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Öğe Bağımsız Süspansiyonlu Ticari Araçlarda Elektronik Kontrollü Dümenlemenin Araştırılması(Selçuk Üniversitesi, 2019) Adıyaman, Ahmet; Acaroğlu, MustafaIn this study; we research that whether the steering mechanism is used in commercial or non-commercial vehicles can be controlled electronically with the Ackermann model. The working mechanics were modeled in SolidWorks CAD program, practical application was performed and controlled with Arduino processor by using stepper and DC motors. Step control experiment was carried out with step motor, time and sensor analyzed experiment was carried with dc motor. The study was revised for the 3 models that were tested mechanics and the study was completed with revisions made on Arduino software. Cause of the stepper motor step jumping problem; instead of the stepper motor, DC motor close circuit control is made possible. It was observed that the mechanics and rotary joints should be supported with bearings, if the friction is minimized and the position control is performed correctly, the efficiency can be obtained from the DC motor and the servo motor can be used if the accuracy is more important.Öğe Mesnet Farklılıklarının Bazalt Elyaf Takviyeli Kompozit Boruların Düşük Hızlı Darbe Davranışlarına Etkisinin İncelenmesi(Selçuk Üniversitesi, 2019) Demirci, Mehmet Turan; Yozgat, UğurIn this study, ±55o filament wound BFR / Epoxy composite tubes have been supported by a steel shaft with placing inside the composite tube according to internal diameters. Low velocity impact tests were performed at 15J and 20J energy levels for BFR / Epoxy composite tubes supported by the steel shaft and unsupported. As a result of the tests, maximum impact forces, displacement changes and absorbed energy amounts of BFR / Epoxy composite tubes supported by the steel shaft and unsupported were determined. The effects of a steel shaft support of ± 55o filament wound BFR/Epoxy composites on low velocity impact behavior were investigated. It was determined that the maximum force value increased and the amount of displacement decreased by the steel shaft support.Öğe Elektrospin Metodu ile Üretilen ZnO Nano Partikül Katkılı Pan Nanofiberlerin Isıl İletkenliğinin ve Elektiriksel İletkenlerinin İncelenmesi(Selçuk Üniversitesi, 2019) Dinçer, Kevser; Köse, AhmetIn this study, thermal conductivity and electrical conductivity of polyacrylonitrile (PAN) nanofibers reinforced with zinc oxide (ZnO) nanoparticles were investigated. First, PAN+ dimethylformamide (DMF) solution was prepared. In this solution, PAN is 8 % by weight. ZnO nanoparticles were added to the PAN solution at 1, 3 and 5% by weight. With this solution, PAN nanofibers with ZnO nanoparticles were produced by electrospin process. The electrospin device was operated at a voltage of 15 kV, the distance between the needle tip and the collector was 12 cm, the feed rate was 2 mL/h. Thermal conductivity and electrical conductivity of pure PAN and ZnO doped PAN nanofibers were investigated. In this study, the maximum thermal conductivity and electrical conductivity values are 0.91 W / mK for 5 Watt power and 5.35x10-3 S/cm, respectively. These values were obtained in PAN nanofiber with 5% ZnO nanoparticle.Öğe Elazığ-Karakoçan Depreminin Tusaga-Aktif İstasyonlarına Etkisi(Selçuk Üniversitesi, 2019) Şanlıoğlu, İsmail; Başkan, Gökhan; Zeybek, MustafaThe East Anatolian Fault Zone (EAFZ) is one of the active fault zone causing a number of large earthquakes in Turkey. Turkish National Permanent GNSS Network-Active (TNPGN-Active) has been available in Turkey since 2009. The network plays an effective role in determining the deformations caused by earthquakes. Near the EAFZ, on March 8, 2010, the Elazığ-Karakoçan earthquake of 6.0 Mw had been occurred. The aim of this study is to determine the magnitude and direction of displacement of Karakoçan earthquake by means of TNPGN-Active stations data. AUSPOS (Australian Online GPS Processing Service) that is web based data processing system was used to adjust the data of stations. Adjustment results of 5 days before and 5 days after the earthquake date of TNPGN-Active stations near EAFZ, which are estimated to be affected by Karakoçan earthquake had been analyzed. According to the results of 5 days before and after Karakoçan earthquake, displacement was determined at Bingöl (BING) station, e.g. the maximum displacements of -8.8, +9,5 and -19,6 mm, are in the north, east and up directions, respectively. It is concluded that the displacement levels in the north, east and vertical direction determined at the other stations are not significant since they were three times smaller than the calculated standard deviations before the earthquake.Öğe Eklemeli İmalat İçin Topoloji Optimizasyonu : El Freni Mekanizması Uygulaması(Selçuk Üniversitesi, 2019) Top, Neslihan; Gökçe, Harun; Şahin, İsmailIt is in the expectation of all designers and engineers to turn a design that will be produced, multifunctional, with high strength and light weight. Topology optimization is one of the optimization techniques applied in this direction. With topology optimization, it is possible to obtain parts with complex geometries and lattice structures. The force is applied by imposing restrictions on a newly designed or existing solid model. After the optimization process is completed, the material distribution is optimized, light and multifunctional products can be obtained. However, it is impossible to produce these complex parts with conventional manufacturing methods. A number of modifications have to be made to the model and this restricts the freedom of designers. With the increasing use of additive manufacturing technologies, parts in complex geometry can be produced in a single process step. The use of these technologies makes it possible to produce parts obtained as a result of topology optimization. Within the scope of this study, it was ensured that the handbrake bracket was optimized with topology optimization and reached the ideal form and the material distribution was alleviated. Selective Laser Sintering (SLS) method, which is one of the additive manufacturing methods of the part obtained after the process, is planned to be produced without any additional parts after the completion of the model.Öğe Arıtılmış ve Sanal Gerçeklik İle Periyodik Cetvel Öğretimi(Selçuk Üniversitesi, 2019) Avcı, Ahmet Fatih; Taşdemir, ŞakirRapid developments in technology affect every stage of our lives and lead to change. Especially information communication technologies can be important in this change. Almost all disciplines, including the field of education, use information technologies for different purposes. The increase in the production and use of mobile devices has led to the development of technologies and applications for these devices. One of the most important use environments of such augmented and virtual reality technologies is the field of education. These kinds of applications interact with virtual models on the real world and contribute to education by making experiences as real. In educational institutions, while theoretically explaining the lessons, at the same time to make applications in laboratory environment; increase the comprehensibility and persistence. Unfortunately, every educational institution cannot open a laboratory. Augmented and virtual reality technologies are capable of precisely eliminating this lack. It will enhance the learning effect and provide a variety of experience environments by making people both entertaining and making the subject more attractive. Processing a science course in a laboratory environment will make understanding easier. In this study, a visual educational virtual and augmented reality (hybrid) game is designed for the subject of periodic table in the science course with Unity 3D game engine. With this application, students can understand the subject of periodic table as if they were in a laboratory environment. They can learn the elements in the periodic table in an experimental environment, both in an audible and visual environment. With this application, students who do not have laboratory facilities can do their experiments. With the application, students are free from the risks that may occur chemically in the experimental environment and can experience more impressive understanding processes in an interactive environment. The game can be used on mobile devices with Android and IOS operating systems. The game was designed effectively by the students who took the topic of periodic table in game science course.Öğe Saf Yönelim Hareketlerini Sağlayan Üç Serbestlik Dereceli Bir Paralel Platformun Kinematik ve Dinamik Analizi(Selçuk Üniversitesi, 2019) İnal, Rıdvan Uğur; Adlı, Mehmet Arif; Özkan, BülentWith parallel platform manipulators, it is possible to obtain different rotational and orientational degrees of freedom by using several number of actuator and joints. In this study, a type of spherical parallel manipulator is proposed to perform control system stabilization loop tests of imaging systems and blurring effect tests of optical systems are done by three degrees-of-freedom (DOF) manipulator with all pure rotational degrees of freedom. Kinematic analysis is done by applying the known procedure from previous works for this parallel manipulator. However, dynamic analysis of this mechanism is done by Newton-Euler methodology, which is not popular on 3-DOF parallel platform with this type of leg configuration. Computational work has been done by following procedure and the simulation results are discussed.Öğe Volatile organic compound removal using polyurethane based selective membrane(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Nigiz, Filiz Uğur; Hilmioğlu, Nilüfer DurmazIn this study pervaporative separation capability of silica incorporated thermoplastic polyurethane (TPU) membrane was investigated at different case studies. Representative waste disposal for different industry was prepared synthetically. Toluenewater, chloroform-water, formic acid-water, isopropyl alcohol-water mixture were prepared in concentration of 3 wt. % and the pervaporation experiments were performed at 40 °C. Membrane morphology was analyzed using scanning electron microscopy and polarized optical microscopy. Effect of membrane preparation technique on membrane affinity to the organic mixture was also investigated and the results were evaluated as a function of degree of swelling. Better flux of 0.73 kg/m2.h and a separation factor of 14.9 were obtained at chloroform-water pervaporation. Pervaporation was also effective in toluene-water mixture separation. The quantitative results of the flux was chloroform>toluene>formic acid>isopropyl alcohol.Öğe Comparative study between sensorless vector control and nonlinear control for PMSM based on Extended Kalman Filter (EKF)(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Maanani, Yacine; Menacer, Arezki; Harzelli, ImadeddineThis paper presents the performance of sensorless nonlinear control compared with vector control of permanent magnets synchronous machine. The speed estimation is done by Extended Kalman Filter (EKF). The robustness of the control is tested for the parameter variation and for the machine operating at low speed. The simulation results show the robustness of the filter and the overall drive system.Öğe Utilization of chrome ore concentration plant tailings as fine aggregate in ready-mixed concrete(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Çelikten, Serhat; Canbaz, MehmetLarge amount of the chrome ore concentration plant tailings was discarded during chrome ore mining process. The accumulation of the tailings takes large areas of land for the storage and causes environmental and safety problems. When the annual consumption of the ready mixed concrete per person (approximately 1.5 m3/person) in Turkey is considered, employment of the tailings in the ready-mixed concrete may be a solution for the recovery of the tailings. In addition, using chrome tailings as a substitution for sand to produce ready-mixed concrete is a possible way to solve the resource problem of sand deficiency. The aim of this study is to investigate the utilization of the tailings taken from a chrome ore concentration plant in Eskisehir, Turkey as fine aggregate in ready-mixed concrete production. For this purpose, the tailings were partially replaced with the fine aggregate by the weight at 0, 10, 20 and 30% proportions by weight in the ready-mixed concrete mixtures. Standard curing is applied until the time of test to the 15x15x15 cm cube specimens taken from the mixtures. The unit weight, compressive strength and ultrasonic pulse velocity values of the cubic specimens were investigated in this study. Performed tests showed that replacing sand to chrome ore tailings has a potential for further investigations.Öğe Establishment of an FPGA-based real-time im experimental setup and online im model verification(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) İnan, Remzi; Barut, MuratIn this study, Serial Peripheral Interface (SPI) communication between the ADS 8568 EVM-PDK (Evolution Performance Development Kit) Analog to Digital Converter (ADC) developed by Texas Instrument and Xilinx XC5VLX110T FPGA board is implemented in order to verify Induction Motor (IM) model in real-time. Analog datas obtained from the voltage, current and torque transducers are converted to digital datas by ADC and read with FPGA simultaneously in real-time. Thus, the ??- stator stationary axis components of the stator voltage ( and ) and ??- axis components of the stator current ( and ) are calculated by Clarke transformation. The load torque is obtained by passing the measured signals from the torque transducer through the lowpass filter which is implemented on the FPGA using 64-bit double floating number format. In addition, the signals obtained from the incremental encoder are read by the FPGA after the voltage level shifting with 74LS245P Integrated Circuit (IC), so that mechanical speed (or ) of the rotor can be measured. All measurement algorithms except for the lowpass filter constructed for load torque measurement are implemented with VHDL by using 32-bit single floating numbers. The real-time verification of the rotor flux-based IM model is performed offline before it is implemented on FPGA by using the stator voltages, currents and load torque measured from the IM by using the simultaneous measurement unit in real-time. Thus, an FPGA-based real-time open-loop experimental setup of IM is established for the future works about the estimator/observer based speed-sensorless control of IMs.Öğe Effects on the surface quality in the machining processes of the tool vibrations(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Türkeş, Erol; Neşeli, Süleyman; Şahin, Mümin; Selvi, SelçukThe problem of surface quality and cutting stability in the machining processes is very important and is strictly connected with the final quality of the product. Therefore, this paper describes a new theoretical model for the dynamic cutting forces of orthogonal cutting in turning. A specific advantage for the presented model is the convenience for vibration prediction. The presented dynamic force model is used to predict variable cutting forces with dynamic cutting between cutting tool and workpiece. This model is considered two degree of freedom complex dynamic model of turning with orthogonal cutting system. The complex dynamic system consists of dynamic cutting system force model which is based on the shear angle (?) oscillations and the penetration forces which are caused by the tool flank contact with the wavy surface.Öğe Switched H2 state-feedback control for polytopic systems based on dwell time(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Kemer, Emre; Prempain, EmmanuelThis paper introduces a H2 sub-optimal approach to design state feedback controllers for switched system with parameter uncertainty. Minimum dwell time stability analysis techniques are revisited and combined with the H2-optimal control to obtain a robust state feedback controller for switched systems. Two kinds of Lyapunov functions have been used to find a switched controller, the time varying and constant controller gains have been given for the switched system. The proposed approaches have been illustrated by means of examples.Öğe Studies on mechanical performance of cynara scolymus/polyethylene terephthalate nonwoven composites(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) İzgi, Ayben Adalet; Koçak, Emine Dilara; Şahinbaşkan, Burcu Yılmaz; Merdan, Nigar; Ardıç, BüşraGlobal warming, energy consumption and the desire to obtain products from renewable sources have led to a resurgence of interest in plant-derived products. Plant fibers with some interesting inherent properties like cost, effectiveness, renewable, available in high quality, have low fossil-fuel energy requirements, and can offer good mechanical properties has attracted it use for composite materials. Hemp, jute, flax, bagasse, coconut fiber, and bamboo are among the natural fibers which has attracted attention because of their low cost compared to synthetic fibers such as glass, carbon etc. Natural fiber reinforced composites are finding successful application in the automotive, electronics, and engineering sectors. In this study, Artichoke (Cynara scolymus) fibers are obtained from the West Mediterranean Region of Turkey. Firstly the stem of plant was removed than the fibers were gained. Nonwoven surfaces were obtained at different percentages by to the mix Cynara scolymus / polyethylene terephthalate (PET) fibers. The mechanical properties (elongation (%), tensile strength (N), modulus of elasticity (MPa)) of composite materials were investigated. The mechanical properties of non-woven surface composites of Cynara scolymus/PET fibers were observed with increases in elongation value, strength value and elasticity modulus values compared to a 100% PET based nonwoven surface. In addition, the contact angle values of nonwoven surface composites based on Cynara scolymus/PET fibers were decreased.Öğe Pavements covered for heat isolation to get pedestrian thermal comfort(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Gökay, Mehmet Kemal; Doğan, Kemal; Yaşar, CihanCivilization has been analyzed mostly with urbanization which coincides with the usage of stone and later concrete and steel in constructions. Nowadays we have been realized that construction materials used for houses, apartments, roads and pavements surrounding us create local microclimate which influences our living comfort. Local temperature increases due to asphalt roads and concrete pavements have recently been determined and they are remarkably effective in our everyday life. Usage of different types of aggregates in concrete mixtures to cast concrete pavement blocks might effective to decrease air temperature on the pavements. Therefore heat-resistant rocks were used to produce different sized aggregates where different plasters were produced from them to coat standard concrete pavement blocks. Pavement blocks plastered were then put under sun to test their surface temperatures. It was observed that heat-resistive materials used in plaster concretes influence heat distribution in the blocks and surface temperature of the concrete pavement blocks.Öğe Design of floating point PI current controller for speed control of IPMSM using FPGA(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Altaey, Abdulhasan; Kulaksız, Ahmet AfşinThe PI Controller can be considered as the essential part for efficient Speed Control of the Interior Permanent Magnet Synchronous Motor. In digital control, two platforms exist to implement this controller, namely DSP and FPGA. The FPGA is more preferred than the DSP due to the concurrent facility. To obtain the full facilities of the digital control and for high accuracy speed control of motors, floating point PI Controller should be used instead of the fixed point. The problem of the FPGA is that it is programmed using VHDL or Verilog which deals only with fixed-point representation. This paper shows a full design of floating-point PI Controller using Altera DE2i-150 platform and Altera Megafunctions. The results are proven using two simulation platforms ModelSim-Altera Starter Edition 15.0 and Matlab Simulink.Öğe Order based emigrant creation strategy for parallel artificial bee colony algorithm(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Aksoy, Alperen; Aslan, Selçuk; Karaboğa, DervişArtificial Bee Colony (ABC) algorithm inspired by the foraging behaviors of real honey bees is one of the most important swarm intelligence based optimization algorithms. When considering the robust and phase divided structure of the ABC algorithm, it is clearly seen that ABC algorithm is intrinsically suitable for parallelization. In this paper, we proposed a new emigrant creation strategy for parallel ABC algorithm. The proposed model named order based emigrant creation strategy depends on sending best food source in a subcolony after modifying it with another food source chosen sequentially from the same subcolony at each migration time. Experimental studies on a set of numerical benchmark functions showed that parallel ABC algorithm powered by the newly proposed model significantly improved quality of the final solutions and convergence performance when compared with standard serial ABC algorithm and parallel ABC algorithm for which the best food sources in the subcolonies directly used as emigrants.Öğe Dynamic analysis of structures which are inspired by lattices of metals(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Güler, Serkan; Yıldız, MuratDesign of structures that are inspired by the Nature is gaining attention in the latest year and many studies on the lattices of the materials are being conducted. And for designing, beams and truss structures are widely used elements. Thus, when designing new structures, getting inspired by those lattices and making use of those beams and trusses might prove to be advantageous. Maintaining the estimated lifetime of the structures is also an essential factor. So, it is essential to determine the characteristics of the structures such as the deflection, stresses and more. When determining those structures, finite element analysis can be used effectively. In this study, the lattice inspired models were constructed. Inverted L-frames, inverted U-frames and 3D frames were designed by using those models. Then to analyze those structures, finite elements method was used. The frames were subjected to four different input forces which were generated by using their total weight multiplied by 10, 20, 50, 100 coefficients. The results demonstrated that these designed structures can be used in many areas such as aviation, space, construction. Also, those structures can be used as the core part of the sandwich composites.Öğe Estimation of unbalance cost due to demand prediction errors using artificial neural network(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) Tümer, Abdullah Erdal; Yavuz, Cankat; Koçer, SabriEstimation of energy demand is used as an important tool for decision makers determining company strategies and policies. Apart from this, the fact that the actual consumption differs from the forecast is harmful for the economy of the company and even for the economy of the big scale. In this study, it is aimed to estimate the imbalance aberration caused by demand forecast deviation with Artificial Neural Networks and to evaluate its results.Öğe Performance comparison of different sized regions of interest on fish classification(Selçuk Üniversitesi Teknik Bilimler Meslek Yüksekokulu, 2018) İşçimen, Bilal; Kutlu, Yakup; Turan, CemalIn this study, different sized regions of interest were obtained from fish images and these were used for fish species classification. A previously proposed region of interest obtaining method was upgraded in order to acquire wider regions of interest. Depending on general accuracies of classification performances, comparison between these regions of interest was made. According to comparison results the effects of the different sized regions of interest were discussed for classification purposes of fish species. This study was performed by using a database which consists of 1321 fish images. These fish images include fish samples from 16 fish families and 35 fish species. All images were colored in RGB color space. But two different feature sets were extracted for fishes by examining images both in RGB and HSV color spaces. Feature extraction was performed by using a color based method. For each color space, seven statistical features were extracted from each component of the color space. Two feature sets were acquired for each fish sample by combining the extracted statistical features according to color spaces. The obtained feature sets from RGB and HSV color spaces were used separately for classification purposes. Classification was performed according to families and species by using Nearest Neighbor algorithm as classifier. According to classification results, the best performances on general accuracies were achieved as 93.5% and 91% for fish families and species classification respectively.
