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Improved thorax behavior of the EUROSID and effects on thorax injury assessment, on the basis of pendulum impacts
Published June 04, 2001 by National Highway Traffic Safety Administration in United States
In 1989, the EUROSID-1 was accepted in the European regulation ECE-R95. After a steady period of use, an upgraded version of this dummy: ES-2 is now considered as a step towards harmonization of side impact occupant regulations. The upgrades to the dummy include, amongst others, a modification of its torso back plate and a change in rib module guidance (piston-cylinder), especially to overcome anomalous rib deflection responses referred to as ""flat-top.''
Presented here are results of lateral and oblique pendulum tests, conducted on the EUROSID-1 and ES-2 to verify the modified torso back plate and to study the responses of three proposed rib module designs for ES-2. Particularly, rib deflections, rib VC responses, and thorax force-deflection responses are analyzed.
The current study primarily addresses sensitivity of the ES-2 thorax to oblique loading. The risk of anomalous rib deflection responses as observed in full-scale vehicle crash tests can be greatly reduced by using a modified torso back plate and by changing the piston-cylinder. Results presented here show that the prototype ""needle bearing type ribs,'' developed jointly by TNO and FTSS, eliminates the risk of flat-top in the pendulum test conditions employed in this study. The adoption of this rib design in ES-2 may, however, require further tuning of the damping in order to meet biofidelity requirements, such that injury risk on the basis of VC can be assessed appropriately.