Presentation from Mr Bortenschlager, PDB (GTR7-07-02):

Mr Bortenschlager presented an update to the repeatability and reproducibility work presented at ESV 2009 (09-0492). Dummy D006 and D007 from that work were identified as being outliers for reproducibility when used in the hard bucket seat with the SRA-16 (Euro NCAP low) pulse. A test matrix including repeated certification and sled testing was presented. All dummy measurements were reportedly similar for both dummies, except upper neck My and lower neck Fz. Upper neck My performance shifted with dummy adjustment, but the magnitude of variation between the dummies was unchanged. The lower neck Fz difference between dummies was unchanged with dummy adjustments.

It was confirmed that all of the data presented were from the most recent test series (not from the original programme). The data will be made available for interested parties. The certification test results for both dummies at each stage of the test programme were
presented. It was noted that there was no significant difference in dummy certification performance after adjustment to the latest criteria, which led to the conclusion that the certification tests did not identify a difference between the two dummies, although a difference was apparent in SRA-16 hard bucket seat tests.

Mr Bortenschlager had observed that skull cap friction has a large effect on neck moments, and that jacket stiffness also affects the moment. It was noted that there was very thin padding on the head restraint of the hard bucket seat.

An open question is how to adjust the dummy if a difference is noted in the certification tests.

In this programme, different combinations of certification test were performed at each stage of the programme, so it is not known whether the heavy impactor with-HR test would identify dummy differences.

There was some discussion about the difference between the SRA-16 and Euro NCAP mid pulse (the one proposed for GTR-7). It was noted that the upper neck moments are very low with the SRA-16 pulse and that CV tends to accentuate differences for low values. Humanetics suggested that the dummy seems to perform better when exposed to higher pulses and it was felt that it would be interesting to check these dummies with the Euro NCAP mid-pulse.

Action PDB to distribute pictures of the hard bucket seat test set-up for clarification.