Mechanical Engineering Faculty in Slavonski Brod

Slavonski Brod, Croatia

Mechanical Engineering Faculty in Slavonski Brod

Slavonski Brod, Croatia
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Antun S.,Josip Juraj Strossmayer University of Osijek | Antun S.,Vinkovci County General Hospital | Tomislav B.,Mechanical Engineering Faculty in Slavonski Brod | Tomislav S.,Zadar General Hospital | And 2 more authors.
Periodicum Biologorum | Year: 2017

Background and purpose: Cyclic biaxial burst test is a novel approach in biomechanical testing of fetal membranes. The purpose of the study is to determine are there differences between cyclic biaxial burst test and standard burst test. Relations between newborn and maternal anthropometric data and membrane biomechanics were investigated. Materials and methods: Thirty-nine fetal membranes were tested. Each membrane was cut in half acquiring one half closer to placenta and one closer to cervix. Samples for tensile, biaxial cyclic and standard tests were taken from each. Maternal and newborn anthropometric data was examined. Results: Cyclic burst pressures were significantly higher than standard burst pressures in samples closer to placenta (83.8 ± 19.4 vs 69.3 ± 17.9 mmHg; p<0.001) and cervix (67.9 ± 23.4 vs 58.1 ± 15.8 mmHg; p=0.013). When compared according to type of delivery, cyclic pressures were higher than standard in c-section samples (80.6 ± 22.4 vs 59.1 ± 14.8 mmHg; p<0.001) and vaginally delivered samples (73.5 ± 22.7 vs 65.9 ± 18.6 mmHg; p=0.017). Positive correlation between pregnancy BMI and uniaxial test rupture force was established. Conclusions: Cyclic biaxial test is closer to physiological conditions and tests membrane viscoelastic properties better than standard test. A positive correlation between maternal pregnancy BMI and uniaxial force-to-rupture may indicate a connection between maternal nutritional status and fetal membrane strength. © 2017 Croatian Society of Natural Sciences. All rights reserved.


Duspara M.,Mechanical Engineering Faculty in Slavonski Brod | Samardzic I.,Mechanical Engineering Faculty in Slavonski Brod | Stoic A.,Mechanical Engineering Faculty in Slavonski Brod
Procedia Engineering | Year: 2016

This paper presents an algorithmic conversion process of data written on a weekly basis in the format of data on a monthly basis, including all the data specifics. The aim is to graphically and numerically display the results of the conversion and the size of the errors that is the time running. The main method used for averaging data is average data value. Research shows that the conversion error, ie. loss of the original value is below 2.5%. © 2016 The Authors. Published by Elsevier Ltd.


Damjanovic D.,Mechanical Engineering Faculty in Slavonski Brod | Kozak D.,Mechanical Engineering Faculty in Slavonski Brod | Holik M.,Mechanical Engineering Faculty in Slavonski Brod
Tehnicki Vjesnik | Year: 2017

Eave framework is analyzed in this paper from the standpoint of statics. Loads taken into account are self-weight, snow weight and wind influence. 3D model of eave framework is generated in the software PartSolution (Cadenas) with certain simplifications in geometry. Simplifications are taken into account in order to reduce costs of the numerical calculation, especially the FSI calculation. The resulting pressure distribution solution obtained from CFD calculation is set as the boundary conditions on the eave framework when performing structural analysis. Solutions for equivalent stress as well as deformation are presented and analyzed. Also, solutions for airflow prediction around the eave framework are presented in order to analyze if it is possible to perform some changes in the construction in terms of reducing the air resistance and thus reducing the wind load on the construction. © 2017, Strojarski Facultet. All Rights Reserved.


Talar R.,Poznan University of Technology | Stoic A.,Mechanical engineering faculty in Slavonski Brod
Metalurgija | Year: 2012

The paper presents some results of investigation of finish machining of hardened bearing surfaces of cylindrical gear wheels. Finish machining has been performed with wedges of defined geometry made of CBN. The presented investigation results are related mainly to the wear processes of the cutting wedges. Additional results of quality examination of finish machined gear wheels have been presented, too.


Svalina I.,Mechanical Engineering Faculty in Slavonski Brod | Sabo K.,Josip Juraj Strossmayer University of Osijek | Simunovic G.,Mechanical Engineering Faculty in Slavonski Brod
International Journal of Advanced Manufacturing Technology | Year: 2011

Surface roughness is often taken as an indicator of the quality of machined work pieces. Achieving the desired surface quality is of great importance for the product function. The paper analyzes the influence of the cutting depth, feed rate, and number of revolutions on surface roughness. The obtained results of the experimental research conducted on the work piece "diving manifold," were used to determine the coefficients by different numerical methods of the same prediction model. The results of the surface roughness provided by the prediction functions generated in this work were compared with the results of the surface roughness obtained by using neural networks. The assessment of the surface roughness provided by models and neural networks can facilitate the work of less experienced technologists and thus shorten the time of production technology preparation. The obtained results show that the total mean square deviation in models obtained by the application of the moving linear least squares and the moving linear least absolute deviations methods is nevertheless considerably higher than by the application of the neural network method. © 2011 Springer-Verlag London Limited.


Sertic J.,Mechanical Engineering Faculty in Slavonski Brod | Kozak D.,Mechanical Engineering Faculty in Slavonski Brod | Samardzic I.,Mechanical Engineering Faculty in Slavonski Brod
Scientific World Journal | Year: 2014

The values of reaction forces in the boiler supports are the basis for the dimensioning of bearing steel structure of steam boiler. In this paper, the application of the method of equivalent stiffness of membrane wall is proposed for the calculation of reaction forces. The method of equalizing displacement, as the method of homogenization of membrane wall stiffness, was applied. On the example of "Milano" boiler, using the finite element method, the calculation of reactions in the supports for the real geometry discretized by the shell finite element was made. The second calculation was performed with the assumption of ideal stiffness of membrane walls and the third using the method of equivalent stiffness of membrane wall. In the third case, the membrane walls are approximated by the equivalent orthotropic plate. The approximation of membrane wall stiffness is achieved using the elasticity matrix of equivalent orthotropic plate at the level of finite element. The obtained results were compared, and the advantages of using the method of equivalent stiffness of membrane wall for the calculation of reactions in the boiler supports were emphasized. © 2014 Josip Sertić et al.


Svalina I.,Mechanical Engineering Faculty in Slavonski Brod | Galzina V.,Mechanical Engineering Faculty in Slavonski Brod | Lujic R.,Mechanical Engineering Faculty in Slavonski Brod | Simunovic G.,Mechanical Engineering Faculty in Slavonski Brod
Expert Systems with Applications | Year: 2013

The close price prediction model of the Zagreb Stock Exchange Crobex® index is presented in this paper. For the input/output data plan modeling the Crobex® index close price historical data are retrieved from the Zagreb Stock Exchange official internet pages. The prediction model is created in the way that for each of 5 days in advance it predicts the Crobex® close price. The prediction model is generated based on the input/output data plan by means of the adaptive neuro-fuzzy inference system method, representing the fuzzy inference system. It is of the essence to point out that for each day a separate fuzzy inference system is created by means of the adaptive neuro-fuzzy inference system method based on the same set of input/output data, the only difference being that for every separate fuzzy inference system different subsets for training and checking are used so that input variables are differently created. The input/output data set represents the historical data of the Crobex® index close price from 4 November 2010 to 24 January 2012 and the Crobex® index close price is predicted for the subsequent 5 days, the first day of prediction being 25 January 2012. After that the above mentioned input/output data set is shifted 5 days in advance and the Crobex® index close price is predicted in advance for the next 5 days starting with the last day of the input/output data set. In that way the Crobex® index close prices are predicted until 19 October 2012 based on the Crobex® index close price historical data. At the end of the paper qualitative and quantitative estimates are presented for the given approach of predicting the Crobex® index close price showing that the approach is useful for predicting within its limits. © 2013 Elsevier Ltd. All rights reserved.


Duspara M.,Mechanical Engineering Faculty in Slavonski Brod | Palatinus T.,Mechanical Engineering Faculty in Slavonski Brod | Samardzic I.,Mechanical Engineering Faculty in Slavonski Brod | Maric D.,Mechanical Engineering Faculty in Slavonski Brod | And 2 more authors.
Procedia Engineering | Year: 2016

This paper describes problem during water jet cutting with low (different) surface roughness on square workpiece, according to direction of abrasive feeding and cutting head moving direction. In this experiment, three types of water jet cutting machine were tested, with different types of entrance angle of abrasive in mixing chamber with inclination from the z-axis (angle) θ = 90°, 60° and 50°. Material for test specimens was stainless steel AISI 316L with 20 mm thickness. Cut shape was square with side length 50 mm. Surface roughness was measured on three cutting depths: 6 mm, 12 mm and 18 mm. Results of surface roughness measurement for each side of specimen were obtained. Also, statistical analysis of scattering was made, in order to determine scattering of values of machined surface. © 2016 The Authors. Published by Elsevier ltd.


Grizelj B.,Mechanical engineering Faculty in Slavonski Brod | Cumin J.,Mechanical engineering Faculty in Slavonski Brod
Metalurgija | Year: 2013

This paper deals with the effects of technological parameters used in the V-die bending process, on the obtained product properties and dimensions. By variation of the tool geometry, several cases of steel sheet bending process are observed through the FEM simulations. Also by variation of different mechanical material properties, effects on product geometry are observed. Since the automobile manufacturers mostly use the high strength steel sheet metal plates, there is a need for the successful tool construction and optimization in order to produce quality products.


PubMed | Mechanical Engineering Faculty in Slavonski Brod
Type: | Journal: TheScientificWorldJournal | Year: 2014

The values of reaction forces in the boiler supports are the basis for the dimensioning of bearing steel structure of steam boiler. In this paper, the application of the method of equivalent stiffness of membrane wall is proposed for the calculation of reaction forces. The method of equalizing displacement, as the method of homogenization of membrane wall stiffness, was applied. On the example of Milano boiler, using the finite element method, the calculation of reactions in the supports for the real geometry discretized by the shell finite element was made. The second calculation was performed with the assumption of ideal stiffness of membrane walls and the third using the method of equivalent stiffness of membrane wall. In the third case, the membrane walls are approximated by the equivalent orthotropic plate. The approximation of membrane wall stiffness is achieved using the elasticity matrix of equivalent orthotropic plate at the level of finite element. The obtained results were compared, and the advantages of using the method of equivalent stiffness of membrane wall for the calculation of reactions in the boiler supports were emphasized.

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