Blending of Uncertain Nonminimum-Phase Plants for Elimination or Reduction of Nonminimum-Phase Property.

摘要

The benefits of feedback achievable in nonminimum-phase (NMP) systems are severely limited. However, if there are two parallel NMP branches whose outputs can be measured, then it may be possible to eliminate or reduce the NMP property with respect to some parts of the system, even if each of the two branches has uncertain parameters. It is always possible to do so for a finite, nonzero range of uncertainties for any complexity of pole-zero patterns of the branches. A design philosophy and methodology is presented for the general problem, permitting one to approach an optimum solution, under various constraints. (Author)