Encontrados 47 documentos, a visualizar página 1 de 5
An integrated approach to automated innovization for discovering useful design ...
Deb, Kalyanmoy; Bandaru, Sunith; Greiner, David; Gaspar-Cunha, A.; Tutum, Cem CelalAvailable online 31 October 2013 ; Computational optimization methods are most often used to find a single or multiple optimal or near-optimal solutions to the underlying optimization problem describing the problem at hand. In this paper, we elevate the use of optimization to a higher level in arriving at useful problem knowledge associated with the optimal or near-optimal solutions to a problem. In the propos...
An evolutionary algorithm based pattern search approach for constrained optimiz...
Datta, Rituparna; Costa, M. Fernanda P.; Gaspar-Cunha, A.; Deb, KalyanmoyConstrained optimization is one of the popular research areas since constraints are usually present in most real world optimization problems. The purpose of this work is to develop a gradient free constrained global optimization methodology to solve this type of problems. In the methodology proposed, the single objective constrained optimization problem is solved using a Multi-Objective Evolutionary Algorithm (...
Using multi-objective evolutionary algorithms for optimization of the cooling s...
Fernandes, Célio; Pontes, A. J.; Viana, J. C.; Gaspar-Cunha, A.The cooling process in polymer injection moulding is of great importance as it has a direct impact on both productivity and product quality. In this paper a Multi-objective Optimization Genetic Algorithm, denoted as Reduced Pareto Set Genetic Algorithm with Elitism (RPSGAe), was applied to optimize both the position and the layout of the cooling channels in the injection moulding process. The optimization model...
Multi-objective ant colony optimization for the twin-screw configuration problem
Teixeira, Cristina; Covas, J. A.; Stützle, Thomas; Gaspar-Cunha, A.The Twin-Screw Configuration Problem (TSCP) consists in identifying the best location of a set of available screw elements along a screw shaft. Due to its combinatorial nature, it can be seen as a sequencing problem. In addition, different conflicting objectives may have to be considered when defining a screw configuration and, thus, it is usually tackled as a multi-objective optimization problem. In this resea...
Rheological and thermal characteristics of wheat gluten biopolymers plasticized...
Ferreira, Shana Pires; Ruiz, Walter; Gaspar-Cunha, A.The objective this work was to obtain bioplastics from mixtures of wheat gluten and glycerol by two different processes and evaluate their respective rheological properties. The mixtures and their respective bioplastics were obtained through direct batch mixing under approximately adiabatic and isothermal conditions. The bioplastics showed high values for the storage (G’) and loss (G’’) moduli, suggesting a str...
Incorporating tool deformation in the design of extrusion dies for complex holl...
Moosavi, M. R.; Gaspar-Cunha, A.; Carneiro, O. S.; Nóbrega, J. M.The potential of OpenFOAM to design extrusion dies, incorporating the Fluid Structure Interaction (FSI)
Study of solids conveying in single screw extruders based on flow dynamics and ...
Michelangelli, O. P.; Gaspar-Cunha, A.; Covas, J. A.Flow of granular matter is presently a subject of extensive research, due to the characteristics of this type of systems (e.g., dilatancy, segregation, arching, clustering) and relevance to various application areas, such as civil construction, agriculture, food processing, geophysics, pharmacology [1, 2]. The plasticating process in single screw polymer extrusion is one of the areas where this research can hel...
A scaling-up methodology for co-rotating twin-screw extruders
Gaspar-Cunha, A.; Covas, J. A.Scaling-up of co-rotating twin screw extruders is studied as a multi-objective optimization problem where the aim is to define the geometry/operating conditions of the target extruder that minimize the differences between the values of the performance criteria that depict the reference and target extruders. Three computational experiments are discussed. These preliminary results seem encouraging.
Aesthetic design using multi-objective evolutionary algorithms
Gaspar-Cunha, A.; Loyens, Dirk; Hattum, F. W. J. vanThe use of computational methodologies for the optimization of aesthetic parameters is not frequent mainly due to the fact that these parameters are not quantifiable and are subjective. In this work an interactive methodology based on the use of multi-objective optimization algorithms is proposed. This strategy associates the results of different optimization runs considering the existent quantifiable objective...
Flow dynamics and structure of solid pellets along the channel of a single scre...
Michelangelli, O. P.; Yamanoi, M.; Gaspar-Cunha, A.; Covas, J. A.Plasticating single screw extrusion involves the progressive compaction and heating of loose solid pellets that eventually melt, form a relatively homogenous stream and are subsequently pumped through a shaping tool. Traditional analyses of the solids conveying stage assume the sliding of an elastic solid plug due to differential wall friction coefficients. However, not only the corresponding predictions may fa...
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