Această lucrare tratează problema conducerii robuste a sistemelor liniare cu incertitudine cu argument întârziat ce conţin elemente de execuţie cu saturaţie. Utilizând fundamente teoretice, cum ar fi teoria Razumikhin cu privire la stabilitatea sistemelor cu incertitudine cu argument întârziat, teoria Lyapunov a stabilităţii ecuaţiilor diferenţiale funcţionale, tehnici de optimizare via inegali...

In the field of management, the delay within projects is a prominent and contentious issue. Due to the fact that delay leads to cost and time over-runs, it is often the subject of litigation claims and creation of managerial tensions. In a bid to bring such delays under control and also to diminish managerial tensions, it is necessary to recognize and understand the following four concepts:"typ...

In technical practice often occur higher order processes when a design of an optimal controller leads to complicated control algorithms. One of possibilities of control of such processes is their approximation by lower-order model with time-delay (dead time). One of the possible approaches to control of dead-time processes is application of predictive control methods. The paper deals with desig...

The concept of control Lyapunov functions (CLF) has recently been extended to time delay system in the form of control Lyapunov-Razumikhin functions (CLRF) and control Lyapunov-Krasovsky functionals (CLKF). If a CLKF is known for a nonlinear time delay system, several stabilizing control laws can be constructed using one of the universal formulas derived for CLF’s. In this paper we establish a ...

Ecole Superieure d’Eletricité SUPELEC Systems Sciences (E3S) Automatic Control Department and Laboratory of Signals and Systems, CNRS-SUPELEC Doctor of Sciences in Physics by Warody Claudinei Lombardi The main interest of the present thesis is the constrained control of time-delay system, more specifically taking into consideration the discretization problem (due to, for example, a communicatio...

It is well-known that if the steady-state gain G(0) of a stable lumped system, with transfer function G(s), is positive, then compensating the system by an integral controller k=s, where k is a gain parameter, leads to a stable closed-loop system which achieves tracking of arbitrary constant reference signals, provided that the gain parameter k is positive and su ciently small. It is also well-...

In this paper, a new approach based on embedding method for finding an approximate solution for a wide range of nonlinear optimal control problems with delays in state and control variables subject to mixed-control state constraints is introduced. First, the problem is transformed to a new optimal measure problem which is an infinite dimensional linear programming problem and then this new prob...

project participants are becoming more aware of the high costs and risks associated with delay claims and their litigation. among delays, weather delay has an important role in projects performed in severe environmental conditions. this research is the extension of delay analysis techniques by approving analysis of weather delays using fuzzy logic. at the presented technique, first using a fuzz...