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EN
The paper presents an application of a compliant foil bearing for estimation of the thrust force in the single stage radial blower under operational conditions. The bump foil of the thrust bearing behaves as a nonlinear spring. The knowledge of the spring deflection curve allows one to estimate the actual thrust force for a measured bump deflection at the given rotational speed. To acquire the deflection curve, static calibration of the axial shaft displacement sensor was performed. During the calibration, the information about voltage signals of the sensor for the given loading force was gathered. Then, the measured voltage values at different speeds and loads were recalculated to the thrust force. The results were verified by a comparison to the thrust force resulting from the pressure distribution on the impeller.
PL
W artykule przedstawiono aspekty teoretyczne i uwarunkowania techniczne regulacji promieniowych maszyn sprężających drogą zmiany częstości obrotów. Omówiono, opierając się na charakterystykach rzeczywistej sprężarki ograniczenia tego sposobu regulacji. Poruszono zagadnienie napędu sprężarek pracujących przy zmiennych częstościach obrotów.
EN
The article is devoted to theoretical and technological aspects of regulation of the radial compressing machines with the use of variable rotational velocity. The consideration includes pressure characteristics obtained at the real experimental stand. Authors outline the limitations of such a regulation method and the technical problems connected with motors running compressor at a variable rotational speed.
4
Content available remote Investigations of coating materials for air-foil bearings
EN
Air-Foil Bearings are popular topics of research as a new kind of rotor support systems. Their specific construction brings a possibility of working with high rotational speeds at low power losses in a wide temperature range. Despite many advantages, Air-Foil Bearings meet problems of friction and wear in critical moments of their operation. The paper presents investigations of the materials which reduce an influence of undesirable effects.
EN
The design of a small turbo-generator to produce electricity in the range from a few kWs requires the use of an aerostatic or aerodynamic gas bearing system. The theoretical analysis and the experimental test at the present stage of the study show that such highly rotating constructions are feasible. The problem consists in the optimal design selection from the viewpoint of the machine reliability and the adjustments are connected to the diminution in static thrust and lateral loads of the bearings by a correct design of the turbine flow structure and a correct selection of the gas bearing type.
PL
Przedstawiono możliwości zastosowania drutów proszkowych (rdzeniowych) Outershield 12-H, Outershield 19-H, Outershield 20-H do wykonania połączeń spawanych stali energetycznych w celu zwiększenia efektywności wykonania takich połączeń wraz z obniżeniem kosztów. Przedstawiono badania metalograficzne (makroskopowe) wykonanych złącz próbnych z użyciem drutów proszkowych firmy Lincoln Electric oraz analizę kosztów wytworzenia takich połączeń w stosunku do najczęściej stosowanych obecnie metod.
EN
Presented is Outershield 12-, 19- and 20-H fluxcored wires possible application for welded joints of steels used in power industry, with the aim to increase effectiveness of such joints together with cost reduction. Presented are metallographic (macroscopic) examinations of the experimental joints welded with the use of Lincoln Electric fluxcored wires, as well as the cost analysis of such joints compared to the most frequently used methods.
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