Degree Name

BS in Mechanical Engineering


Mechanical Engineering Department


James Widmann


Originating from QL+'s customer requirements, the main technical specifications were to have 80% physiological range of motion, elastic energy return, impact absorption, and no external power sources. Based on the background research conducted and the discussions with experts in the field, the project team decided to focus on designing a prosthetic that focused on plantarflexion and dorsiflexion for a more comfortable gait. The main components of the final design are a hydraulic shock absorber, cam, torsion springs, heel, stopper, and separated keel. The heel, front and back keels, and stopper were manufactured out of carbon fiber. The link, lever, attachment platform, and pivot stand were manufactured out of aluminum. The cam was made out of Delrin.Due to a smaller size of the lever than expected and a torsion spring that wasn’t stiff enough, the maximum plantarflexion was less than the target value. The maximum dorsiflexion was also less than required due to interference between the cam and the heel. Further iterations are recommended.

Available for download on Tuesday, June 14, 2022