Next-Generation Actuators Leading Breakthroughs

doi:10.1007/978-1-84882-991-6

Cited by 33 publications

(1 citation statement)

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“…New types of actuation are currently being studied to develop the next generation of mechanisms, in particular by employing smart materials [1][2][3]. The latter can change their shape or physical properties under the influence of external stimuli such as temperature, stress, magnetic or electric fields [4].…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of a prestressed mechanism with multi-antagonistic and hysteretic SMA actuation

Boufayed¹,

Chapelle²,

Destrebecq³

et al. 2020

Meccanica

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This paper deals with the specific hysteretic effects of a multi-antagonistic shapememory alloy (SMA) actuation system in which each wire can be thermally activated individually (one or more at a time). A planar system with six SMA wires organized in a ternary rotational symmetry is studied numerically, via finite element calculation software. The objective is to analyze the functional characteristics of such mechanism, whose response during a thermal activation sequence is multi-antagonistic and hysteretic. Important points are highlighted, such as the avoidance of buckling and plasticity, the possibility of locking a configuration without energy input, and the "attraction" effect of any heating step on the following steps. The feasibility of reaching a given target in the workspace is also illustrated. Finally, the analysis shows the necessity to consider these multi-antagonistic and hysteretic aspects of the actuation in the future design and control of such type of mechanisms. The latter could be of interest as hollow shaft rotary actuators with additional (small) translation degrees of freedom in applications requiring long-term and stable positioning at ambient temperature.

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Section: Introductionmentioning

confidence: 99%