This paper proposes a practical method to identify the process dynamics for an integral process with dead-time, under continuous self-excited oscillation. It is assumed that the limit cycle is mainly caused by either the nonlinear property, dead-time …
Mixing is a major process in process industries, and uniformity mixture and concentration control are essential in the mixing process. This paper discusses solid ratio control of slurry in a mixing tank. In the …
This paper proposes a practical sampled-data I?P controller design for integrating processes. The controller struc-ture, derived from model predictive control theory, is a simple I?P controller. Application to predictive functional …
A novel model identification methodology for ARX models based on transfer functions has been proposed. The identification approach converts transfer functions to ARX models with no approximation, except zero-order hold. Model parameters of the …
The tuning of PID controllers is of great importance for process industries because it directly affects productivity, operability, and operating cost. Performance monitoring and maintenance of PID controllers are also serious issues for anyone …
Oscillations in process control loops present a common problem. This paper proposes a new algorithm to detect valve stiction for diagnosis of oscillation. Formalism for the qualitative description of input?output characteristics of a valve is also …
This paper proposes a new control approach for highly nonlinear chemical processes with operational mode changes. We combine a successive linearization and an MLD (mixed logical dynamical) formulation to transform an MPC (model predictive control) …