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8. Multi‐phase method of estimation and adaptation of parameters of electrical battery models.

Author

Binelo, Marcia F. B., Sausen, Airam T. Z. R., Sausen, Paulo S., Binelo, Manuel O., and Campos, Maurício

Subjects
*ELECTRIC batteries, *PARAMETER estimation, *ARTIFICIAL neural networks, *LEAD-acid batteries, *LITHIUM-ion batteries, *ARTIFICIAL intelligence
Abstract

Summary: Mathematical modeling of the battery lifetime is an important tool for the design of more efficient batteries, as well as for the optimization of their use. The electrical models class is among the classes of mathematical models used for this purpose, and a fundamental step to their application is the correct estimation of their parameters. This paper performs the mathematical modeling of Lithium‐Ion Polymer batteries lifetime through the electrical model of Tremblay, in which a multi‐phase method of estimation and adaptation of parameters is proposed, divided into three phases: discovery, learning, and inference. The multi‐phase method is based on two Artificial Intelligence techniques: genetic algorithms and artificial neural networks. The proposed method is validated by the simulation and experimental studies. From the results, it is concluded that the application of the multi‐phase method improves the effective accuracy of the Tremblay model, when it comes to adapt its parameters to the battery during runtime. For constant discharge currents, the average error reduction was 79%, when compared to the best set of parameters obtained by GA without the adaptation process. For variable current discharge curves, the method was able to reduce the error more than 35%. This method can be applied to other battery lifetime prediction models. [ABSTRACT FROM AUTHOR]

Published
2021
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11. A eficiência na produção de biomassa e grãos de aveia pelo uso do nitrogênio

Author

Mantai, Rubia D., Silva, José A. G. da, Sausen, Airam T. Z. R., Costa, Juliane S. P., Fernandes, Sandra B. V., and Ubessi, Cassiane

Subjects
technical efficiency and economic, ureia, Avena sativa L, eficiência técnica e econômica, urea, C/N ratio, razão C/N
Abstract

A produção de biomassa e grãos de aveia depende diretamente das formas de fornecimento de nitrogênio (N). Propôs-se, com este estudo, determinar a eficiência de aproveitamento de N-fertilizante na elaboração de biomassa e grãos de aveia em distintos sistemas de cultivo e estimar a máxima eficiência técnica e econômica de produtividade de grãos na identificação de cultivares mais eficientes no uso do N. O estudo foi conduzido nos anos de 2011 e 2012, em delineamento experimental de blocos casualizados com quatro repetições em esquema fatorial 4 x 2 para Doses de Nitrogênio (0, 30, 60 e 120 kg ha-1) e Cultivares de Aveia (Barbarasul e Brisasul) no sistema soja/aveia e milho/aveia. Há tendência de crescimento na taxa de biomassa em aveia com o incremento das doses de N-fertilizante em ambos os sistemas de cultivo, condição nem sempre acompanhada da maior produtividade de grãos. A cultivar Brisasul mostra maior eficiência no aproveitamento do N à elaboração de biomassa e grãos, independente do sistema de cultivo. A definição da dose ajustada em aveia permite resultados mais vantajosos pela análise da máxima eficiência econômica de produtividade de grãos. The production of biomass and oat grains is directly dependent on the forms of nitrogen (N) supply. The objective of this study was to determine the efficiency of utilization of N-fertilizer on biomass and grain oat in high and reduced N-residual release in different cropping systems and estimate the maximum technical and economic efficiency of grain yield in identifying cultivars more efficient in the use of N. The study was conducted in the years 2011 and 2012 in a randomized block design with four replications in a 4 x 2 factorial with four nitrogen rates (0 , 30 , 60 and 120 kg ha-1) and two oat cultivars (Barbarasul and Brisasul) in soybean/oat and corn/oat system. There is a tendency of increase in growth rate in oat biomass with increasing doses of N-fertilizer in both cropping systems, however, condition is not always accompanied by the increased productivity of grain. The cultivar Brisasul shows greater efficiency in the utilization of N in the elaboration of biomass and grain, independent of the production system. The definition of adjusted dose in oats allows more advantageous results by analysis of maximum economic efficiency for grain yield.

Published
2015

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