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- Derivative-Free Optimization with Proxy Models for Oil Production Platforms Sharing a Subsea Gas NetworkPublication . CARLOS, JÂNDER; Camponogara, Eduardo; Seman, Laio Oriel; Torreblanca González, José; LEITHARDT, VALDERIThe deployment of offshore platforms for the extraction of oil and gas from subsea reservoirs presents unique challenges, particularly when multiple platforms are connected by a subsea gas network. In the Santos basin, the aim is to maximize oil production while maintaining safe and sustainable levels of CO2 content and pressure in the gas stream. To address these challenges, a novel methodology has been proposed that uses boundary conditions to coordinate the use of shared resources among the platforms. This approach decouples the optimization of oil production in platforms from the coordination of shared resources, allowing for more efficient and effective operation of the offshore oilfield. In addition to this methodology, a fast and accurate proxy model has been developed for gas pipeline networks. This model allows for efficient optimization of the gas flow through the network, taking into account the physical and operational constraints of the system. In experiments, the use of the proposed proxy model in tandem with derivativefree optimization algorithms resulted in an average error of less than 5% in pressure calculations, and a processing time that was over up to 1000 times faster than the phenomenological simulator. These results demonstrate the effectiveness and efficiency of the proposed methodology in optimizing oil production in offshore platforms connected by a subsea gas network, while maintaining safe and sustainable levels of CO2 content and pressure in the gas stream.
- Static Attitude Determination Using Convolutional Neural NetworksPublication . Dos Santos, Guilherme Henrique; Seman, Laio Oriel; Bezerra, Eduardo; LEITHARDT, VALDERI; Sales Mendes, André; Stefenon, Stéfano Frizzo
- Hybrid Impedance-Admittance Control for Upper Limb Exoskeleton Using ElectromyographyPublication . Lira Da Silva, Lucas Daniel; Pereira, Thiago F.; LEITHARDT, VALDERI; Seman, Laio Oriel; Zeferino, Cesar Albenes
- An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSatsPublication . Martínez Vega, Sara; Morsch Filho, Edemar; Seman, Laio Oriel; Bezerra, Eduardo; Nicolau, Vicente De Paulo; GARCIA, RAUL; LEITHARDT, VALDERI
- Electric Field Evaluation Using the Finite Element Method and Proxy Models for the Design of Stator Slots in a Permanent Magnet Synchronous MotorPublication . Stefenon, Stéfano Frizzo; Seman, Laio Oriel; Schutel Furtado Neto, Clodoaldo; Nied, Ademir; Seganfredo, Darlan Mateus; da Luz, Felipe Garcia; Sabino, Pablo Henrique; Torreblanca González, José; LEITHARDT, VALDERI
- Optimal design of electrical power distribution grid spacers using finite element methodPublication . Stefenon, Stéfano Frizzo; Seman, Laio Oriel; Pavan, Bruno; López García, Raúl; LEITHARDT, VALDERISpacers in the compact power distribution network are essential components for the support, organization, and spacing of conductors. To improve the reliability of these components and have an optimized network design, it is necessary to evaluate the performance of the variation of their geometric parameters. The analysis of these components is fundamental, considering that there are several models available that are validated by the electric power utilities. Due to the various possible design shapes, it is necessary to use an optimized model to reduce the electric potential located in specific sites, improving the reliability in the component, as the higher electrical potential results in a greater chance of failure to occur. The finite element method (FEM) stands out for evaluating the distribution of electrical potential. In this paper, an FEM is used to evaluate variations in vertical and horizontal dimensions in spacers used in the 13.8 kV power grid. The models are analyzed in relation to their behavior regarding the potential distribution on their surface. From the results of these variations, the model is optimized by means of a mixed-integer linear problem (MILP), replacing the FEM output with a ReLU network substitute model, to obtain a spacer with more efficiency to be used in semi-insulated distribution networks.
- Decompositions for MPC of Linear Dynamic Systems with Activation ConstraintsPublication . Pedro Nunes Bento Da Silva, Avelino; Camponogara, Eduardo; Seman, Laio Oriel; Villarrubia Gonzalez, Gabriel; LEITHARDT, VALDERI
- A Study of Multilayer Perceptron Networks Applied to Classification of Ceramic Insulators Using UltrasoundPublication . Neto, Nemesio Fava Sopelsa; DE STEFANO, Alessandro; Meyer, Uta; Rafael, Torres Peña; Nied, Ademir; Seman, Laio Oriel; Villarrubia Gonzalez, Gabriel; LEITHARDT, VALDERI; Yow, Kin-Choong
- Irradiation Flux Modelling for Thermal Electrical Simulation of CubeSats: Orbit, Attitude and Radiation IntegrationPublication . Morsch Filho, Edemar; Seman, Laio Oriel; Rigo, Cezar; Nicolau, Vicente De Paulo; GARCIA, RAUL; LEITHARDT, VALDERI
- Long short-term memory stacking model to predict the number of cases and deaths caused by COVID-19Publication . Fernandes, Filipe; Stefenon, Stéfano Frizzo; Seman, Laio Oriel; Nied, Ademir; Ferreira, Fernanda Cristina Silva; Subtil, Maria Cristina Mazzetti; Rodrigues Klaar, Anne Carolina; LEITHARDT, VALDERI