A compliantly coupled dielectric elastomer actuator using magnetic repulsion
A compliantly coupled dielectric elastomer actuator using magnetic repulsion
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DOI：
10.1063/1.5071439
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发表时间：
2019-01-07
影响因子：
4
通讯作者：
Conn, A. T.
中科院分区：
文献类型：
--
作者：
Cao, C.;Gao, X.;Conn, A. T.
在过去的二十年里，介电弹性体致动器(DEAS)因其大的驱动应变、固有的柔顺性和低成本而引起了越来越多的研究兴趣。圆锥形DEA结构由于其简单的结构和高力/行程驱动而特别吸引人。带有两个拮抗膜的双锥体DEA设计允许主动双向驱动。然而，在现有的双锥数据包络分析中。设计上，这两个薄膜是刚性耦合的，这将它们在周期性电输入下的相对激励响应限制在1800个异相操作。这项工作提出了一个磁耦合的DEA与柔顺耦合的磁斥力。柔顺耦合允许两个独立的输入，具有完全可调的相位差。目前的样机在相移180度时，峰值归一化行程为14%(相对于标称DEA高度)，在0.5赫兹相移00时，两膜之间的归一化线膨胀高达8.3%(相对于标称DEA高度)。这导致了几种新兴的驱动行为，这些行为可能适合于可控的形状变化驱动、主动减振和生物激励运动。由AIP出版公司授权出版。
Dielectric elastomer actuators (DEAs) have attracted growing research interest over the past two decades for their large actuation strain, inherent compliance, and low cost. The conical DEA configuration is particularly attractive thanks to their simple structure and high force/stroke actuation. A double cone DEA design with two antagonistic membranes allows active bidirectional actuation. However, in existing double cone DEA. designs, the two membranes are rigidly coupled, which restricts their relative actuation response under periodic electrical input to 1800 out-of-phase operation. This work presents a magnetically coupled DEA with compliant coupling by a magnetic repulsion. The compliant coupling allows two separate inputs with a fully adjustable phase difference. The current prototype demonstrates a peak normalized stroke of 14% (relative to the nominal DEA height) at a phase shift of 180 degrees and a normalized linear expansion between the two membranes of up to 8.3% (relative to the nominal DEA height) at a phase shift of 00 at 0.5Hz. This results in several emerging actuation behaviors, which could potentially be suitable for controllable shape changing actuations, active vibration damping, and bioinspired locomotion. Published under license by AIP Publishing.