Residual generation and visualization for understanding novel process conditions

We study the generation and visualization of residuals for detecting and identifying unseen faults using auto-associative models learned from process data. Least squares and kernel regression models are compared on the basis of their ability to describe the support of the data. Theoretical results show that kernel regression models are more appropriate in this sense. Moreover, experiments on vibration and current data from an asynchronous motor confirm the theory and yield more meaningful results.