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  • ItemArtigo
    Integration of design structure matrix and modular function deployment for mass customization and product modularization: a case study on heavy vehicles
    (2023-03-01) Forti, Antonio Wagner [UNESP]; Ramos, César Coutinho; Muniz, Jorge [UNESP]; Universidade Estadual Paulista (UNESP); C-ECC Chassis
    This work presents the integrating process of two modularization methods: design structure matrix (DSM) and modular function deployment (MFD), to products with many components commonly found in the automotive industry. To validate this process, the authors and a cross-functional team worked on the modularization process of an air rear suspension system for heavy vehicles with 44 components. The DSM method was used first as a screening method. Its application generated the first modules reducing the number of components, since the fewer components the product has, the less laborious the application of the MFD method, and the more suitable the results (final set of modules). Therefore, the modularization process started with the DSM method base on a binary square matrix that shows the presence or absence of relationships between pairs of components in a system. A DSM algorithm reordered the binary square matrix elements to generate the preliminary modules. That way, 26 of the 44 components were grouped into eight modules that became new components, reducing the initial number of components from 44 to 26 (44 − 26 + 8). The MFD method incorporated the customer requirements using the quality function deployment (QFD), the engineering point of view utilizing the design property matrix (DPM), and the strategies of the company employing the module indication matrix (MIM) in the modularization process. The QFD matrix, DPM, and MIM union formed the product management matrix (PMM). A dendrogram helped the cross-functional team visualize the hierarchical relationship between the DPM and MIM components and analyze the modules’ set. The cross-functional team chose seven final suitable modules considering components mounting in the assembly line and the supply chain of components too. This systematic modularization process showed up efficiently and made the work of the cross-functional team easy. Finally, the cross-functional team recommended the company board invest in knowledge management tools to assist the future cross-functional teams in replicating this modularization process in other heavy vehicle systems.
  • ItemArtigo
    Automatic inspection system of adhesive on vehicle windshield using computational vision
    (2023-02-01) Tudeschini, Rodrigo Barbosa; de Souza Soares, Álvaro Manoel [UNESP]; University of Taubaté; Universidade Estadual Paulista (UNESP)
    Polyurethane-based adhesives are applied on the windshields of vehicles in the automotive industry to fix the windshield and seal the cabin. A failure in the adhesive bead could allow water to ingress between the windshield and the vehicle body. If not detected in the leak test, it can lead to high cost due to warranty repairs, inconvenience to customers and damage to the brand. Commercial solutions are available in the market to detect an interruption in the adhesive bead right after its application on the windshield, before it is fitted to the vehicle, but at high cost. This paper proposes an automatic inspection system based on computer vision, low-cost hardware, programming in Python language and making use of open-source libraries. A batch of defect-free windshields was inspected using the proposed inspection system. In the impossibility of obtaining defective parts for validation, windshield images were modified to simulate defects and the images were evaluated by the developed algorithm. The algorithm showed quite good results at the end, and we could establish the system's effectiveness at 100% for defect detection capability and 21% of false detections.
  • ItemArtigo
    Energy production and effect of ecological efficiency on the electricity production cost of a combined cycle without/with supplementary fuel burning
    (2023-02-01) Mariños Rosado, Diego J. [UNESP]; Mendiburu, Andrés Z.; de Carvalho, João A. [UNESP]; Universidade Estadual Paulista (UNESP); Federal University of Rio Grande do Sul (UFRGS); International Research Group for Energy Sustainability (IRGES)
    The present article a natural gas combined cycle thermoelectric power plant, without/with supplementary fuel burning (SFB), was evaluated through an energetic, exergetic, environmental and economic analysis. The objective of this research is to show that the lower energy production related to the system without SFB is compensated by the higher environmental efficiency. The evaluations were carried out to determine the global efficiency and the energy benefits/losses from the different equipment. The environmental analysis determined all emissions, pollution indicator (Πg), and ecological efficiency (ε) considering the international air quality standards. Finally, the economic analysis determined the expected annual benefit due to the pay-back and the electricity production cost (PCEE), incorporating the effects of the environmental impacts. When developing the present study, the system without/with SFB evidenced a global efficiency of 50.81 % vs 47.39 %, respectively. In addition, the system without SFB showed better results of exergetic efficiency and irreversibility, its Πg and ε were 0.056 kg/MJ and 93.2 %. While its total emissions were 16 % lower. The economic analysis verified the annual benefit due to the pay-back for an annual interest rate of 4 %, 8 % and 12 %, and the PCEE showed an increase between 10 % and 12 % in the case with SFB.
  • ItemResenha
    Variables Influencing the Production of Door Jambs from Pinus taeda EGP Panels
    (2023-02-01) Dias, Romulo R. [UNESP]; Alves, Manoel C. S. [UNESP]; Deus, Priscila R.; Vieira, Fabio H. A.; Universidade Estadual Paulista (UNESP); Faculty of Technology
    The influence of coverslip width and the physical arrangement of growth rings were studied relative to laterally glued Pinus taeda wood panels (EGP) used in the manufacture of door jambs, according to the requirements of ABNT-NBR 15.930 (2011). The goal was to determine the combination providing the best physical performance of the product. The experiments used the complete factorial design for two factors and four levels, i.e., 32, 56, 75, and 112 mm width coverslips, and rings arrangement of radial, tangential, cross coverslips, and ones with finger joints. A total of 48 EGP door jamb specimens (3 for each combination) measuring 2120 x 220 x 32 mm, with moisture content between 8% and 12% and apparent density between 400 and 600 kg.m-3 were used. Statistical analysis of variance (ANOVA) was used to investigate the influence of factors and their interactions on the following responses: visual aspect, moisture, density and dimensional (width and thickness) variations. It was found that both factors and their interactions influenced the level of significance of 1% on shape deviations. The best results were for panels produced with 32 and 56 mm coverslips, with cross or radial arrangement.
  • ItemArtigo
    CHARACTERIZATION OF Acrocarpus fraxinifolius WOOD SUBMITTED TO HEAT TREATMENT
    (Univ Bio-bio, 2022-01-01) Oliveira, Carolina A. Barros [UNESP]; Oliveira, Karina A. de [UNESP]; Moura Aquino, Vinicius Borges de; Christoforo, Andre Luis; Molina, Julio C. [UNESP]; Universidade Estadual Paulista (UNESP); Fed Univ Southern & Southeastern Para; Universidade Federal de São Carlos (UFSCar)
    Aiming to provide greater visibility for the wood species Acrocarpus fraxinifolius, the present study sought to analyze the influence of heat treatment on an industrial scale applied to wood species, also popularly known as Indian cedar. The heat treatment was carried out in an autoclave, with temperature and pressure control, and with saturated steam injection, for temperatures 155 degrees C, 165 degrees C, 175 degrees C, and 185 degrees C. Physical, chemical, and mechanical tests were carried out for the analyzed wood. The content of holocellulose and total lignin decreased, while the content of extractives showed a substantial increase. The density increased after the heat treatment, however the treated wood showed cracks, and these cracks influenced the significant loss of the values of the mechanical properties of compression, tension, and flexion. The shear showed strength gain for the temperature of 155 degrees C, and the wood treated at 165 degrees C was equivalent to untreated wood. The woods submitted to temperatures of 175 degrees C and 185 degrees C presented strength losses. The heat treatment in question contributes to increase the visibility, use and market value of wood.
  • ItemTrabalho apresentado em evento
    A Polynomial Equation Model for Fatigue Crack Propagation in an Aeronautical Steel Material
    (2022-01-01) Alvarado-Silva, Carlos Alexis; de Oliveira, Geraldo Cesar Rosario [UNESP]; Gamarra-Rosado, Victor Orlando [UNESP]; Silva, Fernando de Azevedo [UNESP]; Technological University of Peru – Industrial Engineering; Universidade Estadual Paulista (UNESP)
    The model widely used in the fatigue crack growth study in materials science and fracture mechanics is the Paris-Erdogan, which relates the stress intensity factor with the subcritical crack growth, under a fatigue regime. In this work, a seven degree polynomial is used as an alternative to model the crack propagation behavior and to be able to analyze the three regions charts of the cycles by load, in contrast to the common model that it performs at a slight approximation of the propagation phase of the trinca (region II). Finally, a comparison has been made between the proposed model and the secant method by the ASTM 647,2000 standard that adjusts the points obtained experimentally. This proposed equation is new as another alternative analytical model for which the adjustment parameter “R” are compared in relation to the classical approach in a aeronautical ABNT 4130 steel.
  • ItemArtigo
    Influence of the Addition of Al2O3 Nanoparticles and the Duration of Pressing on the Physical Properties of OSB Panels
    (2022-01-01) Lima, Felipe O. [UNESP]; Silva, Luana Cristal L. [UNESP]; Ferreira, Bruno S. [UNESP]; de Morais, César Augusto G. [UNESP]; Bertolini, Marília da S. [UNESP]; Barreiros, Ricardo M. [UNESP]; Azambuja, Maximiliano Dos A. [UNESP]; Caraschi, José Claudio [UNESP]; Favarim, Higor R. [UNESP]; Campos, Cristiane I. [UNESP]; Universidade Estadual Paulista (UNESP)
    For greater durability, materials must withstand contact with water, making it difficult for biodegrading agents to attack. The present study produced and evaluated the heat transfer for two pressing times and the physical properties of OSB panels, produced with pinewood strands and Al2O3 nanoparticles addition. The nanoparticles were synthesized through the sol-gel-protein method and added to the resin in the proportion of 0.5%. During the pressing process, heat transfer and distribution in the central region of the particle mat were evaluated using a type K thermocouple. After its fabrication, the panels were characterized to evaluate density, moisture content, thickness swelling, and water absorption. The results obtained indicated that the nanoparticle addition caused a refractory effect in the central region of the mat, leading to a small reduction in the pressing temperature for the 600 s cycle. However, there was no compromise in resin cure, indicating good interaction of the panels with nanoparticles in water contact, for both pressing times. There was an improvement in the panel thickness swelling with the addition of 0.5% of Al2O3 nanoparticles, with all properties meeting the Class 1 indicators of the EN 300 (2006) standard.
  • ItemArtigo
    Life cycle assessment as a guide for designing circular business models in the wood panel industry: A critical review
    (2022-06-25) Araújo, Cristiane Karyn de Carvalho [UNESP]; Bigarelli Ferreira, Mariane; Salvador, Rodrigo; Araújo, Camilla Kawane Ceciliano de Carvalho [UNESP]; Camargo, Bruno Silva [UNESP]; Camargo, Sâmique Kyene de Carvalho Araújo [UNESP]; Campos, Cristiane Inácio de [UNESP]; Piekarski, Cassiano Moro; Universidade Estadual Paulista (UNESP); Universidade Tecnológica Federal do Paraná (UTFPR); Technical University of Denmark (DTU)
    The objective of the present study is to use life cycle assessment (LCA) to guide the design and implementation of circular business models (CBM) in the wood panel industry towards a cleaner production. Initially, searches in the literature were carried out to select articles on LCA of wood panels, to investigate the possible synergies between LCA and CBMs in the wood panel industry. Investigations of the production system of reconstituted wood panels, with regard to both the biological and technical cycles, allowed spotting signs of existing circularity in some parts of the manufacturing stage, such as the use of wastes for combustion and generation of energy, and the use of ash from combustion processes. In order to reduce impacts, identified via LCA, CBMs for the wood panel sector were proposed, seeking to reduce the impacts identified via LCA and fill the circular gaps left by existing practices.
  • ItemArtigo
    Possible pathways for oil and gas companies in a sustainable future: From the perspective of a hydrogen economy
    (2022-05-01) Hunt, Julian David; Nascimento, Andreas; Nascimento, Nazem [UNESP]; Vieira, Lara Werncke; Romero, Oldrich Joel; Federal University of Espírito Santo; Universidade Estadual Paulista (UNESP); Federal University of Rio Grande Do Sul
    Before the COVID pandemic, oil and gas companies invested only a small fraction of their capital on sustainable energy technologies. With the substantial improvement in the performance of batteries and their rapid cost reduction, the oil and gas industry could potentially lose a large share of their market in the transport sector. A similar shift in energy sources is happening with the surge in renewable energy sources to supply electricity, heating and cooling. In an ever more sustainable future, the need for an oil and gas industry could reduce significantly. This paper reviews the possible paths that an oil and gas company could follow to become a sustainable development corporation and continue to be relevant in the future. This paper aims to describe alternative sustainable pathways such as the extraction of natural hydrogen, a hydrogen economy, offshore wind power, deep sea mining, biorefineries, seawater air-conditioning, geothermal and geoengineering. This paper also proposes the use of electrolysis ships for the flexible production of green hydrogen and showed that its investment cost can be three times smaller than in fixed electrolysis plants. The oil and gas industry has substantial intellectual, financial capital and geopolitical influence that would not be lost during a shift to a more sustainable world. Indeed, these assets should be used to facilitate the transition to a more sustainable future.
  • ItemArtigo
    Failure criteria assessment of carbon/epoxy laminate under tensile loads using finite element method: Validation with experimental tests and fractographic analysis
    (2022-01-01) Marques, Bruno Mikio Fujiwara [UNESP]; Marques, Thaís Peres Zanetine; Silva, Fernando de Azevedo [UNESP]; Cândido, Geraldo Maurício; Rezende, Mirabel Cerqueira; Universidade Estadual Paulista (UNESP); IFSP; Universidade de São Paulo (USP); ITA
    The failure of polymer composites is complex due to the independent and interacting damage mechanisms. The availability of several failure criteria demands a reasonable discernment of each criterion in order to obtain a consistent response to make an assertive selection. The importance of this decision is present in simulation works using finite element method and it is of particular interest of the industry and designers, once an optimized project is the goal. This study regards a carbon/epoxy laminate based on plain weave fabric subjected to tensile load and numerical simulations using finite element method was applied to compare the widely used Maximum Stress, Tsai-Wu, Hoffman, Tsai-Hill, Hashin and Puck failure criteria. Experimental tensile tests were carried out and fractographic analysis was performed in order to validate the finite element model and the applicability of the failure criteria. The model presented a good agreement with the experimental results and the correlation between the fractographic analysis and the failure criteria results allowed to select the Puck criterion as the proper and adequate for the studied composite laminate subjected to tensile load.
  • ItemTrabalho apresentado em evento
    Wear particle classifier system based on an artificial neural network
    (2010-06-01) Gonçalves, Valdeci Donizete [UNESP]; De Almeida, Luis Fernando; Mathias, Mauro Hugo [UNESP]; Universidade Estadual Paulista (UNESP); UNITAU - TAUBATÉ University
    This paper describes a method to identify morphological attributes that classify wear particles in relation to the wear process from which they originate and permit the automatic identification without human expertise. The method is based on the use of Multi Layer Perceptron (MLP) for analysis of specific types of microscopic wear particles. The classification of the wear particles was performed according to their morphological attributes of size and aspect ratio, among others. © 2010 Journal of Mechanical Engineering.
  • ItemArtigo
    Geoprocessamento para identificar padrões do perfil de nascimentos na região do Vale do Paraíba
    (2009-04-01) Hau, Lin Chen; Nascimento, Luiz Fernando Costa; Tomazini, José Elias [UNESP]; Hospital Universitário de Taubaté - HUT; Universidade de Taubaté - UNITAU; Universidade Estadual Paulista (UNESP)
    PURPOSE: to apply geoprocessing techniques for the spatial birth profile analysis of each municipality. METHODS: ecological and exploratory study, using data from the Health Information System about born alive babies in 2004, and using geoprocessing techniques. The spatial autocorrelations of the variables: cesarean section, mother's schooling, low birth weight, Apgar score at five minutes, prematurity, number of medical appointments and adolescent mothers, besides the map with the index of human development were estimated. For the detection of spatial events aggregates, Moran's IM statistics, through the program Terra View 3.13 (developed by INPE and available to the public) was used. Spatial maps with those variables were built, and Pearson's correlation coefficients, estimated. RESULTS: results have shown that the rate of born alive babies, from mothers with school level over primary school and from cesarean sections, presented a spatial pattern visually identifiable and significant spatial self-correlation. Low birth weight, prematurity, Apgar score, number of pre-natal appointments and adolescent mothers have presented a random spatial pattern, showing that, in this analysis scale, those markers have not discriminated the risk groups, despite their unquestionable predictive value for children's morbidity-mortality at individual level. There has been a positive correlation between cesarean section and schooling, and between cesarean section and human development index; and a negative correlation between adolescent mothers and human development index, with statistical significance (p<0.05). CONCLUSIONS: this methodology has allowed us to identify spatial clusters for the variables cesarean section and mother's schooling, besides deepening our knowledge on birth profile in the municipalities, presenting good potential on how to direct actions for specific areas.
  • ItemArtigo
    Cassava Waste Torrefaction for Energy Purposes
    (2022-01-01) Granado, Marco Paulo P. [UNESP]; Machado, Gabriel T.; Padilla, Elias R. D. [UNESP]; Yamaji, Fábio M.; De Conti, Andrea C. [UNESP]; Universidade Estadual Paulista (UNESP); Universidade Federal de São Carlos (UFSCar)
    Biomass torrefaction consists of a heat treatment process that by slow heating of the material promotes the release of moisture and volatile constituents of low molecular weight. In this work, the objective was to carry out the torrefaction process in cassava rhizome in order to analyze its effect on the energy properties of the waste. The residue collected in natura was dried, ground and torrefied in two different forms: with granulated material and with material densified in briquettes; performing a torrefaction process at temperatures of 200 and 300 °C, with torrefaction time of 30 and 60 minutes. According to results, the cassava rhizome torrefaction can increase its initial high heating value of 16.3 MJ/kg from 21 to 51%, and decrease from 81% to 42% its volatile content; while torrefied briquettes showed little variation in their properties, except for the briquettes torrefied at 300 °C for 60 minutes. Therefore, when performing torrefaction of densified biomass, there is a need to use higher temperature and longer torrefaction time when compared to granular biomass.
  • ItemTrabalho apresentado em evento
    Influence of drilling parameters on thrust force and burr on fiber metal laminate (Al 2024-T3/glass fiber reinforced epoxy)
    (2020-01-01) Bonhin, Eduardo Pires [UNESP]; David-Müzel, Sarah [UNESP]; Guidi, Erick Siqueira [UNESP]; Botelho, Edson Cocchieri [UNESP]; Ribeiro, Marcos Valério [UNESP]; Universidade Estadual Paulista (UNESP)
    In the present work a fiber metal laminate (FML) of three aluminum sheets interspersed with eight layers of glass fiber reinforced epoxy was used. The processes were carried out using 4000 and 8000 rpm and a 0.05; 0.10 and 0.20 feed in mm/rev with a coated carbide drills (TiAlN) with Ø4.8 mm. With the found results, it could be stated that the thrust force was affected significantly by the feed with 99.75% of contribution, the burrs thickness was influenced by spindle speed and feed (27.59% and 63.14% respectively), and burrs height by feed and interaction between factors (21.33% and 75.76%).
  • ItemArtigo
    Numerical and Experimental Analysis of Wood Tensile Strength Perpendicular to the Grain
    (2022-01-01) Silva, Joäo Vítor Felippe [UNESP]; de Araujo, Patrik Luiz Silva [UNESP]; de Oliveira, Karina Aparecida [UNESP]; Silva, Maria Fernanda Felippe [UNESP]; Oliveira, Carolina Aparecida [UNESP]; Molina, Julio Cesar [UNESP]; Universidade Estadual Paulista (UNESP)
    The Brazilian Code ABNT NBR 7190 (1997) is currently under review process and one of the proposals is the change and add of some test procedures. Several specimen geometric configurations and test conditions have been evaluated by the study committee CE-02:126.10. The aim of this paper was the analysis of the tensile strength perpendicular to the grain through the current Brazilian Code and from an adaptation of ISO 13910 (2005). Pine and Indian Cedar were used and simplified relationships were proposed. Numerical simulations were performed to identify the stress distributions in the specimens. The results obtained by ISO 13910 (2005) did not differ statistically for the two species. Brazilian standard method cedar had a higher strength value than pine. The simplified ratios obtained ranged between 0,017 and 0,123. The numerical simulations of ISO 13910 (2005) specimens showed predominant failure by tension in the lower fiber due to stress concentration.
  • ItemArtigo
    Inhibition effects of ionic and non-ionic derivatives of imidazole compounds on hydrogen permeation during carbon steel pickling
    (2022-01-01) Silva, Matheus G.; de Araujo, Rodrigo G.; Silvério, Raquel L.; Costa, Alberto N.C. [UNESP]; Sangi, Diego P.; Pedrosa, Leandro F.; da Fonseca, Gláucio S.; da Silva, Ladário; Coelho, Lilian W.; Ferreira, Elivelton A.; Universidade Federal Fluminense (UFF); Universidade Estadual Paulista (UNESP); Companhia Siderúrgica Nacional (CSN); Escola de Engenharia Industrial e Metalurgia de Volta Redonda
    Hydrogen embrittlement can occur when atomic hydrogen is absorbed by steel during the acid cleaning process. In the literature, studies of corrosion inhibition by organic compounds in acid solutions have not given attention to the inhibition of hydrogen permeation in the steel. In this work, we show that the best corrosion inhibition does not always indicate the best hydrogen permeation inhibition. For the first time, imidazole-based compounds were studied as hydrogen permeation inhibitors during carbon steel pickling in hydrochloric acid at high concentration (5.4 mol L−1). The immersion of steel in solutions containing 250 mg L−1 of the inhibitors 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) resulted in low corrosion inhibition efficiency of approximately 18% in both cases. On the other hand, the hydrogen permeation inhibition efficiency was 59%. The addition of 2-(nitromethylene) imidazolidine (IMD) and 2-(nitromethylene) oxazolidine (OXA) to HCl solutions provided corrosion inhibition efficiencies of 46.7% and 24.4%, respectively. However, these compounds did not present hydrogen permeation inhibition effects.
  • ItemResenha
    Towards a green industry through cleaner production development
    (2022-01-01) de Mello Santos, Vitor Homem [UNESP]; Campos, Thalita Laua Reis [UNESP]; Espuny, Maximilian [UNESP]; de Oliveira, Otávio José [UNESP]; Universidade Estadual Paulista (UNESP)
    The growth in global production and consumption rates has resulted in increased pollution generation by industrial companies. To this end, cleaner production is one of the most widely used strategies to reduce the environmental impacts of industry and gain competitive advantage. However, it is still adopted slowly in many places. Therefore, the objective of this study is to propose a framework composed of governmental, scientific, and industrial strategies, policies, initiatives, and research opportunities for the development of cleaner production. The best practices of the top countries in the cleaner production technical-scientific scenario and the main implementation challenges and opportunities for its scientific development were identified and were the reference for the framework proposals. In the government sector, the framework suggests actions to encourage the adoption of cleaner production practices through national policies, legislation, tax incentives, and educational campaigns. In the scientific sector, it suggested the development of studies about the factors that motivate its adoption, studies about clean technologies, and studies about the cleaner production implementation difficulties. In the industrial sector, it highlighted the importance of the engagement of upper management to focus on efforts to increase the efficiency of manufacturing processes with the adoption of clean technologies, management systems, strengthening of the research and development areas, and replacement of hazardous raw materials. Thus, this study contributes with initiatives that will help the implementation of cleaner production practices, reducing the generation of pollution in industry, increasing the efficiency of its processes, and aligning countries and societies to sustainable development.
  • ItemArtigo
    Industrial internship mentoring model for industrial engineering education in public universities
    (2020-01-01) De Almeida, Maria Da Glória Diniz [UNESP]; Marins, Fernando Augusto Silva [UNESP]; Salgado, Andreia Maria Pedro [UNESP]; Bittar, Rita De Cássia Da Silveira Marconcini; De Barros, Joséglênio Medeiros; Junior, Antonio Henriquesdearaújo; De Souza Sampaio, Nilo Antonio; Da Fonseca, Bernardo Bastos; Baronto, Gessica Naira Diniz; Côrtes, Andresa Deoclidia Soares; Universidade Estadual Paulista (UNESP); Rio de Janeiro State University; Universidade Estadual de Campinas (UNICAMP)
    This article aims to present an industrial internship mentoring model for undergraduate industrial engineering education in public universities. The study proposed that the constructs of ''mentoring'' and ''industrial engineering education'' can be combined in order to develop a model for teaching. Its reliability has been confirmed by Cronbach's coefficient test, whereas the statistical hypothesis test has confirmed the validity of the model according to the opinion of 52 pairs of mentors and mentees participating in this applied research with a qualitative methodological approach using a combination of case study and survey. Regarding results, 85% of mentees stated that the model had made a significant positive difference during their internship period, while mentors confirmed that 98% of mentees developed industrial engineering skills and abilities. Thus, the model relies on a detailed procedure about the content that should be assessed in each phase. Its major contribution lies in its pioneering role in developing an industrial internship mentoring model for industrial engineering education and in bringing universities and industries closer together during internship periods.
  • ItemTrabalho apresentado em evento
    Effects of nitriding and shot peening treatments and stress concentration on the fatigue strength of AISI 4340 steel
    (2001-01-01) Siqueira, Célio P.; Pereira, Celso P. M. [UNESP]; Nascimento, Marcelino P.; Voorwald, Herman J. C.; Souza, Renato C.; Universidade Estadual Paulista (UNESP); Materials Department - DEMAR/FAENQUIL
    Nitriding is a thermochemical surface treatment applied to improve the fatigue and wear resistances of mechanical components. Shot peening is a cold work process in which small spheres impact the surface of a piece, producing small dimples due to superficial fibbers yielding by tension and producing a compressive residual stresses field below the dimples. Many of the material fractures are caused by fatigue as a result of inadequate projects, involving stress concentrations, or from any notch produced during process of manufacture or maintenance from equipment. The aim of this study was to analyse the effects of nitriding and shot peening surface treatments, as well as stress concentrations induced to simulate machining errors, on the rotating bending fatigue behaviour of AISI 4340 high strength steel. Copyright © 2001 Society of Automotive Engineers, Inc.
  • ItemArtigo
    Development of diagnosis system for rolling bearings faults on real time based on FPGA
    (2012-04-01) Kashiwagi, M. [UNESP]; da Costa, C.; Mathias, M. H. [UNESP]; Universidade Estadual Paulista (UNESP); IFSP – Fedral Institute of Science Education and Technology
    The real-time monitoring of events in an industrial plant is an advanced technique that presents the real conditions of operation of the machinery responsible for the manufacturing process. A predictive maintenance program includes various rotating machinery condition monitoring techniques of the machine to determine the conditions of failure. To increase the operational reliability and to reduce preventive maintenance, it is necessary an efficient tool for analysis and process monitoring, in real time, enabling the detection of incipient faults for rolling bearings. Over the past few years there has been a major technological developments related to digital system, including innovations in both hardware and software. These innovations enable the development of new design methodologies that take into account the ease of future modifications, upgrades and expansions of the designed system. This paper presents a study of new design tools for embedded digital systems based on open hardware architecture with reconfigurable logic. Will be discussed a case study in the area of fault detection of rolling bearings, as well as its implementation and testing.