ON THE CONTROL OF INTEGRATING AND UNSTABLE PROCESSES WITH TIME DELAY

Annraoi de Paor

   A two stage procedure - stabilization followed by disturbance rejection - is developed for the control of integrating and unstable processes with time delay. A fundamental limit on stabilizability by PID control is overcome. Example responses are characterized by superior damping, along with settling times comparable to those obtained by minimization of integral performance measures. Optimum stability arguments are invoked, based on root locus and Nyquist approaches.

Keywords: time delay, optimum stability, two-stage design, Padé Approximations, Nyquist Analysis

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