Example of a multiobjective optimization problem with 2D decision and objective space.
Master-slave architecture for parallel evMOGA.
Starting conditions for the analysis. The inset shows an example of each of the different strategies used in the creation of vacancies in the starting PC.
(a) Pareto fronts for the different symmetries of generation of vacancies used for attenuation effect; (b) attenuation area for each analyzed symmetry.
Spectra of the resulting optimized samples: (a) Q1, (b) Q2, (c) Q3, and (d) Q4 shown in Fig. 4(a) (continuous line), and of the starting PC (dotted line). The range of frequencies optimized is delimited by two vertical dashed lines. The attenuation average level in the optimized range of frequencies for each of the symmetries used is represented (horizontal dotted line). Configurations of the optimized samples corresponding to each -vector are included as an inset.
(a) Asymmetry parameter and (b) fraction of vacancies for each analyzed symmetry. The points represent the value of the parameter for each of the optimized structures obtained, and the line represents their average value.
(a) Pareto fronts for the different vacancy generation symmetries used for focusing effect; (b) focusing area for each analyzed symmetry. The points represent the value of the parameter for each of the optimized structures obtained and the line represents their average value.
Acoustic level in the acoustic focus zone. On the axis, the distance along the direction of the incident wave is shown, and frequencies for the four strategies analyzed on the axis are also shown. The color bar represents the acoustic level in decibels. The corresponding samples are also included.
(a) Asymmetry parameter and (b) fraction of vacancies for the analyzed symmetries. The points represent the value of the parameter for each of the optimized structures obtained, and the line represents their average value.
Experimental measurement setup. The starting PC consists of hollow aluminum rods long and in diameter arranged in a triangular pattern with constant lattice . There are 397 cylinders.
Attenuation area versus number of cylinders for both analyzed cases.
Variation of the asymmetry of the nine obtained structures as a function of the vacancies created. Vertical lines represent the optimum number of vacancies for both analyzed cases.
Comparison of attenuation spectra corresponding to the starting PC, and the best sample obtained by means of the creation of vacancies: (a) ; (b) . The corresponding best structure obtained is shown in the inset.
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