Diagnosis of Process Nonlinearities and Valve Stiction
Choudhury, Ali Ahammad Shoukat / Thornhill, Nina F. / Shah, Sirish L.
In this book, Higher Order Statistical (HOS) theory is used to develop indices for detecting and quantifying signal non-Gaussianity and nonlinearity. These indices, together with specific patterns in the mapping of process output and controller output are used to diagnose the causes of poor control loop performance.
Often valve stiction is the main cause of poor control performance. A generalized definition of valve stiction based on the inves...
