Stability Analysis of Control Systems with the Asymmetric Controllers using Frequency Domain Criterion

Abstract

The stability of control systems with the linear plants using asymmetric Proportional and Proportional-asymmetric Integral controllers is analyzed in this work. The methods of nonlinear systems stability analysis based on the frequency domain criterion proposed by Popov and modified by the Cho and Narendra were employed. They are dedicated for the systems with the one nonlinear element. The investigation has been performed using Off-Axis and Circle criterions by employing graphical-analytical analysis methods, which were realized using software Mathcad. The obtained analysis results were verified using dynamic systems simulation software Matlab/Simulink. Ill. 6, bibl. 13 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.111.5.358

A Combined Controller for Closed-Loop Control Systems Affected by Electromagnetic Interference

“…It is well known that the derivative (D) term is the most sensitive to electromagnetic interference [ 15 , 16 , 17 ]. Therefore, this term is often excluded in practical applications, i.e., a PI controller is used instead of a PID controller [ 15 , 18 , 19 ]. However, excluding the derivative term worsens the dynamic performance of the control system; because of this, a low-pass filter is often used at the input of the derivative term to suppress noise signals.…”

Microwave Diffraction Dependencies of a Conductor Cylinder Coated with Twelve Glass and Semiconductor Layers on the n-Si Specific Resistivity

“…In the article is presented numerical analysis of two layered metamaterial-glass cylinder. Some important electrodynamical investigations of the semiconductor cylindrical rod and other structures are presented in [10][11][12].…”