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Selected Papers from OPROTEH 2023: 18th International Conference of Constructive...
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Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Machine Design and Theory".

Deadline for manuscript submissions: closed (31 July 2024) | Viewed by 9704

Special Issue Editors

Dr. Mirela Panainte-Lehăduș

E-Mail Website
Guest Editor
Department of Environmental Engineering and Mechanical Engineering, Faculty of Engineering, Vasile Alecsandri University of Bacau, 157 Calea Marasesti, 600115 Bacau, Romania
Interests: environmental engineering; processes; technology; mechanical engineering
Special Issues, Collections and Topics in MDPI journals
Dr. Narcis Barsan

E-Mail Website
Guest Editor
Faculty of Engineering, Vasile Alecsandri University of Bacau, 157 Calea Marasesti, 600115 Bacau, Romania
Interests: water; wastewater; sludge; environmental engineering; processes; technology; mechanical engineering
Dr. Florin Nedeff

E-Mail Website
Guest Editor
Department of Environmental Engineering, Mechanical Engineering and Agritourism, Faculty of Engineering, "Vasile Alecsandri" University of Bacău, 600115 Bacău, Romania
Interests: acoustic materials; drone development; environmental engineering; sustainable development
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

New scientific trends and innovations in engineering innovations must be disseminated at an international level in order to contribute to the development of society.

This Special Issue discusses the latest trends in engineering research with a focus on the most important domains from engineering sciences. The 18th International Conference of Constructive Design and Technological Optimization in Machine Building—OPROTEH 2023, 11–13 MAY 2023—is an event organized by the Faculty of Engineering from Vasile Alecsandri University of Bacau, Romania.

The International Conference OPROTEH is the most important scientific event organized by our University. This international event is a worldwide gathering of academicians, scientists, researchers, engineers, professionals, industry experts, decision-makers, and students to share and discuss the latest advancements in the engineering fields.

Topics of interest to this Special Issue include, but are not limited to, the following:

  1. Optimization of manufacturing processes and systems and computer-aided design and manufacturing.
  2. Optimization of technologies and equipment from process industries.
  3. Optimization in environmental engineering and environmental protection.
  4. Mechatronics and robotics.
  5. Computer science and industrial power engineering.

Dr. Mirela Panainte-Lehăduș
Dr. Narcis Barsan
Dr. Florin Nedeff
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

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20 pages, 3921 KiB  
Article
Design of Mixing Device Shafts Based on a Proposed Calculation Method Supported by Finite Element Method Analysis
by Luminita Bibire, Alexandra-Dana Chitimus and Vlad Ciubotariu
Machines 2024, 12(7), 479; https://doi.org/10.3390/machines12070479 - 16 Jul 2024
Viewed by 960
Abstract
The elasticity of bearings as well as their clearance have an essential influence on the total arrow and, therefore, on their own pulsation. In most of the literature, this elasticity is neglected in the calculation of shaft deflections. In some work, the elasticity [...] Read more.
The elasticity of bearings as well as their clearance have an essential influence on the total arrow and, therefore, on their own pulsation. In most of the literature, this elasticity is neglected in the calculation of shaft deflections. In some work, the elasticity of the bearings has been taken into account when calculating the deflection of the mixing device shaft, but this has been carried out on the basis of a high degree of customization: the behavior of the bearings has been considered linearly elastic, which does not correspond to reality because according to the elastic response of the bearing, it is a nonlinear function of the radial displacement. When the shaft of a mixing device operates in a pressure vessel, at the outlet of the pressure vessel, the shaft is provided with a sealing device, which can be considered a third bearing. This aspect is also not taken into account in the calculation of the shaft’s deflection, which leads to a certain degree of error in its determination. This study aims to highlight the influence of the elasticity of the bearings and the sealing device on the stiffness of the shaft and to propose a method that supports a calculation program for calculating the elastic line of a vertical cantilever shaft, considering the role played by the bearings in the case that they behave nonlinearly and the sealing device as the third bearing. This problem was solved both by applying our own method and with the help of the FEM. Full article
(This article belongs to the Special Issue Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building)
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19 pages, 5284 KiB  
Article
Using the AIDA Method in the Design of New Elements for the Photovoltaic Mounting Structures
by Vlad Andrei Ciubotariu, Cosmin Constantin Grigoras, Valentin Zichil and Bogdan Alexandru Chirita
Machines 2024, 12(3), 211; https://doi.org/10.3390/machines12030211 - 21 Mar 2024
Viewed by 1634
Abstract
To address diverse challenges and accelerate the adoption of PV technology, innovative and cost-effective PV assemblies are essential. The Analysis of Interconnected Decision Areas—the AIDA method—offers a promising approach to achieving this goal by providing a structured framework for identifying, assessing, and optimizing [...] Read more.
To address diverse challenges and accelerate the adoption of PV technology, innovative and cost-effective PV assemblies are essential. The Analysis of Interconnected Decision Areas—the AIDA method—offers a promising approach to achieving this goal by providing a structured framework for identifying, assessing, and optimizing the design of PV assemblies. The aim is to demonstrate how AIDA can be effectively used to identify and assess potential improvements in PV assembly design, leading to the development of more efficient, cost-effective, and environmentally friendly PV systems. For this, out of 54 combinations, 10 of them were retained, so that in the end only two possible solutions obtained by applying AIDA remained. Both structures were assessed by applying FEM, analysing data regarding equivalent von Mises stresses and displacements but also the existence of stress hotspots. A design insight study was also carried out. Also, the models were first built by additive manufacturing (3D printing). These models were evaluated by a manufacturer so that the evaluation matrix and criteria satisfaction matrix could be successfully completed. Therefore, AIDA can be successfully used in solving problems in product design in the field of mounting structures for PV panels. Depending on the manufacturer’s capabilities, the intended functions can be adapted quickly, because AIDA is quite simple to apply if the data of the problem are known very well. Following the application of the FEM it was concluded that the surfaces as simple as possible are to be followed in the design of components. Also, an assessment of environmental impact was successfully undertaken by means of software assistance. The decision to use one option or another is a subjective one. If the technical data are followed, then one type of structure is the one that the manufacturer should adopt as a solution to the problem. However, if the manufacturer considers that the impact on the environment is important and dedicates resources in this direction, then a different type of structure should be adopted. Full article
(This article belongs to the Special Issue Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building)
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16 pages, 8991 KiB  
Article
Experimental and Numerical Analysis of a Car Body Shield Loaded with a Ballistic Impact
by Maciej Mamys, Dariusz Pyka, Adam Kurzawa, Mirosław Baocian, Narcis Barsan and Krzysztof Jamroziak
Machines 2024, 12(2), 88; https://doi.org/10.3390/machines12020088 - 24 Jan 2024
Viewed by 1709
Abstract
This paper presents the possibility of using additional ballistic shields based on composite materials, which are applied to the body of a passenger car. A ballistic laminate made of Twaron T 750 aramid fabric with 5 mm thick and 2 mm thick magnetic [...] Read more.
This paper presents the possibility of using additional ballistic shields based on composite materials, which are applied to the body of a passenger car. A ballistic laminate made of Twaron T 750 aramid fabric with 5 mm thick and 2 mm thick magnetic foil was used. In the first stage, the mechanical parameters of the tested ballistic laminate system were determined in tensile tests. In field tests, the considered system was analyzed in terms of impact with a 9 × 19 mm FMJ Parabellum projectile, and then the results were numerically verified. The work was focused on the validation of numerical models. The appropriate correlation level of the numerical results was obtained with the fit, which was estimated at approximately 7%; furthermore, the results prove the correctness of this study’s research methodology. Full article
(This article belongs to the Special Issue Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building)
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Review

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36 pages, 1860 KiB  
Review
Machine Learning, Mechatronics, and Stretch Forming: A History of Innovation in Manufacturing Engineering
by Cosmin Constantin Grigoras, Valentin Zichil, Vlad Andrei Ciubotariu and Stefan Marius Cosa
Machines 2024, 12(3), 180; https://doi.org/10.3390/machines12030180 - 7 Mar 2024
Cited by 4 | Viewed by 4008
Abstract
This review focuses on the complex connections between machine learning, mechatronics, and stretch forming, offering valuable insights that can lay the groundwork for future research. It provides an overview of the origins and fundamentals of these fields, emphasizes notable progress, and explores the [...] Read more.
This review focuses on the complex connections between machine learning, mechatronics, and stretch forming, offering valuable insights that can lay the groundwork for future research. It provides an overview of the origins and fundamentals of these fields, emphasizes notable progress, and explores the influence of these fields on society and industry. Also highlighted is the progress of robotics research and particularities in the field of sheet metal forming and its various applications. This review paper focuses on presenting the latest technological advancements and the integrations of these fields from their beginnings to the present days, providing insights into future research directions. Full article
(This article belongs to the Special Issue Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building)
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