Navegando por Assunto "Monitoring"

Agora exibindo 1 - 10 de 10

Acesso aberto (Open Access)
Análise de desempenho de um sistema fotovoltaico domiciliar de pequeno porte operando com diferentes equipamentos
(Universidade Federal do Pará, 2015-02-23) MAIA, Keila Cristina dos Santos; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421; MACÊDO, Wilson Negrão; http://lattes.cnpq.br/3386249951714088
This work presents the operational analysis of the operation of a 180 Wp solar home system designed to supply small loads. The solar home system is installed at the laboratory testing area of the “Grupo de Estudos e Desenvolvimento de Alternativas Energéticas” (GEDAE), in order to simulate its operation as electricity supply for a typical riparian residence of the Amazon. For this, it was simulated the use of loads that are frequently used in these homes (TV and lamps) at predefined times. Besides the description of the system components, the mechanisms for monitor its operation and to analyze the data obtained about the behavior of the system operating with different technologies of inverters (sine, square and modified square output waveforms), charge controllers and deep cycle batteries are also presented.
Acesso aberto (Open Access)
Análise do comportamento de 3 pontes mistas em obras rodoviárias sujeitas à prova de carga estática
(Universidade Federal do Pará, 2023-03-01) SILVA, Paulo Roberto Fontes da; PEREIRA FILHO, Manoel José Mangabeira; http://lattes.cnpq.br/4765401390604065; https://orcid.org/0000-0001-9622-3863; LIMA NETO, Aarão Ferreira; http://lattes.cnpq.br/0287664572311345; https://orcid.org/0000-0002-5911-1368
Along the BR 230/PA, some bridges had their constructions interrupted about 20 years ago, and with the purpose of providing evaluation criteria to the works of road bridges with mixed structure in steel and concrete is proposed the methodology above. As acceptance criteria, static load tests were used in road bridges with mixed structure through characteristic tests, through instrumentation using strain gauges and LVDT's (Linear Variable Differential Transformer), defining displacements and deformations in the structural elements of the OAE (Special Artwork Bridge), with subsequent computational modeling of the structural model of the bridge, aiming to evaluate the performance of the bridges in service, as established in the structural modeling to the core of the OAE project, which were sized for a type train TB-45 (Type Vehicle of 450 kN of total weight),, according to NBR 7188 (2013). To monitor the displacements, LVDT's were used, positioned in the middle of the span and 1/4 of the span of the central stringers, as well as the strain gage allocated in the steel beams, brace and in the CA-50 steel bars of the pillars with verification of the deformations of the referenced structural parts. As results, an evaluation of the service conditions of the bridge was performed, compressing the experimental results of the static load tests with the theoretical-computational predictions in order to validate the models used, in general, the experimentally observed deformations were less intense than the theoretical estimates. This fact corroborates the agreement with the greater rigidity of the structural elements, validating the experimental results, because they presented behavior similar to the theoretical one, however in lower intensity of the OAE's studied. Thus, the experimental and theoric-computational results were compared with the international norms being the ratios of maximum displacement, residual displacement and deformation. The experimental response showed similar behavior, for the bridges over the Arataú, Anapú and Poraquê rivers, to the theoretically predicted. Inaddition to international norms, the results were divergent, especially in the Turkish, Spanish and German countries, and the boundary conditions imposed on the norms should be imposed.
Acesso aberto (Open Access)
Análise estática e dinâmica de uma ponte ferroviária em concreto armado localizada na Estrada de Ferro Carajás
(Instituto Brasileiro do Concreto, 2010-09) TEIXEIRA, Ritermayer Monteiro; AMADOR, Sandro Diord Rescinho; OLIVEIRA, Dênio Ramam Carvalho de
This work presents results of static and dynamic analysis carried out on 593 m length bridge along Carajás railroad in Maranhão state. The bridge's behavior became important due to some changes over the static and dynamic loads once the future train will be heavier. Thus, a mathematic model was developed using the finite element method basis to evaluate its behavior and "in loco" structural moni- toring to get data as strains and vibrations when the trains go through. Several high precision accelerometers and strains gauges were placed along the slab, beams and columns. Numerical and experimental results are shown and the main conclusions validating the applied methodology are presented as well.
Acesso aberto (Open Access)
Formação para docência no ensino superior: estudos sobre os saberes docentes e os programas de monitoria
(Universidade Federal do Pará, 2016-06) SOUZA, Renato Oliveira de; NERY, Vitor Sousa Cunha
The present work aims to make a diagnosis of the scientific-academic productions, starting from thematic axes such as: Teaching Knowledge, Monitoring and Teacher Training for Higher Education. In order to do so, a bibliographical research of the productions of theses and dissertations elaborated in the period from 2006 to 2014 was systematized, in order to establish the State of the Art of these productions and, thus, to balance them according to their temporal, spatial and Theoretical. The body of work is divided into two main chapters; The first one deals with the conceptual and formative aspects of the Teaching Knowledge according to renowned authors in the area, and then presents the conceptual, historical and legal aspects of Academic Monitoring, alluding to the trajectory and transformations of monitoring throughout Brazilian history; The second chapter presents a diagnosis of the productions of theses and dissertations elaborated in Brazil, followed by their analysis. The results evidenced that there are few methodological and reference variants in the productions, but they present a great gap in the production works with the aggregation of the mentioned themes, since only one paper presents in its research the three thematic axes. In the face of everything, it is concluded that there are few productions with the aforementioned themes, perhaps due to lack of interest or information, pointing to the non-recognition of the educational potential of the monitoring activities.
Acesso aberto (Open Access)
Metodologia baseada em modelo teórico para avaliação do estado operativo de linha de transmissão
(Universidade Federal do Pará, 2015-05-15) NEGRÃO, Martin Max Luis de Castro; BARREIROS, José Augusto Lima; http://lattes.cnpq.br/1246564618922453; VIEIRA JÚNIOR, Petrônio; http://lattes.cnpq.br/1958791286192330
Conventionally monitoring operating conditions of a power transmission line is accomplished by periodic inspections along this line. This monitoring allows corrective maintenance by finding faults during the inspection. But in more efficient maintenance, predictive techniques that are characterized by real-time monitoring should be employed. The predictive techniques verify the operating status using normal function models for fault detection and fault models for the diagnosis to be employed in PDI (Fault Detection and Isolation). So, we developed a mathematical model appropriate for application to predictive maintenance of transmission line segments at low cost, without the need for sensors distributed along the line. This model allows the use of the methodology for detecting faults (PDI) by monitoring the leaka ge current of transmission lines. The use of the model also allows obtaining a new indicator of the condition of normal and abnormal functioning of a transmission line, which is the capacitance of harmonic frequencies. The model was validated through measurements obtained on a section of transmission line, by means of an artificial neural network.
Acesso aberto (Open Access)
Metodologia para diagnosticar a qualidade de energia elétrica referente à distorção harmônica em sistema trifásico de baixa tensão utilizando lógica fuzzy
(Universidade Federal do Pará, 2010-09-02) GONÇALVES, Benevaldo Pereira; COSTA JÚNIOR, Carlos Tavares da; http://lattes.cnpq.br/6328549183075122
This work emphasizes the importance of monitoring and diagnosing the quality of electric power from the viewpoint of harmonic distortion present in the electrical installation in low voltage three-phase system using a methodology to analyze and diagnose the level of harmonic disturbances evaluating the overall indicator of distortion Harmonic (THD), supported by an expert system based on a Fuzzy inference system.
Acesso aberto (Open Access)
Segurança estrutural de uma ponte ferroviária em concreto armado sobre o rio Mãe Maria
(Universidade Federal do Pará, 2010-12-21) SANTOS, Régis Rivo Ferreira dos; OLIVEIRA, Dênio Ramam Carvalho de; http://lattes.cnpq.br/1324105476558186
The study of the behavior of highway bridges has been, taking great prominence in the experimental area, because often there is a need for an increase of these mobile charges. The Company Vale, is worth form an agreement mad with the UFPA, sought to conduct studies of the resistant capacity of railway bridges that make up the Carajás raiboad, which passed to future shipments wich passed from 32 tf to 40 tf, causing considerable changes in the behavior of the structure a lack of maintenance or a maintenance of irregular reinforced concrete bridges can result pathological manifestations that can compromise safety and the risk of intervention by runoff. About the abeady discussed is the bridge over the river boiler located in the city of Marabá in the state of Pará, bridging the river identified as Mãe Maria 50A OAE, has a rectilinear path bacuted reinforced concrete cast in place consists of two spans hyperstatic totaling 64,20 m transposing the riverbeat in two spans of 20 m and cross section width of 5,85 m offering. It has become essential to assess their physical an monitoring with resistance electric gauges (slab, longitudinal beam, foundation blocks and piles, and encounters) that make up structure during the passage of trains carrying in addition to monitoring were performed as surface hardness by esclerometry and the estimation of the armature coating and the same location through pacometry, destructive tests such as extraction of test specimens to determine the tensile resistance and modulus of elasticity of concrete and the resistance to penetration testing through the carbonation of the inherent question of durability of the same to be compared with memory and calculation with three dimensional computer models developed via commercial software SAP2000® (Computers and Structures) the uses finite element method (MEF). The MEF was used to obtain the efforts enabling security checks according to standard recommendations, these comparisons are presented and discussed for the completion of the behavior of the stringers, knowing the precise structural capacity of the bridge and it’s useful life, you can ensure traffic compositions with greater safety.
Acesso aberto (Open Access)
Sistema embarcado para monitoramento de harpia (Harpia harpyja)
(Universidade Federal do Pará, 2012-07-04) PANTOJA, Breno Ramos; MANTOVANI, Jose Eduardo; http://lattes.cnpq.br/1714283455902751; KLAUTAU JÚNIOR, Aldebaro Barreto da Rocha; http://lattes.cnpq.br/1596629769697284
This Master Thesis consists of an integrated monitoring system for tracking the Harpy Eagle (Harpia harpyja), a species found in Amazon Rainforest, Cerrado and Atlantic Forest. This monitoring system can be divided in three stages: collection, storage and data transmission. The first stage embraces that collection sensors that aim at detecting the presence of birds in the nest, with the support of a camera for video capturing. The second stage executes the data pre-processing and storage. In the third stage, data transmission is performed via the Brazilian System of Ambient Data Collection (SBCDA). This work implemented some of the designed modules, building an incomplete prototype for monitoring. Techniques for embedded systems are also analyzed and the developed detector is evaluated.
Acesso aberto (Open Access)
Uso de técnicas de mineração de dados para a extração de indicação de falha na operação de hidrogeradores a partir de medidas de descargas parciais
(Universidade Federal do Pará, 2016-06-17) PARDAUIL, Ana Carolina Neves; BEZERRA, Ubiratan Holanda; http://lattes.cnpq.br/6542769654042813
By studies conducted by CIGRE in 2009, it was found that the main source of hydro generator failures is correlated to the machine electrical insulation. Due to this fact, monitoring the stator winding conditions became an important supervising procedure. A very used practice to accomplish this supervision is through the measurement and analysis of partial discharges (PDs), being this practice one of the most effective and secure methods for analysis of generator stator insulation. However, although PDs have well-defined standards, it is not trivial to classify the obtained PDs signals in these patterns, mainly due to the large number and variety of PDs occurrences. Today, the significant increase in the amount of PDs data available was due to improvements in equipment and software for PDs monitoring, as for example the system IMA-DP, which has contributed to better planned and more frequent measurement campaigns. So, this work proposes the use of an intelligent tool to facilitate the process of identification and diagnosis of partial discharges, based on data mining techniques using decision trees (DT), which is a solution for analyzing large amount of data. In the specific case presented in this dissertation it was used 2,435 measurements obtained for phase A of a hydro generator of the Tucurui Hydro Plant, which was essential to validate the proposed method, because they represent real data obtained from the Hydro Plant operation. A hybrid approach (supervised/unsupervised) was used to identify and rank PDs patterns among the well-known forms of DPs. A fast and very satisfactory PDs classification procedure was achieved, especially when converting data from statistical maps into amplitude histograms, thus, obtaining well-defined clusters and a created decision tree that achieved global indices of accuracy above 98%.
Acesso aberto (Open Access)
O uso de Veículos Aéreos Não Tripulados (VANTs) para inspenções de segurança em barragens: estudo exploratório UHE Tucuruí
(Universidade Federal do Pará, 2021-05-28) EL BANNA, Kamila Dias Bernardes; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192
The main objective of this research is to verify the applicability of remote sensing by Unmanned Aerial Vehicles (UAVs), or popularly known as (drones) to aid in the safety of security in hydroelectric dams. It highlights the role and importance of technology as a means of innovation, for this application, as an exploratory study of the UHE Tucuruí. Some signs of deterioration or cracking, for example, can only be identified with visual inspections. For this reason, they are irreplaceable in dam safety control. In this context, the use of the UAV is very useful in these inspections, since its use makes this activity faster and safer, as it allows the verification of regions of the dam that are difficult to access, thus enabling full documentation of the dam's conservation status, in addition to the possibility of adapting sensors of different types and applicability, thus helping to provide more detailed information. The UAV, used for this research, satisfactory results for the evaluations to which it was exposed. Images with adequate quality and sequences were generated, so you can easily observe all the characteristics of the dam surface, thus providing a good support in the operation activities. In addition to supporting the dam safety assessment, the images generated can be gathered and used as a basis for other photographic surveys.