Computer aided dynamic simulation of polycentric above-knee prosthesis.
Date of Issue1999
School of Mechanical and Aerospace Engineering
Effective restoration of walking and standing of handicapped humans is an important element which improves their quality of life. To meet such a need, the mechanical substitute or prosthesis must provide support and stability as well as behave like a normal limb for various activities. This thesis presents the study of the effectiveness of an above-knee prosthesis with a four-bar linkage polycentric knee joint and a magnetorheological damper controller. A kinematic model of human locomotion is described. Using the model, a series of studies on kinematics, inverse dynamics and dynamic analysis are conducted to simulate the gait of an amputee-prosthesis system. Kinematic analysis shows that the motion of the prosthetic shank can be made very close to that of normal walking motion. The stability of the four-bar linkage polycentric knee prosthesis is then analyzed in stance phase. It is shown that such a device has an elevated instantaneous center during weight bearing phase, and a high controllability in maintaining stability.
DRNTU::Engineering::Mechanical engineering::Assistive technology