Effects of variations in belt geometry, double pretensioning and adaptive load limiting on advanced chest measurements of THOR and Hybrid III

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Eggers, Andre¹; Eickhoff, Burkhard²; Dobberstein, Jan¹; Zellmer, Harald³; Adolph, Thorsten¹

Effects of variations in belt geometry, double pretensioning and adaptive load limiting on advanced chest measurements of THOR and Hybrid III

Proceedings of the 2014 International IRCOBI Conference on the Biomechanics of Injury

Affiliations

¹Federal Highway Research Institute, BASt, Bergisch Gladbach, Germany

²System Engineering, Autoliv B.V. & Co. KG, Elmshorn, Germany

³Virtual Engineering & System, Autoliv B.V. & Co. KG, Elmshorn, Germany
Abstract and keywords

The sensitivity of thorax deflection of the THOR and Hybrid III was evaluated in sled tests. THOR was equipped with 3D-IR Traccs and strain gauges on the ribs, the Hybrid III with multi‐point deflection measurement. The sensitivity regarding changes of restraint parameter like D‐ring position, pretensioning and belt load limiting was investigated.

As an outcome, the regions with maximum deflection are similar for both dummies under same loading conditions. Reduced mid sternum deflection of the Hybrid III with a belt path close to the neck is measured. In contrast, the maximum deflection difference of the Hybrid III is higher compared to lower belt routings. The THOR thorax shows higher differences in deformation by variation of the belt path.

Double pretensioning reduces the deflection of both dummies being higher for THOR. An increased reduction is found in the lower chest area with Hybrid III. THOR shows the highest differences in the upper area. Finally, a step down of belt force leads to a comparable relaxation of both dummies.

In conclusion, the updated THOR is more sensitive to changes in restraint parameters compared to Hybrid III showing potential for capturing a more detailed thorax response in order to develop injury criteria.

Keywords: Chest deflection, Hybrid III, sled tests, thorax, THOR
Links

URL: http://www.ircobi.org/downloads/irc14/pdf_files/40.pdf

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2019	Park H, Cho A, Kim T, Cho M, Lee T, Lee S, Jin W, Lee M. Study on identification of characteristics of thorax of thor-m50 (metric). In: Proceedings of the 26th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 10-13, 2019; Eindhoven, Netherlands.
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2018	Mroz K, Pipkorn B, Sunnevång C, Eggers A, Bråse D. Evaluation of adaptive belt restraint systems for the protection of elderly occupants in frontal impacts. In: Proceedings of the 2018 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2018; Athens, Greece.60-75.
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