Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Modelowanie cieplne wrzecion szybkobieżnych

Kondziołka Ł., Kosmol J.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

2012

nr 1

17--28

W artykule przedstawiono analityczny sposób wyznaczania oporów ruchu w łożyskach na podstawie doniesień literaturowych. Stwierdzono, że poszczególne modele analityczne różnią się znacznie, co do ilości obliczonego ciepła. W drugiej części artykułu przedstawiono badania numeryczne metodą elementów skończonych na przykładzie układu wrzecionowego, zbudowanego w postaci stanowiska badawczego. Wyniki badań symulacyjnych pozwoliły na wyznaczenie rozkładu temperatur oraz na ocenę wpływu prędkości obrotowych i napięcia wstępnego łożysk na rozkład i wysokość temperatur. Te wyniki symulacji będzie można zweryfikować na opracowanym stanowisku badawczym.

Analytical method of motion resistance calculation of rolling bearings, basing on literature was presented in the paper. It was confirmed that respective analytical model s differ very much from the point of view of calculated quantity of heat. In the second part of the paper numerical investigation using. Finite Element Analysis was shown, basing on an example of spindle configuration, built as an experimental stand. Simulation results made possible to identify the temperature distribution and to estimate the influence of rotational speed and pre-load of the bearing on distribution and level of temperature. Obtained simulation results will be verified on the experimental stand.

The investigation of microstructure and hardness of archaeological alloys

Konieczny J., Kondziołka Ł., Młodkowska-Przepiórkowska I.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 49, nr 2

166--179

Purpose: The aim of the work was to investigate the microstructure and hardness of archaeological metal. Design/methodology/approach: The investigations of the microstructure were made on ZEISS SUPRA 25 with EDX method. Investigation of structure were made on PANalytical’s X’Pert diffractometer. Findings: Metallographic studies were carried out on archeological finds that have been extracted from the ground during excavations on the market in Czestochowa (Poland) during the summer of 2009. In addition to the remains of buildings discovered under the level of market research objects were excavated in the area. Preliminary dating of the material shows a broad interval. Research limitations/implications: In the examined finds the main component is copper, but they also contain other elements, sometimes in large numbers, that indicates a very low-purity metallurgical material and thus proves that this is not a typical bronze how manufactured at that time. The metal nails are characterized by high purity metallurgical. Practical implications: The presented results are an important contribution to the accurate characterization of found objects and also can help to determine more accurately determine their age and use in daily life of ancestors. Originality/value: These factors indicate new areas of research in materials science that significantly enrich the knowledge of times past.