在使用混合-SINDy的脚外骨架行走时,基于单个特定模板的质量中心动态表示的变化量化
Michael C Rosenberg1, Joshua L Proctor2,3, Katherine M Steele2
1Department of Mechanical Engineering, University of Washington, Seattle, USA. mcrose3@emory.edu.
Scientific reports
|January 10, 2024
概括
脚外骨在没有受损的成年人中没有改变质量中心 (CoM) 动态,但在中风后的个体中增加了硬度. 混合SINDy确定了与辅助设备的个人特定的CoM动态.
科学领域:
- 生物力学 生物力学
- 机器人技术 机器人技术 机器人技术
- 神经康复疗法 神经康复疗法
背景情况:
- 脚外骨通过改变质量中心 (CoM) 运动来影响行走.
- 了解和建模个体特定的CoM动态,特别是神经损伤后,至关重要但具有挑战性.
- 脚外骨架对CoM动态的影响仍然在很大程度上是未知的.
研究的目的:
- 评估 CoM 动态的个体特异性变化与无损的成年人和中风后个体的被动脚外骨架.
- 通过使用数据驱动的方法来确定描述CoM动态的最佳,物理可解释的机制 (模板签名).
- 调查 CoM 动态对被动脚外骨的稳定性以及神经损伤的影响.
主要方法:
- 利用非线性动态的混合稀疏识别 (Hybrid-SINDy),一种没有方程的,数据驱动的技术.
- 从没有受损的成年人和一个患有中风后半的个体采集了行走数据,使用鞋子和被动脚外骨架 (零硬和高硬).
- 应用混合SINDy推断稀疏的混合动力学和识别模板签名为COM动作.
主要成果:
- 混合SINDy在没有受损的成年人中发现了弹加载的倒置摆形模板签名,这些模板对于外骨的使用是坚固的 (除了腿部休息长度的轻微变化).
- 在中风后的个体中,腿旋转硬度机制显著增加 (37-50%) 与零硬度外骨.
- 没有受损个体的CoM动态显示出对被动脚外骨的弹性,与中风后参与者观察到的变化不同.
结论:
- 个体特异性CoM动态似乎强大到无损的成年人的被动脚外骨架.
- 神经损伤可能会改变脚外骨如何影响CoM动态,需要进一步调查.
- 混合SINDy是一种有前途的工具,用于发现使用辅助设备时个体特定的CoM动态的机制.
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