Return to search

Design and FPGA implementation of a log-domain high-speed fuzzy control system

The speed of fuzzy controllers implemented on dedicated hardware is adequate for control of any physical process, but too slow for todays high-complexity data networks. Defuzzification has been the bottleneck for fast implementations due to the large number of computationally expensive multiplication and division operations. In this thesis, we propose a high-speed fuzzy inferential system based on log-domain arithmetic, which only requires addition and subtraction operations. The system is implemented on a Xilinx Virtex-II FPGA with a processing speed of 67.6 MFLIPS having a maximum combinational path delay of 4.2 ns. It is a clear speedup compared to the reported fastest 50 MFLIPS implementation. A pipelined version of the controller is also implemented, which achieves a speed of 248.7 MFLIPS. Although a small approximation error is introduced, software simulation and hardware implementation on FPGA confirm high similarity of the outputs for control surfaces and a number of second-order plants. / Software Engineering and Intelligent Systems

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/979
Date06 1900
CreatorsRazib, Md Ali
ContributorsDick, Scott (Electrical and Computer Engineering), Gaudet, Vincent (Electrical and Computer Engineering), Reformat, Marek (Electrical and Computer Engineering), Amaral, Nelson (Computing Science)
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeThesis
Format832122 bytes, application/pdf
RelationAli Razib, Scott Dick and Vincent Gaudet (2009). Design of a high-speed fuzzy logic controller based on log-domain arithmetic. 39th International Symposium on Multiple-Valued Logic, 139-144.

Page generated in 0.0015 seconds