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Balancing of 3-cylinder Tractor Engine
Přeslička, Jaroslav ; Hrdlička, Zdeněk (referee) ; Dundálek, Radim (advisor)
The thesis deals with analysis of balancing of given cranktrain. At the introductory part is solved kinematics of the crank mechanism. Another part of the text occupies with dynamics of the crank mechanism and eventuality of its balancing with using of point-mass model. This simplified model is utilized for analytic solution of given mechanism. Results of analytic solution are compared with results of MBS solution. At the last part is done analysis of minimal distance between the selected parts of the mechanism. Then simple optimization of balancing is done. At the end is considered balancing of the mechanism and simple improvement is proposed, considered are results of minimal distance analysis too.
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Cranktrain with High Mechanical Efficiency
Krajči, Jakub ; Raffai, Peter (referee) ; Novotný, Pavel (advisor)
This master's thesis is concerned with the mechanical efficiency of cranktrain contact pairs in a combustion engine. In the introductory part, the fundamental terminology relating to the cranktrain is presented along with the specification of the areas of mechanical losses, greasing modes and types of wear. The following chapters describe the possibilities of eliminating mechanical losses of the cranktrain and the calculation methods that can be utilized to mathematically solve mechanical losses. The practical part includes the proposal of a calculation model and its use in the analysis of the cranktrain of Skoda 1.2 HTP engine. The last part of this thesis comprises modified alternatives of the standard cranktrain focusing on the elimination of mechanical losses. The evaluation of the results is presented in the conclusion of this thesis.
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Shape Optimalisation of Aircraft Engine Crankshaft
Vopařil, Jan ; Drápal, Lubomír (referee) ; Novotný, Pavel (advisor)
This thesis describes the variety and the width of issues connected with crankshafts of combustion engines. It distinguishes different factors, which influence the shape and size of these crankshafts and the selected findings are then transferred into the design of crankshaft for the particular engine. The thesis also presents coherent description of application of topology optimization to the particular crankshaft and also different, more complex design procedures leading to the optimal shape of crankshaft are afterwards suggested. Quality of such a design is then verified by comparative analysis of fatigue of the crankshaft.
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Eccentric Cranktrain
Kóňa, Marián ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
This thesis is focused on design of four-stroke engine eccentric cranktrain. The thesis includes kinematic analysis of mechanism. The main attention is paid to examination of dynamic variables which burden piston skirt. Result of the thesis is designed eccentricity value of mechanism to reduce piston skirt stress.
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General Solution of Cranktrain Mechanical Losses
Honc, Robert ; Píštěk, Václav (referee) ; Novotný, Pavel (advisor)
Master’s thesis deals with the description of cranktrain friction and presents and describes experimental cranktrain friction loss evaluations and computational cranktrain friction loss evaluations. The main problem is the creating software solution of selected computational friction loss evaluations that leads to calculation of cranktrain friction losses. Master’s thesis describes chosen computational friction loss methods and the subsequent creation of the software solution. After application on chosen internal combustion engine, it evaluates the results and draws conclusions about functionality of the software solution.
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Radial Slide Bearing Analysis Using Advanced Computational Methods
Orbán, Tomáš ; Dlugoš, Jozef (referee) ; Novotný, Pavel (advisor)
This master’s thesis introduces a slide bearing analysis using the MBS software tool of FEV Virtual Engine, including real surface topography based on 3D roughness measurements. The first half of the thesis gives a brief overview about gasoline combustion engines, slide bearing usage in engines, slide bearing construction and about essential approaches for the characterization of elasto-hydrodynamic behavior. In the second half, the process of model building, rough surface measurement and preparation of analyses are described. At the end of this thesis, the results of the analyses are shown and discussed.
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Silicone torsional vibration damper for a six-cylinder diesel engine
Kovář, Lukáš ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this thesis is to design crankshaft for in-line six-cylinder diesel engine and to design viscous torsional vibration damper for the cranktrain of specified parameters. The thesis includes the creation of a dynamic torsional model of cranktrain and calculation of forced vibrations of mechanism with and without damper. Part of this thesis is also strength analysis of the designed crankshaft with damper using the Finite Element Method (FEM).
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Modal Properties of 6-cylinder Tractor Engine Powertrain
Poláček, Milan ; Píštěk, Václav (referee) ; Dundálek, Radim (advisor)
Tato diplomová práce uvádí dynamiku klikového mechanismu šestiválcového řadového motoru za účelem návrhu klikového hřídele v CAD programu Pro/Engineer. Následuje popis vibrací klikového mechanismu a analytický výpočet jeho torzních vibrací. Hlavní část diplomové práce se pak zabývá konverzí hřídele do konečno-prvkového modelu v programu ANSYS a jeho importem do prostředí Adams/Engine. V tom je provedena modální analýza klikového ústrojí pro získání vlastních frekvencí a tvarů. Na konec práce je porovnán výstup z analytického řešení a výsledky z multi-body systému.
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Reduction of cranktrain mechanical losses
Lhota, Martin ; Píštěk, Václav (referee) ; Novotný, Pavel (advisor)
The aim of the bachelor thesis Reduction of cranktrain mechanical losses is to describe the issue of lowering mechanical losses occuring in the crank mechanism of internal-combustion engine. Therefore it aims to create a list of mechanical losses main sources, to show suitable methods to determine them, and to describe some of earlier used concepts leading to reduction of friction losses. Further, it is focused on the description and comparison of existing trends by which the given problem can be solved to a certain extent. The thesis also tries to evaluate these trends by an analysis following the standpoint of effectiveness and progressiveness, and to formulate a conclusion.
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