gep20171borito1/2017

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•  1/2017 table of contents


Hanula Barna, Vizur Gábor László:
EVOLUTION OF ENGINEERING EDUCATION – WHAT REQUIRES THE GENERATION Z?     5
The social, economic and technological development in recent decades dramatically changed the work of engineers and at least in the same way young people entering the universities changed as well. It cannot be a surprise that the training must change significantly, to adapt to the new conditions. Those, who take part in the education need to consider the actual objectives, structure, content and methodology of training.

Pfliegler Péter, Várnai Beáta, Márton Ádám:
COMPREHENSIVE DEVELOPMENT OF TOWN MISKOLC     8
The article explains that in recent years the town Miskolc through comprehensive improvements developed using innovative technologies. Through the settlement of Hungarian and international companies it has become a modern, viable regional center, which plays a major role in automotive industry. Moving forward the town Miskolc plans to become a “green and clever” city.

Jármai Károly, Farkas József†:
OPTIMUM DESIGN OF A TRUCK FLOOR FOR MINIMUM MASS AND COST, USING DIFFERENT MATERIALS     13
In the article the floor structure of a truck produced by a company in Hungary has been investigated. The structure consists of steel members, or extruded Al-alloy longitudinal and cross members as well as a tread deck plate. Using an optimum design process, namely the Hillclimb optimizer, significant mass and cost savings may be achieved by decreasing the deck plate thickness and changing the profile, dimensions and number of cross members. Design constraints relate to fatigue stress range of welded joints, to local buckling of extruded or normal profiles and to fabrication size limitations.

Ervin Kerekes, Ákos Finta, Gábor Erdei, Miklós Tóth:
LIFE CYCLE EMISSION REDUCTION – THE INCREASING CHALLENGE FOR ENGINE DEVELOPMENT     19
According to the current directives the engines must comply with emissions standards throughout their useful lives. To ensure that the engine manufacturers can fulfil this legalization requirements an additional well-defined process was prescribed for the engine certification called Deterioration Factor Testing (DF). DFs are applied to account for any increase in emissions over the useful life of an engine. The certification engine must comply with emission standards after the DFs are applied.

Zsemberi Andor, Siménfalvi Zoltán Károly, Palotás Árpád Bence:
INVESTIGATION OF THE THERMAL-CATALYTIC CRACKING PARAMETERS     22
In this publication we present recycling options of various rubber tyre and plastics derivatives in combined material flow by means of applying thermo-catalytic degradation process at different temperature levels. This technology offers an opportunity to produce a secondary energy source (petrol- and gas oil-type hydrocarbons) and/or raw material for the chemical industry from the mentioned waste fraction.

Palotás Béla, Pogonyi Tibor:
RESULTS OF RESISTANCE SPOT WELDING OF AHSS IN UNIVERSITY OF DUNAUJVAROS     27
The paper shows the results of resistance spot welding of DP, TRIP, TWIP and HF steels, results proved that they can be welded without any grain growing. The results of research – which will be demonstrated in the paper – proved that these AHS steels shall be welded with complex welding schedules.

Szilágyiné Biró Andrea, Tisza Miklós:
INFLUENCE OF ACTIVE SCREEN BIAS VOLTAGE ON PLASMA NITRIDED LAYERS OF LOW ALLOYED NITRIDABLE STEEL     34
In most cases the surfaces of engineering parts have an important role in increasing lifetime: surface needs to be wear and/or corrosion resistant, while the rest of the part needs to be tough/ductile. The surface engineering can help to fulfil these complex requirements. Using this heat treatment technology, it is possible to produce a hard surface layer on the components. Nitriding is a widely used process to alloy the surface with nitrogen. Plasma technology is an environmental-friendly process.

Sója János, Sebestyén Zoltán, Czégény Zsuzsanna, Miskolczi Norbert:
TECHNOLOGIES FOR WASTE POLYMER PYROLYSIS     40
The amount of plastic waste is rapidly growing and generates serious problem. Thermal and thermo-catalytic pyrolysis looks attractive ways for problem solution, because valuable products such as pyrolysis oil and hydrocarbon gases could be obtained. There are a lot of technologies for this aim, which use batch, tubular, fix bed, fluid bed or rotating drum reactors. This paper is dedicated to summarizing the mostly used processes for waste polymer pyrolysis together with their main parameters.

Fenyvesi Bence:
CALIBRATION EXPERIENCES ON A VORTEX FLOW METER     45
The paper presents the diagnostic investigation of the effects of non-linear behaviour caused by the main measurement principle of vortex-shedding flow meters. The investigation includes the start to finish design and building of the calibration equipment, the description of the diagnostic method and the processing of the acquired data. The presented calibration method and the built equipment can be applied to several kinds of flow meter calibrations, it is not restricted to the case under investigation.

Varga Attila, Dr. Fenyvesi László, Dr. Keppler István:
INVESTIGATION OF MIXING EFFICIENCY WITH DISCRETE ELEMENT METHODS     52
The aim of the prior work was to quantify the mixing efficiency. To determine the effectiveness of the mixing process, the effective radius has been defined. With the effective radius, the optimal angular velocity of a screw auger has been determined. In the present article, we investigate, how the mixing efficiency changes with a given angular velocity in case of screw augers with different diameters.

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