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| Design of bus crash safety based on reliability optimization |
| 1. Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle, Education Department of Hunan Province, Changsha University of Science and Technology, Changsha, Hunan 410004, China; 2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, Hunan 410082, China |
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Abstract In order to improve the safety in frontal collision for the domestic fully integral bus, according to the material property requirements, the frontal impact finite element simulation model was established by the finite element method. The octagonal energyabsorbing structure was installed in the front of bus body, and finite element method, experiment design, response surface method, reliability theory and optimization algorithm were combined to design the reliability optimization of octagonal energyabsorbing structure. The designed results were compared with those from deterministic optimization. The results show that the installing of octagonal energyabsorbing structure in the front of bus body can significantly improve the security in frontal collision. The two kinds of optimization methods can further improve the safety performance. Compared with deterministic optimization method, the energy absorption is decreased by 4.3% by the reliability optimization with acceleration decreased by 16.05% and reliability increased by 19.33%. The reliability optimization design of octagonal energyabsorbing structure can better meet the security requirement in frontal collision.
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Received: 22 April 2016
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2017, Vol. 38 
