Stair Ascent Phase-Variable Control of a Powered Knee-Ankle Prosthesis.
Stair Ascent Phase-Variable Control of a Powered Knee-Ankle Prosthesis.
复制标题
楼梯上升的相位变量控制权的膝盖骨骼假体。
DOI:
10.1109/icra46639.2022.9811578
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发表时间:
2022-05
期刊:
影响因子:
--
通讯作者:
Gregg, Robert D.
中科院分区:
文献类型:
--
作者:
Cortino, Ross J.;Bolivar-Nieto, Edgar;Best, T. Kevin;Gregg, Robert D.
Passive prostheses cannot provide the net positive work required at the knee and ankle for step-over stair ascent. Powered prostheses can provide this net positive work, but user synchronization of joint motion and power input are critical to enabling natural stair ascent gaits. In this work, we build on previous phase variable-based control methods for walking and propose a stair ascent controller driven by the motion of the user’s residual thigh. We use reference kinematics from an able-bodied dataset to produce knee and ankle joint trajectories parameterized by gait phase. We redefine the gait cycle to begin at the point of maximum hip flexion instead of heel strike to improve the phase estimate. Able-bodied bypass adapter experiments demonstrate that the phase variable controller replicates normative able-bodied kinematic trajectories with a root mean squared error of 12.66° and 2.64° for the knee and ankle, respectively. The knee and ankle joints provided on average 0.39 J/kg and 0.21 J/kg per stride, compared to the normative averages of 0.34 J/kg and 0.21 J/kg, respectively. Thus, this controller allows powered knee-ankle prostheses to perform net positive mechanical work to assist stair ascent.
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DOI:
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