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SSRN 2023年

作者： Muñoz Chávez, Jairo José de Souza Lira, Margareth Nascimento Bestard, Guillermo Alvarez da Cruz Payão Filho, João Alfaro, Sadek Crisostomo Absi Post-Graduation Program in Mechatronics Engineering Department of Mechanical Engineering University of Brasilia CEP 70.910-900 Brazil Federal University of Rio de Janeiro Department of Metallurgical and Materials Engineering National Laboratory of Welding Technology Rio de Janeiro RJ Ilha do FundãoCEP 21941-972 Brazil

This study aims to develop a methodology for obtaining and validating surface parameters using the pulsed GMAW process, capable of producing a weld with appropriate geometric properties as a response. For this purpose, profiling was used as a capture tool together with stability analysis algorithms and metallic transfer criteria. The Fast Fourier Transform was used to analyze the intensity of electric current and voltage oscillogram for the delimitation of the most efficient pulse, detachment characteristics, and drop frequency in each analyzed parameter. In parallel, mathematical modelling of the overlapping of welding beads and volume filling simulation was carried out to obtain a repair methodology of satisfactory quality. Such strategies defined a working window with a voltage between 22 V and 28 V and an intensity of electric current between 190 A and 220 A. For the analyzed material, the best response values were at the base intensity of electric current of 80 A, base time of 1.47 ms, drop separator intensity of electric current of 110 A, drop separator time of 0.5 ms, the peak intensity of electric current of 375 A and peak time of 2.2 ms, corresponding to a working frequency of 240 Hz. With this work methodology, using signal analysis and profiling filming, it is possible to adapt the choice of process parameters to any material with energy and cost savings. These techniques are highly efficient and low-cost. In addition, the GMAW-P transfer mode allows quality work with the intensity of electric current values lower than conventional GMAW. © 2023, The Authors. All rights reserved.

关键词： Drops

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Influence of Phase Transformation Coefficient on Thermomechanical Modeling of Laser Powder Bed Fusion for Maraging 300 Steel

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SSRN 2024年

作者： dos Santos Silva, Bruno Caetano de Figueiredo Soares, Lucas Coelho, Rodrigo Santiago Sitek, Wojciech Król, Mariusz Batalha, Gilmar Ferreira University Center SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata BA Salvador41650-010 Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã SP Sao Paulo05508-030 Brazil University Center SENAI CIMATEC Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata Salvador-BA41650-010 Brazil Department of Engineering Materials and Biomaterials Faculty of Mechanical Engineering Silesian University of Technology 18A Konarskiego St. Gliwice44-100 Poland

Manufacturing maraging steel components using laser-based powder bed fusion (LPBF) presents an attractive proposition for industries due to the material's combination of mechanical properties such as hardness, wear resistance, and toughness, and the capability to produce parts with complex geometries and high precision. Despite these advantages, the LPBF process induces defects such as distortion and residual stress associated with the complex thermal cycles, compromising final part quality. Numerical simulations have been developed to predict these defects. However, LPBF simulations remain challenging due to the complexity of the process and the substantial computational resources required. For maraging steel, for example, the occurrence of phase transformation promotes compressive stress that interferes in results and makes simulations inaccurate. This research aims to simulate a geometry with a circular inner channel and investigate distortion, volume fraction of martensite and equivalent stress results. Modeling was performed by varying phase transformation rate parameters to assess the impact of transformations on simulation outcomes. Results showed minimal impact of these parameters on distortions and equivalent stress. Equivalent stress results were compared with literature findings, while distortion results were validated against experimental data to validate the accuracy of the model. © 2024, The Authors. All rights reserved.

关键词： Phase transitions

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Investigation of thermal parameters in numerical modeling of the laser powder bed fusion process for maraging 300 steel

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Materials Science and Engineering: B 2025年 321卷

作者： Bruno Caetano dos Santos Silva Lucas de Figueiredo Soares Luã Fonseca Seixas J.P. Oliveira Jiajia Shen Rodrigo Santiago Coelho Gilmar Ferreira Batalha SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã Sao Paulo 05508-030 SP Brazil SENAI CIMATEC University Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil CENIMAT | i3N Department of Materials Science School of Science and Technology NOVA University Lisbon Caparica Portugal

The development of numerical simulations for metal additive manufacturing (AM) processes to predict distortion and residual stress is considered a strategic tool for supporting the industrialization of AM. However, the complexity of these analyses, due to the intricacies of thermal cycles, demands substantial computational resources and a deep understanding of the key process variables to achieve accurate models. This study aims to evaluate the influence of thermal parameters on the results of thermomechanical simulations using the Inherent Strain Method (ISM). Specifically, the analysis investigates the effects of estimated peak temperatures on thermal analyses, distortion, equivalent stress, and microstructure volume fraction in maraging 300 steel (MS300) parts simulated via finite elements. The results indicate that varying the peak temperature of the models causes a linear change in the thermal simulation output, referred to as the exposed energy fraction (EEF) in the Simufact Additive software, which determines the thermal history of the process in fabricated geometry. However, the distortion behavior—by the mechanical analyses that used the EEF as input—deviated from this linearity across specific regions, emphasizing the need for localized accuracy assessment within complex geometries. Equivalent stress decreased with lower peak temperatures, highlighting a correlation between these factors, while the microstructure volume fraction remained unchanged across different peak temperatures. The simulation results were validated by comparing the simulated measurements with experimental data of the same geometry manufactured via laser powder bed fusion (LPBF). Displacement in the simulation was assessed by comparing the diameters of the front and back faces, as well as through surface deviation analysis, which highlighted variations between the scanned experimental geometry and the simulated part. Additionally, the microstructure of the experimental part was examine

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Balancing a system using variable speed drivers

Balancing a system using variable speed drivers

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11th IFAC Workshop on Intelligent Manufacturing Systems, IMS 2013

作者： Natalia, Oliveira L. Cícero, De Paula A.B. Herman, Lepikson A. Post-Graduation Program in Mechatronics Federal University of Bahia Salvador Brazil Center of Technological Qualification in Industrial Automation Federal University of Bahia Salvador Brazil Mechanical Engineering Department Federal University of Bahia Salvador Brazil

ISBN: (纸本)9783902823335

Unbalanced mechanical systems are always of great concern to engineers because of, the implications on the reliability of the systems. This paper presents two approaches to handling the problem in mechanical systems equipped with electrical motors driven by variable speed drivers. The two methods are able to verify the imbalance of the system based on the cyclic load factor (CLF) and on the discrete Fourier transform (DFT), both using the torque signal obtained from the drive. Algorithms were developed to obtain the necessary parameters from the drive and then converted into ladder programs able to be embedded in the drivers so that real time balancing control can be achieved. Experimental results demonstrate the possibility of assisting the balancing of mechanical systems based on the developed algorithms. Among the advantages of maintaining a balanced system using the present approach is preventing equipment wear, increasing the useful life and reducing maintenance costs. © 2013 IFAC.

关键词： Discrete Fourier transforms

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Balancing a system using variable speed drivers

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IFAC Proceedings Volumes 2013年第7期46卷 122-127页

作者： Oliveira L. Natalia de Paula A.B. Cícero Lepikson A. Herman Post-graduation program in Mechatronics Federal University of Bahia Salvador Brazil (Tel: 71-3283-9471) Center of technological qualification in industrial automation Federal University of Bahia Salvador Brazil (Tel:71-3283-9755) Mechanical Engineering Department Federal University of Bahia Salvador Brazil

关键词： Balancing system Cyclic load factor Discrete Fourier transform Variable speed drivers

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Engineering components for flexible and interoperable real-time distributed supervision and control systems

Engineering components for flexible and interoperable real-t...

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12th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2007

作者： Andrade, Sandro Santos De Macêdo, Raimundo José Araújo Post-Graduation Program on Mechatronics Federal University of Bahia Campus de Ondina 40170-110 Salvador-BA Brazil

ISBN: (纸本)1424408261

The new requirements of modern real-time distributed supervision and control systems such as more flexibility, interoperability, and cost savings, have motivated the use of software-intensive solutions both in academia and industry. Following this trend we have presented, in a previous publication, the design rationale and implementation issues of a flexible and reusable software platform (ARCOS) that relies on the CORBA Component Model (CCM/CIAO), the DAIS (Data Acquisition from Industrial Systems) standard, and framework technologies. This paper builds on this previous publication by presenting a new assembly tool that allows for the visual componentbased implementation of ARCOS-based systems and the automatic generation of the related CCM/CIAO/ARCOS artifacts. To demonstrate the power of such a tool, two example applications are presented. © 2007 IEEE.

关键词： Control systems

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Engineering components for flexible and interoperable real-time distributed supervision and control systems

Engineering components for flexible and interoperable real-t...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Sandro Santos Andrade Raimundo Jose de Araujo Macedo Distributed Systems Laboratory (LaSiD) Post-Graduation Program on Mechatronics Federal University of Bahia Salvador Brazil

The new requirements of modern real-time distributed supervision and control systems such as more flexibility, interoperability, and cost savings, have motivated the use of software-intensive solutions both in academia and industry. Following this trend we have presented, in a previous publication, the design rationale and implementation issues of a flexible and reusable software platform (ARCOS) that relies on the CORBA component model (CCM/CIAO), the DAIS (data acquisition from industrial systems) standard, and framework technologies. This paper builds on this previous publication by presenting a new assembly tool that allows for the visual component-based implementation of ARCOS-based systems and the automatic generation of the related CCM/CIAO/ARCOS artifacts. To demonstrate the power of such a tool, two example applications are presented.

关键词： Real time systems Distributed control Control systems Computer industry Costs Electrical equipment industry Industrial control Software reusability Data acquisition Software standards

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