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. Author manuscript; available in PMC: 2014 Dec 29.
Published in final edited form as: IEEE Trans Control Syst Technol. 2014 Jan;22(1):246–254. doi: 10.1109/TCST.2012.2236840

Fig. 4.

Fig. 4

Comparison between steady-state gaits for passive walking, impedance control (PD), and output linearization (linz): output ξ (left), COP x-component (center), and ankle torque (right) over time. Recall that ξ ≡ 0 corresponds to perfect enforcement of the effective shape, which we see with output linearization.