https://hdl.handle.net/20.500.12619/3933 2026-04-05T03:00:36Z 2026-04-05T03:00:36Z Kapsız, Murat Durat, Mesut Fıçıcı, Ferit https://hdl.handle.net/20.500.12619/3952 2020-01-15T07:24:31Z 2011-01-01T00:00:00Z

Friction and wear studies between cylinder liner and piston ring pair using Taguchi design method Kapsız, Murat; Durat, Mesut; Fıçıcı, Ferit This paper reports an experimental study of tribological characteristics of cylinder liner (CL)/piston ring (PR) pair. Reciprocating wear process parameters are optimized for minimum weight loss and friction based on mixed L(16) Taguchi orthogonal design with three process parameters, sliding velocity, applied load and oil type. It is observed that sliding velocity have the most significant influence on both weight loss and friction characteristics of CL/PR pair. The interaction of sliding velocity and oil type has some significant influence on weight loss of piston ring. The experimental results are in good agreement with the values from the theoretical model. (C) 2011 Elsevier Ltd. All rights reserved.

2011-01-01T00:00:00Z Demirer, Ahmet Durat, Mesut Haşimoğlu, Can https://hdl.handle.net/20.500.12619/3953 2020-01-15T07:24:31Z 2012-01-01T00:00:00Z

Investigation of seat belt use among the drivers of different education levels Demirer, Ahmet; Durat, Mesut; Haşimoğlu, Can Seat belt use habit has been investigated according to the education level of drivers. Copies of a questionnaire were distributed to 1000 participants of four different education levels. Factors such as seat belt usage habit, restricting factors and crash data have been investigated. Data have been analyzed with SPSS 15.0 software. Increased level of education leads to increased seat belt usage, lower numbers of crashes and crash severities. The factors restricting seat belt use are lack of habit, discomfort and short distance driving. The use of precaution signal and increases in comfort can increase seat belt usage. The primary and high school education on traffic safety and seat belt usage has been serving the purpose. (C) 2011 Published by Elsevier Ltd.

2012-01-01T00:00:00Z Durat, Mesut Kapsız, Murat Nart, Ergün Fıçıcı, Ferit Parlak, Adnan https://hdl.handle.net/20.500.12619/3954 2020-01-15T07:24:31Z 2012-01-01T00:00:00Z

The effects of coating materials in spark ignition engine design Durat, Mesut; Kapsız, Murat; Nart, Ergün; Fıçıcı, Ferit; Parlak, Adnan In this study, a steady-state thermal analysis was performed to evaluate the temperature gradients in the standard and two different partially stabilized ceramic coated pistons by using Abaqus (c) finite element (FE) software. A sharp increase in the temperature of the coated area of the piston was observed as a result of FE simulations. It is concluded that the annulus Y-PSZ coating may contribute better, as compared to Mg-PSZ, to decrease the cold start and steady state HC emissions without auto ignition, since the temperature in the area shows a local sharp increase. (C) 2011 Elsevier Ltd. All rights reserved.

2012-01-01T00:00:00Z Durat, Mesut Parlak, Zekeriya Kapsız, Murat Parlak, Adnan Fıçıcı, Ferit https://hdl.handle.net/20.500.12619/3955 2020-01-15T07:24:31Z 2013-01-01T00:00:00Z

CFD AND EXPERIMENTAL ANALYSIS ON THERMAL PERFORMANCE OF EXHAUST SYSTEM OF A SPARK IGNITION ENGINE Durat, Mesut; Parlak, Zekeriya; Kapsız, Murat; Parlak, Adnan; Fıçıcı, Ferit Catalysts of a gasoline engine become active when the exhaust temperature exceeds 200 degrees C. Cold start HCs are extremely high until catalysts reach the light-off temperature. Determination of optimum place necessary time of the catalyst to reach this temperature is of vital importance. Interaction between exhaust gas and inner wall, along with the exhaust pipe needs to be well-understood. The interaction can be computed by numerical solutions based on fluid dynamics and heat transfer equations depending on time and location. In the study, three-dimensional transient CFD analysis has been performed for the whole exhaust pipe. The results of CFD analysis was in very good agreement with those of experimental data. Also, an optimal catalyst location was determined by the CFD analysis performed in transient regime. Heat transfer phenomena were also investigated analytically using different Nusselt number correlations given in the literature. Analytic results were compared with those of the experimental data. Each correlation gave reasonable results with different range of Reynolds number.

2013-01-01T00:00:00Z