is aimed to investigate the application of the fuzzy
logic paradigm for the control of dynamic system.
The research carried at L.A.R. is aimed to exploit the linguistic interpretation of the fuzzy paradigm as well as to investigate formal design procedure of the fuzzy control system.
The fuzzy logic controller paradigm proposed is based an extension of the generalized modus ponens using the operations of disjunction and aggregation of fuzzy sets. Some other work investigates a model-based procedure for the synthesis of a fuzzy logic controller. This algorithm defines the linguistic rules of a fuzzy logic controller, starting from a desired closed loop behavior and a plant model, both described via linguistic statements. To obtain a plant model in a linguistic form, suitable for the above algorithm, a novel identification procedure is under development.The application of a fuzzy logic controller to the control of a complex system is carried on in collaboration with the Institute for Earth-Moving Machinery and Off-RoadVehicles (CNR-Cemoter). This work aims to the fuzzy control of variable displacement pump.
This research activity starts from some considerations about similarity between a Variable Structure Control with Boundary Layer and a very simple Fuzzy Logic Controller. From these considerations some properties of VSC (Variable Structure Control) are used, in particular the sliding mode dynamics, for the definition of the rules and the membership functions of a Fuzzy Logic Control.
This works, done in collaboration with Professor H.B. Verbruggen, Mr. R. Babuska and Mr. S. Stramigioli of the Control Laboratory, Delft University of Technology (The Netherlands), address the theoretical analysis of the so-called Takagi-Sugeno fuzzy model. In detail our research is devoted to investigate restrictive criteria for the stability analysis of the fuzzy model. Moreover the more general problem of the interpolation of complex non-linear dynamic process using simple linear homogeneous and non-homogeneous subsystem is also considered.
This applicative research aims
to investigate the potentiality of the fuzzy logic controller coupled
with a standard PID algorithm. The control structure is formed by a PID
servo--controller which parameters are tuned on--line by a supervisor
designed using fuzzy logic paradigm.
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