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Title: Controller performance assessment of servomechanisms for nonlinear process control systems
Authors: Pillay, N.
Govender, P. 
Maharaj, O.
Keywords: Performance assessment;PID control;Nonlinear process;Setpoint tracking
Issue Date: Oct-2014
Publisher: WCECS
Source: Pillay, N.; Govender, P. and Maharaj, O. 2014. Controller performance assessment of servomechanisms for nonlinear process control systems. Proceedings of the World Congress on Engineering and Computer Science. 2.
Journal: Lecture notes in engineering and computer science (Online) 
Abstract—This paper aims at assessing the setpoint tracking performance of proportional-integral-derivative (PID) controllers for nonlinear single-input-single-output (SISO) process loops. A comparison is made between the actual system output and an artificial process output response derived from nonlinear system identification and a user defined closed loop transient specification. Nonlinear system identification is achieved by fitting routine operating closed loop data to nonlinear autoregressive with exogenous input (NARX) models to describe a closed loop process model and the servo model.
Once the nonlinear models are established they are linearized to corresponding autoregressive with exogenous input (ARX) models where they are incorporated into a controller performance strategy. The framework will allow for control practitioners to assess the current controller setpoint tracking performance for general nonlinear systems from a transient specification point of view. Simulation studies are given to validate the efficacy of the performance assessment procedure and demonstrate that it is an effective tool when setpoint tracking is of general interest.
ISSN: 2078-0966
Appears in Collections:Research Publications (Engineering and Built Environment)

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