跳跃的
微尺度化学
机器人
计算机科学
灵活性(工程)
材料科学
仿生学
功率(物理)
机器人运动
屈曲
跳跃
纳米技术
移动机器人
人工智能
物理
机器人控制
生物
复合材料
数学教育
统计
量子力学
生理学
数学
作者
Yongjin Kim,Jay van den Berg,Alfred J. Crosby
出处
期刊:Nature Materials
[Springer Nature]
日期:2021-02-01
卷期号:20 (12): 1695-1701
被引量:84
标识
DOI:10.1038/s41563-020-00909-w
摘要
Snap-through buckling is commonly used in nature for power-amplified movements. While natural examples such as Utricularia and Dionaea muscipula can autonomously reset their snapping structures, bio-inspired analogues require external mediation for sequential snap events. Here we report the design principles for self-repeating, snap-based polymer jumping devices. Transient shape changes during the drying of a polymer gel are exploited to generate mechanical constraint and an internal driving force for snap-through buckling. Snap-induced shape changes alter environmental interactions to realize multiple, self-repeating snap events. The underlying mechanisms are understood through controlled experiments and numerical modelling. Using these lessons, we create snap-induced jumping devices with power density outputs (specific power ≈ 312 W kg−1) that are similar to high-performing jumping organisms and engineered robots. These results provide the demonstration of an autonomous, self-repeating, high-speed movement, marking an important advance in the development of environmental energy harvesting, high-power motion that is important for microscale robots and actuated devices. Elastomers swollen with solvent repeatedly snap back and forward as the solvent evaporates, which is harnessed to fabricate polymeric devices that jump autonomously.
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