Investigation of inverse simulation for design of feedforward controllers

Abstract

This paper describes the use of inverse simulation to develop feedforward controllers for
model-based output-tracking control system structures, thus avoiding the more complicated
techniques of model inversion. Similarities and shortcomings of the inverse simulation and
model inversion approaches are explored. It is found that, with suitable values of discretized
time interval, the method based on inverse simulation may be preferable for minimum-phase
systems. Depending upon zero redistribution within the process of inverse simulation, nonminimum-
phase problems for linear systems can also be handled. The conclusions are
demonstrated using a non-linear HS125 aircraft model, a linearised Lynx helicopter model and
a container ship model for ship steering control and roll stabilization.