走向一种统一的方法,以持续可变的阻抗控制动力假肢的步行速度和倾斜度
Albert J Lee1, Curt A Laubscher1, T Kevin Best1
1Department of Robotics, University of Michigan, Ann Arbor, MI 48109.
概括
本研究介绍了动力假肢的统一阻抗控制模型,通过使用单一连续模型来简化动力假肢的控制,无论是立场还是摆动阶段. 这种方法可以改善各种行走条件下的假肢控制.
科学领域:
- 生物医学工程 生物医学工程
- 机器人技术 机器人技术 机器人技术
- 控制系统 控制系统
背景情况:
- 由于其仿生特性,阻抗控制是动力假肢的首选.
- 当前的方法通常使用单独的模型来定位和摇摆阶段,需要复杂的切换逻辑.
研究的目的:
- 为动力假肢开发一个统一的阻抗控制模型,涵盖整个步行周期.
- 通过在单一连续模型下整合姿势和摆动阶段来改善假肢控制.
主要方法:
- 建议在整个步行周期中使用光滑阻抗参数轨迹的新型控制器.
- 介绍了一个在阻抗参数中表示任务间关系的基本模型.
- 富里埃数列模型阻抗参数的加权和,通过凸式优化优化系数.
主要成果:
- 统一模型成功地复制了有能力的关节扭矩和动力学.
- 实验表明,与混合阻抗动力模型相比,其性能具有竞争力.
- 控制器在不同的步行速度和斜率上有效.
结论:
- 一个更简单,统一的阻抗控制模型可以实现有效的假肢控制.
- 这种方法消除了对独立立场和摆动阶段模型的需求,简化了假肢设计.
- 拟议的方法为先进的假肢控制提供了一个有希望的方向.
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