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International Journal of Automotive Technology > Volume 22(5); 2021 > Article
International Journal of Automotive Technology 2021;22(5): 1319-1335.
COLLABORATIVE OPTIMIZATION OF VEHICLE CRASHWORTHINESS UNDER FRONTAL IMPACTS BASED ON DISPLACEMENT ORIENTED STRUCTURE
Xi Liu1, Rui Liang2, Yuanzhi Hu1, Xuebang Tang2, Christophe Bastien3, Ruibin Zhang2
1Chongqing University of Technology
2Guilin University of Aerospace Technology
3Coventry University
PDF Links Corresponding Author.  Rui Liang , Email. ruiliang@guat.edu.cn
ABSTRACT
Frontal impacts are the most frequent crash types and may generate extreme body in white (BIW) deformations. Vehicles are subjected to impact evaluation rating protocols such as 100 % Front Rigid Barrier (FRB) impact, 40 % Offset Deformable Barrier (ODB) impact and 25 % overlap (small overlap) impact. This paper proposes a collaborative optimization process using optimal Latin hypercube design (Opt LHD) and response surface methodology (RSM), to improve the vehicle crashworthiness in the frontal impacts, by considering displacement oriented structure (DOS). Upper and lower engine bay structure were considered herein to increase the lateral vehicle displacement during small overlap impact and decrease the impact force that transferred to the passenger compartment in the frontal impacts. The optimal results indicated that the acceleration of the B-pillar was reduced 0.4g in the FRB impact, the intrusion of the firewall was reduced by 55.13 % in the ODB impact, and the intrusion of passenger compartment during small overlap impact was decreased by an average of 53.88 %, with a maximum percentage of 71.41 % around left toepan, leading to an IIHS rating to acceptable from poor. The proposed crashworthiness design approach is effective in vehicle structure optimization for better frontal impacts performance.
Key Words: Collaborative optimization, Vehicle crashworthiness, Frontal impacts, Displacement oriented structure, Lateral translation
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