Optimal control of multivariable periodic processes

✍ Scribed by M. Fjeld

• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 747 KB
• Volume: 5
• Category: Article
• ISSN: 0005-1098
• DOI: 10.1016/0005-1098(69)90111-3

✦ Synopsis

Inherent properties of some non-linear processes are utilized to improve the performance, forcing the processes with periodic controls.

Summary--The expression "periodic control" here means that the process is subjected to control variables which vary periodically with time. If then a periodic state exists, the process is periodic.

As far as it concerns theory, a possible improvement compared to optimal steady-state control, depends significantly upon the form of the performance criterion and the structure of the dynamic process equations.

Periodic control is applied to a continuous process, using the model of an ideal stirred tank reactor. Cycling of influent concentration and flow rate, temperature and flow rate or heat flux and flow rate, is utilized to maximize the mean output concentration of the wanted product.

As an alternative to the use of the Maximum Principle to calculate the optimal control, a simple extremum-seeking feedback control scheme is applied to optimize the process.