Barrel engines are characterized by unconventional construction feature: cylinder axes are parallel to drive shaft axis. The rotation of the central power shaft is created from the reciprocating motion of the pistons with the use of different types of mechanisms, including wobble plate, swash plate or cam disc. Due to complex internal motion their kinematics and dynamics is completely different than that of crankshaft engine. Barrel engines are expected to have a potential to compete with currently used power units, especially in aircraft applications. The paper reviews and compares all classified types of barrel engines with conventional crankshaft engine in terms of kinematics: mechanical losses and mechanicals efficiency. Advanced computations were made for each mechanism to derive formulas describing 3 dimensional movements of barrel engines' parts. Comparison of mechanisms parameters was made with the use of MatLab software. The paper gives a brief idea of barrel engines classification and design. Computations methodology for mathematical description of all mechanisms' kinematics is presented as well as the results of mechanical losses and efficiency comparison. Wobble plate mechanism blocked by gear has been identified as the most promising for further analysis and research.
W artykule omówiono możliwości wykorzystania wyników pomiarów ciśnień indykowanych do wyznaczania średniego ciśnienia indykowanego silników tłokowych. Traktując tłokowy silnik spalinowy jako uogólniony węzeł tarcia, straty mechaniczne silnika odzwierciedlają jego stan techniczny. Wyznaczenie średniego ciśnienia indykowanego silnika na biegu jałowym będącego w istocie średnim ciśnieniem strat mechanicznych pozwala sformułować diagnozę o stanie technicznym układu tłok - pierścienie tłokowe - tuleja cylindrowa oraz o łożyskowaniu silnika. Jednak, aby diagnoza była wiarygodna konieczne jest przedstawienie średniego ciśnienia strat mechanicznych jako funkcji lepkości oleju smarowego. Zaprezentowano także wyniki badań diagnostycznych wybranych silników okrętowych eksploatowanych na okrętach Marynarki Wojennej RP.
EN
Possibilities of indicated pressure measurements using to asses mean indicated pressure of RIC engines has been presented in this paper. Looking at the RIC engine as a generalized friction centre, we could say that mechanical losses may be used as a tool to asses its technical condition. Mean indicated pressure on idle speed is as a fact equal to mean pressure of a mechanical losses and it is enough to make diagnosis about technical state of the engine cylinder-piston groups and bearings. But to make the diagnosis more accurate it is necessary to analyze mean pressure of mechanical losses as a function of lubricating oil viscosity. Some results taken from measurements made on Polish Navy ships are also presented in the paper.
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