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首页> 外文期刊>Journal of Materials Engineering and Performance >Design of a Telescopic Linear Actuator Based on Hollow Shape Memory Springs
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Design of a Telescopic Linear Actuator Based on Hollow Shape Memory Springs

机译：基于空心形状记忆弹簧的伸缩式直线执行器设计

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摘要

Shape memory alloys (SMAs) are smart materials exploited in many applications to build actuators with high power to mass ratio. Typical SMA drawbacks are: wires show poor stroke and excessive length, helical springs have limited mechanical bandwidth and high power consumption. This study is focused on the design of a large-scale linear SMA actuator conceived to maximize the stroke while limiting the overall size and the electric consumption. This result is achieved by adopting for the actuator a telescopic multi-stage architecture and using SMA helical springs with hollow cross section to power the stages. The hollow geometry leads to reduced axial size and mass of the actuator and to enhanced working frequency while the telescopic design confers to the actuator an indexable motion, with a number of different displacements being achieved through simple on-off control strategies. An analytical thermo-electro-mechanical model is developed to optimize the device. Output stroke and force are maximized while total size and power consumption are simultaneously minimized. Finally, the optimized actuator, showing good performance from all these points of view, is designed in detail.
机译：形状记忆合金（SMA）是在许多应用中开发的智能材料，用于制造具有高功率质量比的执行器。 SMA的典型缺点是：导线显示不良的行程和过长的长度，螺旋弹簧的机械带宽有限且功耗很高。这项研究的重点是大型线性SMA致动器的设计，该致动器旨在最大程度地增加行程，同时限制整体尺寸和功耗。通过为执行器采用可伸缩的多级结构并使用具有空心横截面的SMA螺旋弹簧为级提供动力，可以实现此结果。中空的几何形状可减小执行器的轴向尺寸和质量，并提高工作频率，而伸缩式设计则使执行器具有可分度运动，通过简单的开关控制策略可实现许多不同的位移。开发了一个分析热电机械模型来优化该设备。输出冲程和力达到最大，同时总尺寸和功耗也达到最小。最后，对经过优化的执行器进行了详细设计，这些执行器从所有这些角度都显示出良好的性能。

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