Abstract
In this paper is proposed a mathematcial model for simulating the swing phase dynamics of an above-knee prosthesis. The mathematical model of the knee-joint mechanism which can prevent hyperextension and hyperbending is presented by a pseudo potential function. The validity of the model is verified by the comparison of the simulation results with the observed data of human walking. It is revealed from the simulation results that the motions of the above-knee prosthesis during the swing phase of normal walking are primarily determined by the initial velocity of the prosthesis rather than hip torque. The proposed model will be used to check the goodness of above-knee prosthesis to be designed.
