bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation model for evaluation of ergonomic load in the use of exoskeletons
Authors: Onofrejová D , Balážiková M 
Published: November 2021

Abstract
For the analysis of musculoskeletal workload and associated potential hazardous working conditions as well as musculoskeletal symptoms in worker populations among various occupations different approaches are taken, and extensive data collection studies are being accomplished. Questions are targeted on musculoskeletal workload and associated potentially hazardous working conditions can be categorized into seven indices (force, dynamic and static load, repetitive load, climatic factors, vibration and ergonomic environmental factors). Evaluation focus on standing, sitting, walking and uncomfortable postures, the indices constitute a brief overview of the main findings on musculoskeletal workload and associated potentially hazardous working conditions. The validity of the findings is fair when compared with an index of psychosocial working conditions and discomfort during exposure to physical loads. Worker groups with contrasting musculoskeletal loads can be differentiated on the basis of the indices and other factors. It appears that most indices and factors show significant associations with low back and/or neck-shoulder symptoms. This simulation model NIOSH analysis can be used as a simple and quick approach to identify worker groups in which a more thorough ergonomic analysis indicates possible improvements in load factor using particular exoskeletons at work.
Study vibration of worm gear boxes
Authors: Šmeringaiová A 
Published: November 2021

Abstract
The article describes the method of experimental analysis of transmission mechanisms. The test station enables to test different types of gears and to simulate their different operating conditions close to reality. The tests may be short-term and long-term. The course and results of the test operation of the screw reducer are described. Measured and evaluated were low-frequency and high-frequency vibration, temperature and wear functional parts of the teeth.
The use of digital filtration methods in AGV laser navigation systems
Authors: Dobrzanski P , Dobrzanska M 
Published: November 2021

Abstract
Recognition of the surroundings of automated guided vehicles (AGV) is one of the basic factors ensuring their proper movement in the field. The aim of the article is to present the use of a laser scanner to locate the position of objects in the vehicle's surroundings as well as to present the results of simulation of the analyzed methods of filtering the measurement results.
Modeling the damages of belt gears
Authors: Elżbieta Gawrońska , Grzegorz Domek , Piotr Krawiec , Andrzej Kołodziej 
Published: November 2021

AbstractThis paper looks into the problem of choosing a driving belt for a drive. The previously developed selection of algorithms was subjected to another evaluation that helped us recognize the need for changes indicated in developing new designs of drive belts. The new algorithm will be tested by simulating the operating conditions of the transmission, to which the right belt must be selected. Damage assessment after operation and belt selection allows for the identification of a new coupling model. By presenting the relationship between specific failure cases and the parameters of the coupling model, we can see the functionality of the selection algorithm. There may be multiple belt transmission damages. The feed may be broken; the surface may be damaged; the same applies to the edges. Furthermore, the wheels and bearings may be damaged too. The belt can have many additional functions that affect its operating parameters. Next to the drive function, the belt often performs conveyor and control functions. Thus, additional types of damage occur in belts with additional functions. The number of causes of their occurrence is also growing. For example, any damage to the sling in the passenger elevator can endanger the life of the passengers. Intensive research is being carried out on the real-mode damage monitoring systems. Specific failures are being monitored, and appropriate systems are being designed for them. Therefore, it is important to investigate the damages to belt transmissions, modeling their course of progression and causes.
Constructional design of the body shape of large gear wheels
Authors: Sivák S , Maláková S 
Published: November 2021

Abstract
The development of modern machines and means of production is characterized by ever-increasing performance parameters with decreasing equipment weight. When designing large gears, it is also necessary to consider the influence of the body shape of the gear wheel. The body shape of gear wheel must meet the basic requirements of stiffness and strength with the lightest possible construction of the gear wheel body. The work is focused on large gears, made with relief. Such gears can be forged, cast, or made by welding. The shape of the gear wheel body depends on several factors such as the size of the wheel, the material, the method of manufacture or use. The paper provides an overview of the body shapes used by large spur gears. These body shapes of spur gears will be the subject of further research, where suitability will be assessed based on stiffness of teeth and wheel weight.
Elastic modulus of defected graphene sheets
Authors: Bocko J , Lengvarský P 
Published: November 2021

Abstract
In this paper, the elastic modulus of single-layered graphene sheets (SLGSs) with and without defects is investigated using the finite element method. The SLGSs with two chiralities (armchair and zigzag) are modeled by beam elements. At first, the SLGSs without defects are investigated then the carbon atoms and corresponding beam elements are removed and the elastic modulus of SLGSs is determined. The increasing number of defects apparently decreased the elastic modulus of graphene sheets.
SMART Identification by Vision System
Authors: Demčák J , Husár J , Hladký V 
Published: November 2021

Abstract
The paper describes a machine vision system for SMART identification of objects. In the introduction, this system is analyzed from a theoretical point of view. Advantages and possibilities of its use are emphasized. The following section presents our research workplace, where the machine vision is located. It involves two identification stations, one of them with 3D measurement and the second is a 2D multi-spectrum with several types of lighting. One part of this section describes the workplace in 2D view and equipment of vision system situated in this laboratory. The third part examines the possibilities of character identification by this system. The novelty of the paper is presented experiment with different wavelengths of light (RGB, UV, AM, W, infrared, far-red). The result of experiment is the most suitable light for characters identification by vision system.
Multibody system simulation as a predictive tool for possible estimation of negative effects caused by vibrations of FDM device
Authors: Kaščak J , Kočiško M , Knapčíková L , Coranič T , Tôrôk J 
Published: November 2021

Abstract
The design of fused deposition modeling (FDM) devices in their current form is associated with many negative effects, which result mainly from their construction deficiency. Due to the constant effort to increase the accuracy and speed of these devices, we often encounter the emergence of various negative factors. One of the most significant factors is the presence of negative vibrations of the frame and individual components. These are directly linked to several shortcomings that FDM devices come with. Efforts to make the structures as simple as possible, their low weight or the use of filament extruders placed directly on the printheads and axis travels, are perceived as well-known shortcomings. These negative phenomena are subsequently manifested by the emergence of specific defects visible on the surface of the manufactured models. The article presents the possibility of predicting the occurrence of these negative phenomena, with the use of multibody simulation. This simulation analyzes the movements of a specific device at different print speeds. The article then presents the results of these simulations and analysis of the transmission of negative oscillations at specific critical points of the FDM device. Finally, the article examines the influence of possible regulation of devices acceleration rates caused by electrical motors in individual axes and their influence on the final surface quality of the manufactured model. The article points out the possibilities of using this type of simulation processes and analysis in the design process of new types of frames and translation mechanisms for FDM devices.
Virtual reality and its possible integration into the process of distance learning focused on technically oriented subjects
Authors: Franas E , Kočiško M , Kaščak J , Hlavatá S , Vodilka A 
Published: November 2021

Abstract
Individual digital technologies which are aimed at simulation of real world elements are currently one of the most promising areas of interest. The growing popularity of the augmented, virtual reality technologies, as well as the industries in which their application has an increasing impact, is causing a sharp growth in the number of specialized software. An increasingly popular sector in which virtual and augmented reality has promising prospects in the field of education. It was this area that created space for the application of various software solutions during a pandemic situation. The application focused on the distance form of educational process, training and mediation of interactive experiences, which subsequently mitigate the teaching process, has found application not only in technically oriented areas. This article presents the possibilities for usage of the virtual environment created in the Rinoceros software, which is used as a supporting tool for the teaching process of technically oriented subjects. The article describes how to apply and modify specialized software for a specific area of use. Particular type of VR/AR devices are used to mediate an interactive form of teaching, towards a specific group of students. Due to the intention of increased efficiency of this process, the article presents the possibilities of using the multiuser - host/guest functions, for full interactivity of more users. This solution allows the users to work with 2D, 3D models and CAD model assemblies in a virtual environment. It also presents the possibilities and promising areas of use which describe the other software features and their possible application in other areas, such as reverse engineering and intuitive modeling.
Influence of asymmetric airflow on the cooling performance of brake disc of railway vehicle
Authors: Pavelcik V , Fomina Y 
Published: November 2021

AbstractThe main objective of this article is to discuss the influence of asymmetric airflow on the cooling performance of the brake disc. This asymmetry might be caused by the air inlet pipe curvature of the UIC test bench for frictional components, whereas in reality this asymmetry might be caused by various factors. In the first part of the paper, a brief summary of effects of heat and temperature changes on the brake disc is presented. Additional information about UIC test bench is given with the focus on cooling effects of airflow on the disc. In the second part, a CFD simulation was made, and its settings and results are presented in detail. In the last part, temperature differences in various time points and positions on the brake disc are compared graphically in order to assess the influence of airflow from the inlet pipe and its curvature on the cooling performance of the brake disc.
The use of illite in function of filler applied in rubber blend
Authors: Pajtášová M , Pecušová B , Ďurišová S , Ondrušová D , Mičicová Z , Feriancová A , Brigantová S 
Published: November 2021

AbstractThe presented work was dealing with the study of the commercial filler influence change in rubber blend by an alternative filler based on the clay mineral - illite. The focus of the presented work was aimed at the study of selected curing characteristics of rubber blend with addition of clay mineral filler and physico-mechanical properties of prepared vulcanizates. Curing characteristics, the processing safety, minimum and maximum torque, optimal curing time and curing rate coefficient were determined during the curing experiment phase. Selected physico-mechanical properties were given by the determination of hardness, tensibility and tensile strength. The obtained results proved the possibility of partial commercial filler replacement by an alternative filler and the positive effect of clay mineral on resulting important properties in rubber industry.
Study of new elastomeric composite systems containing wood ash based alternative filler
Authors: Ondrušová D , Božeková S , Pajtášová M , Labaj I , Božek M , Vršková J , Skalková P 
Published: November 2021

AbstractThe presented paper deals with the preparation of the new types of elastomeric composite systems containing an alternative filler based on wood ash or fly ash. Wood ash (fly ash) is generated as the waste from the process of wood pellets burning in the pellet boilers. The results of the EDX analysis confirmed that CaO and SiO2 are the most represented components of wood ash, which contains commonly used white fillers, such as kaolin or silica. Therefore, wood ash was used as an alternative ecological filler in a function of a partial replacement for the commonly used carbon black filler in the elastomer systems. Rheological properties and cure characteristics of prepared elastomer composite systems and tensile properties of resulting vulcanizates have been studied. The prepared elastomeric systems were also subjected to a Payne effect study. The obtained results showed the degree of filler - filler interactions as well as the degree of mutual interactions between alternative filler particles and elastomeric matrix.
Curing characteristics and rheological properties of bentonite- filled rubber blends
Authors: Mičicová Z , Božeková S , Pajtášová M , Ondrušová D 
Published: November 2021

Abstract
The study deals with the examination of the rheological behaviour of rubber blends which were filled with bentonite. The filler - polymer as well as the filler - filler interactions were studied and determined from the frequency sweep and strain sweep rheological measurements. The used natural bentonite was extracted from the locality called Jelsovy Potok. The natural bentonite had a fine fraction with a particle size of 15μm a 45 μm and it was added into rubber blends as a partial replacement of commonly used filler. The rubber blends were characterised on the basis of curing characteristics (minimum torque ML, maximum torque MH, optimum time of cure t(c90), processing safety of blend ts,). Moreover, the complex viscosity and Payne effect were also specified. The required measurements were done by using PRPA 2000.
Component assembly for determination of elastomeric vulcanizate frictions
Authors: Labaj I. , Ondrušová D. , Vršková J. , Pajtášová M. , Feriancová A. 
Published: November 2021

Abstract
This article deals with the design and assembly of a component for determining the frictional properties of elastomeric vulcanizates. The component was design for a universal tensile machine, without needed of intervention to itself machine. The purpose of the work was designing a component in software SolidWorks and its subsequent assembly, as well as individual testing of frictional properties of selected specimens of elastomeric vulcanizates. Before of individual testing, the elastomer blends have to be vulcanised in the form of a block with a constant 16 mm height to ensure the same spring pressure on the specimens in the component. Then, by using rotary knife is from prepared vulcanizate cut a sample with 16 mm diameter. Result from friction properties measurement of samples is force needed to start of movement (shear) of sample over particular type of surface as well as graphical dependence of force (N) on movement of track (mm). From the graphical dependence, it is possible to determine the decrease or increase the force depending on the individual sections of the trajectory.
The influence of silane on the physico-mechanical properties of vulcanizates using bentonite fillers
Authors: Feriancová A , Dubec A , Pagáčová J , Labaj I , Pajtášová M 
Published: November 2021

Abstract
Layered phyllosilicate fillers have received attention in the polymer industry due to their unique nanoscale sheet-like structure. Adding a small amount of bentonite nanofiller gives rise to improved mechanical, thermal, and gas barrier properties of rubber mixtures. Depending on the application, natural bentonite is often modified by physical processes or by chemical processes (intercalation, cation exchange process, functionalization, pillaring, etc.). Chemical modification increases the size of the interlayer spaces and provides a hydrophobic environment. Functionalization (e.g., silanization), which encompasses the chemical grafting of thermally stable silane coupling agents onto the clay platelets, make inorganic bentonite and the organic polymer matrix compatible. In the introduced study, commercial bentonite P130 from Lieskovec deposit was modified by silane (3-aminopropyl trietoxysilane) treatment. Different techniques such as infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize modified and raw bentonite sample. Silanized P130s and raw product P130 were added to the natural rubber matrix to examine the influence of chemically functionalized bentonite on curing characteristic (M
H, M
L, t
s2, t
90, ΔM) and mechanical properties (TSb, Eb, hardness) of rubber vulcanizates. Organo-bentonite was mixed into a rubber blend in particular ratio of 5, 10, 15, 20 phr in various combination with silane (3-aminopropyl triethoxysilane), Perkasil and carbon black. The highest maximum torque values were obtained with the sample using 20 phr of silanized P130s. The tensile strength (TSb) values decreased with increasing P130 content, as well as non-silanized and silanized P130. However, when 20 phr P130s was used, value of TSb was higher. The most enhanced properties of rubber blends were found with the addition of 20 phr of silanized bentonite P130s.
Destructive and non-destructive testing of samples from PLA and PETG materials
Authors: Balint T , Živčák J , Hudák R , Tóth T , Kohan M , Lancoš S 
Published: November 2021

Abstract
This study deals with the properties of PLA and PETG materials, which are important for gaining knowledge in biomedical applications. The process of obtaining an ideal implant from a material with suitable mechanical and physical properties is a complex process considered to be one of the most difficult in tissue engineering. PLA and PETG material properties were determined based on performed non-destructive and destructive materials testing methods. Destructive testing was performed on Hegewald and Peschke equipment and non-destructive testing was performed on Carl Zeiss Metrotome 1500 (Germany). Commercial filaments from various companies were selected, from which type 5A dogbone samples were printed on a TRILAB printer. Subsequently, after carrying out the tests on dogbone samples, the results were evaluated and compared with the help of graphs and tables.
Modelling and optimization of energy intensity of an electrical discharge machine
Authors: Straka Ľ , Krenický T , Kuchta P 
Published: November 2021

Abstract
Nowadays, high fabrication productivity and high-quality products are a matter of course. However, it would not be possible without the use of highly sophisticated progressive technologies in the production process. But many of these modern production technologies are characterized by high consumption of energy. Given the current energy prices, this is not an insignificant amount of money. It is also necessary to point out, that in many cases the rule concerning the mutual interconnection of the energy intensity of production technologies with the resulting quality of the machined area applies. These reasons led us to the optimization of energy consumption in the context of the required quality of the machined surface in terms of selected indicators. The paper aims to describe the results of the performed experimental measurements in order to create mathematical models with subsequent optimization of electricity consumption of an electrical discharge machine. Unlike many types of research conducted in the field so far, the results of the solution were based on determining the relationships between the energy intensity of the electrical discharge machine and its controllable outputs in terms of the final roughness of the eroded surface. The performed optimization based on experimentally obtained results was directed so that its results could be applied in real conditions of technical practice.
System of Water Vehicle Power Plant Remote Condition Monitoring
Authors: Golovan A , Honcharuk I , Deli O , Kostenko O , Nykyforov Y 
Published: November 2021

AbstractRemote condition monitoring of water vehicles plays an important role in preventing potentially very expensive marine incidents and ensuring maximum efficiency of a ship's operation and reliability with minimum maintenance downtime and repair costs. Concept of the condition-based approach to maintenance is today's best practise, and it is becoming increasingly important to move from planned maintenance to condition-based maintenance, to reduce the increasingly high cost of maintaining a modern fleet. Onboard and remote monitoring is now an essential part of condition-based maintenance process to obtain the good quality data, correct analysis, and effective counteractive actions necessary for such an approach, and article presents the water vehicle power plant monitoring model developed by authors. Considered approach, coupled with preventive maintenance, saves shipowners time and money through early diagnosis of component failure or excess wear. Power plant of water vehicle comprises far more than just an engine with its auxiliary equipment but also other main propulsion blocks – in particular, thrusters. The result was the development of the Water Vehicle Condition Monitoring (WVCM) system, which enables to closely examine water vehicle equipment performance. A WVCM system comprises the following installed onboard: accelerometers, pressure and temperature transmitters, oil, fuel and exhaust monitoring units and a torque measurement system.
Experimental verification tests of isokinetic equipment used in sport and rehabilitation
Authors: Harčarik G 
Published: November 2021

Abstrakt
The paper deals with experimental verification of selected types of tests on isokinetic, diagnostic IsoForce2 training equipment. The isokinetic device provides accurate and immediate information about the developed strength in the exerciser's movement. The main criterion is its versatility when used in sport or rehabilitation. Therefore, it was necessary to create a portable adjustable structure that allows all the movements to be carried out and must meet other specific requirements. An important information is the amount of data collected, which is collected through the measurement system and then analyzed. The first test was elbow flexion, which was verified in arm-wrestling. The second test was knee flexion, which tested patients in rehabilitation after knee surgery to determine the difference in maximum strength between the lower limbs. The results of measurements are accurate, repeatable and provide athletes, patients, coaches and physiotherapists with immediate information about the level of strength abilities in a given type of test or movement.