Technológ

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Vychádza spravidla dvakrát ročne. Publikuje vedecké, výskumné, odborné, teoretické práce, návody, štúdie, recenzie, informácie o spracovaní technických materiálov. Zameriava sa na uverejňovanie príspevkov a prác venujúcich sa otázkam z oblasti trieskových a beztrieskových technológií, fyzikálnych princípov, nekonvenčných technológií, technologickosti konštrukcií nástrojov, ekonomike výrobného procesu, ekologizácii, spracovaniu odpadov. Takisto publikuje práce o strojoch, nástrojoch, prípravkoch a meracej technike pre oblasť mechanických technológií, výsledkoch výskumu vo sfére informačných technológií v technologickej oblasti. Uverejňuje práce o histórii a vývine mechanických technológií. Časopis zverejňuje príspevky v jazykoch: slovenskom, českom, poľskom, ruskom, anglickom a nemeckom.

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Author: search.filters.author.Blatnický, MiroslavSubject: search.filters.subject.equations of motion

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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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    Hodnotenie pohodlia jazdy v osobnom vagóne prostredníctvom rovinného dynamického modelu pri zvislom kmitaní
    (University of Žilina, 2024) Dižo, Ján; Lovska, Alyona; Blatnický, Miroslav; Ishchuk, Vadym
    The presented research is focused on a derivation of a mathematical model of a passenger wagon based on a dynamical model in a plane with three degrees of freedom. Vertical oscillation of a passenger wagon is calculated in two different software, namely Matlab and Simpack. It is considered that three degrees of freedom are defined as following: a vertical deflection of a front bogie frame, a vertical deflection of a rear bogie frame (in a running direction) and a vertical deflection of a wagon body. The Lagrange’s equations of the second kind method is used for a derivation of the equations of motion, i.e. for a derivation of a mathematical model of wagon oscillation. Subsequently, the derived equations of motion are solved in the Matlab software as well as in the Simpack software. Both software apply calculation in a time domain. Evaluation of the results is focused on an investigation of ride comfort for passengers. This ride comfort is expressed by the NMV index calculated in five points on a wagon body floor. These calculations come from the formulation defined in the corresponding standard. The results of the NMV indices are presented in the bar graphs based on the numerical values of the NMV indices.
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