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
Focusing on the ball double-screw hydraulic knee joint as the research object,this paper analyzes the load driving performance of the hydraulic knee joint.Taking the posture data of the human body such as walking,squa...Focusing on the ball double-screw hydraulic knee joint as the research object,this paper analyzes the load driving performance of the hydraulic knee joint.Taking the posture data of the human body such as walking,squatting and landing buffer as initial learning objects,motion features are extracted.By simplifying the trajectories of different motion actions into key feature control points and flexible trajectory fitting,the trajectory of joint actions is optimized.This method can realize the adaptability of the hydraulic robot knee joint in different movements,and take the flexible action as the optimization goal under the condition of ensuring the movement performance,so as to reduce the damage to the knee joint caused by the foot impact in motion.The simulation model was built by Adams and Matlab to complete the performance analysis and motion optimization experiment of the knee joint.The simulation results show that the foot impact force of the experimental model decreases gradually through optimization.Finally,the method is applied to the hydraulic joint experimental prototype to prove its load capacity and flexible motion control performance.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 by the Top Discipline Plan of Shanghai Universities-Class I,the National Natural Science Foundation of China(52205279)the China National Postdoctoral Program for Innovative Talents(BX20190242)+1 种基金the Open Foundation of the State Key Laboratory of Fluid Power and Mechatronic Systems(GZKF-202017)the Open Foundation of the National Engineering Technology Research Center for Prefabrication Construction in Civil Engineering(2021CPCCE-K02).
文摘Focusing on the ball double-screw hydraulic knee joint as the research object,this paper analyzes the load driving performance of the hydraulic knee joint.Taking the posture data of the human body such as walking,squatting and landing buffer as initial learning objects,motion features are extracted.By simplifying the trajectories of different motion actions into key feature control points and flexible trajectory fitting,the trajectory of joint actions is optimized.This method can realize the adaptability of the hydraulic robot knee joint in different movements,and take the flexible action as the optimization goal under the condition of ensuring the movement performance,so as to reduce the damage to the knee joint caused by the foot impact in motion.The simulation model was built by Adams and Matlab to complete the performance analysis and motion optimization experiment of the knee joint.The simulation results show that the foot impact force of the experimental model decreases gradually through optimization.Finally,the method is applied to the hydraulic joint experimental prototype to prove its load capacity and flexible motion control performance.
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.
