gep201011borito11/2010

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•  11/2010 table of contents

Orbulov, I.:
Microstructural investigation of metal matrix syntactic foams
Syntactic foams are composites in which the metal matrix contains hollow micro-spheres as porosity source. According to author’s investigation when the matrix is Al, harmful chemical reactions take place at the metal-ceramics phaseboundary.
These reactions can be eliminated by use of AlSi12 alloy matrix.

Jesch, D., Kristóf, G., Vad, J.:
Execution and application of a side channel pump test facility
Paper describes the build up an optically accessible model fuel pump, which is a scaled-up version of a real one and shows some characteristic features of the test equipment. The experimental facility seems to be capable for studying various flow phenomenons (such as cavitation).

Vad, J.:
Design and measurement of axial flow flue gas extractor fans of high specific performance and energetically favourable operation
The main features and practical advantages of ‘controlled vortex’ design applied for axial flow fans is presented. The application of controlled vortex design is demonstrated in an example of industrial prototype fan with outlet guide one.

Czél, B.; Gróf, Gy.:
Sensitivity analysis for the evaluation of a thermophysical property meas-urement method with numerical approach
In case of use of numerical approach measurement methods, the direct problem of heat conduction has no restrictions, but the evaluation becomes more difficult. Applying sensitivity analysis the possibility of estimation of the unknown parameters through the inverse solution can be examined.

Bothné Fehér, K.; Örvös, M.:
Mass transfer properties at sulphur dioxide control
Gas and liquid side mass transfer coefficients (HOG, HOL, KGa, KLa) were de-termined by experiment which make possible dimensioning of equipment used for reducing SO2 emission.
Results were compared with different packing based on literature.

Szűcs, J.; Váradi, K.; Zobory, I.; Szabó, A.:
Wear behaviour of a brake block-wheel connection
Paper presents the experimental investigation of the wear behaviour of a brake block–wheel connection using a test machine installed at the Railway Vehicle and Vehicle-system Analysis Department, BME. Parallel to the laboratory measurement FEM analysis has been carried out in order to develop a wear simulation method.

Zwierczyk, P.;Váradi, K.:
FE analysis of the frictional state of a wheel brake block connection
Paper describes a model in which the brake system fails and the braking force ex-ists in the time when the train departs. The elaborated FEM model is allow to cal-culate the brake block’s displacements and the stress distribution in the initial sticking state and the transition into the slip state.

Samu, K.; Góz, A.:
A modern manufacturing technology: laser microprocessing
In the microprocessing field of mechanical engineers laser beam can be used for different purposes such as cutting, engraving, heat treating, welding and nanotechnology processes. Among the advantages of the laser manufacturing the high accuracy, reliability, safety, controllability, rapidness and automated character can be mentioned.

Takács, D.; Stépán, G.:
Lateral instability of towed structures
Authors constructed a low degree-of-freedom mechanical model for examination of lateral instability of towed structures. In spite of the few parameters involved in the model a new stability condition were deduced, which is easily controllable in practice and well utilisable from engineering aspect.

Szekrényes, A.:
Application of the MMB fracture test with long crack lengths
Author shows the application of the mixed-mode bending (MMB) test developed in 1988 to measure the interlaminar fracture toughness of composite materials. With a small modification the system can be used for examining composites having long crack length.

Szalay, T.; Székely, F.:
Nanometer-precision machining of glass microlenses
The EU supported integrated research project Production4μ deals with the devel-opment of mass production technologies for high precision optical parts. Illustrat-ing with examples paper describes the characteristics of machining the high precision glass microlenses manufactured by moulding process.

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