Cascade Control of a Residual Water Blunting System

Abstract

In this paper, a solution for the automatic control of a residual water blunting system is proposed. The blunting technological process, being a distributed parameter one, is modeled using partial differential equations. This approach implies very big technological advantages due to the fact that the user has access to the pH value in each point of the tanks of the blunting system. Another element of originality is the inclusion of a distributed parameter process in a control structure, having the possibility to maintain the pH value constant in each point in the volume of the liquid from the system. A method based on the matrix of partial derivatives of the state vector (Mpdx) associated with Taylor series is used for the modeling-simulation of both the blunting process and the control system. The results assured by a simple control structure are not sufficient due to the restrictive imposed performances, so a cascade structure is treated in the paper.

Keywords

• automatic control
• control system
• distributed parameter process
• numerical simulation
• partial differential equation