Abstract
The Flexible Pedestrian Legform Impactor (Flex-PLI) consisting of a flexible femur and tibia will be tested for pedestrian protection by Euro NCAP within the next couple of years as a potential replacement for the Transport Research Laboratory (TRL) legform impactor. The injury risks that are measured when using Flex-PLI are the elongation of the anterior/posterior cruciate ligament (A/PCL), elongation of the medial collateral ligament (MCL), and tibia bending moment (TBM). In this study, we used a correlated computer-aided engineering (CAE) model to conduct a contribution analysis of each injury with regard to the changes in the location of the frontal structures based on the results of a design of experiments (DOE) and analysis of variance (ANOVA). The frontal structures that were selected as control factors were the energy absorber (EA), lower bumper stiffener (LBS), and hood angle. A kriging interpolation model was developed using the DOE results, and its results were compared with those of the CAE model. Furthermore, for robust design optimization, the speed and height of Flex-PLI were used as the noise factors. Finally, a robust design optimization was carried out using the optimal combination of the discrete control factors for minimizing MCL elongation.
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References
Choi, C. H. and Pardede, V. (2011). Reduction of pedestrian injury risks injury mechanism of Flex-PLI. KSAE Annual Conf. Proc., Korean Society of Automotive Engineers. 1948–1954.
Davoodi, M. M., Sapuan, S. M. and Yunus, R. (2008). Conceptual design of a polymer composite automotive bumper energy absorber. ELSEVIER Material and Design, 29, 1447–1452.
Economic and Social Council (2009). Global Technical Regulation Pedestrian Safety. No.9.
European New CAR Assessment Program (2012). Assessment Protocol Pedestrian Protocol Implementation 2014 Version 7.0.
Jeon, Y. E., Moon, H. I., Kim, H. Y., Kim, Y. S. and Gil, H. M. (2011). Crumple zone design and upper legform impactor analysis for pedestrian protection. SAE Int. 28-0115.
Karimullah, S., Gokhale, A., Joshi, S. and Chalipat, A. (2011). Design of lower stiffener for controlling pedestrian lower leg injuries. SAE Symp. Int. Automotive Technology 26-0100.
Kulkarni, S. and Mana, D. (2012). Design of light-weight vehicle front end structure for pedestrian protection. SAE International 01-1176.
Mijuno, K., Ueyama, T., Nakane, D. and Wanami, S. (2012). Comparison of reponses of the Flex-PLI and TRL legform impactors in pedestrian tests. SAE Int. 01-0270. 203–213.
Mizuno, Y. (2005). Summary of IHRA pedestrian safety WG activities. Proc. 19th Int. Technical Conf. Enhanced Safety of Vehicles, 05-0138.
Phadke, S. M. (1989). Quality Engineering using Robust Design. AT & T Bell Laboratories.
Shuler, S., Mooijman, F., Nanda, A. and Surisetty, G. (2005). Improved energy absorber and vehicle design strategies for pedestrian protection. SAE World Cong. 01-1872.
Yun, Y. W., Kim, G. H. and Park, G. J. (2010). Evaluation of usefulness and repeatability for pedestrian protection Flex-PLI. KSAE Annual Conf. Proc., Korean Society of Automotive Engineers. 1530–1536.
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Lee, Y.H., Joo, Y.J., Park, J.S. et al. Robust design optimization of frontal structures for minimizing injury risks of Flex Pedestrian Legform Impactor. Int.J Automot. Technol. 15, 757–764 (2014). https://doi.org/10.1007/s12239-014-0079-6
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DOI: https://doi.org/10.1007/s12239-014-0079-6