# transient processes

## Numerical modeling transient processes in a long gas pipeline

Unsteady processes of isothermal natural gas flow, emerging in a long pipeline when there is switching-over from one stationary process to another stationary process, have been considered in this paper.  The one-dimensional system of gas dynamics equations is used for that purpose.  It includes equations for conservation of mass and momentum written relative to of dimensionless mass and flow densities.  Three boundary-value problems formulated for this system define three models for control of the transient processes.  The problems differ by the boundary (control) functions imposed at the e

## Modeling Circuit-breaker Ultra-high Voltage for Analysis Transients Processes in Electrical Engineering Systems of Energy Transfer

On the basis of a generalized interdisciplinary (interdisciplinary) method of mathema- tical modeling, which is based on modifications of the integral variational principle of Ha- milton-Ostrogradsky, proposed mathematical model of the ultra-high voltage circuit-breaker the main emphasis of which is placed on modeling work the mechanism of moving his contacts.

## Transient processes in asynchronous electric drive with individual reactive power compensation in case of loss of supply voltage

The article discusses the problem of calculation transient processes in the asynchronous motors with capacitors switched in parallel that work in case of leakage of input voltage. The basis of the algorithm is a mathematical model of asynchronous motor that includes phenomenon of current extrusion in the bars of the rotor and magnetic saturation.

## The harmonic field effects in shaded-pole induction motor

The article discusses the problem of calculation transient processes in the asynchronous motors with capacitors switched in parallel that work in case of leakage of input voltage. The basis of the algorithm is a mathematical model of asynchronous motor that includes phenomenon of current extrusion in the bars of the rotor and magnetic saturation

## High-Speed Computer Simulation of Electrical Circuits

The well-known numerical-analytic method based on zeroes/poles matching (as z-transform realization) of equivalent transfer function or complex impedance (conductivity) in Laplace domain was proposed for high-speed computer analysis of electric circuits’ transients. The advantages of this method were illustrated on simple examples of the computer models of the first order electric circuit (RC-circuit that correspond to real pole) and second order electric circuit (RLC-circuit that correspond to complex pair of poles).