Asymptotic stability Closed loop systems 3 Controllers 3 Uncertainty analysis 3 Adaptive 2 Closed-loop system 2 Control parameters 2 Eigenvalues and eigenfunctions 2 External loads 2 Human robot interaction 2 Humans-robot interactions 2 Impedance controllers 2 Intelligent robots 2 MRAC 2 Manipulators 2 Model reference adaptive control 2 Model-reference adaptive controls 2 Sliding mode control 2 Structural parameter 2 Structure parameter 2 Time varying 2 Time varying control systems 2 adaptive 2 human–robot interaction 2 intelligent control 2 time-varying 2 Adaptive control systems 1 Adaptive predictions 1 Adaptive sliding mode control 1 Autonomous dynamical system 1