Comparison of the Reduced Order Controllers

The reduced ordre controllers identified by the cor or cortr instructions may be compared in terms of their frequency responses as well as their closed loop sensitivity functions. The compcon function plots the following curves:

  1. Magnitude of the frequency response of the controllers.
  2. Magnitude of the frequency response of the output sensitivity functions (Syp).
  3. Magnitude of the frequency response of the input sensitivity functions (Sup).
  4. Magnitude of the frequency response of the noise sensitivity functions (Syb).

For the magnitude plots a linear scale is considered for the frequency and dB for the magnitude. The menu of the standard figures of MATLAB are enriched by barmenu module which gives more facilities to add the labels, legend, grid and etc. in the figuers.

A magnitude frequency response of a discrete time transfer function can also be ploted by mbode command.

See: Controller order reduction module .

Help topics.

(file compcon.htm)