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首页> 外文期刊>Journal of Physics Communications >Self-propagating miniature device based on shape memory alloy
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Self-propagating miniature device based on shape memory alloy

机译：基于形状记忆合金的自蔓延微型装置

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摘要

The development of novel locomotion mechanisms is beneficial for advancing the field of selfpropagating devices, which are implemented in various civilian and military applications. In this work, we present a purely mechanic, mm-sized autonomous device capable of linear propagation on a smooth, relatively flat surface. The locomotion mechanism is driven by a shape memory alloy (SMA) wire that is connected to a metallic, ring-shaped, bias spring. Periodic changes in the temperature in the vicinity of the device activate theSMAwire, and result in alternating contraction-elongation deformations of the SMA-bias spring assembly. These deformations are transferred to a linear back and forth motion of small legs that are attached at the bottom of the ring. To generate locomotion, the general conditions for obtaining asymmetric friction between needle shaped legs and a smooth surface were formulated and validated experimentally. The structure and performance of the device are modeled analytically leading to basic design rules that are validated experimentally by real-time optical tracking of the device's displacements and propagation. In addition, the potential of miniaturization of the presented locomotion concept down to the micro-meter scale is demonstrated.
机译：新型运动机制的发展有利于推进在各种民用和军事应用中实现的自传播装置的领域。在这项工作中，我们提出了一种纯机械的，毫米大小的自主设备，能够在平滑，相对平坦的表面上线性传播。运动机制由形状记忆合金（SMA）线驱动，该形状记忆合金（SMA）线连接到金属的环形偏置弹簧。设备附近温度的周期性变化会激活SMAwire，并导致SMA偏置弹簧组件的交替收缩伸长变形。这些变形被传递到连接在环底部的小腿的线性来回运动。为了产生运动，制定了获得针状腿和光滑表面之间不对称摩擦的一般条件，并进行了实验验证。对设备的结构和性能进行了分析建模，得出了基本设计规则，这些基本设计规则通过实时光学跟踪设备的位移和传播进行了实验验证。另外，展示了所提出的运动概念最小化到微米尺度的潜力。

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