside. The dynamic position control experiment finds that the forced air cooling reduces actuation frequency from 9.5 s to 3.5 s. This results in an actuation frequency comparable to current commercial prosthetics. When compared with the most advanced commercial devices, this actuator array provides improvements in terms of cost, noise, and weight. All of which are important acceptance criteria for prosthetic hand users.

Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Hand model prototype

Grahic Jump Location
Fig. 2

Actuator array (fan and shroud removed)

Grahic Jump Location
Fig. 4

Power transistor circuit board

Grahic Jump Location
Fig. 5

Experimental actuator setup

Grahic Jump Location
Fig. 6

Complete experimental setup

Grahic Jump Location
Fig. 7

PID controller graphical interface

Grahic Jump Location
Fig. 8

Static setpoint stability

Grahic Jump Location
Fig. 9

Dynamic setpoint response




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In