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中南大学学报(英文版)

Journal of Central South University

Vol. 21    No. 6    June 2014

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Multi-objective optimisation of a vehicle energy absorption structure based on surrogate model
XIE Su-chao(谢素超)1, ZHOU Hui(周辉)2

1. Key Laboratory of Traffic Safety on Track of Ministry of Education
(School of Traffic and Transportation Engineering, Central South University), Changsha 410075, China;
2. School of Transportation and Logistics, Central South University of Forestry and Technology,
Changsha 410004, China

Abstract:In order to optimize the crashworthy characteristic of energy-absorbing structures, the surrogate models of specific energy absorption (SEA) and ratio of SEA to initial peak force (REAF) with respect to the design parameters were respectively constructed based on surrogate model optimization methods (polynomial response surface method (PRSM) and Kriging method (KM)). Firstly, the sample data were prepared through the design of experiment (DOE). Then, the test data models were set up based on the theory of surrogate model, and the data samples were trained to obtain the response relationship between the SEA & REAF and design parameters. At last, the structure optimal parameters were obtained by visual analysis and genetic algorithm (GA). The results indicate that the KM, where the local interpolation method is used in Gauss correlation function, has the highest fitting accuracy and the structure optimal parameters are obtained as: the SEA of 29.8558 kJ/kg (corresponding to a=70 mm and t= 3.5 mm) and REAF of 0.2896 (corresponding to a=70 mm and t=1.9615 mm). The basis function of the quartic PRSM with higher order than that of the quadratic PRSM, and the mutual influence of the design variables are considered, so the fitting accuracy of the quartic PRSM is higher than that of the quadratic PRSM.

 

Key words: railway vehicle; energy-absorbing structure; surrogate model; Kriging method (KM); polynomial response surface method (PRSM); structure optimization

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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