Evolutionary tuning of modular fuzzy controller for two-wheeled wheelchair

Ahmad, Salmiah and Siddique, Nazmul H. and Tokhi, Mohammad Osman (2012) Evolutionary tuning of modular fuzzy controller for two-wheeled wheelchair. International Journal of Computational Intelligence and Applications, 11 (2). 1250009 (1)-1250009 (23). ISSN 1757-5885 (O), 1469-0268 (P)

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Abstract

In this work, an optimization technique is adopted to manipulate the input and output scaling factors of a modular fuzzy logic controller (MFC) for lifting and stabilizing the front wheels of a wheelchair in two-wheeled mode. A virtual wheelchair (WC) model is developed within Visual Nastran (VN) software environment where the model is further linked with Matlab/Simulink for control purposes. The lifting of the chair is done by transforming the ¯rst link (Link1), attached to the front wheels (casters) to the upright position while maintaining stability of the second link (Link2) where the payload is attached. General rules of thumb allow heuristic tuning (trial and error) of the parameters but such heuristic method does not guarantee that the system tuned with current data set will represent future system states. A global optimization mechanism such as genetic algorithm is necessary to improve the system performance. Due to its signficant advantages over other searching methods, a genetic algorithm approach is used to optimize the scaling factors of the MFC and results show that the optimized parameters give better system performance for such a complex, highly nonlinear two-wheeled wheelchair system.

Item Type:	Article (Journal)
Additional Information:	4113/25364
Uncontrolled Keywords:	Evolutionary algorithms; two-wheeled wheelchair; fuzzy logic controller; modular fuzzy controller; genetic algorithms; parameter optimization
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ212 Control engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechatronics Engineering
Depositing User:	Ir. Dr. Salmiah Ahmad
Date Deposited:	09 Aug 2012 15:30
Last Modified:	09 Aug 2012 15:32
URI:	http://irep.iium.edu.my/id/eprint/25364

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