https://ri.ufs.br/jspui/handle/riufs/2495 2026-07-18T20:15:39Z https://ri.ufs.br/jspui/handle/riufs/25468 Título: Ambiente virtual para instalações elétricas prediais: uma proposta de desenvolvimento e validação no ensino e aprendizagem de engenharia elétrica Autor(es): Gomes, Rebeca Lorena Santos Maia Abstract: This study aimed to develop and validate a virtual environment designed as an educational game to support the teaching and learning of residential electrical installations, investigating its potential to foster meaningful learning and student engagement. The research was conducted at the Federal Institute of Bahia – Paulo Afonso Campus, following a quasi-experimental design with control and experimental groups defined by the natural distribution of classes. The experimental group participated in a short course associated with the use of the digital game, while the control group received the same instruction without the technological tool. Data collection included a profile questionnaire, a technical assessment applied in pre- and post-test stages, and the Learning Approaches Scale (EABAP), adapted to the study’s context. The confirmatory factor analysis indicated good model fit, with satisfactory adjustment indices (CFI = 0.96; TLI = 0.95; GFI = 0.92; RMSEA = 0.04; SRMR = 0.05), supporting the consistency of the proposed structure and the validity of the instrument. Results showed that the virtual environment enhanced students’ interaction with the content and promoted positive perceptions regarding the use of digital tools in the learning process. The experimental group demonstrated greater improvement in technical performance and a stronger tendency toward a deep learning approach, reflecting higher cognitive engagement and self-regulation. Overall, the use of educational games in teaching residential electrical installations proved to encourage more active, critical, and contextualized learning practices, consolidating the Critical Learning Nuclei (CLN) associated with key technical concepts. The main contribution of this study lies in the empirical validation of a digital resource capable of integrating theory and practice, providing evidence of its pedagogical effectiveness and offering methodological insights for improving teaching practices in electrical engineering education. 2026-05-07T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25467 Título: Avaliação dos impactos de múltiplos agentes na gestão da poluição salina em subestações de alta tensão Autor(es): Lisboa, João Lucas de Castro Abstract: The increasing dependence of modern society on electric power makes it essential to maintain the operation of electric power services with quality and reliability. In this context, this work aims to analyze multiple variables to identify signals that indicate the degradation of the performance of electrical insulation in high-voltage substations, with a focus on the influence of meteorological variables, such as temperature and precipitation, on leakage current signals. The research was conducted with data collected in a real application environment, on the insulation of the (500 kV) substation of the Usina Termelétrica Porto de Sergipe I, owned by Eneva S.A. The substation is located 1.5 km from the sea, in the municipality of Barra dos Coqueiros, Sergipe, Brazil. In this research, an analysis was carried out to verify how attributes of the leakage current, associated with meteorological conditions, can indicate the insulation conditions and how the phenomenon can be understood from a multivariate approach. For this purpose, dry periods over a year were analyzed, using trend analysis tools in time series, covariance matrix, principal component analysis, and data clustering. The results evidenced the existence of distinct patterns, making it possible to identify the contribution of each variable analyzed and classify the data into main clusters. The adopted methodology proved to be effective in characterizing the phenomenon and contributes to predictive monitoring strategies in high-voltage environments. 2025-08-28T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25418 Título: Otimização de ajustes de relés direcionais de sobrecorrente em linhas de subtransmissão em anel Autor(es): Campos, Marcos Vinícius Santana Abstract: The use of a tuning optimization study is extremely important in the process of parameterizing overcurrent relays, and is therefore a tool to support the decisionmaking of the protection engineer responsible for preparing the protection coordination study, making the study accurate and fast. In this dissertation, the aim was to optimize the coordination of directional overcurrent relays installed on transmission lines in meshed systems. To this end, a computational tool was developed on the Scilab platform using the PSO - Particle Swarm Optimization algorithm. The main functionalities of the application are: (i) automatic calculation of short-circuit conditions (on buses and close-in on lines), (ii) determination of the restrictions to be met, (iii) automatic determination of the Objective Function to be minimized, (iv) optimization of the curves of the IEC and IEEE families. The proposed optimization technique yielded promising results, with satisfactory fault clearance times that met all restrictions imposed by the analyzed system, in addition to ensuring the elimination of the defect in all stages of protective relay operation, without compromising the desired selectivity. 2025-08-21T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25398 Título: Medição de força de mordida baseada em extensometria no elemento dentário Autor(es): Santos Júnior, Nilson Rodrigues Abstract: Bite force constitutes a relevant parameter for the diagnosis and treatment of oral pathologies. Several studies have search for to develop methods to assess bite force, considering its ability to detect issues related to masticatory efficiency, TMD, and bruxism. However, many devices for this type of measurement significantly interfere with oral anatomy, potentially causing discomfort to the patient and unreliable measurements. Thus, aiming to enable bite force measurement without interference in the natural oral anatomy, this dissertation presents the development, analysis, and investigation of a force measurement system based on strain gauges applied to a dental element, constructed using a 3D-printed photopolymer resin model. To conduct this study, two cylindrical load cells (one solid and one hollow), three 3D-printed models of teeth, and electrical resistance strain gauges were used; the gauges were bonded to the load cells and models using Loctite 496 adhesive. The results evidenced that the models exhibited linear behavior, and, in particular, the models with a 3 mm cavity preparation showed higher sensitivity compared to the solid (intact) models. It was also observed that better occlusal stability results in a lower standard deviation in measurements. Due to its high gain, the measurement system is significantly influenced by temperature, although this effect can be compensated. In this context, this dissertation proposes a new approach for bite force measurement with potential for diverse biomedical applications. 2026-02-04T00:00:00Z