Table of Contents

  • FORCES AND DEFORMATIONS IN THE LINEAR ROLLER BEARING

    pg(s) 10-13

    To the modern machines, especially those for the workflow automating, have been made more greater demands regarding the accuracy of their work under different conditions. In relation to this, in most constructions have been used linear bearings, which are especially suitable because of a number of their advantages.

    The present article aims to show the determination of the forces and deformations of a linear roller bearing of specifically selected series, depending on the speed and acceleration at work, as forces and friction coefficients in different parts of the bearing have been previously specified and taken into account in the calculation.

    As a result of the dimensioning it becomes possible to determine the duration of operation of the linear roller bearing of the so-set conditions, and the deformations in the various parts under load.

  • VIRTUAL FULL FACTORIAL EXPERIMENT IN THE SIMULATION OF A CONTINUOUS PROCESS SPD COMMERCIALLY PURE TITANIUM WITH THE INFLUENCE OF FRICTION FACTOR

    pg(s) 14-17

    With the use of computer modeling in the environment of the DEFORM-3D software, a virtual full factorial experiment has been conducted for the processing of commercially pure titanium by equal-channel angular pressing (ECAP) via the Conform scheme. In the course of the modeling, the effect of independent parameters (the rotation velocity of the working wheel, the friction factor on the lateral surfaces of the working wheel and the friction factor between the billet and the die) has been evaluated. As a result of the experiment, a regression equation has been obtained and the most important individual factors and their mutual combinations that influence the response parameter (strain intensity) have been identified.

  • MECHANICS OF TECHNOLOGICAL INHERITANCE

    pg(s) 18-21

    Increasing demands for the quality and longer service life of machine parts require methods of strengthening treatment with plastic deformation of the surface (PDS). The PDS processes become significantly more efficient when technological inheritance is taken into consideration. The mechanics of technological inheritance was developed by the author and exemplified by the life cycle of a part, in-cluding processes of cutting and PDS as well as fatiguing, which occurs during the operation stage. Theoretical and experimental findings include key patterns of technological inheritance and can be applied to engineering of efficient strengthening processes.

  • DEVELOPMENT AND IMPLEMENTATION OF MANAGEMENT SYSTEM OF QUALITY – MAIN FACTOR FOR SUSTAINABLE DEVELOPMENT OF PRODUCTION SYSTEMS

    pg(s) 22-24

    Quality management systems based on the International Standards ISO (International Organization for Standardization) is a revolutionary way to increase the competitiveness of Bulgarian companies in the energy sector on the European and international energy market. Тhe implementation of international standards and management systems is becoming a major tool to reduce production costs, increase productivity, reduce the cost of manufactured products and services through the creation of optimal models of governance and organization of the key processes in the energetic sector companies. Development and implementation of management systems, good manufacturing practices and achieving product compliance with European and international standards is a promising trend. In proposed authors post after presentation of the International Organization for Standardization ISO is studying and analyzing systems applied quality management in projects in the field of energy development.

  • FINANCIAL – ECONOMIC ASSESSMENT OF INNOVATIVE PROJECTS

    pg(s) 25-27

    The national economy restructuring ,the European Union membership and globalization clearly outline the necessity of implementation of various activities, including innovation by which companies to form long-term competitive advantages. This creates the need for implementation of systematic and reliable research of the effectiveness of the implemented innovation as a component of overall efficiency. This requires improvement and grounded updating of traditional approaches to financial and economic evaluation of the planned innovation and related activities. In the proposed work are presented the opportunities for planned innovations economic assessment with the help of financial and economic instruments through the use of information technology.

  • A STUDY ON THE IMPLEMENTATION OF THE DISCIPLINED CONVEX OPTIMIZATION METHOD FOR THE IDENTIFICATION OF THE DYNAMIC SYSTEMS’ MODELS

    pg(s) 28-31

    In this paper the author investigated the implementation of the convex optimization method in the area of the estimation of model parameters from experimental data. The investigation focused on the identification of processes within the technical environment such as: the liquid flow process, the mechanical vibrating process and the electric arc discharge. The theoretical support related to the convex optimization algorithm is emphasized in the first section of the paper. The preconditions for the implementation of the algorithm within the system identification context are also presented. In the third and the fourth sections, the main analysis is made. The mathematical models of the processes under investigation and the software implementations are depicted. The results showed that for an input signal, equivalent with the Dirac impulse, the disciplined convex optimization algorithm provide consisted estimate of the process under investigation which is similar to the results from the classical least-squares identification algorithm. These results are the basis for further investigations on the implementation of the convex optimization algorithm for system identification.

  • THE APPLIANCE OF OPEN INNOVATION CONCEPT IN SMEs IN REPUBLIC OF MACEDONIA

    pg(s) 3-6

    The open innovation is a concept of growing acceptance in the field of innovation management. It is based on the idea that companies can leverage the knowledge generated externally to improve their innovation performance. Open innovation as a process can promote shorter innovation cycles, increase in industrial research, and better optimization of the resources. However the process of open integration is much harder for implementations in SMEs than larger enterprises. The reasons behind the low integration of the open innovation as a process can be seen in the low capacity of the SMEs to deal with the open innovation process, low awareness of the benefits of the open innovation process, lack of knowledge for the intellectual law and rights, etc. This paper is based on the empirical research on 63 SMEs, in order to determine the factors (reasons) for low implementation of the open innovation process in the SMEs in Republic of Macedonia.

  • CALCULATION OF FREQUENCY CHARACTERISTICS OF SPLIT PHASE OF POWER TRANSMISSIONS LINES

    pg(s) 32-33

    The article discusses the free-running sweep split phase (SP) power lines. We derive a nonlinear differential equation of torsional movement split phase by using Lagrange’s equation of the 1st kind. In order to obtain an approximate solution of the nonlinear problem applied the method of Van der Pol. Analyzed degree of influence of parameters of power lines on the frequency of torsional vibrations of SP.

  • ASPECTS OF RISK MANAGEMENT IN LOGISTICS ACTIVITIES OF ENTERPRISES. APPLICATION OF FAULT TREE ANALYSIS (FTA)

    pg(s) 34-38

    Risk management in logistics enterprises is one of the important topics in the management of supply. In today’s global reality characterized by constant and rapid changes that make high degree of uncertainty and risk, make the logistics activity critical.

    The purpose of this article is to present the main aspects of risk management including the construction of the risk profile in logistics activity in enterprises and demonstrate the applicability of the FTA, which was developed conditional example. This will considerably facilitate efforts directed at risk management in logistics activity in enterprises.

  • TECHNOLOGY HIGH-SPEED SHARPENING CARBIDE TOOLS

    pg(s) 7-9

    Modern machines allow to position cutting tools relative to the workpiece with an accuracy of 1 micron, but increasing of producing detail accuracy can be achieved only by an increase of sharpness of the cutting tool, which will guarantee allow to cut required metal pads of the size of 2 … 5 microns, and will reduce the time spent on finishing operations. Existing manufacturing techniques and sharpening of cutting tools let to receive the sharpness of the blade up to 10 microns. A further increase of sharpness is only possible with the use of high-speed sharpening.