Abstract:
The Principal Component Analysis (PCA) and the Partial Least Squares (PLS) are
two commonly used techniques for process monitoring. Both PCA and PLS assume
that the data to be analysed are not self-correlated i.e. time-independent.
However, most industrial processes are dynamic so that the assumption of time-
independence made by the PCA and the PLS is invalid in nature. Dynamic
extensions to PCA and PLS, so called DPCA and DPLS, have been developed to
address this problem, however, unsatisfactorily. Nevertheless, the Canonical
Variate Analysis (CVA) is a state-space-based monitoring tool, hence is more
suitable for dynamic monitoring than DPCA and DPLS. The CVA is a linear tool and
traditionally for simplicity, the upper control limit (UCL) of monitoring
metrics associated with the CVA is derived based on a Gaussian assumption.
However, most industrial processes are nonlinear and the Gaussian assumption is
invalid for such processes so that CVA with a UCL based on this assumption may
not be able to correctly identify underlying faults. In this work, a new
monitoring technique using the CVA with UCLs derived from the estimated
probability density function through kernel density estimations (KDEs) is
proposed and applied to the simulated nonlinear Tennessee Eastman Process Plant.
The proposed CVA with KDE approach is able to significantly improve the
monitoring performance and detect faults earlier when compared to other methods
also examined in this study.
