期刊
THIN-WALLED STRUCTURES
卷 75, 期 -, 页码 8-17出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2013.10.022
关键词
Foam-filled structure; Multi-cell thin-walled structure; Crashworthiness; Optimization design; Finite element method
资金
- National Natural Science Foundation of China [11302075, 11002052, 11072074]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120161120009, 20120161130001]
- Open Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body [31275006]
- Young Teacher Development Plan of Hunan University
- National Science Fund for Distinguished Young Scholars in China [11225212]
- National Science and Technology Support Program [2012BAH09B02]
- Science Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body [71275003]
- Hunan Provincial Natural Science Foundation for Creative Research Groups of China [12.117001]
Foam-filled thin-walled structure and multi-cell thin-walled structure both have recently gained attentions for their excellent energy absorption capacity. As an integrator of the above two kinds of thin-walled structures, foam-filled multi-cell thin-walled structure (FMTS) may have extremely excellent energy absorption capacity. This paper firstly investigates the energy absorption characteristics of FMTSs by nonlinear finite element analysis through LS-DYNA. Based on the numerical results, it can be found that the FMTS with nine cells has the most excellent crashworthiness characteristics in our considered cases. Thus, the FMTSs with cell number n=9 are then optimized by adopting a multi-objective particle swarm optimization (MOPSO) algorithm to achieve maximum specific energy absorption (SEA) capacity and minimum peak crushing force (PCF). During the process of multi-objective optimization design (MOD), four kinds of commonly used metamodels, namely polynomial response surface (PRS), radial basis function (RBF), Kriging (KRG) and support vector regression (SVR) for SEA and PCF, are established to reduce the computational cost of crash simulations by the finite element method. In order to-choose the best metamodel for optimization, the accuracies of these four kinds of metamodels are compared by employing the error evaluation indicators of the relative error (RE) and the root mean square error (RMSE). The optimal design of FMTSs with nine cells is an extremely excellent energy absorber and can be used in the future vehicle body. (C) 2013 Elsevier Ltd. All rights reserved.
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