| id |
ecaade2022_125 |
| authors |
Chen, Emily, Lu, Glenn, Barnik, Lyric and Correa, David |
| year |
2022 |
| title |
Fast and Reversible Bistable Hygroscopic Actuators for Architectural Applications Based on Plant Movement Strategies |
| source |
Pak, B, Wurzer, G and Stouffs, R (eds.), Co-creating the Future: Inclusion in and through Design - Proceedings of the 40th Conference on Education and Research in Computer Aided Architectural Design in Europe (eCAADe 2022) - Volume 1, Ghent, 13-16 September 2022, pp. 261–270 |
| doi |
https://doi.org/10.52842/conf.ecaade.2022.1.261
|
| summary |
Plant movement is of great inspiration for the development of actuators in architectural applications. Since plants lack muscles, they have developed unique hygroscopic mechanisms that use specialized tissue to generate movement in response to stimuli such as touch, light, temperature, or gravity. Most research in architecture has been focused on the stress-induced bending that can be achieved with a bilayer structure – particularly using wood composites and bi-metals. The speed of these mechanisms is mostly limited by the rules of bilayers, as described by Timoshenko, and the speed of moisture/heat diffusion. This paper presents methods to use bistable mechanisms, and their elastic instability, to enable rapid movements of “snap-through” buckling that can greatly improve the speed of transformation. The research covers biomimetic studies on the Mimosa pudica, Oxalis triangularis, and the Maranta leuconeura to develop hygroscopic mechanisms whose kinematic actuation can be amplified through the integration of a bi- stable system. The presented mechanisms make it possible to significantly increase the speed of response of the hygroscopically driven mechanism while maintaining the ability to operate over several reversible cycles. Calibration of the mechanism to specific relative humidity conditions is presented together with some initial prototypes with the potential for manual override strategies. It is the aim of this combined approach that the actuation mechanisms are better able to match users’ expectations of fast shape-change actuation in relation to environmental changes. |
| keywords |
Stimulus-Responsive, Biomimetics, Hygroscopic, Elastic Instability, Actuators |
| series |
eCAADe |
| email |
|
| full text |
 file.pdf (1,282,973 bytes) |
| references |
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| last changed |
2024/04/22 07:10 |
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