Navegando por Afiliação "UEA - Universidade do Estado do Amazonas"

Agora exibindo 1 - 6 de 6

Acesso aberto (Open Access)
Desenvolvimento a eventos discretos de um controlador de balanceamento de fases para sistemas legados de baixa tensão e microgrids
(Universidade Federal do Pará, 2019-06-10) VILCHEZ, José Ruben Sicchar; SILVA, José Reinaldo; http://lattes.cnpq.br/9317869378701106; COSTA JÚNIOR, Carlos Tavares da; http://lattes.cnpq.br/6328549183075122
In the up-grading of the legacy low-voltage system as urban microgrids, phase - balance algorithm development becomes useful and important to ensures robust and reliable load balancing, establish an efficient automation workflow among consumers, the legacy lowvoltage grid and the supervision center of the distribution network of electrical power. It constituting an alternative. This may constitute an alternative phase-balancing control system based on consumer units dynamic switching rather than electrical current injection by microgrids. Formal automation design of these algorithms become an interesting milestone for performance evaluation and properties validation for their insertion in the new microgrid architecture. This may evaluate the system's reliable performance when verifying dynamic properties as well as, the univocal solutions that ensure load transfer and load stability robustness of low-voltage grid, without operation interruptions neither conflicting events. This work, proposes a new phase-load- balancing control system based on combined algorithms resulting from a Hierarchical Petri net system design. Through this model it was obtained an optimized and reliable automated workflow of load balance in the low-voltage grid phases, with an efficient choice of consumer units for the switching process, aiming to obtain a robust steady state of load against unbalances between phases, and neutral current minimized. From the model obtained called “Transformer- Phase Balancing Controller” (T-PBC) were developed four integrated algorithms: the Load Transfer Algorithm, that calculates the load imbalance level and power to be transferred in the transformer phases; the Consumption Diagnose Algorithm, that identifies the load levels margins in each consumer unit; the Consumption Forecast Algorithm, that forecast the monthly energy future states in consumers; and the Switch Selection Algorithm, that selects the consumers units to switch based on the future state of energy consumption, the load level margins and the average of the energy future states. Based on the performance results, it was obtained, the efficient reduction of the neutral current and the load average unbalance in the low-voltage grid phases, with load stability robustness about three months, making it an efficient alternative system against load unbalances in the legacy low-voltage grid and the microgrids.
Acesso aberto (Open Access)
Desenvolvimento de um protótipo de robô móvel inteligente para transporte de material em ambiente indoor
(Universidade Federal do Pará, 2021-10-29) GOMES, Marivan Silva; LEITE, Jandecy Cabral; http://lattes.cnpq.br/7279183940171317
This dissertation is focused on methods, techniques and tools to assist the development of products and robots that need to work with precision in indoor environments, besides presenting the main technologies related to the subject, with their respective advantages, disadvantages, challenges. Finally, a prototype of a mobile robot will be proposed and developed. Self-driving vehicles have become part of Industry 4.0. The Fourth Revolution is present in all stages of manufacturing a product, with benefits for safety, profitability, quality, assembly and worker well-being. Intelligent mobile robots have the ability to move in predetermined places, autonomously and without running the risk of colliding with other robots or people, being able to reprogram their trajectories, no longer having the need to place markers when along its route. They are able to carry heavy loads, carry out unhealthy tasks and work 24 hours a day, 7 days a week.
Acesso aberto (Open Access)
Entre cacos e flores: apropriações, usos e significados dos vestígios arqueológicos pelos moradores do sítio Macurany, Parintins, Amazonas
(Universidade Federal do Pará, 2022-08-31) BIANCHEZZI, Clarice; ALMEIDA, Marcia Bezerra de; http://lattes.cnpq.br/1085631337892211
This research intended to comprehend the appropriations, uses and meaning given to the archaeological vestiges by people who lives nearby the archaeological sites located in Macurany community, Parintins, Amazon state. I present the narratives from Macurany´s people about the archaeological remains, their plurality of interactions with the Indigenous Dark Earth, the nut trees, landscape, along with the intangible – visages, haunted things, enchanted beings and other existences who can possess the body and spirit of local people and that in Macurany is also linked to the archaeological materiality. I highlight the challenges of archaeological heritage management in the Amazon, considering the archaeological domestic collections realities in Macurany and Parintins. The reflection that was brought aims at contributing to the archaeological patrimony management in the region and to better comprehend the relationships between the amazonian people and the traces from the ancestral occupations. The entanglement of agriculture cultivars, flowers and archaeological sherds, it was possible to recognize the affection and the sense of belonging of the people to their place and their traces; the things of the past and present in Macurany community.
Acesso aberto (Open Access)
Estudo da viabilidade de implantação de técnica de reaproveitamento dos resíduos do frigorífico Frigopeixe em Tefé-AM
(Universidade Federal do Pará, 2019-05-06) CAXEIXA, Luiz Augusto Reis; CUNHA, Edinaldo José de Sousa; http://lattes.cnpq.br/8714515962963079
The large amount of organic solid waste from the fishing industry is a serious socio-environmental problem. The treatment of organic solid wastes, such as the residues of the fish slaughterhouses, has a great reutilization potential, being able to generate by-products that attend both environmental and economic aspects. The aim was to study and propose ways to treat the fish processing residues from Frigopeixe Frigorífico, aiming to provide a sustainable destination for that material in order to achieve the goal of decrease to zero the disposal of those residues in the sanitary landfill of the city of Tefé, without burden the company. In particular, three techniques of reuse of fish waste were studied: composting, silage and fish meal. The study took into account the company production per harvest of 969 tons, on average, and waste generated quantity of 171 tons, on average, the extent of the technique in the reuse of the waste, the cost of implantation, period of storage, maintenance and return on investment, as well as the socio-environmental gain with that implementation. Each of the techniques studied presented great potentials of reuse of the residues, but the production of fish meal proved to be very expensive in its installation and maintenance, becoming, initially, not feasible. The other two techniques have a more adequate profile with the production and investment dimensions of the company, being able to be made a joint deployment, being a technique complementary to the other in the reuse of waste, composting and silage.
Acesso aberto (Open Access)
Segurança no trabalho: especificação de um modelo de inferência fuzzy para avaliação do agente calor
(Universidade Federal do Pará, 2021-08-02) VIEIRA, Alex Sander Záu; NASCIMENTO, Manoel Henrique Reis; http://lattes.cnpq.br/0850846128967798
This article presents a study that consists of a fuzzy inference model specification for the evaluation of heat agents. The structure of model fuzzy used were inputs measured temperature and metabolic rate, while the output was work environment condition that could be salubrious or insalubrious. Through, the inference rules established and according to Brazil legislation about heat, Occupational Hygiene Standard 06, the proposed model can determine the worker conditions about the heat. The validation process is done in three industries from the Industrial Pole of Manaus, therefor all the process necessary for preparations to use the proposed model was described to obtain all the variables necessary in the field. As a result, the proposed model got the correct classification of work environment conditions with pertinent results according to current legislation and technical expertise.
Acesso aberto (Open Access)
SmartLVEnergy: um framework para gestão energética inteligente e descentralizada de sistemas legados de baixa tensão
(Universidade Federal do Pará, 2024-07-11) FERNANDES, Rubens de Andrade; GOMES, Raimundo Cláudio Souza; http://lattes.cnpq.br/4244097441063312; COSTA JÚNIOR, Carlos Tavares da; http://lattes.cnpq.br/6328549183075122
Essential for technological and economic progress, electrical energy requires well-founded solutions and strategies for efficient and sustainable management. Existing consumer units, lacking modern technological resources, need gradual alternatives to optimize energy use, making the most of pre-established resources. In this context, retrofit offers an effective update for these infrastructures. Systematic models and strategies can standardize and ensure the replication of these solutions in different contexts through abstractions known as frameworks. However, there is a lack of frameworks to enable the implementation of systematic retrofit strategies for energy management, especially in the low-voltage energy sector. To fill this gap, this thesis presents the SmartLVEnergy framework, proposed to guide the design of innovative retrofit strategies to modernize legacy low-voltage installations with IoT, AIoT, and distributed computing solutions, optimizing energy management with distributed technological resources and advanced predictive capabilities. The experiments conducted in this thesis are presented in the format of aggregated scientific articles, which contributed to the conception of the SmartLVEnergy framework. As a result, it was possible to implement energy management tools in existing building and industrial scenarios in a systematic manner, based on the premises of the proposed framework. The main focus was the analysis and prediction of the energy demand of the installations and their respective circuits, allowing to anticipate and mitigate demand overrun events of the consumer units, following the guidelines of the Brazilian National Electric Energy Agency. The strategies conceived included the development, use, and integration of sensing, communication, and computing resources, distributed locally, in the cloud, and at the edge, according to the principles of the SmartLVEnergy framework, maximizing the use of existing resources according to the specific needs of each installation. The proposed framework is flexible and allows the integration, expandability, and interoperability of technological solutions across legacy systems, enabling operations according to the peculiarities and resources of each pre-existing context. This versatility confirms the relevance of this work as a robust and sustainable proposal to promote energy efficiency today, especially in legacy low-voltage systems.