In this study, the following design parameters of above-knee prosthesis are considered assuming that the knee joint is semi-actively controlled : mass, center of mass and moment of inertia of total shank and foot.
For the optimal solution, governing equation is discretized by the 4th order Runge-Kutta integration algorithm and design sensitivity analysis is treated. Time-variant damping coefficients, stiffnesses of linear spring and bumper spring are resolved by the particular method.
Best prosthetic gait in the swing phase is obtained through increasing the mass and moving the CG proximally and increasing the moment of inertia. But the position of the CG have the greatest effect on prosthetic gait. Conclusionally moving only the CG is the best design in the several aspect.
