Comments on ‘Second-order system models of high-order plants’

Abstract

Pachter et al. (1994) proposed a new method for parameters estimation of second-order dynamical system models of high-order real plants based on knowledge of the theoretical transient time T_u (onset delay, OD) and the slope of the inflection tangent y_n′(t_i) (onset rate, OR) of experimental unit step responses (USRs). However, two equations in the paper are shown to be incorrect. Therefore, in this note we present the correct expressions for characteristic quantities of an alternative parametrization of the second-order system with ξ > 1.

Additional information

Notes on contributors

BOHUMIL JAKEŠ

Tel.: [phone]; e-mail: [email protected]; [email protected]

RADEK STRNAD

Tel.: [phone]; e-mail: [email protected]; [email protected]