Design optimization of the S-frame to improve crashworthiness

In this paper, the S-frames, the front side rail structures of automobile, were investigated for crashworthiness. Various cross-sections including regular polygon, non-convex polygon and multi-cell with inner stiffener sections were investigated in terms of energy absorption of S-frames. It was determined through extensive numerical simulation that a multi-cell S-frame with double vertical internal stiffeners can absorb more energy than the other configurations. Shape optimization was also carried out to improve energy absorption of the S-frame with a rectangular section. The center composite design of experiment and the sequential response surface method (SRSM) were adopted to construct the approximate design sub-problem, which was then solved by the feasible direction method. An innovative double S-frame was obtained from the optimal result. The optimum configuration of the S-frame was crushed numerically and more plastic hinges as well as shear zones were observed during the crush process. The energy absorption efficiency of the structure with the optimal configuration was improved compared to the initial configuration.

[1]  Bahram Notghi.  Review of Crashworthiness Capability of Optimum S-shape Structure , 2011 .

[2]  Larsgunnar Nilsson,et al.  Evaluation of response surface methodologies used in crashworthiness optimization , 2006 .

[3]  G. Cheng,et al.  Theoretical prediction and numerical simulation of multi-cell square thin-walled structures , 2006 .

[4]  Dong Zhao,et al.  A comparative study of metamodeling methods considering sample quality merits , 2010 .

[5]  Hasan Kurtaran,et al.  Crashworthiness design optimization using successive response surface approximations , 2002 .

[6]  K Y Jong,et al.  THE APPLICATION OF CRASHWORTHINESS TO THE DEVELOPMENT OF VEHICLE COMPONENTS , 1994 .

[7]  Toshiaki Sakurai,et al.  Prediction of the Crashworthiness of Vehicle Body Aided Computer , 1991 .

[8]  Heung-Soo Kim,et al.  Effect of the cross-sectional shape of hat-type cross-sections on crash resistance of an “S”-frame , 2001 .

[9]  G. Gary Wang,et al.  Review of Metamodeling Techniques in Support of Engineering Design Optimization , 2007 .

[10]  Douglas C. Montgomery,et al.  Response Surface Methodology: Process and Product Optimization Using Designed Experiments , 1995 .

[11]  T. Wierzbicki,et al.  Relative merits of single-cell, multi-cell and foam-filled thin-walled structures in energy absorption , 2001 .

[12]  P. Hosseini-Tehrani,et al.  Two materials S-frame representation for improving crashworthiness and lightening , 2006 .

[13]  Tongxi Yu,et al.  Energy Absorption of Structures and Materials , 2003 .

[14]  Ren-Jye Yang,et al.  Metamodeling development for vehicle frontal impact simulation , 2001, DAC 2001.

[15]  J. Han,et al.  Crashworthiness optimization of S-shape square tubes , 2003 .