Oscillations are a common type of plant-wide disturbances in chemical process

which may impact overall process performance.Normally

the fault diagnosis methods only based on the amplitude domain of data have a poor performance on these problems.The method introduced

time delay analysis

based on the time domain knowledge of data

could establish the fault propagation path and identify the root cause of the oscillation.The innovation of this paper was to combine the Hopfield network and time delay analysis method and create a complete fault isolation strategy.The approach was applied to the Tennessee Eastman (TE) model and the result proved its good quality for industry application.