Japan new car assessment program for minor neck injury protection in rear-end collisions

Ikari, Takahiro; Kaito, Kenichi; Nakajima, Taichi; Yamazaki, Kunio; Ono, Koshiro

Affiliations

¹National Agency for Automotive Safety and Victims’ Aid (NASVA), JAPAN

²Japan Automobile Research Institute (JARI), JAPAN

Abstract

The JNCAP intends to introduce a minor neck injury protection performance evaluation test method within the JNCAP program. Our research began with a 4-year project in 2005. In the first year, we conducted rear-end vehicle collision tests using a MDB to ascertain vehicle rear crash characteristics. In the second year, we conducted crash tests to allow changing the test conditions such as braking effect and excluding the influence of the MDB honeycomb. Basic data collected included floor G during a crash and measurement of the dummy injury level. In the third year, we conducted dynamic component sled tests to select an actual vehicle crash test or sled test. As a result, we found that the vehicle seat structure has a greater influence on the results than the vehicle structure. Additionally, in examining the sled acceleration pulse which represents the vehicle crash, we found that the crash characteristics of recent vehicles exhibited a triangular pulse rather than a trapezoidal pulse in the actual rear-end vehicle crash test. Delta-V is determined based on the cumulative figures for the rear-end crash accident speed rate. In the final year, all research results and conclusions were incorporated in our test protocol, and trial tests were conducted using the draft test procedure, which consists of the dynamic component sled test with a generic triangular pulse of delta-V=20 km/h. Effective evaluation indices will be finalized using recent biomechanical information. We will then publish all research results and present our final proposal.

Links

URL: http://www-nrd.nhtsa.dot.gov/pdf/esv/esv21/09-0364.pdf

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Cited By (6)

Year	Entry
2011	Nakajima T, Yamazaki K, Ono K, Sawada M; JAMA Rear-impact Neck Injury Evaluation Sub-Group. Study on impact response (injury value) variation factors for BioRID-II dummies. In: Proceedings of the 22nd International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 13-16, 2011; Washington, DC.
2009	Ono K, Ejima S, Yamazaki K, Sato F, Pramudita JA, Kaneoka K, Ujihashi S. Evaluation criteria for the reduction of minor neck injuries during rear-end impacts based on human volunteer experiments and accident reconstruction using human fe model simulations. In: Proceedings of the 2009 International IRCOBI Conference on the Biomechanics of Impact. September 9-11, 2009; York, UK.381-398.
2012	Nakajima T, Yamazaki K, Ono K, Kadotani Y, Sawada M. Calibration test method for enhancing the BioRID‐II dummy’s repeatability and reproducibility. In: Proceedings of the 2012 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2012; Dublin, Ireland.540-651.
2014	Kang Y, Moorhouse K, Icke K, Herriott R, Bolte J IV. Head and cervical spine responses of post mortem human subjects in moderate speed rear impacts. In: Proceedings of the 2014 International IRCOBI Conference on the Biomechanics of Injury. September 10-12, 2014; Berlin, Germany.268-285.
2019	Kang Y-S, Moorhouse K, Bolte JH IV. Head trajectories of post mortem human surrogates in moderate-speed rear impacts. In: Proceedings of the 2019 International IRCOBI Conference on the Biomechanics of Injury. September 11-13, 2019; Florence, Italy.102-118.
2021	Kang Y-S, Millis W, Thomas C, Stricklin J, Willis A, Pradhan V, Tesny A, Kwon HJ, Ramachandra R, Moorhouse K. Head-to-T1 relative rotation of the BioRID-II, Hybrid III, and post mortem human subjects with increased backsets in moderate-speed rear impacts. In: Proceedings of the 2021 International IRCOBI Conference on the Biomechanics of Injury. September 8-10, 2021; Online.732-752.