The development of an automated recirculation aquaculture system (ARAS) is presented here. The production system facility was built in a 672-m 2 polyethylene greenhouse using four 20-m 3 tanks, each of which was stocked with 1,000 tilapia (O. niloticus). The growth of the fish was evaluated from a starting weight of 2 g to a final average weight of 418 g, during a production cycle from July 2008 to January 2009. Our objective was to develop new technological approaches, based on fuzzy logic control, to integrate into novel automated equipment for recirculation aquaculture systems used for fish production under intensive conditions. This technique allows farmers to incorporate their knowledge and experience into the control system. The results demonstrated a substantial water savings of 97.42%. There was a total fish biomass production of 1,655.3 kg and an average feed conversion rate of 1.55. The environmental variables were kept within acceptable ranges for tilapia production. We conclude that it is possible to increase the productivity and profitability of aquaculture systems, by applying new approaches based on modern control techniques, such as fuzzy logic control, that promote resource optimization.
ResumenEn este trabajo se propone un algoritmo genético con "cruzamiento natural" y se aplica sobre una representación continua-discreta con el fin de optimizar armaduras. El objetivo es disminuir el peso restringiendo los desplazamientos de los nodos y limitando los tipos de perfiles estructurales a usar. Las soluciones se combinan con dos tipos de cruzamientos en la misma representación, que permiten explorar de una manera efectiva el espacio de búsqueda. Los resultados se validan comparando los encontrados en este trabajo contra los de la literatura, para el caso del diseño de la armadura de un puente de 70 m de claro. Se obtienen soluciones más ligeras y con diferente topología. Adicionalmente se propone un caso de estudio, el diseño de la techumbre de un invernadero, que después se construye a escala real y se somete a cargas para verificar su resistencia.
Descriptores• asimetría • armadura de gran claro • invernadero
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