Olga Slita

Identification of Frequency of Biased Harmonic Signal

We consider a problem of identification of unknown frequency of a biased sinusoidal signal y(t) = σ0 + σ sin(ωt + φ) + δ(t) with bounded disturbance or harmonic noise δ(t). A new proposed approach to estimation of frequency of biased sinusoidal signal is robust with regard to unaccounted disturbances, which are present in measurement of effective signal. Unlike known analogs, this approach allows to regulate time of estimation of unknown frequency ω. The proposed approach also allows online amplitude and bias estimation. The proposed identification algorithm has smaller dimension than other known analogs.

Identification of frequency of biased harmonic signal

Abstract The paper is dedicated to problem of identification of unknown frequency of a biased sinusoidal signal y(t) = σ 0 + σ sin(ω t +). A new proposed approach to estimation of frequency of biased sinusoidal signal is robust with regard to unaccounted disturbances, presenting in measurement of effective signal. Unlike known analogs, this approach allows to regulate time of estimation of unknown frequency ω. The proposed approach also allows online amplitude and bias estimation. Dimension of the proposed identification algorithm is less than known analogs have.

NI ELVIS II in the concept of cognitive and active learning technologies

This paper describes the role of NI software and hardware in the implementation of actual learning technologies and the applying of a unified educational platform NI ELVIS II and NI LabView software for active learning technologies in the cognition of professional cycle disciplines.

The New Algorithm of Sinusoidal Signal Frequency Estimation

In this paper we consider the new estimation algorithm of the measured sinusoidal signal frequency. Unlike most of known similar methods, the proposed algorithm provides the opportunity of partial rejection of unaccounted disturbances presenting in the channel of useful signal measurement. The latter in its turn allows obtaining more accurate estimation of unknown frequency of the measured sinusoidal signal.

ADAPTIVE OBSERVER DESIGN FOR CHAOTIC DUFFING SYSTEM

Abstract Problem of unknown encoded parameter reconstruction is solved by means of procedure of design of adaptive observer for chaotic Duffing system. Unlike known analogues, the problem in question is only solved using measurements of output of chaotic system and in conditions of full parametrical uncertainty.

Algebraic Conditions of Generalized Modal Control

Abstract We search for algebraic conditions of generalized modal control feasibility. This kind of control ensures desired structures of eigenvalues and eigenvectors of the closed-loop system. Possible areas of generalized modal control application are indicated.

Design of Modal Control Providing Guaranteed Stability Margin to Continuous Systems

Abstract In this paper the problem of modal control design providing required quality indices and guarantied phase stability margin is considered.

Algebraic problems of parametric invariance: analytical potentialities of trajectory sensitivity tools

In this paper we consider a plant with parametric uncertainties and its trajectory sensitivity model. This simultaneous consideration allows us to propose algebraic conditions of output invariance of the closed-loop system which includes the plant. An example is given.

Frequency Identification of Biased Harmonic Disturbance

Abstract The paper is dedicated to problem of unknown frequency identification of an unmeasured biased harmonic disturbance affecting a nonlinear system. Unlike known analogues, this approach allows to regulate time of estimation of unknown frequency &ωbar; .

ADAPTIVE CONTROL OF LIBRATION ANGLE OF A SATELLITE

Abstract Analytical conditions and practical methods of their realization are proposed for solving a problem of tracking a command signal for a nonlinear disturbed system. Nonlinear plants which linear part has unknown parameters and nonlinear part and disturbance are bounded and unknown are considered. The paper illustrates a possibility of applications of proposed algorithms to control libration angle of satellite.