Relevant bibliographies by topics / FDM RepRap

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'FDM RepRap'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "FDM RepRap"

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Harušinec, Jozef, Andrej Suchánek, and Mária Loulová. "Creation of prototype 3D models using RAPID PROTOTYPING." MATEC Web of Conferences 254 (2019): 01013. http://dx.doi.org/10.1051/matecconf/201925401013.

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The article deals with creating 3D models using RAPID PROTOTYPING technology. At present, we are witnessing the integration of new technologies into ordinary life. A good example is the use of FDM (fused deposition modeling) technology that primarily uses thermoplastics to create 3D models. A few years ago, the use of rapid prototyping technology was a prerogative of companies, research institutes and a narrow group of universities. Technologies such as FDM and STL (Stereolithography) have become affordable in the past few years for smaller businesses and individuals. The specific segment is the replicating rapid prototype RepRap (replicating rapid prototype), the extended version of which is the Prusa i3 printer.
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Добролюбова, Марина Валеріївна, Анна Василівна Шнира, Богдан Володимирович Чапалюк, and Андрій Іванович Алімов. "Monitoring and control system for RepRap 3D-printer with FDM printing technology." Information systems, mechanics and control, no. 14 (April 25, 2016): 5–15. http://dx.doi.org/10.20535/2219-380414201672548.

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Burde, Alexandru Victor, Cristina Gasparik, Sorana Baciu, Marius Manole, Diana Dudea, and Radu Septimiu Câmpian. "Three-Dimensional Accuracy Evaluation of Two Additive Manufacturing Processes in the Production of Dental Models." Key Engineering Materials 752 (August 2017): 119–25. http://dx.doi.org/10.4028/www.scientific.net/kem.752.119.

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In the current orthodontic and prosthodontics practice, study models made of plaster are being used to provide a three-dimensional view of the patient’s occlusion and allow the clinician to analyze, diagnose, or monitor anomalies. With the introduction of intraoral and extra oral digital impressions, it is now possible to obtain digital study models of the patients’ dental arches. Digital models can be obtained in a physical hardcopy via 3D printing or rapid prototyping. Although, professional 3D printers require a high initial set-up cost, low cost 3D printers can provide similar quality products. The aim of this study is to investigate the accuracy of physical dental models reconstructed from digital data by two rapid prototyping techniques. For this purpose twenty mandibular and maxillary conventional plaster models from randomly chosen subjects were selected and served as the gold standard. The casts were digitized using a 3D scanner and .stl surface models were acquired; the virtual model was adjusted for reconstruction using dedicated software, thus obtaining the CAD model of the casts. The CAD models were reconstructed using a 3D fused deposition modeling (FDM) printer, a RepRap FDM printer and an inverted stereolithography printer. The reconstructed models were digitized using a laboratory 3D scanner and the resulting Mesh datasets were compared with the CAD model using inspection software. The mean systematic differences for the 3D comparison of the reconstructed models were 0.207 mm for the stereolithography models, 0.156 mm for the FDM models, and 0.128 mm for the RepRap models. Although a technology proved the ability to manufacture a dental model with accentuated morphology, the results demonstrate that replicas of plaster casts are influenced by problems linked to the size of the detail to be reproduced, which is often similar to or finer than the fabrication layer.
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Šafka, Jiří, Michal Ackermann, Jiří Bobek, Martin Seidl, Jiří Habr, and Luboš Bĕhálek. "Use of Composite Materials for FDM 3D Print Technology." Materials Science Forum 862 (August 2016): 174–81. http://dx.doi.org/10.4028/www.scientific.net/msf.862.174.

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This article deals with specific polymer composites modified for the Fused Deposition Modelling (FDM) which is a 3D print technology. These two phase systems involve thermoplastic matrix filled with natural fibres. The crucial demand of this progressive technology is put on the accuracy of the semi-product formed into the filament shape. To reach the smooth production of 3D prototypes the filament should have a constant diameter. In the article, individual steps of the polymer composite pelletization and following pre-processing and processing activities are described. Among these steps the extrusion of the filaments belongs and subsequent print test on “RepRap” device accompanied by optimization of building parameters. Tensile specimens were chosen for print with regard to maps mechanical properties of this newly developed material which was the final stage of this work. Tensile test curves were then compared with those graphs which can be found for the material produced by conventional technologies such as injection moulding.
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Khan, Shaheryar Atta, Bilal Ahmed Siddiqui, Muhammad Fahad, and Maqsood Ahmed Khan. "Evaluation of the Effect of Infill Pattern on Mechanical Stregnth of Additively Manufactured Specimen." Materials Science Forum 887 (March 2017): 128–32. http://dx.doi.org/10.4028/www.scientific.net/msf.887.128.

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Additive manufacturing has stepped down from the world of Sci-Fi into reality. Since its conception in the 1980s the technology has come a long way. May variants of the technology are now available to the consumer. With the advent of custom built (open source) Fused Deposition Modeling based printing technology Fused Filament Fabrication (FFF), FDM/FFF has become the most used Additive Manufacturing technology. The effects of the different infill patterns of FDM/FFF on the mechanical properties of a specimen made from ABS are studied in this paper. It is shown that due to changes in internal structures, the tensile strength of the specimen changes. The study also investigate the effect of infill pattern on the build time of the specimen. Extensive testing yielded the optimal infill pattern for FDM/FFF. An open source Arduino based RepRap printer was used for the preparation of specimen and showed promising results for rapid prototyping of custom built parts to bear high loads. The study can help with the increase in the use of additive manufacturing for the manufacturing of mechanically functioning parts such as prosthetics
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Panda, Anton, Ema Nováková-Marcinčinová, Ľudmila Nováková-Marcinčinová, Tibor Krenický, and Tadeusz Zaborowski. "Production from PLA Materials Processed Vertically by FDM Method RP Technology." Key Engineering Materials 756 (September 2017): 80–87. http://dx.doi.org/10.4028/www.scientific.net/kem.756.80.

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The article is focused on the aspects in samples production of sophisticated material – PLA - PolyLacticAcid, PLA plastic. The main part of the work focuses on experimental production and testing of PLA material - PolyLacticAcid plastic, printed on RepRap 3D device that works on the "open source" principle. The article presents the outcomes of test materials in the form of measurement protocols recorded in the software, the measured values ​​in a static tensile test, marked down in tables and shown in work graphs. The article describes selected and carried out tests of mechanical properties of PLA plastics extruded in different directions in this case carried out vertically by FDM rapid prototyping method of two PLA materials such as pure without additives blended with blue dye. The tests are mainly focused on the determination of ultimate tensile strength. Based on the results obtained, the samples made of two PLA materials were compared in the end to establish which produced PLA material sample is stronger. There are outputs in the form of logs, charts and tables that provide information about the executed tests and comparisons, which were made by the authors.
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Pan, Ai Qiong, Zi Fan Huang, Rui Jie Guo, and Jun Liu. "Effect of FDM Process on Adhesive Strength of Polylactic Acid(PLA) Filament." Key Engineering Materials 667 (October 2015): 181–86. http://dx.doi.org/10.4028/www.scientific.net/kem.667.181.

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Fused deposition modeling (FDM) is one of the most widely used technologies in rapid prototyping. On the principle of layered manufacturing, the melted polymer filament is extruded and formed. In order to achieve transition from nonfunctional prototypes to functional prototypes of FDMed models, using the RepRap Kossel delta 3D printer and 1.75mm diameter polylactic acid (PLA) filament, it was analyzed that the effects of the nozzle moving rate and slice thickness on adhesive strength based on the existing technology research by orthogonal test. The experiment results indicated that adhesive strength of filament increased both with the nozzle moving rate and with its slice thickness. The latter induced increase more significantly. Finally, comprehensive experiments had been performed to quantitatively study the adhesive strength variation with the filling rate, which provides data reference for setting proper filling rate. Reasonable filling rate setting can not only satisfy the strength requirement without debasement of printing quality, but also reduce filament consumption, improve the manufacturing efficiency and provide important instruction significance for actual printing.
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L. Melgoza, Evila, Guillem Vallicrosa, Lidia Serenó, Joaquim Ciurana, and Ciro A. Rodríguez. "Rapid tooling using 3D printing system for manufacturing of customized tracheal stent." Rapid Prototyping Journal 20, no. 1 (January 14, 2014): 2–12. http://dx.doi.org/10.1108/rpj-01-2012-0003.

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Purpose – This work aims to present the design of a new continuous tool-path strategy for open-source low-cost fused deposition modeling (FDM) machines, such as Fab@Home or RepRap; and the development of an innovative integrated tool to design and fabricate customized tracheal stents with any FDM machine and six patient parameters. Both contributions were validated and implemented by obtaining a customized medical-grade silicone tracheal stent. Design/methodology/approach – For the design of the new deposition strategy, a Python programming language was used. The new tool-path strategy was proposed as a continuous path to avoid drops and gaps and to improve the accuracy of the final model. Meanwhile, patient parameters were obtained by medical doctors and introduced into the innovative integrated system. On the one hand, one mold generated automatically, and viewed with Matlab® software, was fabricated with a Fab@Home machine, optimized with the continuous tool-path strategy. On the other hand, the same generated mold was viewed in SolidWorks/Excel software and was fabricated using a commercial FDM machine. Finally, the mold was filled with medical grade silicone, and a silicone tracheal stent was obtained. Findings – Path planning for extrusion technologies is still a major concern, especially for open-source FDM machines. The results obtained in this work show the benefits of applying the newly developed continuous tool-path strategy to optimize the performance and efficiency of these machines. In addition, the proposed innovative integrated system allows the fabrication of customized tracheal stents rapidly and affordably. Practical implications – The possibility of obtaining customized tracheal stents is a worthy challenge. Medical doctors could play a more active role and interact during the design process, helping to obtain more suitable stents. The method proposed herein would provide the opportunity to obtain real values from the trachea of a patient in the operating room and quickly fabricate a customized stent that would fit the patient's trachea perfectly. Originality/value – The results obtained in this work are relevant and have future applications in both the medical and the additive manufacturing fields. The optimized tool-path strategy can help to improve and enhance the use of low-cost FDM machines. Moreover, the innovative automatic design approach to fabricate tracheal stents may open new market opportunities in the medical device field.
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Sukindar, Nor Aiman, Mohd Khairol Anuar Mohd Ariffin, B. T. Hang Tuah bin Baharudin, Che Nor Aiza Jaafar, and Mohd Idris Shah Ismail. "Comparison on Dimensional Accuracy Using a Newly Developed Nozzle for Open-Source 3D Printer." Applied Mechanics and Materials 859 (December 2016): 15–19. http://dx.doi.org/10.4028/www.scientific.net/amm.859.15.

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Fused Deposition Modeling (FDM) or also known as RepRap (Replicating Rapid Prototyper) is a technology that is synonym with 3D printing. This technology has entered a new era with an increasing demand among the community. It has grown commercially in the market of open-source system and it is relatively low cost. Many efforts have been put towards the development of the system in both hardware and software to increase the quality and the performance. The research highlights the development of a new nozzle to evaluate the performance on dimensional accuracy in comparison to the original nozzle. The nozzle emphasizes the die angle for the polylactic acid (PLA) material, the liquefier design which provide constant heat in the liquefier chamber, as well as insulator for the liquefier using highly insulated material. The dimensional accuracies of both nozzles were compared where the result showed that the new nozzle provided better accuracy and stability on the extruding PLA material.
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Firshein, Janet. "Repeal of FDA experimental-drug rule sought." Lancet 347, no. 9012 (May 1996): 1396. http://dx.doi.org/10.1016/s0140-6736(96)91025-9.

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Dissertations / Theses on the topic "FDM RepRap"

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Kratochvíl, Tomáš. "3D FDM tiskárna reprap a parametry tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232069.

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This master thesis summarizes the current knowledge about non-commercial 3D printing FDM technology. The goal of this thesis is to demonstrate the gained knowledge by building a 3D printer which can partially replicate itself, and to evaluate its technological parameters. The experimental part of this work is focused on the impact of the changes in technological parameters of printing on mechanical properties of printed parts.
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Knapil, Josef. "Stavba a aplikace 3D FDM tiskárny typu deltabot." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232111.

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The thesis describes design and aplication of 3D FDM printer type of delta. The first part describes methods of rapid prototyping. The second part describes 3D printers type of delta. The third part deals with construction and calibration of delta printer. In the fourth part are made suitable modifications to the design of the printer, to improve the quality of printing, which is then applied on a sample product. The final section is devoted to technical and economic evaluation.
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Světlík, David. "Povrchová úprava ABS součástí po 3D FDM tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232057.

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This master thesis deals with the surface treatment of parts made of plastic produced using FDM technology and design of technological device for surface treatment. The thesis describes FDM principles, according to performed experiments in a technological device there are suggested technological conditions for the surface treatment of parts made of ABS plastic. In the end of the thesis, there are calculated costs of the technological device and its operating costs, also mechanical properties, surface roughness and other specifications from before and after the treatment are compared.
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Bouchal, Petr. "Vývoj 3D FDM tiskárny implementace na trh." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241863.

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The result of this thesis is to create an overview of available 3D printing technologies, design a 3D FDM printer, create an instructional manual on the assembling and create a business model of a 3D printing company.
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Prouza, Tomáš. "Návrh duální tiskové hlavy pro FDM 3D tiskárnu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-242851.

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This master thesis is focused on a research in the field of 3D printing technology. During the research a particular technology, being regularly applied by the RepRap printers, is described. Mentioned technology is tested on a Rebel II printer model. The findings are applied to the dual 3D extruder design project. This dual 3D extruder is designed and made in two basic options, where the first option discovers the shortcomings and the second option is modified and tested. In the following step, assessment of applicability, functionality, as well as economic analysis of production of this dual 3D extruder is made.
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Břoušek, Lukáš. "Tepelné úpravy povrchu po 3D FDM tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318156.

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The topic of diploma thesis are surface heat treatments after 3D print by method Fused Deposition Modeling. In the introduction is located recherche of the given issue. Further, we describe the construction and process of the 3D printer construction, on which will be printed samples for experiments in the next part of the thesis. The aim is to determine the behavior and changes of surface structures of heat-affected samples from different materials. Furthermore, the suitability of the used methods and the possibility of their use in practice.
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Čuma, Zdeněk. "3D FDM tiskárna s výměnnou tiskovou hlavou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444263.

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The aim of the work is to design and manufacture a mechanism for setting up and clamping the replaceable head of a 3D FDM printer. The first part of the thesis deals with 3D printing in general, the second part describes the FDM method. Part three is devoted to the selection and construction of a suitable 3D printer, the fourth part to the actual design of the head attachment. In the fifth part, a technical and economic evaluation is carried out.
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Bartoš, Radko. "Návrh temperovaného stolu pro FDM 3D tiskárnu s využitím simulace MKP." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231051.

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Master´s thesis deals with desing of a heated bed for FDM 3D printer using the finite element method. It is briefly described the history of RepRap printers, construction and mechanical parts. Are discussed two methods of heating, heated by PCB boards and using power resistors. Furthermore is work closely focused on power resistors. There are presented methods and procedures which leads to an optimal distribution of heated components on the board of heated bed. In conclusion are presented results of testing which are compared with the simulations in ANSYS.
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Sysel, Karel. "Návrh a zefektivnění parametrů FDM tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230120.

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The essence of the work is to test the possibilities specific type of simple 3D printing device, which has recently been getting more and more into the awareness of professionals and the general public. First, the work is focused on presentation 3D printing technology and current professional equipment, in the second part are experimentally evaluated possibilities of of a simple kind of 3D printers followed by assessment of the applicability of the device in engineering practice.
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Zítka, Lukáš. "Inovace 3D tiskárny typu Rep Rap." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319860.

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The present Master thesis is focused on innovation and verification of the functionality of a 3D RepRap. The theoretical part of the thesis characterizes individual additive technologies. The practical part is focused on the design of the technical modifications of the printer in order to achieve the quality of the printing, while the current 3D printer design is compared with the innovative solution. The practical part tests the setting of print parameters, various materials for 3D printing and necessary finishing operations. The thesis is completed
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Book chapters on the topic "FDM RepRap"

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"Frontmatter." In Condemned to Repeat?, i—vi. Cornell University Press, 2017. http://dx.doi.org/10.7591/9780801468643-fm.

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Santos, Cícero Alysson Cavalcanti dos, and José Orlando Costa Nunes. "Sondagem sobre a necessidade de implementação de uma política de qualidade de vida no trabalho (QVT) na diretoria de pessoal da Polícia Militar do Estado do Rio Grande do Norte." In Gestão de Pessoas na Segurança Pública, 64–75. Editora ZH4, 2021. http://dx.doi.org/10.51360/zh4.20217-8-p64-75.

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A Diretoria de Pessoal (DP) da Polícia Militar do Rio Grande do Norte (PM-RN) corresponde ao setor de Recursos Humanos desta Instituição. Contudo para atender todo o efetivo, necessita de mão de obra qualificada, policiais que além do serviço fim, ou seja, a atividade operacional, têm que atuar em funções administrativas, atendendo àqueles que exercem essa atividade tão peculiar. Muitas vezes, pela especificidade de risco iminente, o militar necessita proporcionar saúde mental a si e seus familiares, como também uma melhor qualidade de vida, com lazer, prática de esportes, confraternizações, dentre outros. Como a DP não possui uma política de Qualidade de Vida no Trabalho – QVT, observa-se insatisfação no efetivo daquela Diretoria, assim como de toda a corporação que depende dos serviços ali prestados. Logo, diante de tal adversidade, este trabalho trouxe a possibilidade de reparar esse impasse, realizando uma análise de viabilidade de implementação de uma política de QVT naquele setor, por meio de uma pesquisa quali-quantativa e bibliográfica, através do uso de um questionário on-line, direcionado aos policiais que ali trabalham, ou seja, 58 PMs, sendo 8 oficiais e 50 praças. Os resultados da pesquisa demonstram que é necessário e viável a implementação dessa política na DP da PM-RN. Conclui-se diante dos fatos, que é de suma importância a implementação da citada política, na qual aqueles militares que compõem esse ambiente de trabalho possam exercer as suas atividades de forma sadia e equilibrada, para que ocorra o íntegro e harmonioso funcionamento das entidades públicas.
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"implications of bioequivalence testing are also described by Patterson and so we do not repeat these here. At the present time average bioequivalence (see Section 7.2) serves as the current international standard for bioequivalence testing using a 2× 2 cross-over design. Alternative designs (e.g., replicate cross-over designs) may be also utilized for drug products to improve power (see Section 7.6). We will consider population and individual bioequivalence testing as these utilize cross-over study designs and were the subject of extensive debate in the 1990s (see Patterson, 2001b, for a summary), but these may not currently be used for access to the marketplace (FDA Guidance, 2002). 7.2 Testing for average bioequivalence The now generally accepted method of testing for ABE is the two-one-sided-tests procedure (TOST) proposed by Schuirmann (1987). It is con-veniently done using a confidence interval calculation. Let µ be the (true) mean values of log(AUC) (or log(Cmax)) when subjects are treated with T and R, respectively. ABE is demonstrated if the 90% two-sided confidence interval for µ falls within the acceptance limits of − ln 1.25 = −0.2231 and + ln 1.25 = 0.2231. These limits are set by the regulator (FDA Guid-ance, 1992, 2001, 2002) and when exponentiated give limits of 0.80 and 1.25. That is, on the natural scale ABE is demonstrated if there is good evidence that: 0.80 ≤ exp(µ ) ≤ 1.25. We note that symmetry of the confidence interval is on the logarithmic scale, not the natural scale. The method gets its name (TOST) because the process of deciding if the 90% confidence interval lies within the acceptance limits is equiva-lent to rejecting both of the following one-sided hypotheses at the 5% significance level: H :µ ≤− ln 1.25 H :µ ≥ ln 1.25. Example 7.1 The derived data given in Tables 7.1 and 7.2are from a pharmacoki-netic study that compared a test drug (T) with a known reference drug (R). The design used was a 2×2 cross-over with 24 healthy volunteers in the RT sequence group and 25 in the TR sequence group. Each volunteer should have provided both an AUC and Cmax value. However, as can." In Design and Analysis of Cross-Over Trials, 352. Chapman and Hall/CRC, 2003. http://dx.doi.org/10.1201/9781420036091-7.

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"population of potential patients, but be such that they produce different effects when a patient is switched from formulation T to formulation R or vice-versa. In other words there is a significant subject-by-formulation interaction. To show that this is not the case T and R have to be shown to be IBE, i.e., individually bioequivalent. The measure of IBE that has been suggested by the regulators is an aggregate measure involving the means and variances of T and R and the subject-by-formulation inter-action. We will describe this measure in Section 7.4. In simple terms PBE can be considered as a measure that permits patients who have not yet been treated with T or R to be safely prescribed either. IBE, on the other hand, is a measure which permits a patient who is cur-rently being treated with R to be safely switched to T (FDA Guid-ance, 1997, 1999a,b, 2000, 2001). It is worth noting that if T is IBE to R it does not imply that R is IBE to T. The same can be said for PBE. An important practical implication of testing for IBE is that the 2×2 cross-over trial is no longer adequate. As will be seen, the volunteers in the study will have to receive at least one repeat dose of R or T. In other words, three-or four-period designs with sequences such as [RTR,TRT] and [RTRT,TRTR], respectively, must be used. The measures of ABE, PBE and IBE that will be described in Sec-tions 7.2, 7.5 and 7.4 are those suggested by the regulators. Dragalin and Fedorov (1999) and Dragalin et al. (2002) have pointed out some drawbacks of these measures and suggested alternatives which have more attractive properties. We will consider these alternatives in Section 7.7. All the analyzes considered in Sections 7.2 to 7.4 are based on sum-mary measures (AUC and Cmax) obtained from the concentration-time profiles. If testing for bioequivalence is all that is of interest, then these measures are adequate and have been extensively used in practice. How-ever, there is often a need to obtain an understanding of the absorb-tion and elimination processes to which the drug is exposed once it has entered the body, e.g., when bioequivalence is not demonstrated. This can be done by fitting compartmental models to the drug con-centrations obtained from each volunteer. These models not only pro-vide insight into the mechanisms of action of the drugs, but can also be used to calculate the AUC and Cmax values. In Section 7.8 we de-scribe how such models can be fitted using the methods proposed by Lindsey et al. (2000a). The history of bioequivalence testing dates back to the late 1960s and early 1970s. Two excellent review articles written by Patterson (2001a, 2001b) give a more detailed description of the history, as well as a more extensive discussion of the points raised in this section. The regulatory." In Design and Analysis of Cross-Over Trials, 351. Chapman and Hall/CRC, 2003. http://dx.doi.org/10.1201/9781420036091-6.

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Conference papers on the topic "FDM RepRap"

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Kung, Chieh, Hsu-Chiang Kuan, and Chen-Feng Kuan. "Evaluation of tensile strength of 3D printed objects with FDM process on RepRap platform." In 2018 1st IEEE International Conference on Knowledge Innovation and Invention (ICKII). IEEE, 2018. http://dx.doi.org/10.1109/ickii.2018.8569166.

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M. da Silva, Amanda, Ana Paula G. Marchesan, Milena T. Zonin, Adriano C. Marchesan, Klaus T. Martin, and Adriano P. de Morais. "Restabelecimento de Serviço: uma Revisão Crítica Quanto a Aplicação em Sistemas de Distribuição Brasileiros." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1352.

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Este trabalho apresenta uma revisão crítica da literatura referente ao tema de restabelecimento de serviço, analisando a aplicabilidade das metodologias propostas em sistemas de distribuição brasileiros. O artigo destaca a relevância do tema, descreve o problema de reestabelecimento e apresenta a crítica com base nos seguintes tópicos: nível de automação da rede, tempos de atuação e reparo, sistemas de proteção, inserção de geração distribuída e sistemas teste. Por fim, são apresentadas algumas sugestões para trabalhos futuros.
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W. Leal, Bernardo, and Roberto Z. Freire. "Detecção de expulsão em processos de soldagem a ponto por resistência: uma análise comparativa envolvendo métodos baseados em aprendizado de máquina." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1749.

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A utilização de manutenção preditiva na indústria auxilia na diminuição de custos de produção, pois reduz imprevistos ao reparar equipamentos durante períodos ociosos de funcionamento. Diversos métodos de aprendizado de máquina têm sido empregados para detecção de falhas em processos de soldagem. Neste estudo, os algoritmos Árvores de Decisão, k-ésimo Vizinho mais Próximo, Naive Bayes, Máquina de Vetores de Suporte e Boosting Adaptativo foram avaliados levando em conta a detecção de falhas no processo de soldagem a ponto por resistência na indústria automotiva. Neste sentido, o objetivo deste trabalho foi analisar o desempenho desses algoritmos na detecção de expulsão em soldas utilizando dados, não rotulados, provenientes de um controlador proprietário. Os resultados obtidos apresentam a acurácia de cada modelo levando em conta o conjunto de dados selecionado, indicando que técnicas de aprendizado de máquina podem ser utilizadas para a detecção de falhas no processo de soldagem. Por fim,o método k-ésimo Vizinho mais Próximo se mostrou como o método mais preciso avaliado neste estudo.
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C. Júnior, Misael, and Márcio E. Delamaro. "Automatização de oráculos de teste para imagens médicas de modelos tridimensionais." In Anais Estendidos do Simpósio Brasileiro de Computação Aplicada à Saúde. Sociedade Brasileira de Computação (SBC), 2019. http://dx.doi.org/10.5753/sbcas.2019.6284.

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Oráculos de teste determinam se uma execução de um SUT (do inglês, System Under Test) está correta ou não. Entretanto, dependendo da natureza dos dados produzidos pelo sistema, o SUT é conhecido como sistema de saı́da complexa, tornando a automatização dos oráculos um desafio. Sistemas na área de sáude, em particular, que analisam imagens tridimensionais, exemplificam um tipo de sistema de saı́da complexa. Um dos desafios associados a sistemas que analisam imagens tridimensionais é saber se a saı́da produzida está cor- reta ou não. O fato de se tratar de um sistema de saı́da complexa torna essa tarefa mais difı́cil, fazendo com que estratégias ad-hoc e manuais sejam aplica- das. Nesse trabalho de mestrado procurou-se contribuir por meio da definição de oráculos de teste baseados na extração de caracterı́sticas das saı́das do sis- tema. A abordagem proposta foi aplicada especificamente em sistemas cujas saı́das consistem em imagens sintéticas tridimensionais de vasos sanguı́neos. Para tanto, é explorado o framework O-FIm/CO (do inglês, Oracle for Images and Complex Outputs), que utiliza conceitos de CBIR (do inglês, Content-Based Image Retrieval) como uma forma de automatizar oráculos de teste. Além de adaptações e extensões do framework, desenvolveram-se plug-ins, que repre- sentam extratores de caracterı́sticas para imagens sintéticas tridimensionais de vasos sanguı́neos. Dois estudos experimentais foram conduzidos objetivando avaliar a eficácia e a precisão dos oráculos de teste baseados em caracterı́sticas na avaliação desse tipo de imagem. Além disso, realizou-se um estudo experi- mental comparando oráculos automatizados e oráculos humanos. Os resultados evidenciam a eficácia da abordagem como uma estratégia promissora para au- tomatizar atividades de teste, contribuindo para a redução de tempo e esforços gerados por abordagens manuais durante a avaliação da qualidade de sistemas geradores de imagens médicas tridimensionais.
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Albuquerque, Enzo Aldo Cunha, Luisa Resende Kanno, Thaynara Lima de Oliveira, and Leonardo da Silveira Pirillo Inojosa. "Plano de execução BIM para sistema de manutenção de edificações." In ENCONTRO NACIONAL SOBRE O ENSINO DE BIM. Antac, 2021. http://dx.doi.org/10.46421/enebim.v3i00.294.

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A construção civil vem se desenvolvendo junto à revolução tecnológica e assim necessitando de uma integração com as tecnologias digitais. Nesse contexto a metodologia Building Information Modeling (BIM) permite ter informações sobre todo o ciclo de vida da construção, desde a fase de concepção do projeto até a fase de manutenção, sendo este o ponto focal da pesquisa. O uso do BIM será obrigatório no gerenciamento e na manutenção do empreendimento após a sua construção, cujos projetos de arquitetura e engenharia e cujas obras tenham sido desenvolvidos ou executados com aplicação do BIM a partir de 1° de janeiro de 2028 de acordo com o decreto n° 10.306 (BRASIL, 2020). Para a aplicação da metodologia é necessário um plano de execução BIM a fim de planejar os processos de elaboração de um modelo BIM, de monitoramento da edificação e de gerenciamento de ativos. A partir de um plano de execução BIM bem definido é possível: criar modelos virtuais tridimensionais da edificação; propor uma base de dados padrão para receber informações relativas aos sistemas e elementos construtivos com documentação, especificações técnicas e histórico de manutenções; sistematizar informações relativas às manifestações patológicas com descrição de causas, processo de degradação, método de recuperação/reparo ou substituição. Neste aspecto, foi elaborado um plano de execução e testado parte deste em um estudo de caso do Bloco C da Faculdade de Tecnologia (FT) da Universidade de Brasília (UnB). O Bloco C abriga o Departamento de Engenharia Civil e Ambiental, com salas de aula, centros acadêmicos, empresa júnior e projetos de extensão. Assim, este bloco tem sido um local de intensa atividade acadêmica, social e profissional. Este trabalho pretende apresentar um plano de execução BIM e parte da sua aplicação em uma edificação existente visando o melhor gerenciamento da mesma, como também, servir de conteúdo teórico-prático da metodologia BIM sobre aplicação nas fases de operação e manutenção da edificação. A metodologia utilizada foi baseada no BIM Project Execution Planning Guide de Messner et al. (2019). A partir das metas do plano, são definidos os potenciais usos BIM e ,de acordo com estes, são propostos fluxogramas de processo de trabalho, os quais incluem as etapas do processo, a interação entre equipes e os entregáveis. Desta forma, neste estudo de caso, foi necessário realizar o as-built do Bloco C complementando com as condições atuais e desenvolver um programa de manutenção. As ferramentas utilitárias da tecnologia BIM selecionados foram: modelagem de condições existentes, modelagem de registros, análise do sistema de construção, análise estrutural, análise de outras engenharias, gestão de ativos, gerenciamento de espaços/rastreamento e planejamento de manutenção; usos estes definidos por Messner et al. (2019). Para a execução destes processos são necessários softwares BIM, como o Revit Autodesk®, para modelagem, Robot Autodesk® para análise estrutural. No primeiro momento, procurou-se utilizar o QiBuilder AltoQi® para as instalações hidráulicas, no entanto, por este não possibilitar a inserção de informações individuais em cada elemento foi utilizado o Revit. As competências necessárias predominantes foram a gestão das informações e manipulação dos softwares visando a interoperabilidade e a obtenção dos resultados estipulados. Para realizar a modelagem tridimensional foi primeiramente solicitada a documentação existente na Prefeitura do Campus no Centro de Planejamento Oscar Niemeyer, órgão responsável pelo planejamento físico e ambiental, patrimônio histórico e projetos de arquitetura do Campus Darcy Ribeiro da UnB. Porém, houve demora para conseguir o acesso à documentação, que estava incompleta, além de estar desatualizada, fato que demonstra a dificuldade enfrentada pelos gestores das edificações, o que reforça a necessidade de levantamentos e análises in loco. Com parte da documentação em mãos foi realizado o levantamento de forma presencial, usando de registros fotográficos e trena manual e a laser para modelagem das condições atuais da edificação. Foram realizadas duas visitas ao Bloco C, a primeira, antes do início da modelagem e uma posterior para obter informações mais detalhadas para a elaboração do modelo BIM. Foi definida uma nomenclatura padrão para nomear arquivos e pastas, baseada nos manuais de práticas em BIM (BLUMENSCHEIN et al., 2019 & 2020); a plataforma de hospedagem utilizada foi o Dropbox. As modelagens das disciplinas de arquitetura, estrutura e instalações hidráulicas foram realizadas no software Revit Autodesk® na versão estudantil de 2021. Através do plano de execução BIM traçado obteve-se fluxogramas para coordenar os processos. Estes foram divididos em nível 1 e nível 2, sendo o nível 1 contendo um fluxograma do processo de planejamento de execução BIM com os usos BIM previstos e os entregáveis em cada uso. Dentro do nível 2, cada uso BIM foi explorado com os processos necessários para a execução – da modelagem de condições existentes e de registro, análise do sistema de construção, planejamento de manutenção, gestão de ativos e gerenciamento de espaços – evidenciando as informações de referência e como pode ser feito o intercâmbio de informações. Este plano foi aplicado no estudo de caso, resultando em um modelo de arquitetura, estrutura e instalações hidráulicas com a possibilidade de visualização da edificação em três dimensões permitindo uma identificação e compreensão mais rápida do edifício, além de possuir as informações associados aos elementos. Foram feitas análises de deslocamento do sistema estrutural submetido ao peso próprio. As instalações foram estimadas considerando a posição das peças de utilização e os diâmetros baseados nas normas atuais. O estado de conservação dos componentes foi baseado na metodologia “Grau de Deterioração da Estrutura” (GDE/UnB) (FONSECA, 2007), a qual faz uma análise dos níveis de deterioração na estrutura e informa propostas de intervenção. Verificou-se que as tabelas do Revit são uma boa forma de compilar as informações dos ativos de forma que estejam sempre vinculadas ao modelo BIM, o qual visa representar as condições atuais da edificação. Apresentação no YouTube: https://youtu.be/e0eBTM6Flko
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