In this paper we introduce a new method to design control laws for nonlinear, underactuated systems. Our method produces an infinite-dimensional family of control laws, whereas most control techniques only produce a finite-dimensional family. These control laws each come with a natural Lyapunov function. The inverted pendulum cart is used as an example. In addition, we construct an abstract system that is open-loop unstable and cannot be stabilized using any linear control law and demonstrate that our method produces a stabilizing control law.
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Auckly et al. (2000) studied this question.