2020 (vol. 30) - Number 4

*A.B. Malinowska, R. Kamocki, R. Almeida, T. Odzijewicz:*

On the existence of optimal consensus control for the fractional Cucker--Smale model

*R. Grymin, W. Bożejko, J. Pempera, M. Wodecki, Z. Chaczko:*

Algorithm for solving the Discrete-Continuous Inspection Problem

*T. Kaczorek, A. Ruszewski:*

Global stability of discrete-time nonlinear systems with descriptor standard and fractional positive linear parts and scalar feedbacks

*R. Arora, K. Gupta:*

Fuzzy goal programming technique for multi-objective indefinite quadratic bilevel programming problem

*P. Nowak, J. Czeczot, P. Grelewicz:*

Tuning rules for industrial use of the second-order Reduced Active Disturbance Rejection Controller

*M.I. Gomoyunov:*

Optimal control problems with a fixed terminal time in linear fractional-order systems

*Muhafzan, A. Nazra, L. Yulianti, Zulakmal, R. Revina:*

On LQ optimization problem subject to fractional order irregular singular systems

*M. Blizorukova, V. Maksimov:*

On one algorithm for reconstruction of an disturbance in a linear system of ordinary differential equations

ACS Abstract:

**2010 (Volume 20)**

Number 2

**Pointwise completeness and pointwise degeneracy of standard and positive hybrid linear systems described by the general model**

T. Kaczorek(Bialystok University of Technology, Bialystok, Poland) |

**keywords:** pointwise completeness, degeneracy, standard, positive, general model, hybrid system

**Continuous-time dynamic system identification with multisine random excitation revisited**

J. Figwer(Silesian University of Technology, Gliwice, Poland) |

**keywords:** continuous-time dynamic system identification, multisine random process, system excitation, signal sampling and reconstruction

**Robust control and modal analysis of flexible rotor magnetic bearings system**

A. Mystkowski(Bialystok University of Technology, Bialystok, Poland) |

**keywords:** active magnetic bearings, uncertainty design, flexible rotor model, bending modes, m-synthesis control, rotor vibrations control

**Exponential stability of networked control systems with network-induced random delays**

D. Krokavec(Technical University of Kosice, Kosice, Slovak Republi) | A. Filasova(Technical University of Kosice, Kosice, Slovak Republi) |

**keywords:** networked systems, stability analysis, time-delay systems, linear matrix inequality, state feedback

**On generalization of integral control to a class of nonlinear uncertain system**

Z. Zwierzewicz(Marine University of Szczecin, Szczecin, Poland) |

**keywords:** nonlinear control, uncertain systems, adaptive control, integral action, approximator, functional uncertainty

**Quasi-optimal PZT distribution in active vibration reduction of the triangular plate with P-F-F boundary conditions**

A. Branski(Technical University of Rzeszow, Rzeszow, Poland) | S. Szela(University of Rzeszow, Rzeszow, Poland) |

The active vibration reduction study with a finite element method (FEM) is carried out. The numerical calculations show that better results are obtained for MC distribution of the PZTs.

**keywords:** triangular plate, PZT (piezoelectric zirconate titanate actuator), P-F-F (partial-free-free) boundary condition, active vibration reduction

**Backstepping/DTC control of a double star synchronous machine drive**

D. Boudana, L. Nezli, A.Tlemcani, M.O. Mahmoudi, M. Tadjine(LCP, Alger, Algeria) | M. Djemai(ECS, ENSEA, Cergy-Pontoise Cedex, France) |

Direct torque control (DTC) allows for very high quality torque control without a need for current controllers tuning or using coordinate transformation. However, barge torque ripples arise as well as inconstant inverter switching frequency due to the hysteresis of comparators. This paper present a backstepping/DTC control based on the space vector modulation (SVPWM) for double star synchronous machine (DSSM) to reduce the torque, flux, current and speed pulsations during steady state. By the coordinate transformation the DSSM models are presented in view of control. Then a conventional DTC is developed to get a decoupled system and a PI controller is designed to control the speed. To improve the static and dynamic control performance of the DSSM, the speed controller is designed using a backstepping/DTC procedure in conjunction with SVPWM. Simulation results with the conventional DTC and proposed backstepping/DTC are presented and compared. Results show the effectiveness and the robustness of the approach proposed.

**keywords:** double star synchronous machine, direct torque control, backstepping/DTC, space vector modulation, robustness

**Reachability of linear hybrid systems described by the general model**

T. Kaczorek, K. Rogowski(Bialystok University of Technology, Poland) |

examples.

**keywords:** reachability, standard, positive, general model, hybrid system, piecewise constant control

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