Multiple model based soft sensor development with irregular/missing process output measurement

In this paper, nonlinear soft sensor development with irregular/missing output data is considered and a multiple model based modeling scheme is proposed for nonlinear processes. The efficiency of the proposed algorithm is demonstrated through several numerical simulation examples as well as the experimental data collected from a pilot-scale setup. It is shown through the comparison with the traditional missing data treatment methods in terms of the parameter estimation accuracy that, the developed soft sensors enjoy improved performance by employing the expectation-maximization (EM) algorithm in handling the missing process data and model varying problem.