The draft agenda was approved with additions (see WCWID-2-01):
5.b. Proposal from Japan
IV-NIC=1.1 is correlated with AIS1+=50% and WAD2+=82.9%. This is how the proposed limits for NIC, upper and lower neck forces and moments were derived.
BL raised a concern with regard to the 82.9% risk of WAD2+ neck injuries. If the group shall bring the proposal to GRSP, one of the contracting parties may ask why we accept a risk of approx 83% for an injury. For someone who is not familiar with the group’s discussion this risk might sound very high. This could lead to the question how the proposed criteria would correlate with a 50% WAD2+ risk or even lower. He said that the group needs to be prepared for such type of discussion within GRSP or even WP.29.
It might be better to relate the proposed limits for the criteria to something where the risk “sounds” lower (e.g. PMI or something else). This could avoid discussion.
However, Japan showed data (from Anders Kulgren) which showed that there is a reduction of claims about 63% for “Whiplash Seats” (mainly Volvo WHIPS). He also showed that from JNCAP data that there is no good correlation between backset and score (rating). This is not surprising as this is highly depending on seat design. However, it might be of importance for discussions about having a dynamic test as an option if the geometric requirements are passed (as it is in the current GTR).
It was also shown that HIII is not an acceptable tool for whiplash testing (e.g. inverse flexion).
KO was also presenting JNCAP data from the 17.6 kph and 20 kph pulse. The results have improved over time even when the seats are exposed to higher energy. This is also an experience from Euro NCAP.
5.c. New Approach by Chalmers
a) Generate risk functions for the 17 groups included in the Davidsson and Kullgren IRCOBI 2013 paper will be generated. Data will be turned into binomial data by groping the data into better or worse than a state of the art.
This approach can be used not only for NIC but also for Forces and Moments.
JD is aiming to provide this data for the London meeting.
5.d. On Candidate Seat Performance / Injury Criteria for Regulatory Purposes
However, it should be noted that only the seats of the best selling version are tested at Euro NCAP. In general, no special sports seats or high sophisticated luxury seats are tested within the Euro NCAP programme.
Euro NCAP whiplash tests are currently performed in 7 European labs which received “Euro NCAP accreditation”. Different BioRIDs are used which are certified according to the “old” procedure.
Based on the data and by a comparison of the different proposals BL recommends the following limits for further discussion within the GTR 7 group:
BL said that a status was reached where the group could also define something as “good practice” or based on the experience of JNCAP and Euro NCAP (may be IIWPG) set limits for some criteria to set a minimum standard and to sort out very cheap and bad seats (which could have a good geometry).