The approximation of the plant's step response is still the most traditional way for plant's dynamics modeling. In the paper some methods for step responses approximation are examined. The aim of this examination is to make some conclusions about using the plant models for controllers tuning. The comparative analysis is based on examples and simulations.

In this paper, the problem of numericaly mining the steady-state in asinchronous mashines is considered. Based on a appropriate mathematic model the original problem is reduced to a system of four nonlinear algebraic equations. The solution of the latter system is obtained using an efficient interval method which guarantees convergence and ...