This paper addresses complex, variable-order fractional derivatives, enlarging the definitions for the real case. Implementations combining discretised Crone approximations using fuzzy logic and interpolation are also addressed.
H 2 and H ∞ controllers minimise the H 2 or the H ∞ norm of a suitable loop transfer function involving the plant to control and some weighing transfer functions chosen to fulfil performance specifications. In this paper this type of controllers is developed for the case when the plant and / or the weighing transfer functions are of fractional… (More)
This paper focuses on the optimization of the electric energy production by photovoltaic cells through the development of an intelligent sun-tracking system. The developed tracking system is innovative in relation to the usual sun tracking systems available in the market. In fact, the developed solution has many advantages in relation to similar existing… (More)
This paper details two control approaches for a flexible manipulator system, where the non-minimum phase problem is treated. In the first approach, we use the motion planning technique. It searches for proper output trajectories with polynomial form, in order to cancel the effects of the unstable zeros. The second approach is called Path-Following with… (More)