Operation
❯
Predictive Maintenance
❯Machine learning-driven analysis of batch process operation data to identify causes of poor batch performance
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Machine learning-driven analysis of batch process operation data to identify causes of poor batch performance
Machine learning-driven analysis of batch process operation data to identify causes of poor batch performance
For:
Batch manufacturers such as milk pasteurizers, pharmaceutical makers, paint
manufacturers, etc.Goal:
OtherProblem addressed
Provide insight to the operation team to improve the productivity of batch
manufacturing through machine learning on historical operation data.
Scope of use case
Detecting issues in a batch manufacturing process that lead to bad quality
products or longer cycle times for batch processing.
Description
Batch operation is generally quite complex, involving
dynamics in the operation and interplay of various process
variables. For this reason, sometimes a few batches end up
running slower than the nominal batch time and a few
batches also yield poor quality end products, resulting in
significant production loss. Additionally, often in the
industrial context, data size and variety are limited and to
develop a robust machine learning model from limited
available data sets is a challenging task.
Due to the transient nature of batch operation data, the
traditional PCA algorithm fails to analyse the batch data and
hence MPCA was applied as a logical extension of the PCA
algorithm. As MPCA naturally considers the dynamics in the
data and inter-correlations among the process variables, it
provides a valuable insight on the batch data.
The approach was successfully demonstrated on milk
pasteurization process data where only four batches were
provided for modelling. Using these four seed batches, the
algorithm synthetically created fifty batches of data and
introduced anomalies in some batches. The concept of design
of experiments and stochastic perturbations were used in
synthetic generation of the data set.
The work was able to successfully build a robust MPCA
model with such data and isolate bad batches of data from
good batches of data. Additionally, through contribution
plots, the algorithm identified when a certain batch drifted
from nominal operation and which variables were the root
cause of the bad batch operation.