System Identification with piecewise linear models in the frequency domain – application to an servopneumatic actuator

Abstract

By means of a real world application a system identification method was investigated for nonlinear systems from input-output measurements. This approach is based on a blended multiple model structure, which describes the global behaviour of the system over the whole operating range. Depending on the operating point twenty local linear blackbox models were identified in the frequency domain from a finite number of measurements of the inputs and outputs. A comparative study was made of a model, which have been derived using physical laws [4] and measurements of several process states to estimate unknown parameters.