Francisco Salas

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The usual way to guarantee stability of model predictive control (MPC) strategies is based on a terminal cost function and a terminal constraint region. This note analyzes the stability of MPC when the terminal constraint is removed. This is particularly interesting when the system is unconstrained on the state. In this case, the computational burden of the(More)
An ethanol extract prepared from the gametophyte Chilean native moss Sphagnum magellanicum was dried out, weighed and dissolved in distilled water. This extract was then assayed for its antibacterial activity against the G(-) bacteria Azotobacter vinelandii, Erwinia carotovora subsp. carotovora, Enterobacter aerogenes, Escherichia coli, Pseudomonas(More)
The appearance of self-sustained oscillations in high performance AC drives, and in particular, in induction motors whose speed is regulated with the industry standard "eld-oriented control, is a well-documented but little understood phenomenon. It is well known that the oscillations may be quenched by returning the outer-loop PI speed control, but no(More)
In this paper, we present a new mechanism, named the oscillation killer (OSKIL), intended for extinguish limit cycles that may occur as a consequence of: unexpected external disturbances, interactions with the environment, changes in systems set-points and physical parameters, etc. Examples rate from controlled systems with friction, to electrical networks(More)
Brushless DC (BLDC) servomotors have become a popular choice when implementing high–precision position controllers for mechatronic systems. A motor of this kind requires a drive that can be configured in different operation modes, according to the internal controllers it utilizes. This paper first describes the main features and the complete(More)
Predictive control of nonlinear systems subject to output and input constraints is considered. A fuzzy model is used to predict the future behavior. Three new ideas are proposed here. First, an added constraint on the applied control action is used to ensure the decrease of a quadratic Lyapunov function, and so guarantee Lyapunov exponential stability of(More)