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Adaptive Type1 Fuzzy Controller for Lag Dominant First and Second Order Nonlinear Systems
1 , 2 , * 1 , 3 , 1
1  School of Electronics Engineering, VIT-AP University, Amaravati-522237, Andhra Pradesh, INDIA
2  School of Electrical Engineering, Vellore Institute of Technology (VIT), Chennai-600127, Tamil Nadu, INDIA
3  School of Computer Science and Engineering, VIT-AP University, Amaravati-522237, Andhra Pradesh, INDIA
Academic Editor: Nunzio Cennamo


Most of the current day industries are suffering from nonlinear processes. Thus, both the stability and the process performance of high-degree nonlinear systems with dominating delay might be difficult to achieve. Adaptive and intelligent fuzzy classifiers and controllers have been more popular in recent years as a means of overcoming a significant number of difficulties faced by the industrial sector. A large number of dynamic process plants with a variety of orders and kinds have been represented heuristically and recognized. Fuzzy structures have also been employed for these interactive systems by making use of fuzzy and linguistic techniques. In view of all these initiatives, the purpose of this paper is to conduct an experimental investigation into the performance of a LabVIEW-based Type-1 Adaptive Mamdani Fuzzy Controller (AMFC) that has been designed and applied over a lag dominant and a second-order nonlinear Dual Input Tank System (DITS) and Single Input Tank System (SITS). As compared to other Type-I approaches that were previously experimented with and are now in existence, the adaptability of AMFC demonstrates that it is quite effective. Performance indices such as Integrated / Summated Absolute Error (IAE) and Integrated / Summated Squared Error (ISE) are also computed for several variable set point profiles of DITS. These indices measure errors in integrated absolute value and integrated squared value, respectively. Adaptive Type-1 Intelligent Fuzzy Controller's response and error reduction efficiency have been found for several flow configurations of DITS, namely Multiple Input Multiple Output (MIMO) and Single Input Single Output (SISO). From the results, it can be concluded that the proposed experimental validation may be used for a wide variety of process challenges that are experienced in industrial systems to achieve robust and low error controller performances.

Keywords: Error Performance Index; Lag Dominant Systems; Nonlinear Systems; Spherical Tanks; Type1 Fuzzy Controller