Žilinská univerzita v Žiline

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    Eigenanalysis of a valvetrain simplified model of a combustion engine with 3DOF
    (University of Žilina, 2025) Dižo, Ján; Blatnický, Miroslav; Dziubak, Tadeusz
    A valvetrain is a necessary structural unit of every combustion engine with discontinued combustion process. It ensures changing cylinder filling, allow low level of exhaust emissions and an optimal combustion process. There are several types of valvetrains depending on their design solution. In principle, there are recognized older valvetrain systems marked as OHV (overhead valve engine) and OHC (overhead camshaft engine). Regardless of a type of valvetrain, they include several components, which are in mutual connection. As they are exposed to dynamic effect during operational conditions, they should have suitable dynamical properties. A valvetrain is a mechanical system. The essential dynamical properties of a mechanical system of a valvetrain of a combustion engine include eigenfrequencies and eigenmodes. The article is focused on eigen analysis of a valvetrain of a combustion engine. Equations of motion of a simplified dynamical model of a valvetrain are derived. Eigen characteristics of a chosen type of a valvetrain are calculated. Matlab software and Simpack multibody software were used for calculation of the derived equations.
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    PROGRESÍVNE RIEŠENIA OVLÁDANIA ROZVODOVÝCH MECHANIZMOV PRE LETECKÉ PIESTOVÉ MOTORY
    (Žilinská univerzita v Žiline, 2020) Horák, Tomáš; Čerňan, Jozef
    The timing mechanism and its control represents the major part of this final thesis. In line with the latest requirements, efforts to discover a new solution that could improve certain parameters of the piston engines might have been marked as the main motivation behind the thesis. The initial part describes the actual piston engine, its operation principles and gradually follows to the timing mechanism. In this way, the reader acquires the knowledge necessary for a better understanding of the following chapters. We have described and compared individual options for controlling the timing mechanisms, which could be found in today´s piston engine. The main idea of this thesis was to analyse the progressive solutions of the control timing mechanisms. Further to that we analyse some specific solutions regarding operation and design, which could be potentially implemented in the aviation industry. Concluding part of the thesis includes, besides others, a pros & cons analysis of the system. Following that we also expressed our idea of how this system could be employed in the aircraft engines. On the one hand, we introduced a positive impact of such implication, but on the other hand, we identified a space for potential improvement.