Title :
Comments about frequency response plots of Keller and Anderson and Rattan
Author_Institution :
Inst. of Autom. Control, Silesian Tech. Univ., Gliwice, Poland
Abstract :
It is noticed that the method of comparison of frequency responses by using the Nyquist plots of the closed-loop system spectral transfer functions, applied in Keller-Anderson (ibid. vol.37, no.2, p.214-23 (1992)) and Rattan (ibid. vol.AC-29, p.282-5 (1984)), is not appropriate. Namely not only the shape of these plots but also the frequency distribution on them must be taken into account. It is shown that significantly more legible is utilization of the Bode plots of the control index presented by Findeison (1978) which has a good physical insight.<>
Keywords :
Bode diagrams; Nyquist diagrams; closed loop systems; frequency response; performance index; transfer functions; Bode plots; Nyquist plots; closed loop system; control index; frequency distribution; frequency response plots; spectral transfer functions; Automatic control; Control systems; Frequency response; Shape; Steady-state; Transfer functions;
Journal_Title :
Automatic Control, IEEE Transactions on
