Design of Shape Memory Alloy Coil Spring Actuator for Improving Performance in Cyclic Actuation.
Design of Shape Memory Alloy Coil Spring Actuator for Improving Performance in Cyclic Actuation.
复制标题
形状内存合金线圈弹簧驱动器的设计，用于改善环状致动的性能。
DOI：
10.3390/ma11112324
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发表时间：
2018-11-19
期刊：
影响因子：
--
通讯作者：
Koh JS
中科院分区：
文献类型：
--
作者：
Koh JS
形状记忆合金(SMA)螺旋弹簧驱动器作为一种人工肌肉，其循环驱动性能与线圈几何结构的机械设计密切相关。为了提高形状记忆合金螺旋弹簧驱动器的工作频率和效率，提出了一种实用的设计方法，通过设计具有大指数(线圈直径/钢丝直径)和螺距角(LIP)的形状记忆合金螺旋弹簧，可以改善冷却特性(提高驱动频率)和获得大变形。LIP设计过程基于两状态静态模型，该模型描述了SMA螺旋弹簧在两种状态下的位移-力关系-完全奥氏体相和完全马氏体相。设计过程给出了满足行程和作用力要求的形状记忆合金螺旋弹簧驱动器的精确设计参数。包括应力诱导去孪生的形状记忆合金线圈的完全马氏体相模型允许使用形状记忆合金的最大剪切应变。该设计方法在不改变行程的情况下减小了形状记忆合金的质量，提高了功率密度和效率。循环驱动实验表明，唇型设计使SMA线圈驱动器的最大频率提高了一倍，质量是非唇型设计的六分之一。
Performance of the shape memory alloy (SMA) coil spring actuator in cyclic actuation as an artificial muscle is strongly related to the mechanical design of the coil geometry. This paper proposes a practical design method for improving the frequency and efficiency of the SMA coil spring actuator; by designing the SMA coil spring to have large index (coil diameter/wire diameter) and pitch angle (LIP), cooling characteristics can be improved (increasing the actuation frequency) and large deformation can be obtained. The LIP design process is based on the two-state static model that describes the displacement-force relationship of the SMA coil spring in two states—a fully austenite phase and a fully martensite phase. The design process gives accurate design parameters of the SMA coil spring actuator that satisfy the required stroke and force. The model of the fully martensite phase of the SMA coil that includes the stress-induced detwinning enables the use of maximum shear strain of the SMA. The design method reduces the mass of an SMA without changing the stroke and increase the power density and efficiency. The cyclic actuation experiments demonstrate that the LIP design doubles the maximum frequency of SMA coil actuator with one-sixth the mass of the non-LIP design.
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影响因子：
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作者：
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