Browsing by Keyword "Model adjustment"
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Item Investment Casting Moulds Optimisation by means of Advanced Simulation and instrumented Fibre-wrapped Moulds(European Investment Casters’ Federation (EICF), 2015-05-12) Meléndez, Antton; Anglada, Eva; Rodriguez, Pedro P.; Armenteros, AntonioThe simulation models have been adjusted to replicate the real process in future simulations by means of the advanced simulation combined with a planned experimentation carried out in industrial conditions, The simulation models include the presence of fibres (auxiliary materials) and their effects on the moulds and metal according to the number of layers (the use of these materials is crucial for the correct addressing of the solidification, because a proper solidification helps to obtain the technical requirements of the castings, face to achieve the best mould yield).Item Performance of Gradient-Based Solutions versus Genetic Algorithms in the Correlation of Thermal Mathematical Models of Spacecrafts(2017-05-24) Anglada, Eva; Martinez-Jimenez, Laura; Garmendia, Iñaki; CIRMETALThe correlation of the thermal mathematical models (TMMs) of spacecrafts with the results of the thermal test is a demanding task in terms of time and effort. Theoretically, it can be automatized by means of optimization techniques, although this is a challenging task. Previous studies have shown the ability of genetic algorithms to perform this task in several cases, although some limitations have been detected. In addition, gradient-based methods, although also presenting some limitations, have provided good solutions in other technical fields. For this reason, the performance of genetic algorithms and gradient-based methods in the correlation of TMMs is discussed in this paper to compare the pros and cons of them. The case of study used in the comparison is a real space instrument flown on board the International Space Station.