A simple bipedal model for studying control of gait termination

A simple bipedal model for studying control of gait termination
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用于研究步态终止控制的简单双足模型

DOI:
10.1088/1748-3190/aaae8e
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发表时间:
2018
影响因子:
3.4
通讯作者:
Hartmut Geyer
Hartmut Geyer
中科院分区:
计算机科学3区
文献类型:
--
作者:
Yasuyuki Suzuki;Hartmut Geyer

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我们研究了一个简单的双足运动模型的人类步态终止的控制。已经提出了几种控制策略的步态终止。然而,这些策略的相对重要性尚未在人类步态模型中进行评估。在这里,我们扩展了双足弹簧质量步行模型中的最少参数的方式和研究三个明确的控制策略步态终止,包括缩短的最后一步,制动在脚踝,并延长膝盖。分别应用这些策略,我们发现只有在脚踝处制动才能减少足够的推进力,以过渡到安静的站立。结合其他两种策略,我们观察到,适合步态终止的控制参数的范围增加,特别是当踝关节控制间歇性地应用,利用被动稳定动力学。我们进一步表明,由此产生的模型行为是兼容的几个实验观察人体质心动力学和腿部力量在步态终止,并讨论模型的改进,以纠正不匹配。所提出的模型可以作为一个起点,更先进的模型,可以提供更深入的了解人类的控制策略,在步态终止。
We study the control of human gait termination with a simple bipedal locomotion model. Several control strategies have been proposed for gait termination. However, the relative importance of these strategies has not been evaluated in models of human gait. Here we extend the bipedal spring mass walking model in a least parameter fashion and study three explicit control strategies for gait termination, including the shortening of the final step, braking at the ankle, and extending the knee. Applying the strategies separately, we find that only braking at the ankle reduces the propulsive force enough to transition into quiet standing. In combination with the other two strategies, we observe that the range of control parameters suitable for gait termination increases, especially when the ankle control is applied intermittently by taking advantage of passive stabilizing dynamics. We further show the resulting model behavior is compatible with several experimental observations about the human center of mass dynamics and leg forces during gait termination, and discuss model improvements to correct mismatches. The proposed model may serve as a starting point for more advanced models that can provide a deeper understanding of human control strategies during gait termination.
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