On-line monitoring of unequal length batch processes based on the Hausdorff distance

In some industrial situations, the classical assumption used in the batch process monitoring that all batches have equal durations and are synchronized does not hold. In these cases, data analysis from process for performing the multivariate statistical process control can be difficult. Three different innovative methods for the on-line monitoring of batch processes with varying durations, all based on the Hausdorff distance are presented. These methods have been successfully tested on a simulated example. The conclusion is that these methods are able to efficiently discriminate between nominal and non-nominal batches before their completion.