Otomobil ön tampon çarpışma analizi ve optimizasyonu
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Date
2008-05-06
Authors
Öztürk, İsmail
Journal Title
Journal ISSN
Volume Title
Publisher
Uludağ Üniversitesi
Abstract
Bu çalışmada, %100 ve %40 offsetli çarpışmaya maruz kalan otomobil ön tampon ve darbe emici sisteminin enerji absorbsiyonu incelenmiştir. Bu amaçla lineer olmayan sonlu elemanlar modeli oluşturulmuş ve Ls-Dyna yazılımı ile çözülmüştür. Deney tasarımı metodu ile yaklaşık tasarım fonksiyonları oluşturulmuş ve toplam ağırlığın minimizasyonu için boyut optimizasyon problemi tanımlanmıştır. Optimizasyon problemi Matlab yardımı ile çözülerek %100 ve %40 offsetli çarpışma durumu için optimum sac kalınlığı bulunmuştur. Bu çalışma ile ayrıca darbe emici üzerinde oluşturulan katlanma başlatıcı geometrilerin toplam enerji absorbsiyonuna etkisinin oldukça az olmasına karşı, çarpma başlangıcındaki maksimum tepki kuvvetlerini önemli ölçüde düşürdüğü gözlenmiştir.
The objective of this study is to investigate the crash energy absorbtion of bumper-crash box system subjected to %100 and 40% offset impact loading. Nonlinear finite element model has been created and impact test was simulated using Ls-Dyna software. Design of experiment method is used to construct approximated design functions then size optimization technique is defined to solve the problem of minimization of the total weight. Matlab was used to solve the size optimization problem and optimum sheet thickness value was determined for the impact condition of %100 and 40% offset. The study also has shown that crushing initiator geometry on the crash box significantly decrease the maximum initial reaction force but its effect on energy absorbing capacity was relatively small.
The objective of this study is to investigate the crash energy absorbtion of bumper-crash box system subjected to %100 and 40% offset impact loading. Nonlinear finite element model has been created and impact test was simulated using Ls-Dyna software. Design of experiment method is used to construct approximated design functions then size optimization technique is defined to solve the problem of minimization of the total weight. Matlab was used to solve the size optimization problem and optimum sheet thickness value was determined for the impact condition of %100 and 40% offset. The study also has shown that crushing initiator geometry on the crash box significantly decrease the maximum initial reaction force but its effect on energy absorbing capacity was relatively small.
Description
Keywords
Tampon, Darbe emici, Çarpışma analizi, Bumper, Crash box, Crash analysis
Citation
Öztürk, İ. (2008). Otomobil ön tampon çarpışma analizi ve optimizasyonu. Yayınlanmamış yüksek lisans tezi. Uludağ Üniversitesi Fen Bilimleri Enstitüsü.