Fuzzy logic for non-conventional control of an intelligent beam. / Lógica difusa para controle não convencional de uma viga inteligente.
AUTOR(ES)
Renato Kazuki Nagamine
DATA DE PUBLICAÇÃO
2001
RESUMO
The advances in aeronautical industry have been ensured by the application of novel technologies. For aeroelastic control the intelligent structure concept has become increasingly important. An intelligent structure is a structural control system in which structural elements, sensors, actuators, control laws, associated electronics, and signal processing are highly integrated providing better performance. The developments in this area have been encouraging and multi-disciplinar. In this context, this work aims studying control laws for intelligent structures represented through the fuzzy logic. This non-conventional method for control has provided advances in treating complex, non-linear, imprecise, and ambiguous systems.A finite element model of an intelligent beam with piezoelectric actuators is developed. The model is based in the assumptions of an Euler-Bernoulli beam and the electromechanic variational principle. The finite element model is validated to ensure its use in non-conventional control design. Non-conventional control strategies based on the two fuzzy control methodologies, that are, the Mamdani and Takagi-Sugeno-Kang models, are investigated. The fuzzy control is applied to reduce the vibratory response of the intelligent beam due to external mechanical disturbances. A comparison between the two fuzzy control methodologies is shown and discussed. The satisfactory results achieved by this work have shown that the application of fuzzy control for the alleviation of vibrations in beams with piezoelectric actuators is appropriate. It is also observed that the Takagi-Sugeno-Kang fuzzy model has presented a better performance when compared with the Mamdani one.
ASSUNTO(S)
elementos finitos estruturas inteligentes finite elements fuzzy control intelligent structures controle difuso
