Linear control of the flywheel inverted pendulum.
The flywheel inverted pendulum is an underactuated mechanical system with a nonlinear model but admitting a linear approximation around the unstable equilibrium point in the upper position. Although underactuated systems usually require nonlinear controllers, the easy tuning and understanding of linear controllers make them more attractive for designers and final users. In a recent paper, a simple PID controller was proposed by the authors, leading to an internally unstable controlled plant. To achieve global stability, two options are developed here: first by introducing an internal stabilizing controller and second by replacing the PID controller by an observer-based state feedback control. Simulation and experimental results show the effectiveness of the design.
Departamento de Electrónica, Universidad Técnica Federico Santa María, Valparaíso, Chile. Electronic address: manuel.olivares@usm.cl.
Manuel
M
Olivares
Instituto de Automática e Informática Industrial, Universitat Politècnica de València, València 46022, Spain. Electronic address: pedro@aii.upv.es.
Pedro
P
Albertos
Internal instability; Inverted pendulum; PID control design; Underactuated systems