Navegando por Assunto "Modeling"

Agora exibindo 1 - 11 de 11

Acesso aberto (Open Access)
Análise da aplicação de modelagem e simulação computacioal como apoio à tomada de decisão em processos produtivos industriais: estudo de caso em uma organização do segmento de duas rodas
(Universidade Federal do Pará, 2011-02-28) NOGUEIRA, Reginaldo Alves; OLIVEIRA, Roberto Célio Limão de; http://lattes.cnpq.br/4497607460894318
This study aims to analyze the resources and advantages of using modeling and computer simulation in industrial manufacturing processes as a tool to support the decision making. Thus, a case study was made at a motorcycle company located in Manaus’ Industrial Center, in which they used the software Tecnomatix® Plant Simulation. Initially, it was developed a simulation project, based on the industrial manufacture of a productive process of the variable support, an important item on the motorcycles production. This manufacture is known for its high complexity, due to the risks during its productive process. This dissertation also presents concepts related to the production management and the importance of decision making as well as the main definitions of modeling and computer simulation, with emphasis on Plant Simulation platform. Some other advantageous applications of using the modeling and computer simulation as tools have been identified, as we wrote this dissertation. However, we would rather make a restriction and just demonstrate the optimization of a manual productive process. After analyzing the simulation’s results, in multiple virtually modeled scenarios, taking into consideration the risk and productivity parameters, as well as having a systemic understanding of the situation, we considered the best option to organize would be the automated productive scenarios whose layouts allow greater interaction, flexibility, productivity and lower risk - providing the maximization of the desired results. Finally, from the analysis of the achieved results, as well as the relevant conclusions, it is easier to see clearly the advantages and resources of applying computer simulation as a support tool on the decision making in industrial manufacture processes.
Acesso aberto (Open Access)
Desenvolvimento de um sistema de alerta de enchente aplicado aos planos de defesa civil em áreas de risco no estado do Pará utilizando Sistema de Informações Geográficas (SIG), caso: cidade de Marabá
(Universidade Federal do Pará, 2012-03-02) COSTA, Jamer Andrade da; COSTA, Tony Carlos Dias da; http://lattes.cnpq.br/5776447682706171
This dissertation develops a Flood Warning System for the city of Marabá, located at the confluence of Tocantins and Itacaiúnas Rivers, 400 quilometers south from Belém, capital of the State of Pará (Brazil). The Flood Warning System is based on the hydrological model MOD-4B incorporated into a Geographic Information System. This system forecasts changes in the level of the Tocantins River throughout the year. It monitors the initiation of the flood 4 days in advance, resulting in more efficient Civil Defense actions. As reference, the forecasting model used the limnimeter poles located on the Tocantins and Araguaia Rivers, in the towns of Carolina and Conceição do Araguaia, respectively about 225 and 270 quilometers south from the city of Marabá. The system uses the GIS software ArcView 3.3, which was implemented through an interface developed through an object-oriented programming language called Avenue to run the application of the hydrological model. The use of windows and menus adapted to the model grants access to spatial data and relational database tables and / or record database. It also provides modules for spatial analysis and visualization of geographic data in a Geographic Information System (GIS), which forecasts flooding in the form of maps, charts and reports, showing the flooded areas for periods of 4, 3, 2 and 1 day before the occurrence of flooding. The system also identifies the affected streets and buildings, quantifying the affected population and the damages caused. With this, the Civil Defense can execute efficient action plans before, during and after the flooding.
Acesso aberto (Open Access)
Modelagem da disponibilidade de uma unidade geradora da UHE-Tucuruí
(Universidade Federal do Pará, 2013-07-04) MOREIRA, Pedro Igor Carvalho; NEVES, Renato Martins das; http://lattes.cnpq.br/6538317425557058
Since 2004, the regulatory rules in the Brazilian Electricity Sector has changed. The agents who act in this market have experienced a rise in new business disputes, showing an increase in competitiveness. The availability of physical assets and maintenance costs are presented as key points of these agents competitiveness. This work aims to present a methodology of Availability Analysis of Repairable Systems during the design or operational phases, covering the measurement of maintenance costs versus the acquisition costs to an expected performance level. The suggested methodology takes the System Block Diagram and exports to the Successful Tree Analysis format, composed by logic gates "AND" and "OR" where each represents a subsystem in the main system. The analyst may re-evaluate the system's topology, adding or removing redundancies in order to adjust the performance to the requirements of availability, acquisition and maintenance costs. As results of this work were identified gaps in the standards rules which defines how to control the assets performance, was established a systematic integration of modeling techniques for reliability and availability, performance indicators of Scheduled Maintenance were incorporated, different scenarios were modeled for an Oil Circulation System and was applied to an entire Hydraulic Generating Unit by modeling the critical components in the main systems.
Acesso aberto (Open Access)
Modelagem da palma de óleo na Amazônia: redução da adequabilidade climática até o final do século
(Universidade Federal do Pará, 2023-09-29) MENEZES, José Felipe Gazel; ARAÚJO, Alessandro Carioca de; http://lattes.cnpq.br/6188087583954899; https://orcid.org/0000-0002-7361-5087
The Amazon has historically suffered from deforestation. From the end of the 1960s to the present day, the occupation process has always been carried out in a disorderly manner. In addition to this fact, there are local problems characteristic of the Amazon region, such as land grabbing and invasion. Therefore, such factors help to explain why the Amazon region has extensive deforested and abandoned areas. This work highlights oil palm monoculture as an alternative to reintegrate and transform abandoned areas into productive areas. Additionally, the importance of oil palm production for the global and local market is presented, and how climate change may affect oil palm production in future scenarios. A surface model developed by the Brazilian Agricultural Research Corporation (EMBRAPA) is used to estimate oil palm production. This study was conducted in an oil palm monoculture with interspecific hybrid (HIE), generated from the cross between the species Elaeis guineensis Jacq (African) and Elaeis oleifera (Kunth) Cortés (American). Subsequently, by building a species distribution model, we estimate how areas climatically suitable for oil palm cultivation may change in the future, based on IPCC climate change scenarios.
Acesso aberto (Open Access)
Modelagem do “tempo de execução” de obras civis: estudo de caso na Universidade Federal do Pará (UFPA)
(Universidade Federal do Pará, 2010-12-06) COUTINHO, Lêda Sílvia de Aguiar Lédo; DUARTE, André Augusto Azevedo Montenegro; http://lattes.cnpq.br/1135221873341973; NEVES, Renato Martins das; http://lattes.cnpq.br/6538317425557058
The aim of this research is to propose a numerical model that treats the variable time so efficient and effective in order to meet the real needs of customers, users and society in general. However, was performed a survey bibliographic on public management, in respect of public works, statistics and operational research to the organizational system, aiming to numerical modeling. The research was based on quantitative methodologies, with emphasis on operational research for the study of public works performed under the management of PCU/UFPA. In developing the database, information was collected construction, renovations and expansions, implemented during the period 2006 to 2009, with the Permanent Commission for Bidding (CPL) and the Foundation that support the Research Development (FADESP). By linear regressions and after the transformed functions were obtained for the model prediction the statistical parameters: correlation coefficient (R) of 0.899, the coefficient of determination (R²) of 0.808, the coefficient of determination (adjusted R²) of 0.796 and error standard (Se) of 0.41. These parameters show a strong linearized correlation between the variables, indicating that 79.60% of the variability of time to execute a public work is caused or produced by variations together the area, the budgeted value, the operational capacity of IFES; operational capacity of the company; the type of service, and the season. With the results, it was concluded that it is possible to apply and implement the prognostic model for public works, considering that it is a powerful tool in its application to improvement of administrative procedures, both in structure and in its performance, whose main result is forecast variable “time of execution” for the performance of public enterprise.
Acesso aberto (Open Access)
Modelagem e simulação da operação de sistemas de geração com fontes renováveis de energia suprindo minirrede de distribuição
(Universidade Federal do Pará, 2018-01-19) FERREIRA, Andreza Cardoso; GALHARDO, Marcos André Barros; http://lattes.cnpq.br/6672470707462259; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421
This work is about the development of computational models in Simulink/Matlab workspace, that simulate the operation in islanded or grid connected mode of electrical energy distribution microgrid with hybrid resources, belonging to the Group of Studies and Development of Energy Alternatives (Grupo de Estudos e Desenvolvimento de Alternativas Energéticas - GEDAE) of Universidade Federal do Pará (UFPA), in the Campus of Belém. This paper also describes the hybrid systems and its components (generation systems, power conditioners, microgrid and proposed loads), also the mathematical models, presenting the equations of components applied to dynamic studies. Then the component models that compose the system are validated and analyzed based on the experimental data. It also presents the integration of the proposed models of the hybrid system, simulating three different strategies or modes of operation as a case study. The developed model has the function of helping these studies, simplifying the analysis and providing different possibilities of simulations in short processing time. The principal aim of the work is to make available a computational model able to simulate in detail the behavior of a hybrid system in connected or isolated of conventional power grid operation conditions.
Acesso aberto (Open Access)
Modelagem sísmica via métodos das diferenças finitas: caso da bacia do Amazonas
(Instituto Nacional de Pesquisas da Amazônia, 2009-03) FERNANDES, Lindemberg Lima; CRUZ, João Carlos Ribeiro; BLANCO, Claudio José Cavalcante; BARP, Ana Rosa Baganha
This paper discusses the seismic modeling in medium with strong discontinuities in its physical properties. The approach takes in consideration the existences diffractions and multiple reflections in the analyzed medium, which, at that case, is the Amazon Basin. The stability and boundary conditions of modeling were analyzed by the method of the finite differences. Sedimentary rocks deposited since the Ordovician to the present, reaching depth up to 5 Km. The bodies of diabasic between the paleozoic sediments are layers reaching thickness of hundred meters, which add to 90.000 km3, form the geology of the Amazon Basin. The occurrence of these structures is responsible for multiple reflections during the propagation of the seismic waves, which become impossible a better imaging of horizons located bellow the layers. The representation this geological situation was performed an (synthetic) acoustic velocity model. The numerical discretization scheme is based in a fourth order approximation of the acoustic wave equation in space and time The understanding of the wave propagation heterogeneous medium has improved for the application of the finite difference method. The method achieves a good resolution in the interpretation of seismic reflection events. The numerical results discusses in this paper have allowed to observed the influence of the multiple reflection in a high velocity layer. It increase a loss of energy and difficult the interpretation of the target. For this reason the integration of surface data with the well data is recommended, with the objective to get one better image of the targets below of the diabasic layer.
Acesso aberto (Open Access)
Otimização do processo de embarque de navios de grãos utilizando modelo de simulação: estudo de caso no complexo portuário do Itaqui
(Universidade Federal do Pará, 2023-10-20) OLIVEIRA FILHO, Landrin Sandin Gonçalves de; MORAES, Hito Braga de; http://lattes.cnpq.br/5044859479302394; https://orcid.org/0000-0003-0214-0587
The port of Itaqui, Maranhão/Brazil, consolidated its prominent position in the northern arc, being the only one to move grains in quantities above its potential, estimated to export around 12 million tons in 2020 and closed the year with 12, 1 million tons of grain moved. The growth in exports occurred with the consolidation of the 2nd phase of the Itaqui Port Grain Terminal - Tegram, added to the investments made in the expansion, with the adoption of measures to improve operationalization, with the optimization of access, the dredging of berths and access channels, providing an increase in the capacity to move 20 million tons in 2025. The present work proposes to choose the scenario among the simulated models, which presents the best results in grain ship loading operations, with the application of stochastic processes through modeling and simulation techniques using specialized software, which provides optimization of the productive capacity of the port of Itaqui. The Arena software was used to develop the model and, through two alternative scenarios, analyzes were carried out in relation to waiting times at anchorage, number of ships served and occupancy rate.
Acesso aberto (Open Access)
Previsão de distorção harmônica em cargas residenciais utilizando redes neuro-fuzzy
(Universidade Federal do Pará, 2018-07-11) MORAIS JÚNIOR, Albino Moisés Faro de; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
This work presents a modeling for THDv%, THDi% and individual harmonics using predictions from an ANFIS system that learns with measured data and predicts the behavior of the network for future values. These forecasts can help meet national THDv% standards stipulated by the Agência Nacional de Energia Elétrica (ANEEL) through Distribution Procedures (PRODIST), such as THDi% international standards, thus anticipating the currently recommended standards, but in the near future will be punitive. The modeling is performed by means of a Neuro-Fuzzy system called ANFIS, which uses neural network to learn the behavior of the system and adjustment of the parameters and Fuzzy rule for the determination of the system output values taking into account the learning of the Neural network. The great advantage of this tool is the power of modeling standards using a prediction of the harmonic state of the connected loads in the low voltage, which helps in the creation of pseudomedidas for the distribution networks, where it is difficult and costly to obtain real measurements. Among the practical applications for this tool is the use of the predicted values instead of measured anomalous values, the use in energy meters to predict and avoid exceeding the values of Harmonic Distortion stipulated in standard and the use as a basis for the prediction of individual harmonics that can be used in harmonic load flow studies.
Acesso aberto (Open Access)
Simulação computacional no auxílio à tomada de decisão nos processos industriais: utilizando a ferramenta Tecnomatix Plant Simulation 9.0
(Universidade Federal do Pará, 2011-03-01) SANTOS, Eliton Smith dos; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785
Currently there are many automated production processes, which are becoming increasingly complex according to the needs of the modern world and therefore demand phases of projects and implementation of engineering tools even more powerful to model them and analyze them the most efficient manner possible. In this environment of increasing pressure for positive results, rationalization and improvement of domestic remedies, the computational tool Tecnomatix Plant Simulation 9.0, emerges as a way to achieve competitiveness in production. Underscoring that, the proposed study is of great relevance for professionals in the production management, which aim to minimize costs and outcomes to maximize profits.
Acesso aberto (Open Access)
Soluções híbridas com uso de transformadas integrais na análise do escoamento em mancais de escora circulares
(Universidade Federal do Pará, 2014-12-15) MEDEIROS, Nielson Veloso; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785; https://orcid.org/0000-0001-9365-7498
This paper explores the modeling and solution of the Reynolds equation and simulate the problem of hydrodynamic lubrication in bearings of circular anchor shoes with Rayleigh and milled pad. Mathematical modeling of the problem of hydrodynamic flow in bearings with consideration of centrifugal inertial terms produces a modified generic equation Reynolds called Reynolds equation with inertial terms version. This equation is solved by the generalized integral transform technique (TTIG) method, where it transforms the Reynolds equation system for generating a common, endless and non- linear equations for obtaining the analytical and numerical solutions of the field of fluid film pressure, the charge and power consumed by the bearing, where these performance parameters depend on the geometry adopted for the bearing. Thus, four algorithms were originated by the transformed system, and the difference between them are the geometries chosen for the bearings, but all computer codes made use of the traditional way of TTIG. In all codes were implemented in Fortran 90/95 language and solved by routine BVPFD of IMSL (1987) library. The solution to said Reynolds equation expressed using the work dimensionless transfer potential P(r,) that was found for various combinations of dimensionless coefficients that constitute the terms of this equation. The applicability of the technique was verified by comparing the results from the use of GITT the values found by the finite volume method (FVM) in a paper published by Blanco e Prata, 1998 e 2014. Behavior of pressure fields was verified by varying the sizes of the series obtained by computer codes. The results show reasonable convergence.