Michal Lukac

Michal Lukac
University of Žilina · Department of Design and Mechanical Elements

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31
Publications
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118
Citations
Introduction
Skills and Expertise

Publications

Publications (31)
Article
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This paper is focused on the theoretical study of heat conduction in the multi-brake system of the automated guided vehicle (AGV). The study aims to compare the amount of heat generated during braking from 10 m/s until a stop in a brake system based on organic and ceramic friction material. The theoretical study of heat conduction is solved in Matl...
Article
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The aim of the presented study was to perform a global sensitivity analysis of various design parameters affecting the lost motion of the harmonic drive. A detailed virtual model of a harmonic drive was developed, including the wave generator, the flexible ball bearing, the flexible spline and the circular spline. Finite element analyses were perfo...
Article
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This article describes the design of a smart steering wheel intended for use in unobtrusive health and drowsiness monitoring. The aging population, cardiovascular disease, personalized medicine, and driver fatigue were significant motivations for developing a monitoring platform in cars because people spent much time in cars. The purpose was to cre...
Article
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The main objective of this article is to analyse the structural design of tire lifting equipment for tire services. To gain a better insight into the problem, several steps must be taken. The first step is to conduct a market analysis, which involves identifying all available equipment. Several types of lifting devices were distinguished within the...
Article
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The paper aims to classify the maintenance of internal combustion engines in 812 series diesel multiple units, to analyse operating failures, and to identify methods and procedures for determining their current mechanical condition. The paper specifies the required procedures and methods for maintenance starting from the development of the DMU (die...
Article
The aim of the presented study was to perform the strip test of 0.5 mm thick molybdenum strip specimens by various simulated drawbead heights from 2 mm up to 6 mm and various temperatures from 20°C up to 320°C to obtain friction coefficients between the molybdenum strip and steel cylinders built-in the developed test device simulating the drawbead....
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This article presents a model of the geometry of teeth profiles based on the path of contact definition. The basic principles of the involute and convex-concave teeth profile generation are described. Due to the more difficult manufacturing of the convex-concave gear profile in comparison to the involute one, an application example was defined that...
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This paper provides view of current trends in the field of testing and numerical analysis of dynamic loading structures. It describes what is the role of structure dynamic characteristic analysis in the management of the structures construction and maintenance in power plant industry. The main objective of this study is the dynamic analysis of powe...
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An analysis of a conventional gear wheel shot with MPK methodology has been processed by many authors before. Harmonic gearbox systems are composed of rigid and flexible parts through which the torque is transmitted, thus generating power. The contact pressure is specifically distributed through more teeth whilst against conventional gearbox system...
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Cycloidal (also called epicyclical or convex-concave) gears are used less often than common involute gears, which are very easy to manufacture and can be modified by corrections to the gear profile. Cycloidal gears are very sensitive to the proper axial distance between the pinion and the gear. The main advantage of convex-concave gears is the lowe...
Article
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This article is about design and calculation of planetary gearbox which can be used in transport applications. The gearbox is designed with respect to the input parameters. The gearbox has two planetary gears. The model of gearbox is created in Simscape Driveline software containing blocks which represent the key components of the gearbox. There is...
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This article presents a brief overview of weighing systems and devices designed to facilitate fluent and safe road traffic. The number of vehicles on roads is perpetually on the rise, resulting in increased wear of road surfaces. This is why weight check gates have widely been implemented to check the speed and weight of a vehicle against what is p...
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The article presents the possibilities of an integrated transport system modeling simulating the complexity of regional transportation and its effects. The modeling methods deal with individual behavioral units and proceed through several steps to estimate travel.
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The paper presents the construction of a device that allows processing the Baosteel/Sanchez experiment. The experiment simulates the brake ribs by deep drawing of the molybdenum sheet metal.
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This article is about calculation of planetary gearbox. The gearbox consists of two planetary gears - input and output. The gearbox model is created in Simscape Driveline. The model contains Simscape blocks which represent a gear box, clutch, ideal torque source and many others blocks. At the end we compare our results of simulation with calculatio...
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Physical modelling of transportation system is helpful for finding information about the power flow in particular transmission elements. The vehicle power train model can be built from predefined blocks. The blocks are based on mathematical equations, which define every power train element. The procedure of the particular transmission element - a t...
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The aim of this paper is to detail the creation of a roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life...
Article
The article covers the usability of alternative materials in vehicle construction. The paper elaborates upon the setup of the process and analysis of the results of the carbon composite component FEM model. The 3D model, used for the examination, is a part of axle from an alternative small electric vehicle. The analysis was conducted with the help...
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The aim of the presented article is to show the possibilities of vehicle tire mathematical model creation and present simulations of a typical driving manoeuvre of a vehicle model equipped with variant tire models.
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This article presents an unconventional principle of the vehicle power flow transmission, different from the commonly used powertrains. Presented powertrain consists of a combined hydro-mechanical transmission with hydrostatic units and torque converter in parallel lines with mechanical components providing the continuous gear ratio change.
Article
This article presents an unconventional principle of the vehicle power flow transmission, different from the commonly used powertrains. Presented powertrain consists of a combined hydro-mechanical transmission with hydrostatic units and torque converter in parallel lines with mechanical components providing the continuous gear ratio change.
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The simulation of a road vehicle requires also the model of a mechanical differential. This article describes one of the possibilities how to build a mechanical differential model by the selected vehicle model structure.
Article
The paper describes an analysis of suitability of a tire model and its model properties with respect to values of the car body acceleration, or running stability of the vehicle. In the frame of the solution simulations were run on a modified example model of a vehicle from the library of ADAMS/Car. The monitored dynamic parameters were a function o...
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The aim of the presented article is to show how to create a mathematical model of the tension mechanism working by a spring motion generation and contacting a rigid body at the end of the motion.
Article
In this work, a dual porosity model of reactive solute transport in porous media is presented. This model consists of a nonlinear-degenerate advection–diffusion equation including equilibrium adsorption to the reaction combined with a first-order equation for the non-equilibrium adsorption interaction processes. The numerical scheme for solving thi...
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This contribution describes some tests of hydromechanical infinitely variable transmission (IVT) on a test stand. Further, there is described a truck with installed IVT and tests of this IVT at real conditions. There is also shown a control system of the IVT.
Article
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At present, hydromechanical transmissions are used especially in agricultural and defence vehicles. These transmissions have potential to be used also in other vehicles, for example commercial cars and buses. Differential hydromechanical transmission generation needs to achieve comparable parameters in comparison with the competition to prove maxim...
Article
In contribution authors describe a device, which verifies parameters of brake test benches at the Vehicle Testing Stations (VTS) and at the service stations. The system will verify the properties of the brake test benches in the dynamic braking state.

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