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    Neural Network Modelling of Breaking Force in Variable Road and Slope Conditions
    (WORLD ACAD UNION-WORLD ACAD PRESS, 2011) Kus, Recai; Taskiran, Ugur; Bayrakceken, Huseyin
    Most of the traffic accidents occur when the vehicle could not stop at desired point and time. The most important factors affecting the breaking performance are wheel and road conditions and parts which make up breaking system. Breaking test can be performed as road tests or can be carried out on breaking test equipment. Because road tests require special test areas and long time to complete, experiments performed with test equipment are preferred. The duration of tests and studies can be shortened by modeling experimental results with artificial neural networks (ANN). In this study, breaking outcomes are examined in different roads like linear and side slope roads, in different slipping conditions of the road; differences between the breaking performances are determined and mathematical model based on ANN is developed.
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    PROCESS OPTIMIZATION FOR BIODIESEL PRODUCTION FROM NEUTRALIZED WASTE COOKING OIL AND THE EFFECT OF THIS BIODIESEL ON ENGINE PERFORMANCE
    (ECOPETROL SA, 2018) Eryilmaz, Tanzer; Aksoy, Fatih; Aksoy, Lacine; Bayrakceken, Huseyin; Aysal, Faruk-Emre; Sahin, Seda; Yesilyurt, Murat-Kadir
    In this study, the methyl ester production process from neutralized waste cooking oils is optimized by using alkali-catalyzed (KOH) single-phase reaction. The optimization process is performed depending on the parameters, such as catalyst concentration, methanol/oil ratio, reaction temperature and reaction time. The optimum methyl ester conversion efficiency was 90.1% at the optimum conditions of 0.7 wt% of potassium hydroxide, 25 wt% methanol/oil ratio, 90 min reaction time and 60 degrees C reaction temperature. After the fuel characteristics of the methyl ester obtained under optimum conditions were determined, the effect on engine performance, CO and NO,, emissions of methyl ester was investigated in a diesel engine with a single cylinder and direct injection. When compared to diesel fuel, engine power and torque decreased when using methyl ester, and specific fuel consumption increased. NOx emission increases at a rate of 18.4% on average through use of methyl ester.