Prefacedoi: 10.1088/1757-899X/659/1/011001pmid: N/A
The 9th International Scientific Conference - IRMES 2019 - Research and Development of Mechanical Elements and Systems was organized by the Department for Mechanical Constructions and Mechanization of the Faculty of Engineering at the University of Kragujevac and the Association for Design, Elements and Constructions – ADEKO from September 5th to the 7th 2019 at the Faculty of Engineering in Kragujevac.On the previous eight IRMES Conferences (the first in 1995, the last in 2017), around a thousand papers have been presented, and there were over a thousand participants from all over the world. A long and successful tradition is a stable basis for organizing this and future IRMES Conferences.The mission of IRMES Conferences is to serve the global community by improving, spreading and applying new engineering knowledge, with the goal of being used as a source of the newest and most relevant information for mechanical engineers and experts in related fields – on a local, regional and global level.Specific goals, themes and fields of the IRMES 2019 Conference are defined in cooperation with the ADEKO association, and in accordance with current topics and problems. Thematic units of the conference are: Mechanical Elements and Systems (modeling and simulation, loading and stress conditions, tribology, noise and vibrations, maintenance and monitoring, safety, quality, reliability), Power and Motion Transmission Systems (development of new concepts, modeling and simulations, noise and vibrations, testing, safety, quality, reliability), Product Development Process (technology transfer, creativity and innovations, development and design, innovative product development, smart systems, industry 4.0, knowledge economy), New Technologies and Materials (CAD/CAM/CAE technology, intelligent production systems, robotics and mechatronics, rapid prototyping, new materials), Research and Development in Field of Vehicles and Transport, Power and Motion Transmission Systems and a Special Section “Toward a Sustainable Mobility”.We have ensured a wide international participation, in order to have as many high quality research papers as possible and in order to increase the significance and influence of IRMES Conferences on a global level. We would like to thank the reviewers on their hard work and dedication, which have increased the quality of the IRMES 2019 Conference.We would like to thank all keynote speakers, authors, committee members, reviewers, sponsors and others who have helped this Conference and attributed to its quality and importance.Conference Chair of IRMES 2019Professor Nenad Marjanović, PhDKragujevac, 7th September 2019
Peer review statementdoi: 10.1088/1757-899X/659/1/011002pmid: N/A
All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.
Research on designing a multiloop planar linkageBadoiu, D; Toma, G
doi: 10.1088/1757-899X/659/1/012001pmid: N/A
The paper presents the way of determining the dimensions of the elements of a planar linkage when imposing certain conditions regarding the movement of a component piston, aiming at obtaining a mechanism whose total mass is minimal. A computer program that simulates the kinematics of the analyzed mechanism has been developed by the authors using Maple programming environment. The NLPSolve function included in the Optimization Package of Maple has been used for establishing the dimensions of the elements that assure the minimal mass of the linkage. Finally, some simulation results are presented.
Simulation of ejector for vacuum generationMacia, L; Castilla, R; Gámez, P J
doi: 10.1088/1757-899X/659/1/012002pmid: N/A
Supersonic ejectors are used in a wide range of applications such as compression of refrigerants in cooling systems, pumping of volatile fluids, or vacuum generation. The objective of the present paper is to mesh and simulate, in an OpenFOAM environment with an open access implicit density-based solver HiSA, the physics of the vacuum ejector, and, later, compare the results with experimental measurements. In order to achieve this a 2D axisymmetric mesh made by hexahedral cells has been created. Steady solutions have been obtained, with prescribed total pressure in primary and secondary inlets. Secondary total pressure ranges from 1 to around 0.2 bar in which the secondary flow is zero. Numerical results are compared with experimental measurement, with two flowmeter sizes for small flow rate accuracy. Two regimes are encountered. In supercritic regime the secondary is chocked and sonic flow is reached in the second nozzle. In subcritic regime, the secondary flow is subsonic. The agreement is good, although simulation tends to slightly overestimate flow rate for large values region.
Reliability of cylindrical tank exposed to fireDelosevic, M; Sremac, S; Tepić, G
doi: 10.1088/1757-899X/659/1/012003pmid: N/A
The paper presents a methodology for assessment the reliability of tank due to typical accidents. The aim of the research is to identify fracture lines and shapes of fragments generated by tank explosions. Accident scenarios and their probabilities are defined with Event Tree Analysis (ETA). Static structural analysis of the tank is realized by the software package ANSYS 15. The probabilistic mass method (PMM) was used to assessment the shape of the fragments. The assessment of the reliability of the tank affected by the fire was carried out according to Fault Tree Analysis (FTA). Verification of the results obtained was made according to available accidents. It has been found that the construction of the tank and especially the type of end caps affects the fragmentation pattern, i.e. the shape of fragments created by explosion. The results of the research are practically usable during the design of the tank because they provide information that is not contained in EN 13445-3.
Effect of friction on nominal stress results in a single tooth bending fatigue testVukic, M; Čular, I; Mašović, R; Vučković, K
doi: 10.1088/1757-899X/659/1/012004pmid: N/A
One of the main reasons for gear failure is bending fatigue, which occurs due to cyclic stresses at the tooth root region. Bending fatigue can cause crack initiation which, in turn, may propagate and result in catastrophic tooth breakage. Single tooth bending fatigue tests are frequently employed to generate statistically significant fatigue data at relatively low price. Hence, they are often employed as screening tests for bending fatigue behaviour of actual running gear pair. Since relatively small alteration of nominal tooth root stress values can produce significant change in bending fatigue lives, it is important to adequately consider the effect of friction and test fixture deformation when conducting single tooth bending fatigue tests. In this paper, numerical investigation of tooth flank friction effect on spur gear load capacity during single tooth bending fatigue test is carried out. Two different test fixtures are considered. Linear elastic finite element analysis is carried out to obtain nominal tooth root stresses. The results show that friction at gear tooth flank as well as fixture deformation can affect nominal tooth root stress results.
Contact pressure analysis of slewing ringsSkyba, R; Hrček, S; Smetánka, L; Majchrák, M
doi: 10.1088/1757-899X/659/1/012005pmid: N/A
The paper deals with creation of functional parametric 3D model of slewing bearing. The slewing bearing is loaded by the radial force that acts from the centre of the bearing and it is also perpendicular to the axis of bearing. 3D fully parametric model of slewing ring was designed in Creo Parametric 3 and it is controlled by the ball diameter. To calculate several geometric bearing modifications, the 3D model from Creo was imported to the Ansys Workbench computational program. Based on many analysis in Ansys, it is possible to evaluate the size of contact pressures, determine the most loaded place and compare values between individual bearing modifications. By transferring the measured values of the contact pressures to the Microsoft office, it was possible to construct a graphical dependence between the values of measured stresses and the magnitude of the radial force acting on the slewing bearing.
Gears or rotors - three approaches to design of working units of hydraulic machinesStryczek, J; Bednarczyk, S; Codina, E; Gamez-Montero, P J; Ivanovic, L; Matejic, M
doi: 10.1088/1757-899X/659/1/012006pmid: N/A
The gerotor pump has many advantages over other hydraulic pumps, such as high reliability, compactness, lower noise in running conditions etc. Considering the increasingly stringent regulations in the field of environmental protection, one of the main goals in the industrial applications of gerotors is to improve their design by using light materials and optimize their performance. This paper will give an overview of modern research that focuses on improving the performance of gerotor pumps. A joint publication of three university centers, namely of Wroclaw, Terrassa and Kragujevac, presents their original approaches to the problem of designing gerotor and orbital systems. The presentations have been prepared in separate parts, but according to similar rules. The first part of the paper focuses on meshing between internal and external gear of gerotor. Analysis for both cases, moved axis and fixed axis, will be provided in accordance to their working characteristics and their application. The second part of the paper provides the design of a gerotor pump strikes a balance between volumetric efficiency, manufacturability and mechanical efficiency. The third part of the paper defines the methodology for selecting the best combination of geometric form parameters of the trochoidal gearing in relation to the reduction of contact stresses and improving other characteristics of the pump. All three parts provide manufacturing and application review in the fluid power machines. Paper concludes with presented theoretical and experimental review of the authors and their practice achievements.