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    Metaheuristic-Based PID Controller Design with MOOD Decision Support Applied to Benchmark Industrial Systems
    (MDPI AG, 2025-09-13)
    PAVÓN VALLEJOS, WILSON DAVID  
    This paper presents a comprehensive methodology for the multiobjective tuning of MIMO proportional integral derivative (PID) controllers using advanced metaheuristic strategies. The proposed approach formulates a cost function based on two conflicting performance criteria—the integral of absolute error (IAE) and the integral of absolute derivative of control (IADU)—to explore the trade-off between tracking performance and control effort systematically. Three metaheuristic techniques are employed: stochastic hill climbing, a Voronoi-based heuristic, and the Nondominated Sorting Genetic Algorithm (NSGA-II). A novel Multiobjective Optimization Design (MOOD)-based classification framework is incorporated to facilitate decision making across the Pareto front. The methodology is validated on three benchmark MIMO plants, demonstrating its robustness and generalizability. The results highlight that the NSGA-II controller achieves the lowest IADU value of 0.3694 in the mass damper system while maintaining acceptable performance metrics. The inclusion of a PID-split strategy further enhances system flexibility. This study emphasizes the value of metaheuristics in navigating complex design spaces and delivering tailored control solutions for multiobjective scenarios.
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    Effect of Partially Protected Sodium Butyrate on Performance, Digestive Organs, Intestinal Villi and E. coli Development in Broilers Chickens
    (Science Alert, 2014-06-15)
    F. Chamba
    ;
    M. Puyalto
    ;
    A. Ortiz
    ;
    H. Torrealba
    ;
    J.J. Mallo
    The aim of this study was to evaluate the effect of partially protected sodium butyrate (PSB) onperformance, digestive organs, intestinal villi and E. coli development in broilers chickens. Nine hundredtwenty four one-day-old mixed Cobb chicks were divided in 3 treatments with 7 replicates each in a®randomized block design. Treatment T1 was a control diet without any growth promoter, treatment T2 wasthe control diet plus colistin at 100,000 IU/kgBW and treatment T3 was the control diet with PSB at 700 ppm.Chicks were fed in mash form for 3 phases: starter (1-14 days), grower (15-28 days) and finisher (29-42days). There were no significant differences on performance among all treatments in starter phase. Chicksfed PSB in grower and finisher phases had the highest weight gain and the best feed conversion ratio.Relative digestive organs weights were not affected by treatment in any phase. Jejunum and small intestinerelative lengths of birds fed PSB and colistin at 14 days were longer than those of birds fed control diet.Jejunal villi of birds fed PSB and colistin at 42 days were higher than those in birds fed the control diet.Colistin produced the deepest crypts and the lowest villi height/crypt depth ratios in all intestinal segmentsat 14 days. Intestinal E. coli growth was not affected by any treatment. These data indicate that partiallyprotected sodium butyrate and colistin improves performance, colistin as an antibiotic growth promoter andPSB by improving intestinal villi development in broilers chickens.