  This paper presents a quick learning mechanism for intelligent fault
diagnosis of rotating machines operating under changeable working conditions.
Since real case machines in industries run under different operating
conditions, the deep learning model trained for a laboratory case machine fails
to perform well for the fault diagnosis using recorded data from real case
machines. It poses the need of training a new diagnostic model for the fault
diagnosis of the real case machine under every new working condition.
Therefore, there is a need for a mechanism that can quickly transform the
existing diagnostic model for machines operating under different conditions. we
propose a quick learning method with Net2Net transformation followed by a
fine-tuning method to cancel/minimize the maximum mean discrepancy of the new
data to the previous one. This transformation enables us to create a new
network with any architecture almost ready to be used for the new dataset. The
effectiveness of the proposed fault diagnosis method has been demonstrated on
the CWRU dataset, IMS bearing dataset, and Paderborn university dataset. We
have shown that the diagnostic model trained for CWRU data at zero load can be
used to quickly train another diagnostic model for the CWRU data at different
loads and also for the IMS dataset. Using the dataset provided by Paderborn
university, it has been validated that the diagnostic model trained on
artificially damaged fault dataset can be used for quickly training another
model for real damage dataset.
