Mirko Djapic - Academia.edu (original) (raw)

Papers by Mirko Djapic

In the development phase, the designer makes decisions under uncertainty, contradiction and ignor... more In the development phase, the designer makes decisions under uncertainty, contradiction and ignorance conditions. This paper presents an improved decision making process in such a way that when the designer made a decision he or she is shown at the same time the result of customer satisfaction on the decision made. In order to solve above problems, the paper describes the method which integrates the use of an axiomatic approach to designing and the Taguchi method of robust design. This approach implies the modelling of the development process as an evidence-reasoning network based on uncertain evidence described via the belief functions of the Dempster-Shafer theory. We introduce the coefficient of relative decrease of uncertainty in design process. From an example of belt-flywheel design we present a new hybrid paradigm for product/manufacturing design in uncertainty conditions.

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2019

Improving flexibility, identifying parts and assigning process operations in flexible production ... more Improving flexibility, identifying parts and assigning process operations in flexible production are elements that can potentially influence the improvement in the management process. RFID technology has been widely applied in various areas of logistics, supply chain, storage, retail and transport. In flexible production systems, RFID technology is still in the developing phase. The process of applying RFID technology in a production system enables real-time information about the parts included in the system. This information can always be used to improve production efficiency and reduce costs. Also, the data of the production of components involved in the production, such as operations, both manipulative and productive, can be recorded on RFID tags, linked to the component by which the system is decentralized, and the production process gets more flexible and agile. This article deals with the designed architecture of the flexible production in FMC based on RFID technology and management system based on a set of agents. The findings presented in this study show that the shown framework is more capable than the most of the implemented ones in the current production practice, especially if the process is dynamic, unknown to the management, and has the requirements of reconfiguration.

Dr Mirko Djapić, LOLA Institute, Kneza Višeslava 70a, Beograd, mdjapic@yahoo.com, 2) Dr Ljubom... more 1) Dr Mirko Djapić, LOLA Institute, Kneza Višeslava 70a, Beograd, mdjapic@yahoo.com, 2) Dr Ljubomir Lukić, Mechanical Engineering Faculty Kraljevo, Dositejeva br 19., Kraljevo, pbs1 ... Under such conditions, organization information assets face serious security threats. ...

In the nineties years of the previous century, the European Union achieved, through introducing t... more In the nineties years of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analyzing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modem business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents basis of the E,U New and Global Approach and give an approach to integrating New Approach Directives risk assessment into the holistic approach of risks management in organization, such as ERM

Use of information technology enables better communication of railways organizations with their e... more Use of information technology enables better communication of railways organizations with their environment. Under such conditions, railways organization information assets face serious security threats. Following this, the paper presents the information security concept and the ISO/IEC 27000 series standards that provide a harmonizing approach to development, implementation and maintenance of information security management systems (ISMS).

European Union has accomplished, through introducing New Approach to technical harmonization and ... more European Union has accomplished, through introducing New Approach to technical harmonization and standardization, a breakthrough in the field of technical products safety and in assessing their conformity, in such a manner that it integrated products safety requirements into the process of products development. This is achieved by quantifying risk levels with the aim of determining the scope of the required safety measures and systems. The theory of probability is used as a tool for modeling uncertainties in the assessment of that risk. In the last forty years are developed new mathematical theories have proven to be better at modeling uncertainty when we have not enough data about uncertainty events which is usually the case in product development. Bayesian networks based on modeling of subjective probability and Evidence networks based on Dempster-Shafer theory of belief functions proved to be an excellent tool for modeling uncertainty when we do not have enough information about ...

Power transformers are in the category of capital equipment of power plants and high voltage elec... more Power transformers are in the category of capital equipment of power plants and high voltage electricity distribution networks. Factory ABS Minel Transformers in Ripanj designs and produces (manufactures) power transformers with power up to 400 MVA and voltage level up to 400 kV, by using modern methods of calculation and design. Producers (manufactures) of power transformers perform certification of characteristic types of their products in accredited laboratories and by doing that they gain significant advantage in international tenders. Moreover, international standards prescribe functional characteristics which must be laboratory tested (before delivering each transformer to the customer) at delivery moment of each transformer to the user (customer). Lately, the customers increasingly insist on requirements in respect to noise level of transformers, which are sometimes more strict than those requirements prescribed by the standard, in order to protect working and living environm...

The paper displays the realization of the railway transportation of the biggest step-up transform... more The paper displays the realization of the railway transportation of the biggest step-up transformer, not only in Serbia but in the southern part of Europe, rated 725 MVA, from thermal power plant TENT B in Obrenovac to the ABS Minel Transformatori factory in Ripanj, where the general overhaul of this energy transformer is under way. The transportation and manipulation process of energy transformers during the overhaul is particularly complex, since it is specified as the railway freight of oversized capital product cargo. Energy transformers fall under the category of capital electric energy equipment that have an exploitation period of over 30 years on hydro energy and thermal energy plants or high-voltage substations. Depending on the power and voltage level, the mass of an energy transformer can be up to 400t, while the price can reach as much as a million Euros. The overhaul of energy transformers of great power is a very specific technological process that is carried out in specially equipped factories.

Engineering machining processes realized in flexible manufacturing systems (FMS) is a highly comp... more Engineering machining processes realized in flexible manufacturing systems (FMS) is a highly complex engineering task, especially since it encompasses complex optimization procedures apart from engineering. For a broad array of different workpieces produced in different series it is very difficult to engineer a manufacturing process for attaining maximum processing productivity with minimal production costs. The paper presents a developed post-processor model enabling automatic generating of the NC code for all NC programs executed simultaneously in the production process on a greater number of machining centers. The model engrosses the different variants of tools in a machining center magazine, a different combination of elements of the machining mode, possibility of the most favorable layout of workpieces on palettes, compliance with the technological requirements in terms of simultaneous tool changes in machining center magazines, the required total processing time and minimal pr...

IOP Conference Series: Materials Science and Engineering, 2019

The contemporary market conditions impose increasingly strict requirements on organizations. Orie... more The contemporary market conditions impose increasingly strict requirements on organizations. Orientation towards product quality is one of the optimum strategies enabling survival and development in the ever more globalized market. The business practice required by ISO 9001 standard is often insufficient for an organization to survive in the market. Therefore many organizations, in addition to developing and implementing Quality Management System (QMS), optimize their operative processes by implementing the Lean tools. The paper provides a concept of interconnecting the ISO 9001:2015 standard requirements with the possible Lean tools deployment, which is to contribute to promoting effectiveness of the implemented QMS.

International Journal of Machining and Machinability of Materials, 2017

This paper explores the modelling of technical expertise in metal-cutting processes in a form sui... more This paper explores the modelling of technical expertise in metal-cutting processes in a form suitable for the development of computer-aided process planning (CAPP) in intelligent manufacturing systems using agent-oriented software technologies. Focusing on the selection of tools and cutting parameters in the design of machining operations, the ontology for the knowledge domain was first introduced, and then in that context identify and analyse some of the challenges that CAPP presents to the multi-agent system architect. In particular, interactions between operation design and setup design was investigated, issues arising from global impacts of local decisions in plan construction were examine, and differences between software agents and humans in comparable planning roles were discuss. The analysis leads to several multi-agent design patterns that help capture domain-specific know-how and integrate it into efficient team behaviour. A pattern is illustrated with a concrete scenario.

Tehnicki Vjesnik, Aug 21, 2013

Subject review In the nineties of the previous century, the European Union achieved, through intr... more Subject review In the nineties of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analysing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modern business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents the basis of the EU New and Global Approach and gives an approach to integrating New Approach Directives risk assessment into the holistic approach of risks management in organization, such as ERM.

Many organizations encounter the problem of development and implementation of Integrated Manageme... more Many organizations encounter the problem of development and implementation of Integrated Management System (IMS), based on the quality requirements (ISO 9001), preservation of environment (ISO 14001) and occupational health and safety assessment standard (OH&SAS 18000). In order to help the organizations in this venture, the paper presents some of the key definitions which explain the concept. This work provides an approach to the integration of different standards requirements, based on the interrelation of mutually connected business processes.

Advanced Materials Research, 2013

Throughout the 1990s, the European Union achieved, through introducing the New and Global Approac... more Throughout the 1990s, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, significant improvements to conformity assessment of products, by integrating safety requirements into the design process. This was achieved through preventative analysis and quantification of risk levels, with the objective of determining the scope of the required safety systems. On the other hand, we have witnessed the rapid development and implementation of holistic approaches to risk management in enterprises, collectively known as Enterprise Risk Management (ERM). Along these lines, this chapter presents the basis of the New and Global Approach, and provides a proposal for the integration of New Approach Directives risk assessment into the holistic approaches of risk management in organizations, such as ERM.

International Journal for Quality Research, 2008

This paper presents a general approach to the product conformity assessment which is required by ... more This paper presents a general approach to the product conformity assessment which is required by EU New and Global Approach. As an example, some of the results of the project TD-7082B are presented relating to the harmonization of machine tools with the requirements of the relevant EU directives and harmonized standards.

The presented research displays an original method for defining optimal machinability parameters ... more The presented research displays an original method for defining optimal machinability parameters for metal cutting, by using drilling as an example. Machinability parameters, as exponential values in Taylors extended equation are defined for a broader specter of workpieces grouped into diverse groups according to heat states, mechanical and chemical features. The model for the optimization of cutting processes is based on the Taylor equation, providing an analytical dependency between the cutting speed and tool life. From Taylors equation have been derived extended expressions determining the functional dependency between elements of the cutting mode and machining conditions, including a presentation of the methodology of experimental and mathematical determining of machinability parameters in realistic industrial conditions. Thus have been analytically defined the major dependencies between the characteristic parameters of the machining process, enabling the engineers of FMS tech...

FME Transaction

During the product development phase, especially in the case of innovative products, designers us... more During the product development phase, especially in the case of innovative products, designers used to face the unpleasant situation to be obliged to take decisions under conditions which are characterized by a relevant degree of uncertainty and even contradiction. This situation is quite frequent in the very early phases of the design process, where a large part of external conditions are not fully defined. It is also the case of a designer of machine tools. As methodological response able to fill this informative gap, the present paper presents a way for using "evidential systems" as supporting tool for designers. These tools represent a sort of expert systems in which knowledge is represented and processed by the function of the Belief Function Theory (also called Dempster-Shafer Theory). In particular, beyond a deep description of this methodology, the paper is focused on the conceptual design of a machine tool, i.e. determination of the best structure of machining center in the phase of conceptual design for a predefined group of wooden parts that are being machined on them.