Acta Technica Jaurinensis

Acta Technica Jaurinensis

Basic info

  • Publisher: Szechenyi Istvan University
  • Country of publisher: hungary
  • 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

  • Permanent article identifier: DOI
  • Content digitally archived in: Other
  • Deposit policy registered in: None

This journal has '87' articles

Stress Analysis and Weight Reduction of a One-Cylinder Engine Crankshaft

Stress Analysis and Weight Reduction of a One-Cylinder Engine Crankshaft

Authors: P. Horváth, J. Égert
( 0 downloads)
Abstract

The article deals with the weight reduction and the achievement of a more homogeneous stress distribution of a one-cylinder engine’s crankshaft, developed for the Formula Student series. In order to achieve this goal, a series of static FEM analysis were performed on the crankshaft. For the FEM analyses, the critical loading and kinematic boundary conditions of the crankshaft were calculated with two different methods. The loads were determined analytically and were verified by Creo Mechanism software. The calculations were done for different engine speeds and - as a result - the critical engine speed, where the highest loads appear could be determined. An essential weight reduction and a more homogeneous stress distribution were achieved on the crankshaft as the result of FEM analysis. 

Keywords: crankshaft, finite element method (FEM), weight reduction, stress distribution
Estimating the Thermal Bridge at Wall Corners with Artificial Neural Network

Estimating the Thermal Bridge at Wall Corners with Artificial Neural Network

Authors: M. Orosz, J.E. Csanaky
( 0 downloads)
Abstract

Nowadays there are several software products to simulate the heat transfer at thermal bridges.  These sophisticated tools are mostly based on Finite Difference or Finite Element Methods. However, there is a demand from energy modelers to estimate the linear thermal transmittance and the lowest internal surface temperature from existing data, instead of employing time-consuming simulations for each case.  This paper investigates wall corners with and without thermal insulation by using Artificial Neural Network (ANN), as a Soft Computing technique. It gives simple formulas that estimate the thermal bridge at wall corners with an acceptable level of accuracy.

Keywords: thermal bridge, linear thermal transmittance, artificial neural network, radial basis function
Traction Energy Consumption of Electric Locomotives and Electric Multiple Units at Speed Restrictions

Traction Energy Consumption of Electric Locomotives and Electric Multiple Units at Speed Restrictions

Authors: Sz. Fischer
( 0 downloads)
Abstract

In this article the author reports the measurements made by traction measuring car of Railway Engineering and Metrological Service Centre (REMSC) in the research and development work “Complex investigation of reduction possibilities of additional costs due to speed restrictions on electric traction railway lines”. As results it can be stated that a correction parameters in the research and development work made between 2008 and 2010 should be changed because of specifying. These parameters can be used for calculation of additional acceleration energy after speed restriction sites.

Keywords: railway engineering, traction energy consumption, speed restriction, locomotive, EMU
Evaluation of Head Movements in Short-term Measurements and Recordings with Human Subjects using Head-Tracking Sensors

Evaluation of Head Movements in Short-term Measurements and Recordings with Human Subjects using Head-Tracking Sensors

Authors: G. Wersényi, J. Wilson
( 0 downloads)
Abstract

Measurements for spatial hearing research, binaural recordings, virtual reality techniques etc. often rely on Head-Related Transfer Functions of human subjects, head-tracking techniques etc. Individually measured HRTFs and recordings on human heads may result in more accurate localization and sound field rendering. On the other hand, the measurement and recording procedure raise new problems such as decreased signal-to-noise ratio or subject comfort. For measurements with human subjects lots of methods are used from free heads to different head fixations methods. This study analyses the range of unwanted head movements during measurements using different sensors and environmental conditions based on the circular angle variance, errors in yaw-pitch-roll directions and magnitude of standard deviation. Results show errors about 2 degrees and magnitudes of standard deviation of 2-8 cm depending on the situation as well as a preference for sitting instead of standing posture.

Keywords: head movement, binaural recording, HRTF, visual tracking
A New Metaheuristic Optimization Algorithm, the Weighted Attraction Method

A New Metaheuristic Optimization Algorithm, the Weighted Attraction Method

Authors: G. Friedl, M. Kuczmann
( 0 downloads)
Abstract

The paper presents a novel, particle behavior--based metaheuristic global optimization method. The idea behind the algorithm is based on attraction between particles, and in some aspects it is similar to the particle swarm optimization, but the interaction between particles is realized in a completely different way. The paper shows the main steps of the technique and some possible modifications. After that the comparison of efficiency and the speed of convergence with different well-known algorithms on two objective functions will be shown.

Keywords: Weighted Attraction Method, metaheuristics, global optimization, swarm intelligence
A Wavelet Transform Based Study on the Representativeness of Preselected Frequency Points of the Insertion Loss Function in Fuzzy Performance Evaluation of Access Network Links

A Wavelet Transform Based Study on the Representativeness of Preselected Frequency Points of the Insertion Loss Function in Fuzzy Performance Evaluation of Access Network Links

Authors: F. Lilik, S. Nagy, L. Kóczy
( 0 downloads)
Abstract

The performance evaluation of telecommunication networks and connections is a usual problem of telecommunications service providers and network owners. The performance evaluation in our previous approach is strongly (but not exclusively) based on the insertion loss values of the wire pairs measured at certain discrete frequency points. According to experimental results, the usage of these frequencies leads to correct evaluation, however, the theoretic verification of the correctness of the placement of these points seems to be necessary. The study was carried out using wavelet analysis, comparing the insertion loss values measured at the discrete frequency points with the wavelet transformed sections of the insertion loss functions corresponding to them. In this paper, using wavelet transform, we have studied whether the previously selected characteristic frequencies represent well the frequency domain around them also rules using wavelet transformed data are compared to the rules of the method based on characteristic frequencies.

Keywords: telecommunications, performance evaluation, access networks, fuzzy inference, wavelet analysis
State Space Estimation for an Electromechanical Actuator Valve Using Extended Kalman Filter

State Space Estimation for an Electromechanical Actuator Valve Using Extended Kalman Filter

Authors: Zs. Horváth
( 0 downloads)
Abstract

This paper presents a state space estimation for an Electromechanical Actuator Valve using Extended Kalman Filter (EKF). A proposed actuator model includes a Tustin’s friction model with strong nonlinearities, hence it represents an accurate model for describing the friction phenomenon in an Electromechanical Actuator valve. In my work the EKF is used for estimation of three states, namely the motor current, valve angular velocity - and position. Both the actuator model and the EKF algorithm were implemented in MATLAB®. The measurements to input data in the EKF are performed in National Instruments CompactRIO system. Outline of our examination should be to take a conclusion, how much EKF is capable for accurate estimation of the desired states. Furthermore we will use this method for further developing the fault detection in the Electromechanical Actuator Valve.

Keywords: extended Kalman filter, electromechanical actuator valve, state space estimation, Tustin’s friction model
Study of 2D and 3D Methods for Worn Surface Analysis of Tool Materials

Study of 2D and 3D Methods for Worn Surface Analysis of Tool Materials

Authors: I. Hatos, H. Hargitai, L. Solecki
( 0 downloads)
Abstract

This paper is dealing with the comparison of the results given by different worn surface analysing methods. Maraging steel tool materials were used for the experiments. Specimens were produced by direct metal laser sintering from metal powder and by conventional way from rod having equivalent chemical content. The samples were age-hardened and surface treated by nitrocarburising and oxynitriding and they were tested by pin-on-disc type tribometer. The tribological behaviour was compared by using different methods for worn surface analysis.  Worn area of the surface was determined by the surface profiles of 2D measurements and the worn surface volume was calculated by using 3D images of focus variation microscopy measurements.

Keywords: worn surface analysis, focus variation microscope, maraging steel, heat treatment
The Initiation of Safety-Enhancing Actions in Railway Crossings Using Modelling Procedures

The Initiation of Safety-Enhancing Actions in Railway Crossings Using Modelling Procedures

Authors: L. Szabó, M. Somogyi, G. Horváth
( 0 downloads)
Abstract

Thisstudy is examining the application opportunities of models, and it is revealinga possible solution which can be the basis of creating a catalogue which canestablish the reconstruction of railway crossings.  This reconstruction catalogue is suggestinginfrastructure changes and new traffic management procedures with takingaccount of the controlled model outputs. Based on the reconstruction catalogue,feasibility studies and construction project documentations can be made.papercontains the description of the prescribed format of the papers published inthe periodical entitled “Acta Technica Jaurinensis”. The length of the abstractis between 500-1000 characters including spaces. Avoid using references in theabstract.

Keywords: hazard ranking, degree of traffic safety risk, system of revision aspects, Evaluation Matrix, reconstruction catalogue
Iterative Calibration of VISSIM Simulator Based on Genetic Algorithm

Iterative Calibration of VISSIM Simulator Based on Genetic Algorithm

Authors: T. Tettamanti, A. Csikós, I. Varga
( 0 downloads)
Abstract

In the recent decade, computer simulation has been developed enormously in all engineering fields and has become a basic step of design. Accordingly, simulation plays a fundamental role in road traffic engineering offering a basis for the effective analysis of intelligent traffic control systems. A reliable simulator is able to provide effective analysis of a given traffic network if the applied simulation scenarios properly converge to the real-word situation. This requirement can be achieved based on the mixed use of prior real-world traffic measurements and proper simulation settings.  The latter one, however, is not straightforward. Accordingly, the paper proposes a potential calibration method to create true-to-life VISSIM simulations. VISSIM is one of the most popular microscopic traffic simulator, a well-known software applied in engineering and scientific practice as well. Basically, a calibration technique with genetic algorithm optimization is proposed to reproduce realistic traffic on a network based on floating car speed data.

Keywords: Vissim simulator, calibration, genetic algorithm
Decision Support Model to Select Cushioning Material for Dynamics Hazards During Transportation

Decision Support Model to Select Cushioning Material for Dynamics Hazards During Transportation

Authors: Á. Mojzes, P. Böröcz
( 0 downloads)
Abstract

Designing a product-packaging system is a complex challenge for engineers. Building a suitable and sustainable system the packaging engineers have to take into consideration many aspects, demands and requirements. To protect the product by packaging-system from physical events during transportation, handling and warehousing the cushioning has got a significant role, because this means the primary protection. This paper aims to give a model help to decide the applicability of different cushioning materials based on their protective, sustainable and economical attributions. This model ranks the different types of packaging materials choosing the final optimal solution. Our study also introduces a determinant, which is in connection with the mechanical characteristic (cushion curve) of the material on different environmental factors.

Keywords: packaging, cushioning, decision support model, product-package system
Historical Development and Special Building Structures of In-earth Embedded Houses

Historical Development and Special Building Structures of In-earth Embedded Houses

Authors: D. Bozsaky
( 0 downloads)
Abstract

Earth houses have been traditional residential buildings for a long time and their three different types (in-hill house, cave dwelling and atrium house) were separated during the early history. Modern earth house architecture was born in the 1960s in the USA but spread only after the first oil price explosion in the 1970s. Earth-sheltered houses became popular nowadays because of their several benefits (environmentally friendly, economical, energy savings, landscape protection, fire protection). Unfortunately they have some disadvantages (negative prejudices, high building costs, special building constructions, complicated design and construction) this is why we can come across these houses very rarely. The well-designed orientation, insolation, ventilation, damp and thermal insulation is essential to have pleasant and comfortable atmosphere inside.

Keywords: in-earth embedding, earth-sheltering, special building structures
Longitudinal Behaviour of Embedded Rails

Longitudinal Behaviour of Embedded Rails

Authors: Z. Major
( 0 downloads)
Abstract

The longitudinal behaviour of embedded rails significantly differs from that of ballasted and slab track with direct rail fastening. As the ambient temperature rises and falls, rails expand and contract, imposing stresses on the channel and the embedding compound. In my article I presented the creation of a method that makes the calculation and the checking of embedded rails simpler and becomes closer to everyday engineering mentality. My design process includes an analysis of displacement and normal forces along the rail axis.

Keywords: embedded rail, longitudinal behaviour, breathing length of ERS
Safety Considerations Regarding to the Shielding of Electric Fields During High Voltage  Live-line Maintenance

Safety Considerations Regarding to the Shielding of Electric Fields During High Voltage Live-line Maintenance

Authors: G. Göcsei, I. Berta, B. Németh
( 0 downloads)
Abstract

Live-line maintenance (LLM) has several technical and economic benefits. Planned works can be executed without any consumer disturbance, while the network is energized. Strict regulations regarding to the working method, well-educated workers and well-considered safety factors ensures the high level of safety of this technology. Although statistics show that the number of injuries is lower than in case of de-energized works, the unseen short- and long term effects of electric and magnetic fields also have to be taken into consideration.

Keywords: live- line, maintenance, electric, field
Toughness Improvement in Ternary HDPE/PS/PET Polymer Blends with Compatibilizer

Toughness Improvement in Ternary HDPE/PS/PET Polymer Blends with Compatibilizer

Authors: K. Dobrovszky, F. Ronkay
( 0 downloads)
Abstract

Preparing polymer blends is an efficient way to develop new raw materials. In the present study, the morphological and mechanical properties were investigated in ternary polymer blend. The three immiscible plastics were polyethylene terephthalate (PET), high density polyethylene (HDPE) and polystyrene (PS), which can be found in post-consumer waste in large quantities. Three different processing methods, internal mixing, extrusion and injection moulding were used during the production. Two different kinds of compatibilizer agents were also added to the blend. The results show that the best mechanical properties can be achieved if the ternary polymer blends are produced by extrusion followed by injection moulding or direct injection moulding was used without any previous homogenization, and styrene/ethylene-butylene/styrene copolymer grafted with maleic anhydride (SEBS-g-MA) was also added to the polymer blend.

Keywords: ternary blend, compatibilization, toughness, scanning electron microscopy

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