Demiryolu araçlarının mekanik mühendisliği açısından en kritik parçası bojidir. Boji, masif yüklere maruz demiryolu araçlarının hareket, yük taşıma ve sönümleme işlemlerini yerine getirir. Kaynaklı çelik konstrüksiyondan imal edilen bojilerde yapı malzemesi olarak karbonlu çelik malzemeler tercih edilmektedir. Bu çalışmada, boji malzemesi için S235, S275 ve S355 malzemeler dikkate alınarak en uygun karbonlu çelik alaşımının belirlenmesi amaçlanmıştır. Malzeme seçiminde; emniyet katsayısı maksimizasyonu, birim fiyat minimizasyonu ve kaynak edilebilirlik maksimizasyonu hedef fonksiyonlar olarak dikkate alınarak optimizasyon problemi modellenmiştir. Modelin çözümü için çok kriterli karar verme yöntemlerinden olan TOPSIS ve VIKOR algoritmaları kullanılmıştır. Elde edilen sonuçlar birinci derecede en uygun malzemenin S355 çeliği, ikinci derecede en uygun malzemenin ise S275 çeliği olduğunu göstermektedir. Ayrıca S355-S275 kombinasyonu ile gerçekleştirilecek konstrüksiyonun çok daha iyi sonuçlar vereceği belirlenmiştir.
With technological developments and carbon emission reaching dangerous levels in the world, it is inevitable that electric vehicles will become the dominant transportation technology of the future. Studies on electric vehicles have become very popular today. In the automotive sector, sectoral dynamics and needs are rapidly changing; restrictions and demands are bound by strict rules and high value-added innovative studies are applied intensively. Supporting this area with academic data will contribute to research and development activities in this field. In this study, analysis and production studies were performed on a 3-wheeled vehicle chassis driven by electric energy. The chassis structure was designed and analyzed with details. The chassis aimed to be produced as a result of the study was analyzed in detail according to brake, modal and cornering analysis. As a result of these analyses, it was found that this chassis has a reliable structure according to the specified driving dynamics parameters. By adopting new requirements, technologies and analysis outputs for the system, a modular platform structure that can be used for various applications were created. The design and production processes of an innovative and applicable chassis structure for the electric vehicle ecosystem are given in detail.
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