Person: ERSOY, SEZGİN
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ERSOY
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SEZGİN
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Publication Open Access Vibration analysis of screw-fed systems used in additive manufacturing technology(2022-06-13) ERSOY, SEZGİN; Ersoy S., Kaba M., Ekinli B.Additive manufacturing technology has become quite widespread and produces solutions in many areas. Although it is much more advantageous than machining, this technology continues to be developed every day to increase productivity. In additive production systems with different production processes, it may be necessary to improve the system in order to increase the quality of the products that are desired to increase the sensitivity. In this study, it is aimed to determine the vibration behavior of the screw used in the screw extruder method, which will eliminate the errors caused by the continuous filament technology used in FDM technology in layered production. Keywords: additive manufacturing, screw extrusion, vibration analysis.Publication Open Access Reading and playing musical notes with image processing techniques with mobile application(2022-08-25) ERSOY, SEZGİN; Ersoy S., Özdöşemeci F.The aim of this study is to process the notes on the music sheet, written by hand on the musical note line or edited in the computer environment, with the image processing technique and to play the music over the phone application. This application will be developed with Java in the Android Studio environment and image processing will be done using the OpenCV Library. Detection of a note will be memorized by calculating the value and duration of the note. After these sounds, the frequency values of the notes will be available on the phone.Publication Open Access Air leakage test system for product without atmosphere air connection(2023-06-01) ERSOY, SEZGİN; Temiz I., Feyzioğlu A., Çelebi M. F., Ersoy S.With the air leakage test methods, the leakage tests of the products that are required to be leakproof are carried out. This leakage test starts with placing the product on a fixture. The in-ternal pressure is increased by filling compressed air into the product placed in the Fixture. The product is filled with compressed air up to a previously calculated test pressure value. After the test pressure value is reached for the desired product, the air filling process is completed, and the stabilization period begins. At the end of this period, information about the leakage of the product is obtained, depending on whether there is a change in the internal pressure of the product. In order to fill the product with compressed air, there must be an air hole on the product. Products without this air hole cannot be tested with these methods. With the new method we will develop, it will be possible to test the leakage of closed products without atmosphere-air connection.Publication Open Access Computational model for the nonlinear dynamic response of MEMS-based micromirror(2022-08-25) ERSOY, SEZGİN; Ertuğrul İ., Ersoy S., Ragulskis M.In this study, it is aimed to perform Finite Element Analysis (FEA) of micromirror based on Micro-Electro-Mechanical Systems (MEMS) and to examine the nonlinear and dynamic responses of this system. Micromirror devices are indispensable, especially for optical systems and form the basis of them. In this work, dynamic and nonlinear responses of micromirror with 4 symmetric arms and one reflective surface were investigated. During the design and modeling, it is assumed that the upper and lower layers of the reflective surface have equal tensile and compressive stresses. The analysis of the system was obtained by applying a force of up to 30 GPa Prestressed on the reflective surface. The design and FEA of the micromirror system were made with the Comsol Multiphysics program. The nonlinear response of the analysis was carried out with the MATLAB program. This model, which has the most basic design of micromirror structures used in optical systems, is thought to be a source for a good examination of the nonlinear dynamic model and for understanding more complex structures.Publication Metadata only The fundamentals of metal-matrix composites(NOVA Science Publishers Inc., 2022-01-01) ERSOY, SEZGİN; Ersoy S. (Editör)Developing production technology tries to respond to human needs. Meeting these needs requires the development of new products or an increase in the supply of raw materials. Although polymer-based, recycled, and natural resources are used as raw materials, it does not reduce the importance of metal-based structures. However, there is a need to use these metal-based materials at lower costs or to improve their existing properties. This book offers relational studies to these issues.Publication Open Access Investigation of time-based pressure control for microfluidics chip design(2023-03-01) TOPTAŞ, ERSİN; ERSOY, SEZGİN; ATAKÖK, GÜRCAN; Ersoy S., Atakök G., Khorsandi D., Toptaş E.The emergence of the microfluidic chip was a game-changer in microbiological analysis platforms. This technology, by combining physics, chemistry, biology, and computing, helps researchers to obtain precise results in a shorter time. However, it requires more advancements in order to lessen its limitations. This study presents the design, modelling, and microbiological analysis of a microelectromechanical system (MEMS) based microfluidic chip. Three different microfluidic chips have been developed during the design process. These chips have different inlet channels and one outlet channel. The modelling process was carried out with Multiphysics Software. Pressure and velocity data in micron-sized channels were checked for each system. The flow directions of the fluids in the inlet and outlet channels were observed according to the pressure change. As a result of the analysis, the highest velocity was found in the microfluidic chip with three inlet channels. In comparison, the highest pressure was measured in the microfluidic chip with four inlet channels. These values are 2.36 x10-17 m/s and 13.5 Pa, respectively. The pressure values of the 4 and 5-channel microfluidic chips were very close. The results showed that as the number of inlet channels increased, the pressure value in the microfluidic chip increased, but the velocity value decreased.Publication Open Access Effect of bumper thickness with collision simulation of passenger vehicles(2023-02-01) ERSOY, SEZGİN; Özcan F., Gullu A., Ersoy S.The finite element method is the most common method used to solve engineering and mathematical model problems. Related solution areas include structural analysis, heat transfer, mass transport and electromagnetic potential. FEM is a specific numerical method used to solve partial differential equations in two or three space variables. To solve a problem, FEM breaks up a large system into smaller, simpler parts called finite elements. First, a three-dimensional model of the system to be analyzed is produced. While defining the model, the materials and connection types found in the model are also deter-mined. Afterwards, the model is divided into small parts and analyzed under specified conditions. A crash test will be conducted in this study. For this, the conditions of the vehicle parts will be examined by hitting a wall under the conditions of which the model design of the vehicle is determined. Crash tests were carried out for two different bumper thicknesses on the same vehicle and the test results were examined. The vehicle speed is modeled as 20 m/s in the simulation carried out from the moment of impact until 0.14 seconds later. The effect of buffer thickness on axial displacements at impact and energy changes are presented.Publication Open Access Additive Manufactured Strain Sensor Using Stereolithography Method with Photopolymer Material(2023-02-01) ERSOY, SEZGİN; Ertugrul I., Ulkir O., Ersoy S., Ragulskis M.As a result of the developments in additive manufacturing (AM) technology, 3D printing is transforming from a method used only in rapid prototyping to a technique used to produce large-scale equipment. This study presents the fabrication and experimental studies of a 3D-printed strain sensor that can be used directly in soft applications. Photopolymer-based conductive and flexible ultraviolet (UV) resin materials are used in the fabrication of the sensor. A Stereolithography (SLA)-based printer is preferred for 3D fabrication. The bottom base of the sensor, which consists of two parts, is produced from flexible UV resin, while the channels that should be conductive are produced from conductive UV resin. In total, a strain sensor with a thickness of 2 mm was produced. Experimental studies were carried out under loading and unloading conditions to observe the hysteresis effect of the sensor. The results showed a close linear relationship between the strain sensor and the measured resistance value. In addition, tensile test specimens were produced to observe the behavior of conductive and non-conductive materials. The tensile strength values obtained from the test results will provide information about the sensor placement. In addition, the flexible structure of the strain sensor will ensure its usability in many soft applications.Publication Open Access Discovery of agricultural diseases by deep learning and object detection(2022-01-01) ÇELEBİ, MEHMET FATİH; ERSOY, SEZGİN; Karakaya M., Çelebi M. F., Gok A. E., Ersoy S.In this study deep learning and object detection models for image-based plant disease recognition have been carried. Trained models were tested on pictures and in real-time with a video camera for five different diseases in tomato leaves. Object detection algorithm was implemented from the personal computer, and deep learning models were applied via Google Colab. Real-time object detection was achieved in the developed model with YOLOv5 algorithm with the highest accuracy of 93.38% in validation accuracy and 94.48% in training accuracy with the highest value of 92.96% in precision. Furthermore, it has been observed that YOLOv5 algorithm gives faster and more accurate results than the previous versions of YOLO.Publication Open Access Productivity forecast with digital greenhouse automation system for sustainable agriculture(2022-06-01) ÇELEBİ, MEHMET FATİH; ERSOY, SEZGİN; Gök A. E., Çelebi M. F., Koca A. S., Doğan M., Ersoy S.Greenhouses are a popular agricultural production method by providing artificial climatic conditions. Providing optimum climatic conditions depends on the equipment of the greenhouse. Greenhouse equipment consists of systems such as heating, ventilation, shading, irrigation, and fertilization. In modern greenhouse cultivation, all these have become controllable with smart systems. These modern greenhouses, in other words smart greenhouses, can read the ambient conditions in real-time with their advanced sensor systems and enable processes such as irrigation, adjustment of ambient temperature, and ventilation to be carried out autonomously. In this study, the working principle, general structure, design, and types of equipment used in the greenhouse automation system are explained, and the system is designed and simulated on the Unity Engine.