Predrag Dašić

• Hon.D.Sc.
• Technical Editor at Engineering Academy of Serbia (IAS)

A combined translational and rotational system with different combinations of elements is used to find time-domain solutions and observe the forced response of a mechanical system with two degrees of freedom. Mathematical models for all four proposed cases are derived, and the proper outputs are plotted with the aid of MATLAB® and its numerical sim...

Bone tissue represents a hierarchical nanocomposite consisting of organic and inorganic components. At the macroscopic level, bones appear as solid structures, but on closer inspection, they reveal a hierarchical structure that spans from the microscale to the nanoscale. Nanotechnology enables the use of biomaterials with a biomimetic structure and...

The analysis of modern research shows that when evaluating the specific energy intensity of the abrasive processing process, one should pay attention not only to the indicators of grinding power and material removal rate, but also to the indicator of the wear of the abrasive tool, which we will show below for the grinding tool made of superhard mat...

High-precision tapered threads are widely used in hard-loaded mechanical joints, especially in the aggressive environment of the drilling of oil and gas wells. Therefore, they must be made of workable materials often difficult to machine. This requires the use of high-performance cutting tools, which means the application of non-zero geometric para...

The research results presented focus on the possibility of assessing the utilization of additive machine workspace through fractal analysis. This assessment enables a comparative analysis of the algorithm's effectiveness in placing 3D models of products within the workspace, considering essential criteria such as the uniformity of product material...

Saving the quality indicators of friction units during the entire period of operation is an important task connected with the problem of the reliability of machines and mechanisms. That leads to downtime and repair of technological systems. Considering the latter, predicting the tribotechnical behavior of materials during operation in a friction un...

The influence of modification on the textural properties of the natural zeolite (NZ) and its efficiency for the heavy metals ions removal from contaminated aqueous solution was investigated. The mineralogical composition of the NZ showed that the dominant mineral is clinoptilolite. The surface of the NZ was modified combining the methods for pure g...

High-precision conical threads are widely used in responsible joints in the drilling of oil and gas wells. Difficult underground drilling conditions due to the occurrence of significant mechanical loads and an aggressive environment in wells require the use of workable materials that are often difficult to machine. The huge need for such connection...

Piston-axial pumps play a crucial role in various industrial and mechanical systems, where the efficient conversion of mechanical energy into fluid pressure is essential. This study investigates the impact of the tilt angle of an inclined plate on the gradient of pressure increase within a piston-axial pump cylinder. By systematically altering the...

This paper presents a model of dependence between the parameters of surface roughness and the parameters of cylindricity and eccentricity in drilling operation for the enhancing steel EN 42CrMo4, hardness 28 HRC, with twist drills DIN 338 made of high-speed steel EN HS6-5-2, with normal blade. By the developing models based on artificial neural net...

The technology of ion-plasma coating is a continuous process that can be divided into three strictly consecutive stages. Compliance with the strict regulations of the technological process directly affects the quality of the finished product and the absence of defective products. Installation of ion-plasma spraying can operate almost automatically....

Standardization is essential for innovation (on the impacts on design, manufacturing, and operation processes) and its dissemination, both within a country and internationally. A phenomenological information model has been developed for the system of standards, which will be used as an information base for integrated quality management systems, env...

In this paper is given the results of a complex computational analysis of the structure, mechanism and kinetics of crystallization of the metastable modification of cerium, which is fixed in the products of quenching from a liquid state with a thickness of less than 80 μm, are presented. The given are results of model calculations of parameters cha...

The peculiarity of additive manufacturing is that steps are formed on the product surface resulting from the layered building. The steps’ dimensions are determined by the deviations of the real surface from its correct shape specified by 3D model of the product. The orientation of the 3D model of the product in the workspace of the additive machine...

The PLM concept implies the use of heterogeneous information resources at different stages of the product life cycle, the joint work of which allows the user to effectively solve the problems of product quality and various costs. According to the principle of isomorphism of complex systems’ regularities, an effective PLM system must have these regu...

Heterogeneous media can be represented as specially organized heterogeneous materials. The complex process of forming heterogeneous materials and media as systems is realized by gradually transitioning from one state to another. The presence of many one-time transformations of space-time structures causes the latter. When simulating damage such as...

One of the promising directions in the development of mechanical engineering is using of new non-metallic heterogeneous materials with high physical and mechanical properties. Such materials consist of two or more components (reinforcing filler and polymer matrix) and have specific physical and mechanical properties that are different from the prop...

The PLM concept implies the use of heterogeneous information resources at different stages of the product life cycle, the joint work of which allows you to effectively solve the problems of product quality and various costs. According to the principle of isomorphism of regularities of complex systems, an effective PLM system must have these regular...

In this paper, a static analysis of car wheel rims made of different materials was performed with the aim of determining their safety factors. Selection of suitable car rims is very important since they are subject to different loads and have the role of transferring car mass both in static and dynamic conditions. Considering the high stresses that...

Veljović, A. & Dašić, P. (urednici): Zbornik radova po pozivu Naučno-stručne konferencije sa međunarodnim učešćem “Tehnike i tehnologije za industriju 4.0” (TTI4.0-2022); Beograd, Srbija; 01. jul 2022. Beograd: Inženjerska akademija Srbije (IAS), 2022. – 115 str. ISBN 978-86-87379-22-0.

The total effect of technological and operational factors can lead to various types of deviations of the flank angle of the tool joint thread profile, which are uneven along the axis. It is shown that uneven deviations of the flank angle appear when tapered threading with a lathe tool with a non-zero rake angle. To analyse the effect of these devia...

The article considers the influence of the content of HB-4 amorphous alloy on the tribological properties of aromatic polyamide phenylone C-2. It was found that the introduction of a dispersed filler in the amount of 10-20 mass.% leads to a positive effect: reduction of abrasion index and roughness during friction on rigid abrasive particles of the...

Flame spraying is a thermal spray coating process that produces high quality surface coatings using heat, from the combustion of a fuel gas with oxygen. In the experimental part of the paper, laboratory tests were carried out on selected sprayed samples in terms of sample preparation for testing, measurement of chemical composition, recording of ch...

Floating bollards are one of the essential elements that determine the operability of a ship’s lock. The growing demand for increasing the operability of this type of device under the action of unpredictable loads exceeding the nominal requires the introduction of new design solutions. At the same time, it is rational to present the bollard in the...

The article presents the results of further research on developed algorithm possibilities for adaptive slicing using the example of a 3D models group located in the workspace of the additive machine. In this algorithm for adaptive slicing, each build step is calculated considering of distribution density of angles between the build direction vector...

The main concerns of logistics managers are providing the right number of resources at the right time, transporting them to the correct location in good condition, and delivering them to the right customer. To realise the logistics mission we have to achieve a lot of objectives. A logistics key performance indicators (KPI) are a quantitative tool t...

The paper deals with issues related to the calculation and design of prestressed crane structures of span type. The problem consists of the further application and use of a refined mathematical model of a preformed crane bridge, which allows analytically investigating its deformed behavior according to actual operating conditions. This paper analyz...

Information and communication technologies (ICT) are a set of equipment (devices, systems, etc.) and techniques with associated software (software systems and software tools) that have been developed and used for more efficient communication, creation, distribution, storage and management of information. The IDI (ICT Development Index) index is mos...

The ongoing implementation of Industry 4.0 in all segments of society will improve many aspects of human life and initiate many changes in business, production processes, and supply chains from raw materials to finished products. The implementation of new business methods leads to the transformation of production models and production processes, co...

The article features layout tools with parallel structure. It also developed dynamic simulation modelthat allows the simulation of a given law of motion of platform parallel mechanism and obtained suchvalued characteristics as speed, acceleration platform, changing the torque on the front crank,reactionary force kinematics of interaction mechanism...

One of the main requirements for the successful implementation of the Industry 4.0 concept in a country and/or region is certainly its digital infrastructure, and the main driving factors are certainly innovation and educational and training activities. The paper presents the trend analysis of innovation activities and global innovation index (GII)...

A decisive impact on the cost-effectiveness of any production is an integrated approach to product development. Constructors/designers, for this reason, strive to make the chosen solution so designed that it requires a minimum of material and time for its development. However, in product design, functional properties are what the designer must give...

Assembly and operational reliability of machines and mechanisms are significantly depending on the accuracy of sizes, forms, and positioning of parts. Systematic or accidental errors from set accuracy indexes define the error of edge metalwork. Related elastic displacements of edge and blank unit plus set movements of flexible system elements lead...

This paper presents the results of the process to qualify the pressure compensator system design as a result of the reactor coolant flow thermohydrodynamic instability for the management of accidents with a complete continued loss of power supply. Exposed are the features of transonic flow regimes at two-phase flows in the pipeline valves’ flow par...

This paper presents a model of dependence between the parameters of surface roughness and the parameters of cylindricity and eccentricity in drilling operation for the enhancing steel EN 42CrMo4, hardness 28 HRC, with twist drills DIN 338 made of high-speed steel EN HS6-5-2, with normal blade. The quality of machining, besides the accuracy of measu...

The efficiency of cold steel rolling depends mainly on the quality of the metal-working coolant (MWC) and its cost. In this connection, it is actual to search for new compositions of lubricants and emulsions, which provide the lowest values of the friction coefficients in deformation zone and are obtained by waste recycling in other industries. In...

This book offers a timely yet comprehensive snapshot of innovative research and developments at the interface between manufacturing, materials and mechanical engineering, and quality assurance. It covers a wide range of manufacturing processes, such as cutting, grinding, assembly, and coatings, including ultrasonic treatment, molding, radial-isosta...

This work presents the results of an analysis of the main expected potential problems that may occur in the implementation of the Industry 4.0 reform. It is proved that the pace and level of development of this reform will largely be determined by the effectiveness of the used mechatronic systems. It has also been established that as a result of sy...

The successful development and management of information systems and business analytics is crucial to the success of an organization. New technological developments and methods for data analysis have allowed organizations to not only improve their processes and allow for greater productivity, but have also provided businesses with a venue through w...

Industry 4.0 is a vision of advanced industrial manufacturing, and one of the foundations it relies on is robotic technology, that is, the implementation of industrial and service robots. Industrial robots have been implemented in all industries in the World in the automation and modernization of production processes. So far, the first generation o...

The influence of the processing conditions on the impact elasticity of polychlorotrifluoroethylene was considered in this article by the response surface methodology (RSM) with design of experiment (DoE). Impact elasticity is chosen as a parameter of optimization, since it is the most sensitive indicator to the changes in parameters of materials fo...

Structural analysis is the primary stage in the design of any mechanical system, which completely determines the effectiveness of its application in various fields of technology. One of the most effective tools for solving this problem is graph theory, which provides a convenient device for modeling structural properties of systems and relationship...

EGDI (e-Government Development Index) is used for measure the development of e-Gov in different regions and countries at the national level. The EGDI is a composite index based on the weighted average of following three indices: online service index (OSI), telecommunications infrastructure index (TII) and human capital index (HCI). The EGDI index i...

Considering the current state of production and marketing of hydraulic devices and systems in Serbia and world-renowned manufacturers, significant indicators and trends can be observed. Modern structural and production solutions for hydraulic devices are based on the application of new technologies and the introduction of new production capacities,...

The global innovation index (GII) is an indicator which annual ranking of countries by their capacity and success in innovation and innovative activities and published annually from 2007. According to the GII index, for the observed period 2009–2019, Serbia was in quartile Q2, except in 2009–2010 and 2016 when it was in Q3 and Q4. In the paper is g...

The world has gone through three industrial revolution so far and each of these industrial revolutions is the result of revolutionary innovations. In the first industrial revolution, a steam engine was invented that provided mechanization, in the second industrial revolution, a revolutionary innovation was electric power, and the third industrial r...

Nowadays, polystyrene foam materials are widely used in the world practice as technical and household containers, as well as food containers. After use, styrofoam is not recyclable, since it does not interact with water, and is not biodegradable. It cannot be burned like scrap, firewood, etc. due to the fact that very harmful gases are released in...

Grinding performance largely depends on the durability of the abrasive tool. Developed and tested solid lubricant for impregnating the working surface of the grinding wheel, which increases its cutting ability and, as a result, reduces the number of edits. Reducing the need for frequent revisions of the abrasive tool reduces dust generation in the...

The problem of defining optimal conditions for grinding plasma coatings may be considered as multi-objective optimization problem with a system of bounding inequalities that contain surface roughness, temperature, local and residual stresses as well as intrinsic defects size. This approach contributes to applying evolutionary algorithms such as gen...

The purpose of this work is to determine the influence of the product thickness of metal structure samples, as well as the location of the magnetizing device (transducer) on the magnitude of the coercive force. The experiment was realized as a complete plan of the experiment with repetition at the zero point, and the mathematical model was chosen i...

Hydraulic pumps belong to the basic devices of each hydraulic system, because they convert mechanical energy to the pressure of the working fluid. As a significant number of drive solutions are realized by gear pumps, special attention will be dedicated to them in this paper. Their basic comparative advantage is in the simplicity of conservative so...

This book offers a timely yet comprehensive snapshot of innovative research and developments in the area of manufacturing. It covers a wide range of manufacturing processes, such as cutting, coatings, and grinding, highlighting the advantages provided by the use of new materials and composites, as well as new methods and technologies. It discusses...

The proposed composition of solid technological lubricant applied to the working surface of the abrasive wheel directly in the grinding process. Experimental studies have been carried out to identify the effect of implanting on the normal and tangential components of the cutting effort and temperature that occur when grinding with abrasive wheels w...

The world has gone through three industrial revolution so far and each of these industrial revolutions is the result of revolutionary innovations. In the first industrial revolution, a steam engine was found that provided mechanization, in the second industrial revolution revolutionary innovation was electric power, and the third industrial revolut...

The purpose of this analysis is to evaluate the effectiveness of different modeling techniques for a COMAU six-axis robot arm. The robot manipulator represents one of the most used robots in the mechanical industry. For robots, with a high number of degrees of freedom, to obtain a kinematic model, Denavit-Hartemberg parameters allow representing ge...

Proposed is the method of heavy machine tools constructions' structural-parametric synthesis based on their components processing parameters statistical study. The process of designing high-power metal cutting equipment that most completely meets the customer's essential requirements consists in developing its technological structure in the form of...

This study is aimed at creating an accurate mathematical model, developed in Matlab-Simulink through the Simscape library, concerning an electric vehicle of class L7. To this end, a mechanical model with three degrees of freedom is used. The degrees of freedom are advancement, vertical displacement, and pitch. Two degrees of freedom are also added...

The effect of diffusion layers and alloying elements on surface hardness, micro-coarseness, and wear resistance of hardened tool steels in a nitrogen-containing medium is Studied. The experiments showed that nitriding in the powder mixture strengthens the surface layers in 2–3.5 times without reducing the volume strength of the material in question...

Abstract: All production processes in the world are implementing Industry 4.0 by using the basic technologies such as robotics & automation, intelligent sensors, 3D printers, radio frequency identification – RFID, cloud computing, Internet of Things and Internet of Services. Implementation of Industry 4.0 in all production processes is not possible...

Plasma coatings play a key role in surface tailoring through providing important advantages for tools during their further application. However, grinding these coatings may cause different defects such as grinding burns and cracks, structural changes to the coating material, and the destruction of adhesive contacts between the coating layer and the...

Analiza rada alata i odbacivanja pri sečenju težim mašinama pokazuje neophodnost upotrebe metoda modifikacije mase za poboljšanje strukturne čvrstoće i otpornosti na lomljenje cementnih karbidnih reznih ploča. Predlaže se testiranje reznih ploča radi procene ograničenja strukturne snage. Razvijena je ubrzana metoda za procenu otpornosti na rasuto k...

Both the experience and data from literature show that current hydraulic components and development of electric control systems have significantly increased energy efficiency. Therefore, all world manufacturers of hydraulic devices and systems use advanced technologies and methods with the final aim to integrate them into mechanical system. Energy...

The efficiency of cold rolling of steel strip in the main depends on the quality of technological lubricant and its cost. In this regard, it is important to develop new compositions of effective metalworking coolants that are low cost and provide maximum reduction in the friction coefficient. We developed and tested the new compositions of metalwor...

Pouzdanost sobraćajnog sistema se definiše kao njegova sposobnost da uspešno obavlja zadate mu funkcije i održava vrednost eksploatacionih parametara, u propisanim i zadatim granicama pod određenim uslovima i u datom vremenskom intervalu. U radu je prikazan razvoj dva softverska sistema za analizu pouzdanosti komponenti tehničkih sistema, i to: RAT...

The efficiency of cold steel rolling depends mainly on the quality of the metal-working coolant (MWC) and its cost. In this connection, it is actual to search for new compositions of lubricants and emulsions, which provide the lowest values of the friction coefficients in deformation zone and are obtained by waste recycling in other industries. In...

The efficiency of cold sheet and strip rolling of steels and non-ferrous metals in the main depends on the quality of the technological lubricant and its cost. In this regard, it is important to develop new compositions of effective metal-working coolants (MWC) having low cost and providing the maximum reduction in the friction coefficient. We deve...

In view of the fact that the endo-prosthesis heads of human hip-joint are operated in extreme conditions, in respect of load, the selection of corresponding material and also increase of precision and quality of machining of spherical surfaces is rather topical task. In the submitted work are reviewed the problems connected with definition of the i...

In the conditions of tribo-corrosion wear, extending of life time of parts can be achieved by using stainless steel, which is hardened to sufficiently high hardness. In the tribopair bolt/shell/slice of the bucket elevator transporter conveyor machine, the previously improved martensitic stainless steel for bolts is hardened at ≈ 45 HRC and welded...

Sažetak: U novom realnom svetu sve postaje digitalno i pametno (smart): digitalni gradovi, pametne fabrike, pametne kuće, pametni automobili, pametni telefoni itd. Pametne fabrike predstavljaju novu proizvodnu filozofiju nazvanu Industrija 4.0 (četvrta industrijska revolucija). To je nova generacija digitalizovanih fabrika koje su zasnovane na komb...

The main features are established for thermomechanical processes at the boundary of layers of TiC/TiN-coating applied to nitride ceramic proceeding under action of thermal and combined loads. The effect of basic ceramic structural element material on temperature and stresses formed in contact underlayers of TiC/TiN coating under action of these loa...

The article features layout tools with parallel structure. It also developed dynamic simulation model that allows the simulation of a given law of motion of platform parallel mechanism and obtained such valued characteristics as speed, acceleration platform, changing the torque on the front crank, reactionary force kinematics of interaction mechani...

Apstrakt: Grafen je altrop ugljenika u obliku dvo-dimenzione rešetke debljine jednog atoma. Skoro je u potpunosti providan i istovremeno toliko gust da ni najmanji atomi gasa ne mogu da prođu kroz njega. Dobro provodi elektricitet, kao i bakar, i veoma je jak (100 puta je jači od čelika, a može da se rastegne i do 20%). Ujedno predstavlja najtanji...

Установлены основные закономерности напряженного состояния границы между слоями двухслойного TiC/TiN-покрытия, нанесенного на нитридную керамику, под действием сосредоточенной и распределенной силы. Определено влияние материала основного структурного элемента керамики на напряжения, формируемые в контактирующих подслоях TiC/TiN-покрытия, под действ...

Electronic operating at high frequencies can have problems with emission of high frequency noise. Once put inside an enclosure, the energy will add in phase at certain frequencies to cause resonances which will hinder the performance of the device. These absorbers are based upon open celled foam impregnated with a carbon coating. It is quite possib...

The proposed paper shows some experimental results of a research in metallic structures inspection by using a high definition camera controller by high processing capabilities. The dedicated ARM Cortex-M4 initializes the ARM Cortex-M0 system for image acquiring. Then, by programming options, we are action for patterns (abnormal situations like meta...

Implementacija sistema za video nadzor omogućava monitoring i upravljanje saobraćaja kako bi se povećala bezbednost i sigurnost svih uĉesnika u saobraćaju. Takav sistem pruţa informacije u realnom vremenu o toku saobraćaja, zagušenjima i bilo kakvim potencijalnim bezbednosnim rizicima na razliĉitim delovima puta. Moderni sistemi imaju mogućnost kon...

BACKGROUND: Patient safety in hospitals is of equal importance as providing treatments and urgent healthcare. With the development of Cloud technologies and Big Data analytics, it is possible to employ VSaaS technology virtually anywhere, for any given security purpose. AIM: For the listed benefits, in this paper, we give an overview of the existin...

Background: Patient safety in hospitals is of equal importance as providing treatments and urgent healthcare. With the development of Cloud technologies and Big Data analytics, it is possible to employ VSaaS technology virtually anywhere, for any given security purpose. Aim: For the listed benefits, in this paper, we give an overview of the exis...

Razvoj tehnologije cloud računarstva je omogućio integraciju naprednih i skalabilnih platformi za skladištenje, obradu i distribuciju senzorskih podataka u tradicionalne sisteme nadzora. Video nadzor kao servis (VSaaS) je cloud servis koji obezbeđuje udaljene sigurnosne funkcije. Servis nudi visoko napredne funkcije sa elementima inteligentne obrad...

Jedne od glavnih citatnih baza podataka (Citation DataBases - CDB) u svetu su: SCI-E u oblasti prirodnih i primenjenih naučnih disciplina, SSCI u oblasti socijalnih naučnih disciplina i A&HCI u oblasti umetnosti i humanitarnih naučnih disciplina. Za 2015. godinu, unutar SCI-E sve naučne oblasti prirodnih i primenjenih naučnih disciplina razvrstane...

The article presents the results of the research, which confirmed the hypothesis of stabilization of residual stresses in the conductive materials by exposing the conductive surface of the product with powerful, periodic discharge of high voltage. The relevance of the work is the need for further improving the technological processes on the basis o...

An ITS (Intelligent Tutoring System) is a complex, integrated software system that applies the principles and methods of artificial intelligence (AI) to the problems and needs of teaching and learning. They allow searching the student level of knowledge and learning strategies used to increase or correct the students' knowledge. They are intended t...

Abstract: Technical development of cloud computing technology enabled the integration of powerful and scalable platform for storing, processing and distribution of sensory data. Video Surveillance as a Service (VSaaS) is a cloud computing service which provides remote security features. The service offers highly advanced features with elements of i...