Siam Charoenseang. Hybrid force/EMG based control system for rehabilitation robot. (). King Mongkut's University of Technology North Bangkok. Central Library. : , 2017.
Hybrid force/EMG based control system for rehabilitation robot
Abstract:
This paper presents a hybrid control system of rehabilitation robot with force and EMG
signals. The proposed control system is implemented on the elbow joint of the 4 DOF universal
exoskeleton. Admittance control method is applied to control this rehabilitation robot. However,
the transient response of the admittance control cloud lead in a large overshoot when the user
moves exoskeleton joint quickly then suddenly stops. Hence, the EMG sensor is used to detect the
muscle contraction and then the force input will be set to zero for improving transient response of
the hybrid controller. Furthermore, the generalized regression neural network (GRNN) is applied for
predicting the static gravity force compensation. The experimental result indicates that the GRNN
can predict the static gravity force with accuracy of 97.32%. Moreover, 83.13% of the transient
response is improved by the utilization of the EMG signal in the hybrid controller.