Feedback control of oxygen uptake during robot-assisted gait
Pennycott, Andrew and Hunt, Kenneth and Coupaud, Sylvie and Allan, David (2010) Feedback control of oxygen uptake during robot-assisted gait. IEEE Transactions on Control Systems Technology, 18 (1). pp. 136-142. ISSN 1063-6536 (https://doi.org/10.1109/TCST.2008.2009465)
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Body-weight-supported robot-assisted devices can be used to promote gait rehabilitation and as exercise tools for neurologically impaired persons such as stroke and spinal-cord-injured patients. Here, we propose a novel feedback-control structure for real-time control of oxygen uptake during robot-assisted gait, in which we use the following methods. 1) A feedback-control structure is proposed, consisting of a dynamic controller operating on target and actual levels of oxygen uptake in order to set a target work rate. Target work rate is achieved by an inner volitional feedback loop which relies on the subject's exercise input. 2) The dynamic oxygen-uptake controller is based on an empirically derived model of the oxygen-uptake dynamics and is synthesized by pole placement. 3) The resulting control system is tested during the robot-assisted treadmill ambulation of five able-bodied subjects. A single linear controller was designed based on identification data from tests with one subject and used for closed-loop control tests with all five subjects. In all cases, the actual oxygen-uptake response closely followed the ideal response as specified by the feedback design parameters. The control of oxygen uptake during body-weight-supported robot-assisted ambulation is feasible in the able-bodied population; the robustness of the system is demonstrated within the class of subjects tested. Further testing is required to validate the approach with neurologically impaired subjects.
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Item type: Article ID code: 41926 Dates: DateEventJanuary 2010PublishedSubjects: Technology > Engineering (General). Civil engineering (General) > Bioengineering Department: Faculty of Engineering > Biomedical Engineering Depositing user: Pure Administrator Date deposited: 05 Nov 2012 16:00 Last modified: 08 Apr 2024 20:14 URI: https://strathprints.strath.ac.uk/id/eprint/41926