Programa de Pós-Graduação em Engenharia Naval - PPGENAV/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/10054
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Navegando Programa de Pós-Graduação em Engenharia Naval - PPGENAV/ITEC por Área de Concentração "ANÁLISE DE PROCESSOS E SISTEMAS CONSTRUTIVOS NAVAIS"
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Item Acesso aberto (Open Access) Análise de esforços resultantes de impactos entre barcaças de comboios fluviais para modelagem de um sistema de amortecimento de choques utilizando teoria de análise multicorpos(Universidade Federal do Pará, 2018-03-09) CRUZ, Fernando Costa da; SOEIRO, Newton Sure; http://lattes.cnpq.br/7303174583088137; https://orcid.org/0000-0003-4224-767XIn this dissertation an analysis is performed on the operational behavior of river barges convoys in navigation regions with presence of waves, winds and currents. A study is carried out to determine the applicant forces present in the mooring elements and in the contact points between barges in flotillas when they are sailing in dangerous navigation conditions. A theoretical study is carried out, identifying the main response movements of floating bodies. In this case, a model is developed using the ANSYS AQWA 17 software to identify the stress levels from impacts between barges that make up the formations, as well as the degree and behavior of the tensile stresses present in the mooring ropes over time. In addition, a practical study is used as a comparative model of data, being very important for the validation of the results achieved by the computational model. In this way, the proposed scenario within the computational program describes environmental characteristics to describe the navigation problem in a clear way. At the end of this work the levels of effort captured within the computational model are presented, being divided into two models of fluvial flotillas, a convoy with barges for soybean transportation, and another with barges for the transport of iron ore, being discriminated the locations of the higher levels of effort. It is important to note the pioneering role of this work in relation to the problems perceived within the area of operational safety of fluvial flotillas, using Finite Element tools as the main evaluation tool.Item Acesso aberto (Open Access) Análise de viabilidade de implantação de um centro de integração logística na região amazônica: um estudo de caso no Estado do Pará(Universidade Federal do Pará, 2023-03-30) HAGE NETO, Demétrio Dib; MORAES, Hito Braga de; http://lattes.cnpq.br/5044859479302394The celebrated and constant evolution of operating operations and market companies compensate for the integration of process participants and the need to promote new operating strategies, as well as the integration of process participants, as well as the need for integration of participants in the process. process. resources involved in the supply chain. from this scenario of need for evolution and modification of market relations, the use and implementation of outstanding projects of logistics integration centers as a way of improving the logistics reality. Corroborating this reality, the main objective of this research was to verify the feasibility and benefits generated from the implementation of a Logistics Integration Center in the State of Pará - CILOG, from the perspective of the demand for production flow, availability of modal and location. To verify the feasibility of production for implementation, foam consulted without data regarding load states and load locations in adjacent areas, as well as potential, functionalities and resources of the implementation systems, with flow as the main centers of selection and, systematic and systematic way, of the feasibility and evaluation of the benefits generated from the implementation of the needs of the demand for services of attendance of the neighboring states, as well as of the entrances for the attendance of the neighboring states demand of flow of the production, availability of modals and geographic location . For this, an A-SWOT hybrid methodology was applied to define the HP location criteria and the decision factors that characterize the implementation of logistics such as the Logistics Integration Center (CILOG) in the Amazon Region, as well as the definition of the best for this implementation. , based on three local alternatives: Santarém (on the banks of the Amazon River), Alça Viária (on the banks of the Guamá River) and Miritituba (on the banks of the Tapajós River).Item Acesso aberto (Open Access) Análise numérica das distorções em soldas de topo do aço estrutural naval via elementos finitos(Universidade Federal do Pará, 2024-12-12) MOTA, João Epifânio da; LAMEIRA, Pedro Igor Dias; http://lattes.cnpq.br/5391645898597252; https://orcid.org/0000-0001-8038-8276In this research, one of the alternatives for evaluating welding distortions was to use computer simulation. A numerical analysis was then developed to determine the transverse distortion field in welded joints. The numerical simulations were carried out using commercial software, ANSYS Workbench, based on the Finite Element Method (FEM). Input parameters were entered, such as: current, voltage, welding speed and initial temperature of the virtual plate. The simulations used a virtual ASTM A36 steel plate welded using the Flux-Cored Arc Welding (FCAW) process. The influence of the geometry of the “V” and “U” bevel types on the thermal efficiency of welding, restrictions on plate distortions and heat input were verified. Although these initial simulations are qualitatively comparative, they have been validated on the basis of results from the literature, i.e. they are of quantitative importance. However, only specific results were verified that presented possibilities for combining butt joints and heat sources in structural steel. It was therefore essential to establish a sequential analysis method for adjusting the model, which would provide the main characteristics of a welding process (heat source, joint geometry, the thermodependent properties of A36 steel). The results of the analysis showed good approximation and agreement with the literature analyzed for both the temperature and deformation fields.Item Acesso aberto (Open Access) Rede neural convolucional (cnn) aplicada na análise de risco de acidentes das embarcacões que navegam nos rios da Amazônia(Universidade Federal do Pará, 2022-11-18) NASCIMENTO, Ariel Victor do; FARIAS, Valcir João Farias da Cunha; http://lattes.cnpq.br/4958123373113545; https://orcid.org/0000-0002-2564-2195; ROCHA, Marcus Pinto da Costa da; http://lattes.cnpq.br/7169569605967930; https://orcid.org/0000-0002-1849-1982Navigation safety is an important issue to maintain the well-being and integrity of passengers and cargo. There are many rules to follow to assess safety, certifiers and classifiers are responsible for ensuring compliance with all these rules that ensure the integrity of vessels, however, this is not enough. The Administrative Inquiry of Naval Accidents and Facts (IAFN), a document prepared by the Brazilian Navy, collects information and creates a database to show how many accidents occur in Brazil by region, which are defined as Naval Districts (DN). The 4th Naval District, in which the state of Par´a is located, was the first in accidents that occurred in 2020 and the third in 2021. Due to these accidents, concepts of artificial intelligence, machine learning and deep learning were used. applied in this area. In order to assist in this process, this work proposes to develop an application using Convolutional Neural Network (CNN) for image recognition (Vessels and Disc of plimsoll). In this sense, a Convolutional Neural Network (CNN) learning technique was used, which allows identifying the type of vessel through a bank of images provided, the same method was applied to identify if there is a risk of accident with the vessel through analysis of disk images of plimsoll. To carry out the training of the CNNs, six different network architectures were evaluated with: changing the number of filters in each convolutional layer; variation in the amount of convolutional layers and; use of transfer of learning from the VGG-16 network with the fine-tuning technique. The results achieved in this work are promising and demonstrate the feasibility of using the Convolutional Neural Network as a method for identifying the images of vessels as the disk of plimsoll).