Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2022Scopus SJRQ1/r/munzur/2896
  An interval type-2 fuzzy enhanced best–worst method for the evaluation of ship diesel generator failures

  Yucesan, Melih; Başhan, Veysi; Demirel, Hakan; Gul, Muhammet

  The environmental destruction in our century necessitates the implementation of more safety-based rules and the strict implementation of failure analysis, especially in the maritime sector. The generator system, considered the ship's powerhouse, is expected to be ready and well-maintained for efficient and safe operations. This study proposes a new methodology to analyze ship generator failures. This method includes a version of the best-worst multi-criteria decision-making method enriched with interval type-2 fuzzy logic (IT2FE-BWM). Enrichment with interval type-2 fuzzy numbers shows that a parameter about how much the decision-maker trusts the pairwise comparisons are added to the model. Thus, a more sensitive methodology has been proposed for the confidence of the maritime sector evaluators. A solid decision mechanism has been developed to prioritize generator failures. In addition, a comparison study with some other BWM derivatives and a creative sensitivity analysis were added to this study and its robustness was tested.

  AtıfScopus25·OpenAlex24

  İncele
• MakaleYalnız künye2021Scopus SJRQ1/r/munzur/2995
  Crack failure in hydrodynamically lubricated bearings: A case study hydraulic turbine

  Taşgın, Yahya; Kahraman, Gökhan

  This study investigates the trunnion crack of a 50 MW hydraulic turbine in the generator guide bearing. The crack area has been examined metallographically and the fixing method for the the trunnion crack has been explained. Result of the study shows that the reason for the formation of the bearing trunnion crack can be the thermal stresses that occur during the mounting of the bearing trunnion to the turbine shaft and the material fatigue that occurs during the operation of the hydraulic turbine.

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  AtıfScopus9·WoS7·OpenAlex9

  İncele
• MakaleAçık Erişim2019Scopus SJRQ1/r/munzur/3803
  Identification of optimum working conditions in hydroelectric power plants for cavitation

  Kahraman, Gökhan; Yücel, Halit Lütfi; Taşgin, Yahya

  Turbine faults in hydroelectric power plants not only reduce the operation time of the plant, but also cause a serious loss of income. One of the most important turbine faults is the turbine wheel wear caused by the cavitation and accordingly the other machine equipment faults which cause excessive vibration. In this study, cavitation intensity that the turbines have been exposed in operating conditions has been investigated. As a result of the calculations, optimum working conditions of the units have been determined with graphs obtained in various operating conditions. The obtained data can be easily applied to all hydroelectric power plants exposed to cavitation, and safe operating conditions can be determined.

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  AtıfScopus11·WoS10·OpenAlex13

  İncele
• MakaleYalnız künye2019Scopus SJRQ1/r/munzur/3379
  Research of thermal performance by metallographic investigation of stator winding solder region in hydroelectric power plants

  Kahraman, Gökhan; Taşgın, Yahya

  Hydroelectric power plants are the most widely used renewable energy sources all over the world. In these plants, many studies have been conducted in order to produce energy continuously and efficiently. Among these studies, predictive maintenance methods, efforts to increase power by improving cooling conditions, and improving efficiency by improving the turbine wheel. In this paper, soldering at the junctions of the stator windings in the central generators has been investigated. Traditional solder (Cu–Zn) materials and silver alloy solders (Ag-Cu-Zn) have been investigated in terms of thermal and metallographic. Silver alloy soldering has been found to have lower electrical conductivity than conventional soldering. The winding temperatures measured on the generating generator show that silver alloy soldering is more efficient. Reducing the stator winding temperature in hydroelectric power plants allows more energy production and also reduces costs by preventing winding failures.

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  AtıfScopus2·WoS2·OpenAlex2

  İncele