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2018 RAYLI SİSTEMLERDE KULLANILAN BİR AĞIR HİZMET DİZEL MOTORU SİLİNDİR GÖMLEĞİ ÜZERİNE UYGULANAN FARKLI KAPLAMA MALZEMELERİNİN AŞINMA DAVRANIŞLARININ İNCELENMESİ

Yük ve yolcu taşımacılığında Raylı Sistemler Teknolojisi’ni kullanma eğilimimiz gün geçtikçe artmaktadır. Bu eğilimin artmasındaki en önemli sebep, enerji ve zaman verimliliği açısından Raylı Sistemler Taşımacılık Sistemleri’nin diğer taşımacılık sistemlerine göre önemli avantajlara sahip olmasıdır. Dizel elektrikli lokomotiflerde işin yapılmasını ve sonuçlanmasını sağlayan enerjinin temel kaynağı ağır hizmet dizel motorlarıdır. Dolayısıyla dizel motorların verimini arttırmak, bakım ve onarım maliyetlerini minimum seviyeye indirmeye çalışmak çok büyük önem arz etmektedir. Bu çalışmada Raylı Sistemlerde kullanılan bir ağır hizmet dizel motorunun silindir gömleği tribolojik olarak incelenmiştir. Motor içi sürtünme ve aşınma kayıplarının önemli bir bölümünü oluşturan silindir gömleği aşınma mekanizması incelenerek kaplama metoduyla silindir gömleği aşınma davranışlarının iyileştirilmesi hedeflenmiştir. Bu kapsamda, silindir gömleğinden örnek numuneler alınarak üç farklı kaplama malzemesi (Cr3C2-NiCr, NiCr, Al2O3- TiO2) ile termal sprey kaplama yöntemiyle kaplanmıştır. Kaplama işleminin ardından yapılan aşınma deneyleri neticesinde aşınma oranı 0,03mm3/Nmx10-3 hesaplanan Al2O3-TiO2 kaplama ve aşınma oranı 0,04 mm3/Nmx10-3 olarak hesaplanan Cr3C2-NiCr kaplama en iyi aşınma dayanımı davranışlarını gösterirken, NiCr kaplamanın aşınma oranı 0,06 mm3/Nmx10-3, kaplamasız numunenin aşınma oranı ise 0,09 mm3/Nmx10-3 olarak hesaplanmıştır. The tendency to use Railway Systems Technology in passenger and good transportation has been increasing day by day. The most critical reason of this increase is that Railway System Transportation has important advantages in terms of energy and time productivity compared to other transportation systems. The main source of energy that enables the work to be performed and resulted in diesel electricity locomotives is heavy duty diesel engines. Therefore, to increase the efficiency and to minimize the maintenance and repair cost of diesel engines are very important. In this study, cylynder liner of heavy duty diesel engine used in Railway Systems examined tribologically. It is aimed to improve the wear behaviors of cylinder liners via coating methodology by examining the wearing mechanism of cylnder liner that constitutes big part of friction and wear losses in the engine. In this scope, three samples that were taken from cylinder liner were coated with three different coating materials (Cr3C2-NiCr, NiCr, Al2O3- TiO2) by using thermal spray coating proccess. As a result of the wear experiments following coating process, wear rate of NiCr coating has been calculated as 0,06 mm3/Nmx10-3, wear rate of the uncovered sample is 0,09 mm3/Nmx10-3; while the best wear behaviors are observed as of Al2O3-TiO2 which has the wear rate of 0,03 mm3/Nmx10-3 and as of Cr3C2-NiCr coating which has the wear rate of 0,04 mm3/10-3.

International Symposium on Railway System Engineering
ISERSE

Onur BIYIKLIOĞLU Mustafa Ertunç TAT

320 242
Subject Area: Materials Science Broadcast Area: International Type: Oral Paper Language: English
2017 High Efficient Maximum Power Point Tracking with The Peak-Current-Mode-Controlled Interleaved SEPIC with Coupled Inductor

A SEPIC (single-ended primary inductance converter) DC-DC converter has become popular in recent years particularly some applications where output voltage may be above or below the converter input voltage. In this paper, the interleaved SEPIC converter with coupled inductors is designed and employed in photovoltaic (PV) system applications for maximum power point tracking. The interleaved SEPIC is constructed as two parallel conventional converter module. Thus, the controller generates two PWM control signals with 180 degrees out of phase. In the designed SEPIC, the peak-currentmode controller is employed to control each inductor current according to inductor current references (IL1 and IL2). The sum of the inductor currents is the input (PV) current. In this study, MPPT process is realized the reference voltage (Vref) generated from MPPT algorithm is directly applied the PI controller, and thus ILref is obtained for peak-current-mode-controller. The system is analyzed for sudden irradiation varying conditions and sudden load change. Simulation results show that the proposed converter is very efficient in the MPPT process and has a fastdynamic response due to the peak-current-mode-controller and the PI controller.

1.st International Conference Energy Systems Engineering
ıcese'17

Onur BIYIKLIOĞLU Murat Ünlü Sabri Çamur

385 284
Subject Area: Engineering Broadcast Area: International Type: Oral Paper Language: English