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    AN ESTIMATION OF IN-CYLINDER PRESSURE BASED ON LAMBDA AND ENGINE SPEED IN HCCI ENGINE USING ARTIFICIAL NEURAL NETWORKS
    (Parlar Scientific Publications (P S P), 2019) Polat, Seyfi; Ozdilli, Ozgur; Cizmeci, Huseyin
    In this study, the in-cylinder pressure predicted based on lambda and engine speed with the ANN method for HCCI engine. In-cylinder pressures obtained at different lambda and engine speeds, constant inlet air temperature (80 degrees C), RON40 (40% iso-octane/60% n-heptane) fuel in a single cylinder, four-stroke, naturally aspirated, port injection HCCI engine. MATLAB ANN program was used for training, validation and testing ofinputs. The crank angle, engine speed, and lambda were used as input values and the in-cylinder pressure was used as the target value. The Levenberg-Marquardt training algorithm was used for the training of inputs. Also, three layers and 10 neurons were used for the training process. The best validation performance was obtained at epoch 535 as 0.000043691 MSE value. The correlation factor of training, validation, and testing between the targets to outputs were obtained at 0.99912, 0.99905 and 0.99893 respectively. The total correlation factor was found at 0.99908. It is observed that there is a high degree of accuracy between the estimation of results and experimental data using the developed ANN model.
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    Design and manufacture of automatic plastic valve welding machine
    (Sage Publications Ltd, 2021) Ozdilli, Ozgur
    Plastic welding method is a widely used technology for the welding of pressure and vacuum bags using plastic valves. Conducting this process with traditional methods creates disadvantages in terms of production speed, product quality and economical aspects. Today, assembly costs make up the majority of total production costs, manufacturers pay more attention to assembly automation and work in this direction in order to reduce costs, speed up the production process and increase efficiency. In this study, it is aimed to design and manufacture a single Automatic Valve Welding Machine that can do all of these operations and integrated automation system instead of cutting, punching and plastic welding process that can be performed with multiple machines and workers. In this context, a new automated machine was designed in 3 D, and engineering analyzes were carried out to manufacture a prototype. In design, the machine has been made suitable for developing technology by using PLC (Programming Logic Controller) and pneumatic system. In addition, static analyzes of the machine were made. With the inclusion of a production-specific automatic controlled plastic welding machine, manufacturing can be done faster, with higher quality, lower costs and less wastage compared to the traditional manufacturing process.
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    Design and thermal performance analysis of different type cylindrical heatsinks
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2021) Ozdilli, Ozgur
    Reducing the junction temperature of a light emitting diode (LED) to a specific temperature is critical for the luminaires' lifetime and illumination performance. To attain a low junction temperature, a reference radial cylindrical heatsink with was constructed. This model was accepted as a starting point, then nine further models were created using various geometric alterations. The three basic versions with 24 channels: Pin Fin (PF), Pin Vawy Fin (PWF), and Cross-Cut Fin (CCF) were produced by milling machine. These three models were numerically analyzed under the identical conditions and experimental results were confirmed. Then the models were compared in depth using numerical analyses of 3W, 7W, and 10W. The CCF-Y model's surface area has expanded by 24%, and its thermal performance has increased by about 5%, thanks to the radial and axial thin channels that were developed.
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    Effect of channel and fin geometries on a trapeze plate-fin heat sink performance
    (Sage Publications Ltd, 2021) Ozdilli, Ozgur; Sevik, Seyfi
    This study aims to achieve a minimum base temperature (or junction temperature) and hence better thermal performance. Trapezoidal curved plate-fin heat sink with dolphin fins and rectangular channel (Model-1) and trapezoidal curved plate-fin heat sink with dolphin fins, cut corner, and rectangular channel (Model-2) were designed and compared with a standard plate-fin heat sink. The effects of fins on the airflow and heat transfer in designed plate-fin heat sinks have been investigated numerically. The numeric results show that the use of fins and small changes in geometry significantly improve the heat transfer rate. Outcomes of the study showed 44-51% and 57-62% convective heat transfer enhancement compared with a standard plate-fin heat sink, without any overall mass augmentation, in Model-1 and Model-2, respectively. The presence of dolphin fins reduces the thermal resistance by up to 30%, which contributes to the overall thermal enhancement of the designed plate-fin heat sinks. Simulation results show that increasing the fins in areas close to the heat source and reducing the non-working areas significantly influence the thermal performance of heat sinks. The results also show that the trapeze plate-fin heat sinks with the different channel-fin geometries are superior to the standard trapeze plate-fin heat sink in thermal performance.
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    INVESTIGATION OF EFFECTS OF VARIABLE BLANKHOLDER FORCE ON DEEP DRAWING PROCESS OF 6082 ALUMINUM ALLOY
    (Parlar Scientific Publications (P S P), 2019) Ozdilli, Ozgur; Erdin, M. Emin; Erdogan, Mehmet
    In this study, effects of various constant and variable blankholder force values on cup shaped cylindrical deep drawing of 6082-T6 aluminum alloy was investigated. Control of process parameters is extremely important for the effective completion of deep drawing process especially in materials in which vast amount of regional deformations occur due to high strength and low formability as in 6082-T6. It is aimed to complete deep drawing process having deep drawing ratio of 2 effectively under various constant and variable blankholder forces by considering analytically and empirically calculated blankholder forces in the literature. For this purpose, a finite element analysis (FEA) procedure which eliminates the negative environmental effects of the physical process caused by the huge amount of power consumption and waste oil generation was executed. In performed FEA studies whose accuracy was controlled via physical experiments; maximum deep drawing height, total deep drawing energy, maximum deep drawing force, average deep drawing force and thickness variation ratio values were improved by controlling the material flow without decrease in deep drawn product quality under various constant and variable blank holder forces.