Slavomir Hrcek

Slavomir Hrcek
University of Žilina · Department of Design and Mechanical Elements

About

41
Publications
17,057
Reads
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171
Citations
Additional affiliations
September 2004 - present
University of Žilina
Position
  • Head of Department

Publications

Publications (41)
Article
Increasing the durability of machines and equipment is very desirable today. It mainly applies for special and economically expensive applications. This can be achieved by new design of its parts. The aim of this research is to increase the durability of curved bodies with line contact by changing their shape. The durability of a rolling element wi...
Article
Full-text available
Driver fatigue can be manifested by various highly dangerous direct and indirect symptoms, for example, inattention or lack of concentration. The aim of the study was to compare the behavior of young drivers, older drivers and professional drivers, particularly in situations where they feel fatigued. In the online questionnaire, drivers answered va...
Article
Full-text available
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
The aim of the work was to characterize the maintenance of internal combustion engines of diesel multiple units of the 812 series, to process an overview of operational failures, to define methods and procedures for the identification of their actual technical condition. The first chapters are a summary of the prescribed procedures and methods for...
Article
Full-text available
In the automotive industry, automated production and assembly lines are now used for the production of individual components. In particular, specialized single-purpose machines can incredibly shorten production or assembly time. This article deals with the design of a single-purpose device that is used for automated assembly of a roller bush with a...
Article
Full-text available
Automated production and assembly lines can be considered a crucial factor in accelerating the production processes and achieving the maximum financial savings. In particular, specialized single-purpose machines can significantly reduce production or assembly time. The submitted article presents a design of a single-purpose device that is used for...
Article
Full-text available
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
Full-text available
In this paper the authors introduce results from the field of the fatigue safety of selected steels in the region of ultra - high number of loading cycles. The fatigue tests were carried out at high frequency tension - compression loading (f = 20 kHz, T = 20 ± 5°, R = -1) in the region from N = 106 to N = 109 cycles. The fatigue safety coefficients...
Article
Full-text available
This article deals with an optimisation procedure of inner geometry of rolling elements designed for spherical roller bearings. A process of selection of the most appropriate solution to increase spherical roller bearing durability is understood under the term optimisation in this case. The aim of this article is to examine the impact of a change o...
Book
This conference proceeding presents contributions to the 59th International Conference of Machine Design (ICMD 2018), organized by the University of Žilina, Faculty of Mechanical Engineering, Department of Design and Mechanical Elements. Discussing innovative solutions applied in engineering, the latest research and developments, and guidance on im...
Article
Full-text available
The paper deals with creation of functional parametric 3D model of slewing bearing. The slewing bearing is loaded by the radial force that acts from the centre of the bearing and it is also perpendicular to the axis of bearing. 3D fully parametric model of slewing ring was designed in Creo Parametric 3 and it is controlled by the ball diameter. To...
Article
Full-text available
The wear of rails and wheels is important problem in rail traffic. The change of the shape of the wheel profile has not only a great influence on the dynamic properties of the vehicle (like stability, safety by passing curved tracks, etc.), but also affects the ride comfort of passengers and environmental insults, in extreme cases it can cause rail...
Article
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The thesis deals with the creation of a 3D model of the slewing bearing and its functional parts on which the axial load acts. In order to investigate the load applied to the bearing as a whole and to examine the effect of forces on the rolling body and the rolling tracks, it was necessary to create a computational 3D model with computational finit...
Article
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This article deals with the arrangement stiffness of the roller bearings with the line contact in the bearing units with regard to their durability. It analyses stationary and flanged standardized bearing units with the roller bearing using finite-element analysis. The article describes Hertz, Lundberg, Palmgren and Stribeck theories and published...
Article
Full-text available
The article deals with analysing the stiffness of a special type of bearings called slewing bearings. The purpose of the analysis is to examine the stiffness of the bearing steel. This type of bearings is most often designed for operation in which the rolling elements and hence the rings themselves are loaded in the axial direction. However, the ai...
Article
Full-text available
The article deals with a description of a mathematical algorithm, programmed in the MATLAB environment of the company MathWorks. The algorithm serves a calculation of an optimal axial preload of rolling bearings. So that, the life of a bearing pair, arranged into "X" or "O" arrangement, is maximized according to a given load. Hence angular contact...
Article
Advances in engineering solutions in recent few decades caused that conventional fatigue limit (for steels and cast irons given for number of 107 cycles) is no more sufficient. Construction parts of newly introduced transport vehicles, operating at high velocities and at long distances, reach during their lifetime very high numbers of loading cycle...
Article
Full-text available
This paper presents the layout of the about-ground weighbridge. There is requirement on the implementation of this device in order to re-measure the weight of the vehicles used for transportation of the steel waste collected to the collecting yard. The weighbridge is used wherever the vehicles must be weighed in order to not exceed the maximum perm...
Article
Full-text available
The need to optimize the design of the structural node or the entire technical system returns the structural design or the whole production documentation back to the engineer's drawing board. Incentives to changes may occur in another lifecycle phase of the technical system. If a need to optimize arises, the engineer has more methods to choose from...
Article
Full-text available
The article deals with a design of a unified device intended for loading of outer bearing rings into specific types of grinding machines. It contains description of loading devices and analysis of a grinding technology. The main body of article consist of a proposal of series of solutions, their evaluation based on their technical values as well as...
Article
The von Karman large deformations are considered in the Mindlin plate theory described by the nonlocal and gradient elasticity for piezoelectric nanoplates. It is shown that electric intensity vector can be expressed by mechanical quantities. The governing equations for bending moments, normal and shear stresses are derived from the variational pri...
Article
Full-text available
In the field of engineering relatively new designs and manufacturing processes are constantly emerging. These changes are often seen in designing and manufacturing of prototypes or in single part production. We decided to analyse an aircraft propeller prototype using modern technologies. Existing aircraft blade design was converted to digital model...
Article
The strain gradient magnetoelectroelasticity is applied to solve two-dimensional boundary value problems. The electric and magnetic field-strain gradient coupling is considered in constitutive equations. The meshless local Petrov- Galerkin (MLPG) is developed to solve general problems. All field quantities are approximated by the moving leastsquare...
Article
Full-text available
The objective of this paper is to describe the procedure of correct determination of the optimum preload of tapered roller bearings in terms of their fatigue life, using the procedure laid down in ISO 281, and by analysis of contact stress state (analytically and by the FEM) with application of the Lundberg-Palmgren theory. The procedures will be a...
Chapter
This article highlights the possibility of including the effect of fits on the accurate calculation of the fatigue life of rolling bearings and limits of ISO 281, which provides the calculation of service life for over 60 years.
Chapter
This article discusses the effect of fits stiffness on distribution of internal loading in rolling bearings. Investigating effect of stiffness was performed by using the finite element method, because with the analytic method, this effect is impossible to include in the load distribution calculations on body parts, which transmit load in rolling be...
Article
In this paper, the symmetric Galerkin boundary element method (SGBEM) will be developed and applied for boundary value problems with layered and fiber reinforced piezoelectric representative volume elements (RVE) and real macroscopic structures. Mechanical and electric loadings are considered to determine the effective material properties. For this...
Article
A meshless method based on the local Petrov-Galerkin approach is proposed to analyze bending of a porous piezoelectric cylinder under thermal loading. Constitutive equations for porous piezoelectric materials possess a coupling between mechanical displacements and electric intensity vectors for solid and fluid phases. The influence of thermal expan...
Article
The stress intensity factor and electric displacement intensity factor for cracks in conducting and non-conducting piezoelectric materials is investigated. Transient dynamic crack problems are analyzed. The coupled governing partial differential equations (PDE) for stresses, electric displacement field and electric current are satisfied in a local...
Article
Full-text available
The aim of this paper is to detail the creation of a large tapered 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...
Chapter
This article deals with temperature stabilization within the electronic system protective housing of the Plasmabit device, employed in ultra-deep geothermal wells. Device description, boundary conditions of geothermal wells and simulation results are also presented. Simulations have been carried out using finite element method (FEM) approach.
Conference Paper
The aim of this paper is to detail the creation of a large tapered 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...
Article
Full-text available
Ultra-high cycle fatigue of structural materials has been an extensively investigated phenomenon in the last thirty years. Nevertheless, the fact that there is no infinite fatigue life of metallic materials has not been considered in structural design very often. This paper presents the results of 50CrMo4 low alloy steel fatigue tests in the high a...
Article
Full-text available
This paper deals with accurate geometric models of rolling bearing components in the CAD system. This model is then employed to create a static structural analysis used to determine the size of stress between the components of a rolling bearing. Following the stress analysis, we specify the maximum load of a rolling bearing with regards to durabili...
Article
Full-text available
The aim of this paper is to detail the creation of a roller bearing model in the Adams program suite for subsequent dynamic analysis and to obtain information about different parts of the bearing during the simulation. The bearing model was made so as to closely resemble its reallife counterpart, which allows us to estimate load conditions, dynamic...
Article
Full-text available
This article details the design of an apparatus used in service life testing of large-scale rolling bearings on Faculty of Mechanical Engineering at University of Žilina. It describes individual steps in the design process, used parts and methods employed throughout the design process. One chapter is devoted to measurement techniques used in servic...
Article
This article discusses steps towards the design, construction and production of a device used for lifetime assessment of large-scale bearings. The machine is reviewed as a mechatronic entity, comprised of three parts - mechanical, electro technical and hydraulic. The mechanical part was designed with the help of modern CAD/CAE/PDM design systems al...
Article
Full-text available
Paper industry deals with procedures for conceptual and final design of a machine Intended for unwinding paper that remains on reels during a certain phase of paper producing. Design procedure of the machine is a subject of this paper. The machine was designed as a mechatronic unit consisting of a mechanical part, an electric part and a pneumatic p...

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