Multi-regional fuzzy control for a pH neutralisation process.

NORTCLIFFE, Anne (2001). Multi-regional fuzzy control for a pH neutralisation process. In: EUSFLAT Conference 2001, Leicester, 5-7 September 2001. 295-300.

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pH control is the process of adding acid or base to opposing solutions aiming to achieve a solution of pH 7, defined as neutral solution. The function of the controller is to achieve a neutral output of the system. This in itself is not an easy problem to solve as pH control of a neutralisation process is a difficult non-linear control problem. This is largely due to the inherent non-linear behavior of pH measurement, and is further complicated by variable time delays in the process. The relationship between pH measurement and volume ratio of acid to base is non-linear and characteristically described as an S-type curve relationship. Therefore the pH control problem can be considered as posing three different regions of sensitivity for control. For this reason alone conventional methods of control provide unsatisfactory control results, as can only truly accommodate one region scenario. This paper presents both simulated and practical results of applying a unique fizzy logic method to control the pH process, utilising the novel concept of mutli-regional PD type fuzzy logic control. Each region of sensitivity is assigned a unique fuzzy logic model and set of rules. The results are placed in context with the results of conventional means and traditional PD type fuzzy logic control combined with a variable transformation technique. The results demonstrate the accuracy of the methods in achieving the objective, that is an output of pH 7

Item Type: Conference or Workshop Item (Paper)
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Engineering Research
Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Page Range: 295-300
Depositing User: Anne Nortcliffe
Date Deposited: 19 Jan 2018 14:56
Last Modified: 18 Mar 2021 16:17

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