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Railways require high investment costs and need continuous and controlled monitoring for defects on the surface and inside the rail material. The existing nondestructive methods for crack detection are commonly based image processing. This study provides a comparison of the existing methods, and presents a new method to detect cracks also based on image processing. The present approach utilizes the fuzzy logic coupled with the peridynamic differential operator. Its robustness is demonstrated by detecting cracks in an image of a rail with cracks.

International Symposium on Railway System Engineering
ISERSE

Cihan Mizrak Erdogan Madenci Yusuf Yurekli Fatih Pehlivan

The objective of this study is to generate two degree of freedom (2-DOF) rail vehicle model and to effectively determine vibration characteristic of the model. Firstly, two degree of freedom mathematical models were formed and equations of motion were obtained to examine vertical vibration of vehicle model. After getting equations of motion, vibration analysis was performed using MATLAB-SIMULINK. Then, the solid model of two degree of freedom rail vehicle model was created by means of computer aided design software. Afterwards, solid model created in the previous section was transferred to ADAMS dynamic analysis software and by selecting appropriate joints, degree of freedom constraints of parts were determined. Finally, created model was performed in vibration analysis. According to analysis results, vertical axis vibration values of ADAMS model were compared with two degree of freedom MATLAB model and it was seen that results are in good agreement with each other. It was determined that the error rate between ADAMS model and two degree of freedom MATLAB model is 1.12 %.

International Symposium on Railway System Engineering
ISERSE

Kerim Gökhan Aktaş Fatih Pehlivan İsmail Esen Cihan Mizrak

Purpose of the paper is to design a basic two degree of freedom (2-DOF) rail vehicle model in SOLIDWORKS software, to analyze vertical vibrations of the designed model in Motion Interface of the software and to show the result is almost same with the result obtained by transfer function of the system. In this study, to obtain dynamic response was used vertical harmonic excitations supplied by slider-crank mechanism. Transfer function of the system was generated after getting equations of motion and then the dynamic analysis was done by using SOLIDWORKS Motion Interface. As a result, displacement, velocity and acceleration graphs taken from both methods were compared and this comparison showed that the period values of both methods were exactly same after equilibrium position and the amplitudes values of both methods had the same results by a maximum error of 0.87%.

International Symposium on Railway System Engineering
ISERSE

Fatih Pehlivan Kerim Gökhan Aktaş İsmail Esen Cihan Mizrak

A fuzzy logic (FL) simulation was used to estimate surface roughness values (Ra) for an n-type single crystalline Silicon (c-Si) ingot cutting operation with a Diamond Wire Saw (DWS) cutting machine. The three parameters affecting surface quality: spool speed, z axis speed and oil ratio in a coolant slurry were assumed as input data for DWS cutting operation. Other parameters such as wire tension, wire thickness, and work piece diameter were assumed as constant. The DWS cutting machine performed 28 cutting operations with different values of the selected three parameters and new cutting parameters were derived for different cutting conditions to achieve the best surface quality by using FL. Wafers 400 μm thick were cut from a same n-type c-Si ingot in a STX 1202 DWS cutting machine. Ra values were measured three times from different regions of the wafers. In present study Ra values corresponding to the cutting parameters, and proper cutting parameters for specific Ra values were determined for DWS cutting using FL.

International Symposium on Industry 4.0 and Applications
ISIA

Savaş Öztürk Cihan Mizrak Erhan Kayabasi Hüseyin Kurt Erdal Çelik