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Title: Multi-fidelity crashworthiness optimization of a bus bumper system under frontal impact
Authors: Acar, Erdem
Yılmaz, Burak
Güler, Mehmet Ali
Altın, Murat
Keywords: Bumper system
Crush force efficiency
Energy absorption
Multi-fidelity optimization
Issue Date: Aug-2020
Publisher: Springer
Source: Acar, E., Yilmaz, B., Güler, M. A., and Altin, M. (2020). Multi-fidelity crashworthiness optimization of a bus bumper system under frontal impact. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 42(9), 1-17.
Abstract: In this study, crashworthiness of a bus bumper system with a special honeycomb beam is optimized under impact loading using a multi-fidelity optimization approach. The crash performance of the bumper system is evaluated using two metrics: crush force efficiency (CFE) and specific energy absorption (SEA). An optimization with aggregated objectives is performed to seek for an optimum bumper design. Optimum values of the crashbox length, honeycomb wall angle and honeycomb wall thickness are obtained to maximize composite objective function that provides a compromise between these two metrics. Commercial finite element software LS-DYNA is used to compute CFE and SEA values. Multi-fidelity modeling is used to combine data of low-fidelity model at all training points with high-fidelity data at some randomly selected training points to obtain accurate response predictions in less computational time. It is found that multi-fidelity optimization can reduce the computational cost by 33% with only 2% smaller composite objective function value compared to the high-fidelity optimization alternative.
ISSN: 1806-3691
Appears in Collections:Makine Mühendisliği Bölümü / Department of Mechanical Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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