MM Science Journal, December 2022

CALIBRATION OF THE ROBOTIC ARM WITH CORRECTIONS USING LOCAL LINEAR NEURO-FUZZY MODELS

PETR BENES, JAN HLADIK, JAN PELIKAN, ZDENEK NEUSSER, MARTIN NECAS, JIRI SVEDA, MICHAEL VALASEK, ZBYNEK SIKA
Keywords: Robot calibration | Local linear model | Neuro-fuzzy model | parameter identification | Accuracy of machine positioning

The paper deals with the enhancement of the robotic arm calibration using corrections based on local linear neuro-fuzzy models. After the standard calibration of the geometric parameters in the robot's kinematic model, there are still residual errors between the measured positions and the positions predicted by the model. The source of these errors are various non-geometric parameters and nonlinear phen (…)

STUDY OF SELECTED BURNER PARAMETERS ON THE GAS-AIR MIXTURE COMBUSTION

MIROSLAV RIMAR, JAN KIZEK, ANDRII KULIKOV, MARCEL FEDAK
Keywords: burner | combustion | CFD simulation model | vortex mixing

The study of the combustion of a gas-air mixture using burners opens possibilities for further research, in which it is possible to modify the parameters of existing burners (geometry, method combustion air distribution, ...). Flame length can be influenced by changing some of the burner parameters to achieve the best possible conditions in the combustion chamber. The topic of the article is to study th (…)

SELECTION CRITERIA OF WORKING PAIRS ADSORBENT - ADSORBATE FOR THERMAL ENERGY TRANSFORMERS

MIROSLAV RIMAR, KOSTYANTYN SUKHYY, ELENA BELYANOVSKAYA, ОLEKSANDR YEROMIN, ELENA PROKOPENKO, ANDRII KULIKOV, MARCEL FEDAK, LILIA FROLOVA, GRIGORIY PUSTOVOY, OLHA KULIKOVA, VITALII SAVKO
Keywords: thermal mass | adsorption conversion of thermal energy | composite adsorbent | adsorption | marginal adsorption

In the manuscript the main factors that affect the thermal mass of open and closed types of heat storage devices are shown. Also, the main requirements for adsorption modules are given. The calculation procedure has been refined, which includes the determination of heat load, heat of adsorption, adsorbent mass, as well as integral, structural, and specific thermal mass. The specific thermal masses of ad (…)

INFLUENCE OF COMPOSITE SPINDLE RAM ON MACHINE TOOL DYNAMIC STIFFNESS

VIKTOR KULISEK, PETR KOLAR, JAN SMOLIK, MILAN RUZICKA, MIROSLAV JANOTA, MARTIN MACHALKA
Keywords: Machine tool | light-weight design | fibre composites | damping | Simulation | stiffness

Demands for improving machine tool productivity and accuracy can be addressed using alternative material structures with the potential to reduce the mass of moving bodies and decrease machine tool dynamic compliance. A useful option is to apply composite materials because they offer high damping and low density in comparison with steel or cast iron. The key question is how the stiffness and damping of a (…)

COMPENSATION OF WORKTABLE MOTION ERROR BY AN ACTIVELY CONTROLLED HYDROSTATIC GUIDEWAY

TOMAS LAZAK, EDUARD STACH, JAN SMOLIK, IVAN DIVIS, TOMAS FORNUSEK
Keywords: hydrostatic guideway | Machine tool | angular error compensation | straightness error compensation

The accuracy of machine tools is limited by many factors,such as geometric and thermal errors. Current error reduction approaches include e.g. volumetric compensation. However, if a machine tool has only linear axes, angular errors cannot be compensated since there is no controllable axis that could change the tool or workpiece inclination. Therefore, an actively controlled hydrostatic guideway was deve (…)

INCREASING TOOL LIFE THROUGH ADJUSTMENT OF CUTTING EDGE AND TOOLPATH DURING MILLING OF INCONEL 718

PETR VAVRUSKA, JAN MALY, ANTONIN NOVOTNY
Keywords: tool | cutting edge | Toolpath | Nickel alloy | milling | tool life

This paper focuses on analysis of tool life during milling of nickel alloy Inconel 718. Several modifications of one type of carbide tool with different cutting edge finish adjustments (lapping, drag finishing) were proposed for milling of Inconel 718. These finish adjustments significantly influence cutting edge properties (hardness, radius value, etc.). The toolpath geometry setup has a great influenc (…)

THERMO-MECHANICAL ANALYSIS OF A MACHINE TOOL WITH HYDROSTATIC BEARINGS

EDUARD STACH, JAN SMOLIK, MATEJ SULITKA, TOMAS LAZAK, IVAN DIVIS, JIRI FALTA
Keywords: hydrostatic | machine | tool | Thermal | Behaviour | speed | lathe

Thermal behaviour is a key factor affecting the operatingstatus of high performance hydrostatic (HS) bearings of rotational axes of machine tools (MT). This paper introduces a novel model developed for transient thermo mechanical analysis of hydrostatic guideways with a surrounding MT structure. In contrast to common approaches to HS bearing design, which only consider the static load carrying capacity, (…)

ISSUES OF CYBERSECURITY OF THE PRODUCTION SYSTEM

KARLA MARADOVA, PETR BLECHA, RADIM BLECHA, JANA ROZEHNALOVA, VOJTECH FRKAL
Keywords: Cyber security | threat | integrated production system | prevention | cyber-attack | infrastructure

Cybersecurity of production systems is a very topical issue in response to the dangers associated with the very high number of cyber-attacks in Europe. The current digital transformation of the industry associated with the digitalisation of manufacturing brings both the positives associated with increased flexibility and productivity of production, and the negatives associated with the risk of data loss (…)

AN UPDATE OF THERMAL ERROR COMPENSATION MODEL VIA ON-MACHINE MEASUREMENT

MARTIN MARES, OTAKAR HOREJS, MICHAL STRAKA, JIRI SVEDA, TOMAS KOZLOK
Keywords: Thermal errors | Compensation | accuracy | on-machine measurement | Probing | Machine tool

Software compensation is state-of-the-art technology used to reduce CNC machine tool thermal errors, and it belongs to a key intelligent functions of modern machine tools. However, a pretrained and nonadaptive model may not be accurate and robust enough for long-term application. This research presents a transfer function based thermal error compensation model updated via on-machine measurement. A mathe (…)

INCREASE OF INDUSTRIAL ROBOT ACCURACY BASED ON KINEMATIC ERRORS COMPENSATION

STEPAN CHLADEK, JIRI SVEDA, ZBYNEK SIKA, PETR BENES
Keywords: Industrial Robot | positioning accuracy and repeatability | robot kinematic calibration | laser tracker measurement | artifact measurement

Industrial robots are used in many technical applications from simple pick-and-place tasks to complex machining, welding and assembly applications. The repeatability of the robots is usually high. However, the accuracy is much lower, and it decreases with the robot size selected. Robot calibration represents a possible way to increase accuracy, and two main approaches have been distinguished. Kinematic (…)

DESIGN OF METHOD FOR NONLINEAR SHEAR MODULUS MEASURING IN GEL-LIKE MEDIUM BY APPLYING AN ADDITIONAL STATIC STRESS TO AN ACOUSTIC RESONATOR

MILAN SAGA, TIMOFEY B. KRIT, ZUZANA SAGOVA, SHAMIL A. ASFANDIYAROV, VALERY G. ANDREEV, BORIS A. YAKIMOVICH, VLADIMIR V. KUVSHINOV
Keywords: acoustical resonator | gel-like media | shear moduli | cubic nonlinearity | relaxation

Measurements of the nonlinear parameter of a gel-like medium were carried out in an acoustical resonator fixed without slipping between two solid-state boundaries. A sample of thickness L is fixed on an oscillating plate (x = 0). The other plate of finite mass on the free surface of the sample (x = L) moves together with this surface. By changing the mass of the plate (x = L), it is possible to achieve (…)

RHEOLOGICAL PROPERTIES OF POLYMER-POLYMER MIXTURES ON CORN STARCH BASE

MIROSLAV RIMAR, ARTEM TRETYAKOFF, KOSTYANTYN SUKHYY, ОLEKSANDR YEROMIN, ANDRII KULIKOV, MARCEL FEDAK, ELENA BELYANOVSKAYA, IHNAT SHUNKIN, OLENA GUPALO, TIBOR KRENICKY
Keywords: polymer | corn-starch | biodegradable polymer

The prospects for the use of polymer-polymer mixtures based on corn starch as alternative thermoplastic materials to polyolefins are considered. Rheological curves have been obtained, which confirm the possibility of processing such mixtures on standard equipment into products. It is shown that the starch content in polymer-polymer mixtures can reach 90 mass percent. Compared to existing biodegradable p (…)

GEOMETRIC PRECISION OF THE CYLINDERS SURFACES MACHINED WITH WEDM TECHNOLOGY

LUBOSLAV STRAKA, TIBOR KRENICKY
Keywords: geometric accuracy | optimization | quality | wire electrode | Wire Electrical Discharge Machining (WEDM)

One of the progressive production technologies through which it is possible to machine complicated shapes in materials characterized by high hardness is electrical discharge machining with a wire electrode. However, as with other progressive technologies, in the case of electrical discharge machining technology, demanding customer requirements for the geometric accuracy of the machined surface are not a (…)

A VIEW ON HUMAN CAPITAL IN INDUSTRY 4.0

PETRA MARKOVA, MARIA HOMOKYOVA, VANESSA PRAJOVA, MARTINA HORVATHOVA
Keywords: employee | industry 4.0 | Work 4.0 | work change | work competencies

The article's subject is the definition of areas where space is created for targeted workforce management and its successful implementation within the Industry 4.0 concept. In most cases, if we talk about the performance of Industry 4.0 elements, the investments of enterprises are primarily directed to the area of production, information and communication technologies, research and development, not to t (…)

PRINT SPEED AND ITS IMPORTANCE FOR METAL ADDITIVE MANUFACTURING

MARTIN NOZAR, JAKUB ROSENTHAL
Keywords: additive manufacturing | PBF | Low-Angle Surface | Print Speed | Time-homogenization

The article deals with issues which occur when using different types of basic print speeds in metal additive manufacturing. It describes their importance, mutual relationships and their influence on the quality of pieces manufactured using this technology. The ability to manage the speed of the additive manufacturing process allows us not only to effectively improve print quality but also, for example, (…)

THE INFLUENCE OF HYDROGEN CONCENTRATION IN NATURAL GAS ON HEAT FLOWS IN A THERMAL AGGREGATE

MIROSLAV RIMAR, JAN KIZEK, AUGUSTIN VARGA, MARCEL FEDAK, GUSTAV JABLONSKY
Keywords: natural gas | hydrogen | combustion | heat flow | flue gas

Natural gas is currently a hotly debated topic both from an environmental point of view due to the production of CO2 and from an economic point of view. The article is focused on the analysis of selected energy factors when burning natural gas with a gradual increase in the hydrogen content in the fuel mixture. In the article, the authors focused on modelling combustion and the influence of hydrogen con (…)

APPLICATION OF PROGRESSIVE TECHNOLOGIES BASED ON DIGITALIZATION IN MECHANICAL ENGINEERING

IVANA KLACKOVA , TATYANA IVANOVA , IVAN KURIC, ALEKSANDR KORSHUNOV , VLADIMIR KORETCKIY
Keywords: maturity of technologies | oil production | digital technologies | smart production technologies | oil field

Using digital technologies in its activities, an oil producing enterprise is able to gain a success only when a strategic approach is applied and, establishing a balance between actual and actual capability is equal to capability to beneficial transformations. The oil-extracting businesses digitalization of oil producing enterprises fundamentally alters key technologies throughout the entire life cycle (…)

INNOVATIVE TECHNICAL VERSION OF THE INDUSTRIAL CONTAINER

DARINA MATISKOVA
Keywords: industrial container | hinged lid | innovated design | lid opening

The present article deals with a technical design of industrial containers for bulk and piece materials. The introductory section of the article introduces several alternatives of the container types and describes their applications. The following section presents the original technical design of an industrial container, based on the theory, followed by a description of a newly developed design of an in (…)

COMPLETE DYNAMIC MODEL VALIDATION OF 3- DOF COMPLIANT MANIPULATOR WITH FLUIDIC MUSCLES

TOMAS CAKURDA, MONIKA TROJANOVA, ALEXANDER HOSOVSKY
Keywords: dynamics | Lagrangian formalism | Fluid Muscle | Angular robotics arm | Validation

The article is devoted to the description of the validation of the dynamic model of an angular manipulator with three degrees of freedom of movement based on the chosen course of excitation of pneumatic artificial muscles from the manufacturer FESTO. The dynamic model consists of the dynamics of the manipulator arm and the dynamics of the pneumatic part of the experimental system. The motion equations w (…)

PROCEDURE OF APPLYING THE GENETIC ALGORITHM FOR THE CREATION OF A PRODUCTION LAYOUT

MARTIN KRAJCOVIC, IVAN ANTONIUK, LADISLAV PAPANEK, RADOVAN FURMANN, VLADIMIRA BINASOVA, VSEVOLOD BASTIUCHENKO
Keywords: digital twin | manufacturing | GA | job shop

Due to the rapid increase and development of new information technologies, it is now possible to collect real data from the production process, thereby creating an image of a real plant in a virtual environment. The concept of a digital twin in the design of production systems consists of creating a digital twin of the entire production plant, which consists of a digital, real and virtual enterprise, wh (…)

TESTING HUMAN ERRORS IN VIRTUAL REALITY TRAINING

LUBOS KOTEK, ZDENEK TUMA, KAMIL SUBRT, JIRI KROUPA, PETR BLECHA, JANA ROZEHNALOVA, RADIM BLECHA, PETR HEINRICH
Keywords: Virtual Reality | HUMAN FACTORS | training | HUMAN ERRORS | CONTROL PANEL

The emergency training of industrial process plant operators is one of the most widely used tools to increase the reliability of human factors to handle an emergency situation. However, the preparation and operation of full-fledged simulators and trainers is very expensive and, therefore, virtual environment tools are used. A question that has not yet been answered is: Can virtual reality match the reli (…)

ERGONOMIC RISK ASSESSMENT OF TAKING THE PRODUCT DIRECTLY FROM THE PRODUCTION LINE

DANIELA ONOFREJOVA, HANA PACAIOVA, ZUZANA KOTIANOVA, JURAJ GLATZ, JOZEF KULKA
Keywords: Ergonomic risk | healthy workplaces | multi-sensor measurement system | production performance

Creating healthy workplaces considering ergonomic risks is becoming a necessary part of preventive approach in design of workplaces. Preventive approach has positive impact including economical, health and safety measures. Corrective approach can be used when e.g. health issues must be improved. Performance analysis is important for employers in competitive domestic or global market. If the analysis is (…)

APPLICATION OF TRIBOTECHNICAL DIAGNOSTIC METHODS IN CASE OF DETERMINATION OF COEFFICIENT OF OPERATIONAL RELIABILITY OF MACHINE TOOLS

JOZEF MASCENIK
Keywords: Friction | wear | greasing | tribology

The submitted paper analyses the check of operational capacity and of economic efficiency of the selected machines in case of the use of different types of oil, determination of mode of friction and of machine wear and specification of interval of oil change. The object of the paper is a machine park in the industrial company comprising of five machine tools. Particularly, it is the case of two grinding (…)

SpinBOT KIT THE NEW GENERATION OF ROBOTS – ANALYSIS OF OPERATING CHARACTERISTICS

JURAJ SMRCEK, PETER SMERINGAI, ANNA SMERINGAIOVA
Keywords: intelligent robotic system | Collaborative Robots | modularity | flexibility | safety | operating characteristics | reconfiguration

The reconfigurable robotic system SpinBOT Kit represents a new generation of robotic technology designed to solve the automation and robotization of production, non-production processes and service processes, with wide use in various sectors of industrial and non-industrial sectors and in municipal services. This paper presents an analysis of the parameters and characteristics of this reconfigurable rob (…)

EXPERIMENTAL TESTS TO ASSESS THE DYNAMIC CHARACTERISTICS OF WORM GEARBOXES

ANNA SMERINGAIOVA, TOMAS CORANIC, MATEJ HRABCAK
Keywords: experimental tests | worm gears | dynamics | measurement methodology | vibrodiagnostics

The article deals with the issue of experimental assessment of the dynamics of worm gears. The design of the methodology and the material and technical assurance of experimental tests to determine the impact of the use of various structural modifications on the dynamics of the worm gear are described. In the pilot part of the experiment, a gearbox was tested with an original design solution of bearing t (…)