In this paper we compare and discuss the performance of a boiler evaporator system when the system is controlled by a traditional PID-type strategy and when the system is enhanced by using fuzzy logic blocks to provide set-points for the system. The strategy used in fuzzy logic controllers (FLCs) is called fuzzy supervisory control and it generates set-points for the conventional controllers. T...

A fuzzy-nets based in-process adaptive surface roughness control (FNASRC) system was developed in this research. The FNASRC system was able to adapt cutting parameters in-process and in a real time fashion to improve the surface roughness of machined parts when the surface roughness quality was not meeting customer requirements in the end milling operations. The FNASRC system was comprised of t...

In this paper, fuzzy logic integrated with the Taguchi method is used to optimize Wire Electro Discharge Machining (WEDM) process with multiple quality characteristics. Rough machining with EDM gives poor surface finish and has micro cracks and pores. Finish machining gives better surface finish but with very poor machining speed (MRR). Spark gap width is one of the important performance measur...

In this paper we present a comparison of two fuzzy-control approaches that were developed for use on a non-linear single-input singleoutput (SISO) system. The first method is Fuzzy Model Reference Learning Control (FMRLC) with a modified adaptation mechanism that tunes the fuzzy inverse model. The basic idea of this method is based on shifting the output membership functions in the fuzzy contro...

Tool wear condition monitoring has the potential to play a critical role in ensuring the dimensional accuracy of the workpiece and prevention of damage to cutting equipment. It could also help in automating cutting processes. In this paper, the feed cutting force estimated with the aid of an inexpensive current sensor installed on the ac servomotor of a computerized numerical control turning ce...

In this paper some problems of the mathematical modelling and high control algorithms of feed-batch fermentation process of Escherichia coli are considered. An unstructured mathematical model for E. coli feed-batch fermentation is developed on the base of FIA measurements. Methodology for the models’ parameters estimation is proposed on the basis of nonlinear optimization methods. The model acc...

This paper presents a way of fuzzy inferencing that allows for the resulting judgment to change in time. The aim of the research is to explain the empirical evidence that people’s feelings about a person or a social situation sometimes oscillate between a highly positive value and a highly negative value even in the absence of new data. The proposed method of judgment generation employs the con...