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Normal forms for underactuated mechanical systems with symmetry

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1 Author(s)
Olfati-Saber, R. ; Dept. of Control & Dynamical Syst., California Inst. of Technol., Pasadena, CA, USA

We introduce cascade normal forms for underactuated mechanical systems that are convenient for control design. These normal forms include three classes of cascade systems, namely, nonlinear systems in strict feedback form, feedforward form, and nontriangular quadratic form (to be defined). In each case, the transformation to cascade systems is provided in closed-form. We apply our results to the Acrobot, the rotating pendulum, and the cart-pole system

Published in:

Automatic Control, IEEE Transactions on  (Volume:47 ,  Issue: 2 )