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EN
Reliability and maintenance analysis of hydraulic positive machines basicly focused on the processes of their wear and failure. But in order to correctly assess the mechanical and volumetric efficiency of a hydraulic motor, both at the stage of development research or at the stage of control tests during its exploitation, the working volume of this motor must be correctly determined. Therefore this paper proposes a new method of assessment of the size of the working volume of a hydraulic motor. It has been shown that the hydraulic motor absorbency per one revolution of this motor shaft is a non-linear function of pressure drop in working mechanism of the motor and non-linear function of motor rotational speed. Thus the relation between the working volume of a hydraulic motor and the pressure drop in the motor working mechanism is a non-linear function. This working volume as a funcition of pressure drop has been called the actual working volume. The correctness of the proposed method was confirmed experimentally.
EN
This paper describes investigation on the influence of hydraulic oil temperature on the performance of a hydraulic pump. The aim of the research is to determine changes in volumetric efficiency of the pump in the form of maps of operation at different temperatures of the hydraulic oil, in conditions of variable speed and pressure. The described tests were carried out on an experimental stand with a hydraulic fixed-displacement gear pump controlled by a servo motor. Based on the signals from the sensors processed with the LabVIEW program, maps of the hydraulic pump operation were drown in a wide range of speeds and temperatures. The paper presents the results of the research and based on this the conclusions regarding the main aim of the research and others that were observed during the measurements were presented. The most important conclusion from the study shows that the temperature-dependent characteristics provide users with a significant amount of information such as operating conditions that will ensure a high level of efficiency.
PL
W pracy przedstawiono wyniki badań dotyczących oceny zdolności skrawnych ściernic supertwardych kształtowanych w procesie elektroerozyjnego obciągania elektrodą stacjonarną, wirującą i segmentową. Do oceny zdolności skrawnych ściernic posłużono się metodą szlifowania wzorca zewnętrznego, na podstawie której określono temperaturę i wydajność względną szlifowania wzorca.
EN
In the paper investigation results concerning assessment of cutting abilities of superhard grinding wheels shaping after electrodischarge dressing process using stationary, rotating and segmental tool electrodes have been presented. For assessment of cutting abilities of grinding wheels the method of grinding of outer standard has been applied. Basing on this method the temperature and relative efficiency of grinding has been determined.
PL
Optymalizacja pompy zębatej wymaga obliczenia sprawności objętościowej, hydrauliczno-mechanicznej oraz całkowitej. Ze względu na konflikt modelowy często oblicza się bezpośrednio sprawność całkowitą przy założeniu spełnienia dopuszczalnego pozostałych sprawności. Nakładkowe drzewa logiczne są dodatkową niezależną metodą.
EN
Optimization of the gear pump requires calculations of volumetric, mechanical and total efficiencies. Because of the model conflict, total efficiency is often calculated on the assumption that the other efficiencies are acceptable. Multiple-dimensional logical trees are the additional independent method.
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