Document Type
Thesis
College
College of Engineering
Department
Mechanical Engineering
Degree
MSE in Mechanical Engineering
Date Completed
2015
First Committee Member
Riofrio, Jose
Second Committee Member
Shin, Moochul
Third Committee Member
Dini, Said
Additional Committee Member(s)
Khosrowjerd, Mohammad
Abstract
"This research examines the implementation of Nitinol wires as a complex shape actuation source specifically targeted for low-power muscle biomimetics. Nitinol is a type of shape memory alloy (SMA) which recovers its original shape after experiencing large deformation when heated above an austenite finish temperature. Previous preliminary work (by Prof. J. Riofrio, Prof. M.Shin, and Oliver Mestre) demonstrated successful closed-loop force control (i.e., recovery stress) using a simple proportional controller. The work presented in this report builds upon the previous work by improving the results of the force control, demonstrating closed-loop position control of various wire arrangements in the presence of inertial loads. A pre-deformed NiTi (4% pre-strain) wire is energized via Joule heating (martensite to austenite) and de-energized by conductive cooling (austenite to martensite). The main experimental platform utilized for the purposes of this work consisted of a horizontally arranged NiTi wire (or wire bundle) fixed at one end and connected to a hanging weight through a pulley on the opposite end. The angular displacement of the pulley was measured with a non-contact magnetostrictive angle sensor, thereby providing the control feedback signal for the wire displacement."
Recommended Citation
Hariri, Nasir Ghazi, "Experimental study of nitinol wire arrangements as servo-biomimetics for facial muscles" (2015). Master’s Theses - College of Engineering. 7.
https://digitalcommons.law.wne.edu/coetheses/7