Applied Engineering Letters

120-125

Authors: M. Anić, S. Savić, A. Milovanović, M. Milošević, B. Milićević, V. Simić, N. Filipović

Finite element method (FEM) has proved to be very successful in solving complex problems in engineering. In medicine, FEM found a special application in simulation of real problems and their solution while eliminating the need of learning from examples. In this paper, FEM was used with viscous fluid dynamics to simulate the function of left heart ventricle. Theoretical fundamentals of FEM and heart function were given. The paper represents illustrative example for educational purposes.

135-141

Authors: M. Miscevic, Dj. Dihovicni

In this paper the industrial automation of the production process, which is based on the fusion of a CNC machine and an industrial robot, is described. The functional structure of the flexible production cell, its configuration, programming methods and applications in industry are explained in detail. Based on the application of artificial intelligence, an example of making a machine part with the use of machines and software of the latest generation is given. Using this approach it is achieved significant shortening of production time, increased productivity and almost total elimination of scrap. Special attention is given to the current fourth industrial revolution and the application of the CAD / CAM / CNC concept in the future.

80-86

Authors: T. Skrucany, M. Stopkova, O. Stopka, S. Milojević

The article focuses on detection of fuel consumption in cars with the sparkignition engine aiming to determine the most accurate way of daily-use fuel consumption through evaluation finding. To achieve relevant outcomes, different routes underwent experiments in multiple consumption modes. In particular, these encompass four circuits varying in length, speed limit, intersection number with significant waiting time and the route ratio city/highway. Each segment saw three measurings in terms of different consumption forms – standard, economical and dynamic. Apart from that, fuel consumption detection also takes into cosideration possible deviations from consumed fuel when automatically switching off the fuel pump pistol. Three methods contributed to achieving the findings; i.e. quantification method, the technique of data subtraction from the on-board computer (On-Board Unit) and method of amassing data from a phone application. Ultimately, compiled tables and detailed diagrams show outcomes demonstrating the most convenient way and approach of measuring fuel consumption for daily-users.

94-103

Authors: M. Gostimirovic, M. Sekulic, D. Rodic

This paper reports on the research results of surface integrity of the workpiece in creep-feed grinding on the high speed tool steel. The creepfeed grinding is an advanced abrasive process widely used in industry of complex and heavy engineering products. An experimental investigation of the fundamental characteristics of surface metallurgy and surface roughness is carried out. The metallurgical properties were determined by an optical microscope, and through: microstructure, microhardness, cracks and burns. The surface roughness was determined with multiple important roughness parameters through scanning the surface topography (roughness average, mean roughness depth, maximum roughness depth and profile bearing length ratio). The results show that the grinding surface integrity is acceptable with good material removal rate, so that the creep-feed grinding process is an excellent choice for efficient and quality material removal. However, creep-feed grinding is not suitable for the final machining because of the possible metallurgical alterations due to high thermal load.

46-49

Authors: E. Gülbahçe, M. Çelik

In active vibration control of the smart structures, the dynamic characteristics directly affect the damping performance; also, the actuators are the important element for the vibration reduction. Therefore, the optimal placement of the actuators/sensors on the structure is the key parameter to enhance the control performance. Within this scope, in this study, the possible optimal placement of piezoelectric actuators/sensors on the cantilever smart plate structure is presented by using mode superposition method. The simple plate and the smart plate are investigated with respect to compare each other according to the modal parameters such as mode shape and natural frequency. The numerical studies based on the finite element analysis are conducted in ANSYS Workbench software. As a result of the study, it is seen that the strain intensity calculations obtained after the mode combination can be used in the layout of piezoelectric actuators. Thus, a fast and practical solution for preparing the basis of optimal actuators/sensors placement is presented.

62-67

Authors: Dj. Dihovični, S. Škrbić

The model of e-commerce web store is developed and analyzed from supply chain management view of point. Main focus of this scientific paper is highlighted on fuzzy approach to crucial data about products, stored in the database of e-commerce web shop. For unit price of the product, and the probability of buying product of certain dimensions, it is calculated the fuzzy mean of the expected prize and the variance. The SWARA method is implemented and relative weight criteria is calculated in order to optimize supply chain management.

8-15

Authors: T. Skrúcaný, F. Synák, M. Kendra, S. Milojević

The main purpose of the paper is to determine the change in vehicle energy efficiency due to using the air conditioning system. There is a connection between the changes in vehicle energy efficiency and fuel consumption together with time needed for vehicle acceleration. The paper comprises the measurement results performed at stabilized speeds as well as during vehicle acceleration. The final part of the paper outlines the result of calculation of change in vehicle energy efficiency resulting from air conditioning unit used during New European Driving Cycle.

22-30

Authors: G. K. Makrygiannis, D. P. Margaris

The simple geometry configuration of T-junctions and their capability to act as partial phase separators, especially on offshore platforms, made them common pipeline system components in power and process industries. Moreover, in the pursuit of achieving better phase separation by controlling the maldistribution occurred in the component phases of a mixture at the junction, industries often utilise reduced T-junctions. Nevertheless, most of the published data in which industries was based on to adopt the previous configuration was relating on fully horizontal T-junctions with large main pipe diameters although T-junctions are rarely placed in a horizontal position in such industries, whilst the usage of small main pipe diameters could also lead to scaling down their size. In this regard, the present paper aimed to extend the available data by performing numerical analysis and studying both regular and reduced T-junctions with a small main pipe diameter, and upward inclination angles. It was observed that reduced T junctions performed worse in terms of phase separation compared to regular T-junctions for all inlet conditions applied and irrespective of the side arm inclination, whereas in case of regular T-junctions a superior separation performance was ensured for the inclined side arm at 30°.