IJET Vol. 3, Issue 4, December 2017

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https://hdl.handle.net/11363/550

International Journal of Engineering Technologies (IJET) Dergisi / International Journal of Engineering Technologies (IJET)

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International Journal of Engineering Technologies (IJET) Vol. 3, Issue 4, December 2017
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017) Bayram, Mustafa
Dear Colleagues, On behalf of the editorial board of International Journal of Engineering Technologies (IJET), I would like to share our happiness to publish the twelfth issue of IJET. My special thanks are for members of editorial board, publication board, editorial team, referees, authors and other technical staff. Please find the twelfth issue of International Journal of Engineering Technologies at http://ijet.gelisim.edu.tr or http://dergipark.gov.tr/ijet. We invite you to review the Table of Contents by visiting our web site and review articles and items of interest. IJET will continue to publish high level scientific research papers in the field of Engineering Technologies as an international peer-reviewed scientific and academic journal of Istanbul Gelisim University. Thanks for your continuing interest in our work, Professor Mustafa BAYRAM Istanbul Gelisim University mbayram@gelisim.edu.tr http://ijet.gelisim.edu.tr http://dergipark.gov.tr/ijet Printed ISSN: 2149-0104 e-ISSN: 2149-5262
Innovative Design for a Ball Worm Gear Mechanism
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Koçak, Sait
In this study, a new mechanism was designed and presented as an alternative to the worm gear mechanism without its disadvantages. This novel mechanism is referred to as a “ball worm gear mechanism”. The force of the worm gear mechanism is transmitted by a sliding movement, which leads to high operating temperature and low efficiency as well as wear on the bronze worm wheel. Therefore, a new mechanism was designed with balls placed into the helical grooves on the worm shaft which move by rolling on the worm wheel. The worm wheel of the newly designed mechanism is made of case-hardened steel, which is less expensive than bronze. Thus, it is anticipated that not only the cost of the worm wheel will be reduced, but also its life will be extended. Greater efficiency and elimination of the high operating temperature are expected to result from the power transmission achieved by the rolling motion of the new mechanism. Modeling of the design was carried out with SolidWorks software and the feasibility of the mechanism was confirmed.
Interactive Fuzzy Decision Making Algorithm for Two Level Linear Fractional Programming Problems
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Dalman, Hasan
This paper offers an interactive fuzzy decision-making algorithm for solving two-level linear fractional programming (TLLFP) problem which contains a single decision maker at the upper level and multiple decision makers at the lower level. In the presented interactive mechanism, the fuzzy goals and associated weight of the objective at all levels are first determined and the satisfactory solution is attained by renewing the satisfactory degrees of decision makers including the overall satisfactory balance among all levels. Moreover, the value of distance function is used in order to verify the satisfaction grades. Finally, a numerical example is given to illustrate the performance of the presented algorithm.
Effects of Arc Voltage and Welding Current on the Arc Length of Tungsten Inert Gas Welding (TIG)
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Ikpe, Aniekan E.; Ikechukwu, Owunna; Ikpe, Ememobong
The effects of welding current and arc voltage on arc length was investigated. Mild steel plates of 10mm thickness and 50mm x 100mm diameter were joined together through Tungsten Inert Gas (TIG) welding process for four (4) different intervals and the welding arc lengths were measured consecutively. The measured arc length for each welding interval increased from 1.19mm, 1.93mm, 2.54mm and 3.12mm as the current increased from 50A, 100A, 150A to 190A while the voltage also maintained the same increasing trend from 200V, 240V, 280V to 320V. The minimum arc length values measured for each welding interval with the aforementioned current and voltage range also maintained an increasing trend, and that led to the conclusion that the higher the welding current and arc voltage, the longer and wider the arc length which is an influential factor to other welding attributes.
A New Multilevel Inverter Based Parallel Active Power Filter
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Karaarslan, Korhan; Arifoğlu, Birol; Beser, Ersoy; Çamur, Sabri
Developments in the field of power electronics have increased the use of non-linear loads. The increase in the use of these loads causes power quality to decrease and problems to appear in transmission and distribution systems. The adverse effect of passive harmonic filters and the up-growing use of modern sensitive loads in the production process have made active power filters an important area of interest in eliminating current and voltage harmonics. In this study, a multilevel inverter topology for parallel active power filter applications has been proposed. The principle of operation for the proposed multilevel inverter topology is explained in detail. The harmonic components of the grid current which has a high total harmonic distortion (THD) value, are eliminated by the proposed multilevel inverter providing a reduced number of switching elements. The generation of switching signals for parallel active power filter application is also expressed with generalized formulas. All required operating states of multilevel inverter topology are given in detail to obtain reference filter current with harmonic components. In addition, the simulation studies carried out for different number of level modules and different values of harmonic distortion are presented. The obtained results show that the proposed multilevel inverter topology is suitable for parallel active power filter applications.
Binding Energy and Stability Calculations on Hydrogenated Forms of Substituted Carbazoles as Hydrogen Storage Materials
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Karakaya, Mustafa; Ucun, Fatih
The aim of this work is to explore the stable hydrogenated forms of carbazole and 9-methylcarbazole molecules by using M06-2X density functional as computational method. Binding energies per hydrogen atom in these hydrogenated forms were calculated by the counterpoise correction procedure. Relative energies, complexation and binding energies for the conformers of dodecahydrocarbazole were also calculated. Stabilities of all the hydrogenated forms were discussed by the analysis of the frontier molecular orbitals.
The Investigation of Wear Behaviour of Dual Phase Steel DP600
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-06) Aygül, Yasin; Ovalı, İsmail
Dual phase steels have been widely used in many applications in the automotive industry. In this study, the wear behavior of commercially available DP600 steel with dual-phase structure are investigated. The wear rate, volume loss and friction coefficient are used to optimize wear resistance of DP600 steel with dual-phase. Abrasive and Adhesive wear tests were carried out to determine the abrasive friction coefficient of the DP600 steel. Experimental studies show that the ferrite and martensite phases based on microstructures of the DP600 steel with dual-phase structure have an effect on tensile and wear tests. The wear resistance of DP600 steel can be controlled and optimized with wear condition (the wear rate, volume loss and friction coefficient).
Nonlinear Analysis of a Multiple Story Building Under Uniform Blast Loading
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Sabiou, Namata Saidou; Koçak, Ali
Nowadays, due to repetitively and intense terrorist attacks on infrastructure; many specialists in the field of construction or related to the field focus their researches on this unpredictable phenomenon. In this regard it is very important to take into account the effect of explosions on buildings and infrastructures during their conceptions, especially those for administrative, diplomatic and recreational purposes which have become the main targets of these abominable acts. An explosion which takes place within or immediately nearby a building can cause catastrophic damage on the building's external and internal structural frames, collapsing of walls, blowing out of large expanses of windows, and shutting down of critical life-safety systems. Loss of life and injuries to occupants can result from many causes, including direct blast-effects, structural collapse, debris impact, fire, and smoke. The response of reinforced concrete structures subjected to blast loads can be studied numerically using commercial finite element programs. This paper, hence, to get the structural response of structural elements within of a 6 storeys building, which is composed in frame system. A simulation of explosion which has been taking place in the ground floor of the building, using ABAQUS.
A Multi-Objective Approach for The In-Plant MilkRun in A Furniture Factory
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2017-12-13) Baran, Erhan
Today, facility optimization is one of the most important decision for the firms while establishing a new factory. It is necessary to carry work-in-process products between the production lines in firms. Many firms use trains to carry these items. In this study, an application is made in a furniture manufacturing factory. Firstly, the routes which the train can use in the firm are created. The alternative routes are compared with each other. The routes contain all of the production lines in the factory. Our aim is to route the train with minimum distance and minimum amount of cargo carrying. In this study, one train is used in the firm. It is also necessary to use minimum train for carrying the work-in-process products. The optimal route is determined by using some of the methods in the literature for multi-objective models.

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