A Review of SOPTD/FOPTD Frequency Domain Analysis

Aldo Balestrino and Emanuele Crisostomi


Identification procedure, second order plus time delay systems, frequency response


In this paper a new frequency-domain identification procedure is presented for second order plus time-delay (SOPTD) systems, from the knowledge of the frequency response. The main contribution is that a new parameter, namely a frequency ratio, is proposed for a systematic estimation of the damping coefficient, as such a parameter is independent of the other unknowns. The approach is the dual of a recent approach in the time domain, based on the use of the shape factor.

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