Estimation of Orders and Delay-time of the Process in a Closed-Loop Control System Using ARMA Model

Abstract

The problem of estimating orders and delay-time of the process in a closed-loop control system is investigated in this paper. We have proposed an estimation procedure before, but it needed additive noise to the input part. If the input is noise free, estimation becomes much more difficult because it is hard to understand property of the process instead of the controller. We propose another procedure of estimating orders and delay-time using the fact that the process output can be represented by filtered output of ARMA model. Simulation example will show usefulness of the procedure.