Renáta Németh-Szigeti, Balázs Kósa and Kinga Éva Paczolai
The World Heritage of Pécs is the most valuable historical relic in the city. The conservation, presentation and continuous development is significant. The significant parts of the area are: the Cella Septichora, the Old Christian Mausoleum and the crypts in Apáca Street. Through the design process our prime task is the restoration and expansion of the former development in 2006. The study focuses on creating the Cella Septichora concept.
Nowadays the usage of glass fibre-reinforced plastics (GFRP) is increasing. The cutting of these materials entails several problems, e.g. the strong abrasive wear effect of the glass fibres or delamination effects. In this paper, we examine the results of drilling experiments on a 10 mm thick GFRP which included 26 layers. The cutting parameters were changed over a wide range. During the experiments, we measured the average surface roughness parameter (Ra). After the tests, we examined the effect of the cutting parameters on the measured roughness values. We created two types of predictive model to estimate the roughness parameter and compared their applicability.
The city of Pécs was already an important commercial and religious centre in ancient times. Because of the city’s location, it has become one of the most important cultural hubs in Central Europe. In Pécs, in various historical times, many different cultures have flourished and one of the most typical imprints of these cultures are cemeteries and burial buildings. The subject of our research is to compare Idris baba’s türbe with another iconic heritage of Pécs, the Early Christian Cemetery, furthermore as an example of this cemetery’s visitor centre, designing a plan that reattaches the neglected Turkish cemetery to the city’s life.
Zoltán Hodai, Dora Rippelné Pethő, Géza Horváth, László Hanák and Róbert Bocsi
In opened systems with liquid-phase (for example open-source bioreactors for various purposes) very significant temperature can be generated. The operation of the system can be impaired, possibly completely inhibited (too low, too high temperature values). The analytic description of the operation’s heat flow is needed to achieve the optimized operation and to block the thermodynamic inhibition. The aim is to examine the inner system opportunities and the auxiliary energy. The estimates values quantify the effects of atmospheric electromagnetic radiation on opened systems. Based on the developed model by increasing the complexity of the method, it is appropriate to describe the heat flow of opened systems and to explore the energy integration possibilities.
In today’s world, where competition is becoming increasingly prominent, companies need to focus on several aspects in order to be successful in their operations. Purchasing is essential to achieving this goal, so suppliers can be evaluated as well. A new approach is created based on the QFD method for evaluating suppliers, which can be quickly and easily performed, even without the help of a computer. This method was tested in a company based in a North Eastern Hungarian city. Firstly, suppliers were selected by ABC analysis and then the expectations were defined and compared based on the order of their preference matrix. The three categories were A, B and C, one supplier achieved a place in the best category, two suppliers a place in the second category, five suppliers joined the third category. Furthermore, Suppliers were categorized by Kraljic matrix. The supplier rating which was based on the QFD (Quality Function Deployment) method, allows analysis of the performance of a given supplier in an easy way within the company and to develop them over the long-term in order to make the company more successful based on the results of combined work.
Spot welding is widely used in car industry to create a cheap and light body and chassis. Engineers tend to use spot-welding in order of reducing the production costs, also lowering the stress intensity which can cause failure and fractures of the body or chassis. Our goal here is to examine spot-welding of a car body with different tests and find out later if there is a possibility of using a different technology that can produce a better seam that can be automated with industrial robots.
The recent years, 3D printing has become a hot topic, however, it’s hard to design parts without a deep understanding of the material properties. The aim of this study is to estimate the modal parameters and the damping properties via experimental dynamic analysis of a part made from PLA. We will study the effects of the different directions of printing. With the results we can provide data for FEM software input.
Gears are torque and motion transmision elements required for gearboxes. Adequate consideration must be given to the material selection and heat treatment of these gears. Inappropriate material selection or heat treatment will lead to premature failure of the manufactured gears or early refurbishment. In our publication, we present a number of practical failures that can be traced back to wrong material selection or heat treatment operation.
In this article, a finite element modeling of the upsetting of a cylindrical workpiece is presented. In the modeling, the effects of friction, heat generation from deformation, and heat losses from conduction and convection are considered.
The aim of this paper is the presentation of the general form of the constraint equations necessary to calculate the accelerations occuring on a five sided spatial mechanism. Using these equations the computing of the accelerations for any part of any plain or spatial mechanism will be possible.
The constraint equations of the acceleration are obtained by computing the time derivatives of the velocity equations (which in general form are given by  and ) followed by the correspondent grouping of the unknowns.