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首页> 外文期刊>Journal of Materials Engineering and Performance >Applicability of Shape Memory Alloy Wire for an Active, Soft Orthotic
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Applicability of Shape Memory Alloy Wire for an Active, Soft Orthotic

机译：形状记忆合金线在主动，软矫形中的适用性

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Current treatments for gait pathologies associated with neuromuscular disorders may employ a passive, rigid brace. While these provide certain benefits, they can also cause muscle atrophy. In this study, we examined NiTi shape memory alloy (SMA) wires that were annealed into springs to develop an active, soft orthotic (ASO) for the knee. Actively controlled SMA springs may provide variable assistances depending on factors such as when, during the gait cycle, the springs are activated; ongoing muscle activity level; and needs of the wearer. Unlike a passive brace, an active orthotic may provide individualized control, assisting the muscles so that they may be used more appropriately, and possibly leading to a re-education of the neuro-motor system and eventual independence from the orthotic system. A prototype was tested on a suspended, robotic leg to simulate the swing phase of a typical gait. The total deflection generated by the orthotic depended on the knee angle and the total number of actuators triggered, with a max deflection of 35°. While SMA wires have a high energy density, they require a significant amount of power. Furthermore, the loaded SMA spring response times were much longer than the natural frequency of an average gait for the power conditions tested. While the SMA wires are not appropriate for correction of gait pathologies as currently implemented, the ability to have a soft, actuated material could be appropriate for slower timescale applications.
机译：与神经肌肉疾病有关的步态病理的当前治疗可以采用被动的，刚性的支架。尽管这些提供某些好处，但它们也可能导致肌肉萎缩。在这项研究中，我们检查了退火成弹簧的NiTi形状记忆合金（SMA）线，从而为膝盖形成了活跃的，柔软的矫形器（ASO）。主动控制的SMA弹簧可根据各种因素（例如，在步态周期中何时激活弹簧;或在何时激活弹簧）提供可变的辅助。持续的肌肉活动水平;和佩戴者的需求。与被动支撑不同，主动矫形器可以提供个性化的控制，辅助肌肉，使它们可以更适当地使用，并可能导致对神经运动系统的重新教育并最终脱离矫形器系统。在悬架的机器人腿上测试了原型，以模拟典型步态的摆动阶段。矫形器产生的总挠度取决于膝盖角度和触发的执行器总数，最大挠度为35°。尽管SMA线具有高能量密度，但它们需要大量功率。此外，负载的SMA弹簧响应时间比测试功率条件下平均步态的固有频率长得多。虽然SMA导线不适合当前实施的步态矫正，但具有柔软的驱动材料的能力可能适合较慢的时标应用。

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