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Child Dummies Restrained by an ISOFIX CRS and a Universal CRS in Different Crash Pulses and the Effect of a Crash Pulse on Dummy Accelerations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
Annotation ability available
A 5-point harness type of child seat approved by ECE R44 was studied in this paper. This child seat can be installed either by the ISOFIX anchorages (the ISOFIX CRS) or by a vehicle 3-point seatbelt (the universal CRS). Hybrid III 3-year-old (3YO) dummy restrained by the ISOFIX CRS was used in a vehicle buck sled test. TNO P-series 3-year-old (P3) dummy restrained by the universal CRS was used in a frontal 50kph full rigid barrier (FRB) test. Multi-body models of the two CRSs were developed by using Madymo software and correlated with the two tests. The goals of this study are to compare the performance of the ISOFIX CRS and the universal CRS, to understand the discrepancy of the kinematics of the Hybrid III 3YO and P3 in the multi-body model simulations, and to find the influence factor of a pulse on the dummy responses. Five different crash pulses were used in the Madymo simulations for both the ISOFIX CRS and the universal CRS. The head forward excursion, and the head, chest, and pelvis accelerations of the Hybrid III 3YO restrained by the ISOFIX CRS were lower than those restrained by the universal CRS when being applied by the same crash pulse. The head forward excursion of P3 was about 10 mm greater than that of the Hybrid III 3YO in the simulations of the five crash pulses. Trapzoidal wave approximation (TWA) is a useful method to approximate the crash pulse. TWA pulse has the same dynamic crush and the time when obtaining the maximum dynamic crush with the crash pulse. TWA pulses were calculated based on the five crash pulses. The dummy responses were similar in the simulations of the crash pulse and the calculated TWA pulse. It was found that the dummy accelerations decreased when the rising slope of the TWA pulse decreased.
CitationHu, J., Ma, J., and Fang, J., "Child Dummies Restrained by an ISOFIX CRS and a Universal CRS in Different Crash Pulses and the Effect of a Crash Pulse on Dummy Accelerations," SAE Technical Paper 2012-01-0085, 2012, https://doi.org/10.4271/2012-01-0085.
- Isaksson-Hellman, I., Jakobsson, L., Gustafsson, C. and Norin, H., “Trends and Effects of Child Restraint Systems Based on Volvo's Swedish Accident Database,” SAE Technical Paper 973299, 1997, doi: 10.4271/973299.
- Bell, R., and Burleigh, D., “An Empirical Comparison of the FMVSS 213 and ECE 44.03 Standards for Child Restraints,” SAE Technical Paper 973312, 1997, doi: 10.4271/973312.
- ECE R44 (Revision 2), February 2008.
- Euro NCAP Assessment Protocol-Child Occupant Protection (version 5.1), www.euroncap.com
- C-NCAP Management Regulation (2009 edition), China Automotive Technology and Research Center, June 2009, www.c-ncap.org.cn
- Hu, J., Wang, D., Mellor, M., et al., “Safety Performance Comparisons of Different Types of Child Seats in High Speed Impact Tests,” 2011 ESV conference, 11-0053, June 2011.
- Sherwood, C., Shaw, C., van Rooij, L., et al., “Prediction of Cervical Spine Injury Risk for the 6-Year-Old Child in Frontal Crashes,” Traffic Injury Prevention 4: 206-213, 2003
- Sochor, M., Faust, D., Garton, H., Wang, S., et al., “Simulation of Occipitoatlantoaxial Injury Utilizing a MADYMO Model,” SAE Technical Paper 2004-01-0326, 2004, doi:10.4271/2004-01-0326.
- van Rooij, L., Sherwood, C., and Crandall, J., “A Comparison of the Injury Risk for 12-Month-Old Children in Forward and Rearward Facing Seats and the Effect of a Front-Row Seat,” TNO MADYMO Fifth Users' Meeting of the Americas, 2003.
- van Rooij, L., Sherwood, C., Crandall, J., Orzechowski, K., et al., “The Effects of Vehicle Seat Belt Parameters on the Injury Risk for Children in Booster Seats,” SAE Technical Paper 2003-01-0500, 2003, doi:10.4271/2003-01-0500.
- Kapoor, T., Alterhof, W., Emam, A. and Howard, A., “A Comparison of the Head and Neck Injury Parameters on a TNO P3 and a Three-Year-Old Hybrid III Child Dummies from Numerical Simulations,” SAE Technical Paper 2005-01-1303, 2005, doi:10.4271/2005-01-1303.
- Tanaka, Y., Yonezawa, H., Hosokawa, N., et al., “Responses of Hybrid III 3YO and Q3 Dummies in Various CRSs Tested Using ECE R44 Impact Conditions,” 2009 ESV conference, 09-0242, 2009.
- Huang, Matthew, “Vehicle Crash Mechanics,” SAE International, CRC Press, ISBN 0-7680-0906-5: 85-146, 2002.
- Hu, J., and Mizuno, K., “The Kinematic Behaviour and Responses of Hybrid III 3YO Dummy and Child Human FE Model in ISOFIX CRS in Frontal Impact,” International Journal of Crashworthiness 14 (4): 391-404, August 2009.