Abstract
Things as actuator dynamics in the model description. In this paper we discuss .the partial feedback lin- earization control of underactuated mechanical sys- tems. We consider an n degree of freedom system having m actuated, or active, degrees of freedom and B = n - m unactuated, or passive, degrees of freedom. It is known that the portion of the dynamics corre- sponding to the active degrees of freedom may be lin- earized by nonlinear feedback. In this paper we show, alternatively, that the portion of the dynamics corre- sponding to the passive degrees of freedom may be lin- earized by nonlinear feedback under a condition that we call Strong Inertial Coupling. We derive and ana- lyze the resulting zero dynamics which are crucial to an understanding of the response of the overall system. Simulation results are presented showing the perfor- mance of two link underactuated robots under partial feedback linearization control.

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