scholarly journals Low spring index, large displacement Shape Memory Alloy (SMA) coil actuators for use in macro- and micro-systems

2014 ◽  
Author(s):  
Brad Holschuh ◽  
Dava Newman
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Large Displacement ◽  
Micro Systems

“Monolithic Shape Memory Alloy Actuators”: A New Concept for Developing Smart Micro-Devices

1999 ◽  
Vol 604 ◽  
Author(s):  
Y. Bellouard ◽  
T. Lehnert ◽  
T. Sidler ◽  
R. Gotrhardt ◽  
R. Clavel
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical System ◽  
Design Strategy ◽  
Special Design ◽  
Friction Forces ◽  
Scale Down ◽  
Micro Actuators ◽  
Scaling Down ◽  
Micro Systems

AbstractIn micro-robotics and for micro-systems, one cannot simply scale down conventional actuators. Specific difficulties like friction forces between parts and the assembly have to be considered carefully and need a special design strategy adapted to this “micro-world”. Shape Memory Alloys (SMA) have strong potential in micro actuators. So far, most of SMA devices used the SMA material as a part of a mechanical system, which raised several problems when scaling down. In this paper, a concept of monolithic SMA micro-devices, which consists in considering the SMA as a mechanical system by itself, is presented. Several applications are shown to illustrate this concept.

Synergistically configured shape memory alloy for variable stiffness translational actuation

2019 ◽  
Vol 30 (6) ◽  
pp. 844-854 ◽  
Author(s):  
D Nalini ◽  
K Dhanalakshmi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Variable Stiffness ◽  
Large Displacement ◽  
Linear Actuator ◽  
Shape Memory Alloy Wire ◽  
Alloy Wire ◽  
Active Compliance ◽  
Wide Range ◽  
Stiffness Profile

The structural composition of two elastic elements, shape memory alloy wire (active actuating element) and spring (the passive bias), offers variable stiffness actuation. Based on this principle, a variable stiffness linear actuator is conceptually designed and developed. It is electromechanical by nature, that is, it is electrically activated and creates translational/linear motion. The variable stiffness linear actuator engages shape memory alloy wire(s) along with a passive compression spring to work synergistically. The biasing element offers recovery force to the shape memory alloy wire as well as compliance to the whole structure. The synergistic configuration exhibits an aiding force, thereby allowing an actuation with large displacement and a wide range of stiffness. The actuator mechanism is implemented through parallel action and further proposes two different modes of operation: pull mode (i.e. the disc moving along a fixed shaft) and push mode (i.e. linear reciprocating motion of the pushrod). The shape memory alloy configured actuator mechanism is analysed theoretically; the working model of the variable stiffness linear actuator is developed and investigated experimentally. The results apprise that the variable stiffness linear actuator is capable of offering large displacement and in reproducing the stiffness profile for active compliance control applications.

Structure and mobility of martensite variant interfaces in a Cu-Zn-AI shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 519-522 ◽  
Author(s):  
W. Cai ◽  
J. X. Zhang ◽  
Y. F. Zheng ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensite Variant

Analysis of the effect of Heat Treatments in the manufacturing process of Shape Memory Alloy Springs

2017 ◽  
Author(s):  
Ricardo Alexandre Amar de Aguiar ◽  
Pedro Manuel Calas Lopes Pacheco ◽  
Brenno Tavares Duarte
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Manufacturing Process ◽  
Heat Treatments

Comparative Analysis of a Tuned Mass Damper Using Steel and a Ni-Ti Shape Memory Alloy

2019 ◽  
Author(s):  
Marcelio Ronnie Dantas de Sá ◽  
Armando Wilmans Nunes da Fonseca Júnior ◽  
Yuri Moraes ◽  
Antonio Almeida Silva
Keyword(s):  
Comparative Analysis ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Tuned Mass Damper ◽  
Mass Damper
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