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|S.No.||Article Title & Authors (Volume 16, Issue 4, August - 2023)||Page Nos.||Status|
|1.||Computational Modeling and Simulation of Gas Turbulence Phenomena in Solution Blow Spinning Process for Ceramic Nanofibers
Camila Ariana Becker Pereira, Maria Dennise Medeiros Macedo, Romualdo Rodrigues Menezes, Severino Rodrigues de Farias Neto
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 129-143, August 2023.
The high-speed air profile expelled from a solution blow spinning nozzle was investigated using computational fluid dynamics and a k-e turbulence model. A convergent nozzle comprised of a polymer solution channel, an air inlet and an air chamber were computationally generated to better understand the behavior of the fluids inside the matrix. Three meshes were proposed to study the influence of air velocity, pressure, and turbulent kinetic energy. The variation in gas outlet velocity reveals a lack of uniformity in the profile, indicating that the tube length is insufficient to achieve uniformity, which may significantly impact fiber morphology. Under different pressures (40 and 30 psi), there was a reduction in the average gas velocity inside and at the tube outlet. However, uniformity has not yet been achieved, potentially affecting fiber continuity.
|2.||An Analysis of Residual Stresses in Pipeline Steel: A Comparative Study using X-Ray Diffraction and Ultrasonic Techniques
Bruna Machado, Gabriela Ribeiro Pereira, Mauricio Motta and Maria Cindra Fonseca
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 144-154, August 2023.
The occurrence of residual stresses is inherent in all manufacturing processes, and under external loading, residual and applied stresses can linearly sum even in the elastic regime, leading to unexpected component failure. Therefore, offering alternative techniques that facilitate the qualification and quantification of residual stresses is a task of great significance. In this context, this study aims to provide a comparative study of residual stresses in samples of API X80 steel, using two non-destructive techniques: X-ray diffraction employing the sin²? method and ultrasonic testing utilizing the Rayleigh wave. The results demonstrate that the time of flight wave was consistent with the residual stresses measured through X-ray diffraction. The ultrasonic signals exhibited sensitivity to the nature and magnitude of the residual stresses. The comparative analysis provides valuable insights for the selection and application of non-destructive techniques in assessing residual stresses, contributing to the enhanced safety and performance of structures and components.
|3.||Effects of Functionalized Nanosilica with Low Aminosilane Content on the Mechanical Properties and Microstructure of Cementitious Materials
Andreia de Paula, Yuri Sotero Bomfim Fraga, Joao Henrique da Silva Rego, Maria Jose de Souza Serafim
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 155-169, August 2023.
To investigate the effect of functionalizing NS with low levels of APTES on the mechanical and microstructural properties of cementitious materials, four pastes were examined: one produced with Portland cement (REF); another with 1% substitution of cement with nanosilica (NS); another with 1% substitution of cement with APTES-functionalized nanosilica using 2mL of APTES (NSFA2); and one with 1% substitution of cement with APTES-functionalized nanosilica using 4mL of APTES (NSFA4). Compressive strength at 1, 3, 7, and 28 days of hydration, as well as porosity measured by mercury intrusion porosimetry (MIP), were evaluated in the cementitious mixtures. The compressive strength of the NSFs was higher than that of REF and NS. NSFA4 achieved a 28% higher strength compared to REF and 17% higher strength compared to NS at 28 days. MIP showed that the additions of NS and NSF resulted in a decrease in total porosity compared to the reference mortar.
|4.||Comparative Analysis Between the Results of Seismic Investigation and SPT Test of a Tropical Soil Profile in the Brasília Region - DF
Gabriel de S. Meira, Rafael C. Silva, Marcelo P. Rocha, Thiago L. Mendes, Douglas C. Muniz and Genesson D. Castro
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 170-187, August 2023.
In geotechnical engineering constructions, technical regulations prescribe a minimum number of drilling tests to allow the definition of the geotechnical profile of the site. However, even meeting this prerogative, obtaining data through this type of investigation is punctual, which can lead to errors in geological-geotechnical interpretations. In this context, this work aims to evaluate the use of seismic refraction and MASW methods as complementary tests to the SPT geotechnical investigation method, to validate the use of these methodologies to interpret a tropical soil profile. The seismic and geotechnical investigations were carried out in a vertical excavation located in the northwest region of the city of Brasília – DF, Brazil. The results showed a good correlation between the seismic methods and the SPT regarding the identification of soil layers present at the site. For both seismic methods, it was possible to verify an increase in the velocities of the VS and VP waves with increasing depth, which allowed the evaluation of the interfaces between the soil layers in the first 15 meters. It can also be verified that both methodologies have the potential to identify layers of porous soils with collapsible behaviour.
|5.||Modelling of a Bayesian System for Accurate Estimation of Body Temperature from Thermal Images
Edward Netzer and Peterson Belan
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 188-199, August 2023.
This study presents an innovative methodology for accurately measuring body temperature using market-available thermal cameras and Bayesian networks. It was observed that the precision of temperature measurements from thermal cameras can be significantly improved through this approach. The study started with the acquisition of 460 thermal images, which were processed and analysed using a Bayesian networks algorithm implemented in MATLAB. The errors in directly measuring temperature from the thermal camera were minimized with the use of the proposed methodology, resulting in a significant improvement in accuracy. Although the results are promising, improvements are needed for applications that require more precise temperature measurements, such as health monitoring. The study concludes that the application of Bayesian networks for thermal image analysis presents a potential solution for accurately measuring body temperature and represents an important direction for future research in this area.
|6.||Optimization of a Wastewater Treatment System Composed by Electrochemical Reactor and Dissolved Air Flotation
Ruan Bocchi, Eduardo Eyng, Juliana Bortoli Rodrigues Mees, Fábio Orssatto, Ilton Jose Baraldi, Laercio Mantovani Frare
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 200-214, August 2023.
Using combined technologies to treat effluents can be an attractive option to achieve treatment efficiency associated with resource savings. Thus, this work aimed to evaluate the performance of electrocoagulation in a cylindrical batch reactor followed by dissolved air flotation in effluent treatment from a slaughterhouse. Through two Central Composite Rotational Design (CCRD), it was possible to evaluate the effects of electrolysis time and electric current density for the electrocoagulation stage and the saturation pressure and hydraulic retention time for the dissolved air flotation stage. The results obtained from the tests carried out indicate that the proposed treatment system was promising for removing COD (81.13%), turbidity (96.84%), and color (95.48%). With the association of the two technologies, it was possible to operate in milder conditions, which provided a low energy consumption for the electrochemical treatment stage. The optimized conditions for the electrocoagulation step provided energy consumption of 333.76 ± 0.515 Wh.m-3, a low and attractive value.
|7.||Fuzzy Control Strategies Applied to an Air Levitation System
Adelar Baccon de Araujo, Carlos Alexandre de Souza Bispo, Ricardo Breganon, Uiliam Nelson Lendzion Tomaz Alves, Luis Fabiano Barone Martins, Fernando Sabino Fonteque Ribeiro and Joao Paulo Lima Silva de Almeida
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 215-228, August 2023.
Pneumatic systems are known for their nonlinear characteristics and susceptibility to disturbances from turbulences in airflow, which make them interesting for validating control strategies in academic studies. This work presents the development and control of a didactic system for vertically positioning a ball via an airflow, a device known as Air Levitation system. The main constructive aspects of the considered low-cost Air Levitation system are described in this paper. Furthermore, three fuzzy control strategies (PD-Fuzzy, Incremental PD-Fuzzy, and PD-Fuzzy+I) were implemented in this system for comparative purposes. The controllers were implemented through the Matlab/Simulink® software along with an Arduino UNO board. Finally, the experimental results of the fuzzy control strategies are presented, and their main differences are highlighted.
|8.||Alkali-Activation of Recycled Concrete Waste
Edna Paula da Costa Reis, Guilherme Jorge Brigolini Silva and Jose Carlos Borba Jr
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 229-240, August 2023.
Civil construction is one of the sectors that most cause environmental impacts. Given this scenario, it is extremely important to develop new technologies that contribute to making civil construction a sector with less polluting potential. Stations the exploratory-research presentation of an alkali-activated material (AAM) with cementitious properties using the study of recycled concrete as a precursor. After concrete preparation by grinding and sieving, the material precursor was prepared by X-ray fluorescence, X-ray diffraction, laser diffraction granulometry and SEM-SE. Five different mixes in the production of different silicas and hydroxides of 3% and 9% of contents of 0%, 2% and 8% content. After curing 10°C as masses, they were from 0 to 7 days of curing tests X-ray diffraction and thermal resistance through tests. The highest bond strength was 14MPa. In the XRD assay there was no formation of new crystalline phases. The SEM/EDS analysis suggests a formation of a C-A-S-H gel. The material characterization assays for the possibility of using AAM.
|9.||Development of Educational Material using the Experiments Conducted by Students in Practical Physics Classes in Engineering Courses at the State University of Minas Gerais - Divinopolis Campus
Alessandro Leonardo da Silva, Marcelo Robert Fonseca Gontijo, Icaro Viterbre Debique Sousa, Heron Viterbre Debique Sousa, Thais Prado Vasconcelos, Ivana Prado de Vasconcelos, Artur Saturnino Rodrigues, Rodrigo Silva Fonseca, Laila Eduarda Oliveira, Jaqueline Aparecida Melo
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 241-246, August 2023.
Many authors address in their works the difficulty of high school students in absorbing certain concepts applied in the teaching of Physics only theoretically. One of the strategies incorporated in teaching projects in recent decades to minimize this problem was the implementation of experimental classes for the study of natural sciences in schools. Faced with this reality, the present project aims to facilitate the execution of some practical classes, so that quality teaching material is obtained and that can later be shared with teachers from our state high school network.
|10.||Structural Design of a Steel Warehouse Composed of Portal Frames Formed by Rolled Steel Profiles
Joao Victor Cordeiro Barros, Douglas Mateus de Lima, and Mateus Narcizo de Almeida Nunes
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 247-261, August 2023.
In Brazil, the use of steel as a structural element in the most diverse segments of civil construction is increasingly frequent, especially in the industrial area, where there is a significant use of this material, particularly in the construction of warehouses. Nevertheless, when considering the manufacture of warehouses with portal frames structured in laminated steel profiles, it is noticeable that their adoption is relatively limited, while in other countries, where there is a greater consolidation of the steel culture, the use of this solution is widely spread, mainly due to its speed and practicality in the execution of projects. Therefore, the objective of the present work is to develop the structural design of a warehouse composed of laminated frames, to be implemented in the municipality of Belo Jardim, in the Agreste region of Pernambuco, in order to provide a wider range of solutions for this segment in the region. To this end, the structural elements were initially dimensioned, in unit form, through manual calculations, and subsequently their modeling and structural analysis were performed using the SCIA Engineer 22.0 software (student version), according to the current standards. Finally, the results of the structural design and the analysis of the quantity required for the construction project are presented.
|11.||Optimization of Cutting Process Parameters in Nickel-Based Alloy Nimonic 80A using Multi-Objective Function and Taguchi Analysis
Ricardo Batista Penteado, Messias Borges Silva, Luis Fernando Magnanini de Almeida, Fernando Costa Malheiros, Mara Rubia da Silva Miranda
International Journal of Advances in Engineering & Technology (IJAET), Volume 16 Issue 4, pp. 262-273, August 2023.
Nickel alloys are characterized by presenting a high cost in manufacturing of machined parts because of these material's characteristics makes it difficult to machine. Based on the complexity and in the widespread applications, the nickel-alloy machining needs to be judiciously investigated. The objective of this work is the study of the machining by external cylindrical turning on a CNC Machining, using a nickel-based alloy Nimonic 80A to optimize the variable response Roughness (Ra) and Length of Cutting (Lc). The proposed analysis to find the best values of Ra and Lc using multi objective functions optimized with Meta-Heuristic techniques (Simulated Annealing and Genetic Algorithm) and using two different methods of agglutination (Desirability and Average Percentage Distance). The design of the experiment was a Taguchi Orthogonal Array L8, operating in two levels. The machining experiments were accomplished considering the machining parameters: cutting speed (75 and 90 m.min-1), cutting depth (0,8 and 1,6 mm), feed rate (0,12 and 0,18 mm.rev-1), kind of tool (TNMG160404R-UX TP2500 and TNMG160404R-UX CP250) and environment (minimum quantity of fluid (MQF) and flood).