Compliant Interaction Control of Lower-Limb Exoskeletons Via Fractional-Order Admittance and Phase-Modulated Proximal Policy Optimization
Lower-limb rehabilitation exoskeletons must track motion while accommodating user-generated interaction torque. This study evaluates a fractional-order admittance outer loop in which six joint-specific mass, damping, and stiffness coefficients and two shared derivative orders are adjusted by proximal policy optimizatio...