Abstract
The aim of this study is to evaluate the orbital stability for walking with four prosthetic feet at normal and slow speeds. Phase plane portraits, Poincare maps and Floquet multipliers are used in this study. The Flex Foot, SACH foot, Seattle Foot and the optimized foot are taken as the research objects. The results demonstrate that walking with Flex Foot, Seattle Foot and the optimized foot at slow speed always exhibit smaller hip and ankle flexion, compared to walking at normal speed. While the walking speed has no obvious influence on the joint activities for walking with SACH foot. Walking with the four prosthetic feet at different speeds displays the orbital stability.
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