The above-knee intelligent bionic leg is very helpful to amputees in the area of rehabilitation medicine. This paper first introduces the functional demand of the above-knee prosthesis design. Then, the advantages of ...The above-knee intelligent bionic leg is very helpful to amputees in the area of rehabilitation medicine. This paper first introduces the functional demand of the above-knee prosthesis design. Then, the advantages of the four-bar link mechanism and the magneto-rheological （MR） damper are analyzed in detail. The fixed position of the MR damper is optimized and a virtual prototype of knee joint is given. In the end, the system model of kinematics, dynamics, and controller are given and a control experiment is performed. The control experiment indicates that the intelligent bionic leg with multi-axis knee is able to realize gait tracking of the amputee＇s healthy leg based on semi-active control of the MR damper.展开更多
Existing microprocessor-controlled passive prosthetic knees(PaPKs)and active prosthetic knees(AcPKs)cannot truly simulate the muscle activity characteristics of the active–passive hybrid action of the knee during the...Existing microprocessor-controlled passive prosthetic knees(PaPKs)and active prosthetic knees(AcPKs)cannot truly simulate the muscle activity characteristics of the active–passive hybrid action of the knee during the normal gait.Differences in EMG between normal and different prosthetic gait for different phases were never separately analyzed.In this study,a novel hybrid active–passive prosthetic knee(HAPK)is proposed and if and how muscle activity and kinematics changes in different prosthetic gait are analyzed.The hybrid hydraulic-motor actuator is adopted to fully integrate the advantages of hydraulic compliance damping and motor efficiency,and the hierarchical control strategy is adopted to realize the adaptive predictive control of the HAPK.The kinematic data and EMG data of normal gait and different prosthetic gait were compared by experiments,so as to analyze the changes in the muscle activity and spatio-temporal data per phase compared to normal walking and the adaptations of amputees when walking with a different kind of prosthesis(the mechanical prosthesis(MePK),the PaPK and the HAPK).The results show that changes in prosthetic gait mainly consisted of decreased self-selected walking speed,gait symmetry and maximum knee flexion,increased first double support phase duration,muscle activation in both opposed and prosthetic limb and inter-subject variability.The differences between controls and MePK,PaPK and HAPK decreases sequentially.These results indicate that the hybrid active–passive actuating mode can have positive effects on improving the approximation of healthy gait characteristics.展开更多
Master-slaver dual-leg coordination control was proposed for the biped robot with heterogeneous legs(BRHL),in order to reduce gait planning and to get a good tracking performance.The key to coordination is gait trajec...Master-slaver dual-leg coordination control was proposed for the biped robot with heterogeneous legs(BRHL),in order to reduce gait planning and to get a good tracking performance.The key to coordination is gait trajectory tracking control.Bionic knee joint with closed-chain 4links makes robot walking more humanlike,but the model is complex and tracking of the bionic leg to the artificial leg is more difficult.P-type open-closed-loop iterative learning control(ILC)is not based on model parameters and has advantages in both open-loop and closed-loop ILC;so this paper proposes a complex robot gait trajectory tracking.The convergence is proved by using functional analysis and the stability condition is given.A tracking simulation based on the virtual prototype was done.The results show that this control strategy and algorithm are effective and robust,and the convergence speed is better than separate open-loop or closed-loop ILC.展开更多
基金supported by China Postdoctoral Science Foundation(No. 20080441093)Key Laboratory Foundation of Liaoning Province(No. 2008S088)Postdoctoral Science Foundation of Northeastern University (No. 20080411)
文摘The above-knee intelligent bionic leg is very helpful to amputees in the area of rehabilitation medicine. This paper first introduces the functional demand of the above-knee prosthesis design. Then, the advantages of the four-bar link mechanism and the magneto-rheological （MR） damper are analyzed in detail. The fixed position of the MR damper is optimized and a virtual prototype of knee joint is given. In the end, the system model of kinematics, dynamics, and controller are given and a control experiment is performed. The control experiment indicates that the intelligent bionic leg with multi-axis knee is able to realize gait tracking of the amputee＇s healthy leg based on semi-active control of the MR damper.
基金supported in part by the National Natural Science Foundation of China under Grant 62073224the National Key Research and Development Program of China under Grant 2018YFB1307303the program of China Scholarships Council under Grant 202108310200.
文摘Existing microprocessor-controlled passive prosthetic knees(PaPKs)and active prosthetic knees(AcPKs)cannot truly simulate the muscle activity characteristics of the active–passive hybrid action of the knee during the normal gait.Differences in EMG between normal and different prosthetic gait for different phases were never separately analyzed.In this study,a novel hybrid active–passive prosthetic knee(HAPK)is proposed and if and how muscle activity and kinematics changes in different prosthetic gait are analyzed.The hybrid hydraulic-motor actuator is adopted to fully integrate the advantages of hydraulic compliance damping and motor efficiency,and the hierarchical control strategy is adopted to realize the adaptive predictive control of the HAPK.The kinematic data and EMG data of normal gait and different prosthetic gait were compared by experiments,so as to analyze the changes in the muscle activity and spatio-temporal data per phase compared to normal walking and the adaptations of amputees when walking with a different kind of prosthesis(the mechanical prosthesis(MePK),the PaPK and the HAPK).The results show that changes in prosthetic gait mainly consisted of decreased self-selected walking speed,gait symmetry and maximum knee flexion,increased first double support phase duration,muscle activation in both opposed and prosthetic limb and inter-subject variability.The differences between controls and MePK,PaPK and HAPK decreases sequentially.These results indicate that the hybrid active–passive actuating mode can have positive effects on improving the approximation of healthy gait characteristics.
基金supported by the National Natural Science Foundation of China(Grant No.60475036).
文摘Master-slaver dual-leg coordination control was proposed for the biped robot with heterogeneous legs(BRHL),in order to reduce gait planning and to get a good tracking performance.The key to coordination is gait trajectory tracking control.Bionic knee joint with closed-chain 4links makes robot walking more humanlike,but the model is complex and tracking of the bionic leg to the artificial leg is more difficult.P-type open-closed-loop iterative learning control(ILC)is not based on model parameters and has advantages in both open-loop and closed-loop ILC;so this paper proposes a complex robot gait trajectory tracking.The convergence is proved by using functional analysis and the stability condition is given.A tracking simulation based on the virtual prototype was done.The results show that this control strategy and algorithm are effective and robust,and the convergence speed is better than separate open-loop or closed-loop ILC.
