Xiaojun Sun

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About

Xiaojun Sun is a leading researcher in the field of robotic prosthetics, with a primary focus on the design, control, and biomechanical enhancement of lower-limb assistive devices. His major contributions center on the development of novel variable transmission series elastic actuators (VT-SEA), which enable robotic prosthetic knees and ankles to dynamically adapt their mechanical properties during ambulation. This innovation addresses a critical limitation of passive prostheses, which cannot replicate the natural biomechanics of able-bodied walking. Sun’s work is exemplified by his design of the SuKnee, a robotic knee prosthesis featuring a slider-crank mechanism that varies the transmission ratio with knee angle, and a complete robotic knee-ankle prosthesis system that integrates both joints for coordinated, adaptive gait. His most-cited paper (17 citations) introduces the VT-SEA concept for robotic prostheses, while subsequent works (12 and 7 citations) detail the system-level design and control of these advanced devices. Through these efforts, Sun is advancing the state of the art in powered prosthetics, moving the field closer to devices that can restore natural, energy-efficient locomotion for individuals with lower-limb amputations.