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• Analysis of Activity Times in the Process of a Wooden Box Manufacturing

  475-484

  László Pusztai

  Balázs Kocsi

  István Budai

  Lajos Nagy

  Views:

  112

  The main target of companies is to earn money and achieve profit. In order to fulfil these needs, companies have to reduce their costs. Cost reduction is often associated with bad quality products, but it could be done in a different way. Sometimes it is enough to examine only their own processes and then benefit from the process optimization, process improvement or process scheduling. In this article a case study is presented, in which the differences in a production scheduling are evaluated with the application of Monte-Carlo simulation and descriptive statistics. At the end of the paper the most efficient material sequence is selected at the manufacturing company by using weighted sum model

• Vehicle dynamics modelling of an electric driven race car

  106-114

  Szántó Szántó

  Gusztáv Áron Szíki

  Sándor Hajdu

  Views:

  102

  In the following we are presenting a vehicle dynamics simulation program developed in MATLAB environment. The program is capable of calculating the dynamics functions of a vehicle from its technical data. The program has been successfully applied for the optimization of the technical data of an electric driven race car that was designed and constructed at the Department of Mechanical Engineering of the University of Debrecen.

• Simulation of an Operating Machine in Dust Chamber

  266-275

  Sándor Tollár

  Betti Bolló

  Views:

  86

  Auxiliary equipment used in the automotive industry, such as generator, air conditioner, or starter, is often exposed to harsh conditions, for example splash water, frost, or serious dust load. Therefore, these auxiliary devices are intended to be prepared by the manufacturers to these conditions. The topic of this paper is a part of the analysis of the dust control of generators, which in principle is no different from the examination of other equipment. The flow around the generator and in the dust chamber was simulated by Ansys FLUENT.

• Topology Optimization of Acetabular Cup by Finite Element Simulation

  22-34

  Muhammad Ahmed Abdullah

  Views:

  397

  Hip replacements typically consist of a four-part piece. Our research will focus primarily on the acetabular component. Several different types of materials can be used when creating a hip replacement implant ranging from plastic to titanium. Different materials are used to accommodate for allergic reactions or circumventing potential health risks. Aside from the material, the size of the components plays a factor in terms of durability; a larger diameter head might avoid dislodgement though it could increase wear and tear on the stems through constant friction. A patient’s force applied to the hip replacement is usually measured through a number of physical assessments. Finite element analysis (FEA), a computer-based method of data observation, allows for us to accurately simulate hip forces and their impact on the hip replacements. Through this, it becomes easier to predict and calculate the performance of specific designs. Generative systems can also be used to support performance analysis and optimization through assessing a multitude of cases, many of which apply in real-world scenarios. By applying both systems, we designed and modeled an acetabular cup that when measured decreased the mass from 129 grams initially down to 52 grams, a 60% decrease in total mass. Furthermore, the design we created lessened the trauma on the piece through distributing force across the entirety of the piece rather than specific segments only. This shows an increased durability and life expectancy when compared to usual acetabular cups.

• Designing, Modelling and Analysis of Straight Turning Tool Geometry

  11-16.

  Csaba Nemes

  Sándor Bodzás

  Views:

  115

  We execute the planning, modelling and examination of straight turning tool geometry with the help of a software in the modelling space. Our aim is to create a programme that – given some lengths and angles – calculates the corresponding geometry. It establishes that as a wireframe model in a file format that is easily transmittable to the CAD softwares of today, so any additional changes can be done there. An optimal geometry can be defined for the best possible chipping conditions using finite element simulation and with given technological parameters and material quality standard.

• Numerical Model Analysis of Myring–Savonius wind turbines

  180-185

  M. Saleh

  Ferenc Szodrai

  Views:

  155

  Nowadays the importance of renewable energy is growing, and the utilization of the low wind energy potential is getting crucial. There are turbines with low and high tip speed ratio. Turbines with low tip speed ratio such as the Savonius wind turbine can generate adequate amount of torque at low wind velocities. These types of turbines are also called drag machines. The geometry of the blade can greatly influence the efficiency of the device. With Computational Fluid Dynamics (CFD) method, several optimizations can be done before the production. In our paper the Savonius wind turbine blade geometry was based on the so-called Myring equation. The primary objective of this paper was to increase the power coefficient by modelling the effect of the wind on the turbine blade. For the sake of simplicity, a 2D cross-sectional area was investigated in the simulation with ANSYS CFX 19.1.

• Visual Analysis and Geometric Modeling of Metal Foams

  89-92

  Tamás Antal Varga

  Tamás Mankovits

  Views:

  87

  The development of an efficient procedure for 3D modelling and finite element simulation of metal foams
  is one of the greatest challenges to engineer researchers nowadays. Creating 3D CAD model is alone a demanding
  engineering task due to its extremely complex geometry, and the proper finite element analysis process is still in the
  center of the research. The aim of this project is to analyze the related literature and to adapt the results may be
  considered.