LIMPACT: A Hydraulically Powered Self-Aligning Upper Limb Exoskeleton

被引：132
作者：
Otten, Alexander [1 ]
Voort, Carsten [1 ]
Stienen, Arno [1 ,2 ]
Aarts, Ronald [3 ]
van Asseldonk, Edwin [1 ]
van der Kooij, Herman [1 ]
机构：
[1] Univ Twente, Lab Biomech Engn, NL-7522 Enschede, Netherlands
[2] Northwestern Univ, Neuro Imaging & Motor Control Lab, Chicago, IL 60611 USA
[3] Univ Twente, Lab Mech Automat, NL-7522 Enschede, Netherlands
来源：
IEEE-ASME TRANSACTIONS ON MECHATRONICS | 2015年 / 20卷 / 05期
关键词：
Compensation; hydraulic systems; modeling; predictive control; robots; CARTESIAN IMPEDANCE CONTROLLER; FLEXIBLE-JOINT ROBOTS; MOTOR IMPAIRMENT; ARM EXOSKELETON; DESIGN; SHOULDER; REHABILITATION; TORQUE; COORDINATION; ACTUATORS;
D O I：
10.1109/TMECH.2014.2375272
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
The LIMPACT is an exoskeleton developed to be used in identifying the reflex properties of the arm in stroke survivors. Information on joint reflexes helps in designing optimal patient specific therapy programs. The LIMPACT is dynamically transparent by combining a lightweight skeleton with high power to weight ratio actuators. The LIMPACT is supported by a passive weight balancing mechanism to compensate for the weight of the exoskeleton and the human arm. Various self-aligning mechanisms allow the human joint axes to align with the axes of the exoskeleton which ensure safety and short don/doff times. The torque-controlled motors have a maximum torque bandwidth of 97 Hz which is required for fast torque perturbations and smooth zero impedance control. The LIMPACT's weight is reduced five times as gravitational forces are lowered using a model-based gravity compensation algorithm. The impedance controller ensures tracking of a cycloidal joint angle reference. A cycloid with an amplitude of 1.3 rd and a maximum velocity of 6.5 rd/s has a maximum tracking error of only 7%. The LIMPACT fulfills the requirements to be used in future diagnostics measurements for stroke patients.
引用
收藏
页码：2285 / 2298
页数：14
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