Comparison of thorax responses between WorldSID-5th and SID-IIs in lateral and oblique impacts

Ikeda, Miwako<sup>1</sup>; Mae, Hiroyuki<sup>1</sup>

Affiliations

¹Honda R&D Co., Ltd. Automobile R&D Center, Japan

Abstract

Recently, enhancing the biofidelity of the WorldSID-5 th percentile adult female dummy (WorldSID-5 th ), which is an acceptable worldwide fifth percentile adult female side impact dummy, has been investigated and incorporating WorldSID-5 th in the GTR no.14 pole side impact as a substitute for SID-IIs is considered. Since the torso design and instrumentation for measuring thorax deflection are different between these two dummies, it is expected that WorldSID-5 th can indicate the improved performance of evaluating thorax injuries.

The aim of this study was to clarify a difference of performance in evaluating severity of thorax injuries between WorldSID-5 th and SID-IIs by comparing thorax responses in lateral and oblique impacts. In order to understand deformations of ribs, thorax impact simulations were conducted by using WorldSID-5th small female dummy FE model v2.0.3 and SID-IIs dummy FE model SBLD v3.3.2, which are developed by Humanetics Innovation Solutions Inc. A 13.97-kilogram pendulum with 120.7 mm face was impacted into two dummies at the speed of 4.3 and 2.0 m/s, similar to the biofidelity test for thorax without arm shown in 49 CFR Part 572, Subpart V. The centerline of the pendulum was aligned at the level of the centerline of the middle thorax rib in the most lateral side of each dummy. The directions of impacts were set to 0° (pure lateral), ±5°, ±10° and ±15°.

Results from SID-IIs simulations in both high and low speed impacts showed that a thorax deflection measured by potentiometers in pure lateral loading is larger than that in oblique loadings. In contrast, thorax deflections measured by 2D IR-Tracc from WorldSID-5 th simulations in high speed impacts were generally constant with loading directions, those in low speed impacts in pure lateral loading are smaller than that in oblique loadings.

According to published papers, it is known that human thorax response shows larger deflections in the antero- lateral oblique loadings than that in the pure lateral loadings. Therefore, WorldSID-5 th is supposed to be able to represent characteristics of human thorax more adequately compared to SID-IIs. Since human thorax response in postero-lateral oblique impacts has not been thoroughly investigated, further validation of WorldSID-5 th will be needed.

It was clarified that WorldSID-5 th can represent human characteristics of thorax response more appropriately than SID-IIs. Furthermore, it was shown that SID-IIs has a possibility of underestimating thorax deflection in oblique impacts. Therefore, it can be expected that the vehicle performance of occupant protection will be enhanced by introducing WorldSID-5 th into side impact test protocols sometime in future.

Links

URL: http://indexsmart.mirasmart.com/25esv/PDFfiles/25ESV-000364.pdf

Cited Works (7)

Year	Entry
2011	Yoganandan N, Humm JR, Pintar FA, Brasel K. Region-specific deflection responses of WorldSID and ES2-re devices in pure lateral and oblique side impacts. Stapp Car Crash J. 2011;55:351-378.
2003	Samaha RR, Elliott DS. NHTSA side impact research: motivation for upgraded test procedures. In: Proceedings of the 18th International Technical Conference on the Enhanced Safety of Vehicles (ESV). May 19-22, 2003; Nagoya, Japan.
2007	Pintar FA, Maiman DJ, Yoganandan N. Injury patterns in side pole crashes. In: 51st Annual Proceedings, Association for the Advancement of Automotive Medicine (AAAM). October 15-17, 2007; Melbourne, Australia.419-433.
2009	Jensen J, Berliner J, Bunn B, Pietsch H, Handman D, Salloum M, Charlebois D, Tylko S. Evaluation of an alternative thorax deflection device in the SID-IIs ATD. In: Proceedings of the 21st International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 15-18, 2009; Stuttgart, Germany.
2008	Kemper AR, McNally C, Kennedy EA, Manoogian SJ, Duma SM. The influence of arm position on thoracic response in side impacts. Stapp Car Crash J. 2008;52:379-420. SAE 2008-22-0016.
2006	Shaw JM, Herriott RG, McFadden JD, Donnelly BR, Bolte JH IV. Oblique and lateral impact response of the PMHS thorax. Stapp Car Crash J. 2006;50:147-167. SAE 2006-22-0007.
2009	Been B, Waagmeester K, Trosseille X, Carroll J, Hynd D. WorldSID small female two-dimensional chest deflection sensors and sensitivity to oblique impact. In: Proceedings of the 21st International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 15-18, 2009; Stuttgart, Germany.

Cited By (1)

Year	Entry
2023	Tesny AC, Fibbi C, Kang YS, Agnew AM, Baker GH, Zaragoza-Rivera Y, Shurtz B, Pipkorn B, Rhule H, Moorhouse K, Markusic C, Malcolm S, Bolte J IV. Evaluation of 5th percentile female ATDs in near-side impact scenarios compared to elderly PMHS. In: Proceedings of the 2023 International IRCOBI Conference on the Biomechanics of Injury. September 13-165, 2023; Cambridge, United Kingdom.160-183.