Acta Technica Jaurinensis

Acta Technica Jaurinensis

Basic info

  • Publisher: Szechenyi Istvan University
  • Country of publisher: hungary
  • Platform/Host/Aggregator: Open journal system ojs
  • Date added to EuroPub: 2019/Sep/29

Subject and more

  • LCC Subject Category: Engineering, Multidisciplinary
  • Publisher's keywords: Engineering, Multidisciplinary
  • Language of fulltext: english

Publication charges

  • Article Processing Charges (APCs): No
  • Submission charges: No
  • Waiver policy for charges? No

Editorial information

Open access & licensing

  • Type of License: CC BY-NC
  • License terms
  • Open Access Statement: Yes
  • Year open access content began: 2008
  • Does the author retain unrestricted copyright? True
  • Does the author retain publishing rights? True

Best practice polices

This journal has '87' articles

Design Considerations by the Optimisation of PMS Motors

Design Considerations by the Optimisation of PMS Motors

Authors: B. Kollár
( 0 downloads)
Abstract

The determination of the targets, the input, implicit and design parameter is very important part in the design optimisation of the permanent magnetic synchronous motors for electric vehicles. We had to define the connections between them, made investigations which assisted to the appropriate optimisation. In this paper the researches for the design optimisation are presented which define the targets correctly and describes the results of the calculations and simulations of the slot fill factor.

Keywords: PMS motor, optimization, demagnetisation, slot fill factor, penalty function, electric vehicle
A Review of Current Challenges in Production Planning

A Review of Current Challenges in Production Planning

Authors: P. Szarmes
( 0 downloads)
Abstract

For manufacturing companies growing customer expectations, shortening product life cycles and increasing product variant numbers mean great challenges. Overcoming these is a major task for production planning, which is responsible for coordinating all business processes directly related to manufacturing. This paper presents important activities of production planning giving an integrative overview, and presents the digital factory concept with special attention to problems and their possible solutions. It concludes with challenges still waiting to be resolved and future development trends.

Keywords: production planning, digital factory, manufacturing process optimization
On Wavelet Based Modeling of the Nitrogen Oxides Emission and Concentration due to Road Traffic in Urban Environment

On Wavelet Based Modeling of the Nitrogen Oxides Emission and Concentration due to Road Traffic in Urban Environment

Authors: Sz. Nagy
( 0 downloads)
Abstract

Differential equations can be solved wavelet-based by representing the continuous functions by their wavelet expansion coefficients and thus the corresponding differential equations are transformed to matrix equations. The wavelet basis functions are organized into resolution levels of different frequency terms at different locations, and the main advantage of the wavelet expansion representation is that the wavelet based differential equation solving methods can be adaptive, it is possible to refine the solution locally, if the precision is not sufficient at some regions.In case of the nitrogen oxides convection-advection equation, the urban environment should be taken as special material parameter in the differential equation's operator, and the matrix elements of the differential operator has to be calculated in a non-continuous environment, and the obstacles are placed so, that they are not at the boundaries of the support of the wavelets.

Keywords: nitrogen oxides, wavelets, matrix elements, convection-advection, differential equation
Queuing Models and Subspace Identification in Logistics

Queuing Models and Subspace Identification in Logistics

Authors: P. Várlaki, T. Vadvári
( 0 downloads)
Abstract

In modern logistics it might be helpful to describe the behavior of a complex logistical process as well as to determine the strength of relations between certain parameters of the system. In this paper a subspace identification approach has been applied to estimate the relation between the features of the system based on measured input-output pairs. In order to validate the suitability of the approach for logistical processes a queuing based model has been proposed and used to generate simulation data. Our analysis as well as the obtained results clearly reflect that subspace identification approaches can advantageously be applied to model the relation between certain parameters of the system, nevertheless to characterize the strength of this relation, as well.

Keywords: subspace identification, queuing models, supply chains, modeling
Preliminary Assessment of Polycyclic Aromatic Hydrocarbons Associated to Airborne PM10 in Győr, Hungary

Preliminary Assessment of Polycyclic Aromatic Hydrocarbons Associated to Airborne PM10 in Győr, Hungary

Authors: A. Nagy-Szabó, Zs. Csanádi, J. Szabó
( 0 downloads)
Abstract

The aim of this study was to assess the ambient concentrations of polycyclic aromatic hydrocarbons (PAHs) associated to the PM10 aerosol fraction in an urban site of Győr, Hungary in 2011. The levels of total PAHs and the individual compounds show large variability during the sampling periods. The total PAH concentrations ranged from 0.88 ng/m3 to 95.80 ng/m3 with the mean value of 20.06 ng/m3. Four and five-rings PAHs were the dominant species in the samples. The levels of carcinogenic PAH species (benzo[a]pyrene, benz[a]anthracene, sum of the three benzofluoranthene isomers, indeno[1,2,3-c,d]pyrene and dibenz[a,h]anthracene) determined were compared with published data of other Hungarian cities. The potential carcinogenic risks of PAHs were also estimated.

Keywords: polycyclic aromatic hydrocarbons, PAHs, ambient air, air quality
Distinction of Road Categories by Road Users

Distinction of Road Categories by Road Users

Authors: G. Kosztolányi-Iván, Cs. Koren, A. Borsos
( 0 downloads)
Abstract

In order to create self-explaining roads, a remarkable difference should exist between road categories, whereas within a given road category the layout should be homogenous. The paper analyses, how many and which road categories are identified and distinguished by road users. A picture sorting task was completed to find out how road users group 45 different road scenes, and how these groups correspond to road categories according current standards.

Keywords: road safety, road category, road scene, survey participants, driving speed
Creating a two-way Land-Use and Transport Interaction model for Budapest

Creating a two-way Land-Use and Transport Interaction model for Budapest

Authors: M. Juhász, Cs. Koren
( 0 downloads)
Abstract

This paper intends to show that despite limited data availability it is still possible to elaborate semi-sophisticated LUTI models which can be a stepping stone for countries that are less developed in terms of transport modelling practice but eager to improve. It provides an outline of the model and of the calibrating process which was based on data from the city of Budapest. Based on the results it is undeniable that excluding land-use effects of transport in modelling could cause a serious distortion even in a shorter time period. It seems that such land-use effects and feedbacks can no longer be disregarded as it is not in accordance with the desire of improving transport modelling practice. From this aspect, the proposed approach is practical and can overcome general obstacles of time, cost and data availability issues. The next step should be to carry out tests for the estimation of real transport investments and compare the results with other models.

Keywords: land-use and transport interaction, modelling, urban transport, calibration
Rotational Motion Modelling for Numerical Analysis of Electric Machines

Rotational Motion Modelling for Numerical Analysis of Electric Machines

Authors: D. Marcsa
( 0 downloads)
Abstract

The paper presents a brief review of the movement modelling methods of electric machines and the two most common used torque calculation techniques. After the classification of single-layer moving band methods, a low computation cost and an easily realisable new variant of this movement modelling technique is proposed. To study the accuracy of proposed moving band technique equipped with Arkkio's method and Maxwell's stress tensor method for torque calculation an international benchmark problem used. Further, to check the applicability, the proposed method has been used to analyse a three-phase switched reluctance motor. The results of proposed method have been compared to analytical and numerical results.

Keywords: Rotational motion modelling, Finite element method, Torque calculation, Electric machine
Modeling and Identification of Supply Chains on Subspace Basis

Modeling and Identification of Supply Chains on Subspace Basis

Authors: T. Vadvári, P. Várlaki
( 0 downloads)
Abstract

Logistical processes play crucial role in many systems where the resourcesas well as tasks related to them are to be organized or scheduled in order toincrease the throughput of the system, thus the rate of servicing demands. Inthis paper let us focus on loading systems and supply chains which representa specific type of logistical processes. In order to increase the throughput of aloading system, delays caused by its certain subsystems are to be minimized.In our previous studies we have already shown how loading systems canbe identified on subspace basis and how the relation between its certainparameters can be characterized. In contrast this paper is aimed to showtrough examples how system delays affect the efficiency of subspace basedidentification applied on loading systems.

Keywords: subspace identification, queuing models, supply chains, modeling
Consideration on road transport vibration simulation techniques for packaging testing purposes

Consideration on road transport vibration simulation techniques for packaging testing purposes

Authors: R. Pidl
( 0 downloads)
Abstract

Transportation is essential for many logistics systems and vibration is one of the most critic physical circumstances on road causing numerous possible damage sources. One of the primary sources of these damages is often the broadband random vibration. This effect cannot be handled with formal mechanical models; therefore, vibration test simulation is essential for packaging testing. The current vibration systems use Power Spectral Density (PSD) functions to control the intensity of random signal in laboratory based on Fast Fourier Transformation (FFT). Naturally, the PSD frequency does not contain time series data making it hard to determine how long a given simulation should be performed. In this paper, mathematical and probability methods are presented that can be used for representing real vibration circumstances.

Keywords: packaging, vibration, acceleration, PSD, simulation
Individual Test Rig for Measuring the Creep Behaviour of Corrugated Board for Packaging

Individual Test Rig for Measuring the Creep Behaviour of Corrugated Board for Packaging

Authors: V. Köstner, JB. Ressel, B. Sadlowsky, P. Böröcz
( 0 downloads)
Abstract

Corrugated board is one of the most important and most popular packaging materials worldwide for transporting goods. Due to its hygroscopic behavior, it has a tendency to creep when subjected to stress under a constant load, which can ultimately result in loss of strength, with possible damage to products. The creep behavior of corrugated board is still a largely under-researched area. This paper attempts to examine the long-term behavior of corrugated board during use more precisely than before, and presents the first step and results of the research process. For the measurement, a compact and high-precision individual test rig was developed and used, in order to reduce the side effect of coupled systems, that is, to avoid their mutual influence. This paper successfully presents results reproducible with the described test rig apparatus for determining the creep behavior of corrugated board. It will be continued to publish further results of the research in the near future.

Keywords: corrugated board, creep behaviour, packaging material
Recycling of Mineral Water Bottles with Chemical Foaming

Recycling of Mineral Water Bottles with Chemical Foaming

Authors: V. A. Szabó, G. Dogossy
( 0 downloads)
Abstract

Today, in the field of packaging technologies there is an increasing amount of one-way polymer materials. Such materials after their short lifecycle are disposed, and such pose a serious environmental impact. However, PET is a good quality technical plastic; the recycled use must be provided. In our research, we have examined the recycled material of mineral water bottles. Chemical foaming of recycled polyethylene terephthalate (rPET) was applied for quality increased reusability. Significant results were achieved in terms of mechanical properties at specific mixtures of chain extender and impact resistance enhancer, at the foaming state of the injection moulding.

Keywords: rPET, recycling, chemical foaming, chain extender, polymer foam

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