Whiplash Testing Protocol - Euro NCAP

values. Maxima for each of the four components should be calculated, considering only the portion
of data from T-zero until T-HRC(end), as follows:
The Nkm value is taken as the maximum value reached by any one of the four components N ea , N ep ,
N fa , N fp .
It should be noted which component of the four reached the maximum value and the time at which
this occurred.
11.7 Seatback Dynamic Deflection
Using a suitable target tracking film analysis technique, measure the seatback dynamic opening from
the targets defined in Figure 15 and Table 3 as follows:
- Define a line between the upper and lower seatback targets, ST2 and ST3.
- Define a second line between the forward and rearward sled base targets, B1 and B2.
Calculate the angle between these two lines at the T-zero position. The instantaneous seatback
deflection is defined as the instantaneous difference in angle between the T-zero position and the
deflected position. Track the change in instantaneous angle between these two lines, throughout the
dynamic test.
The Seatback Dynamic Opening is defined as the maximum change in angle achieved at any time
during the test between the T zero position and T-HRC(end). Note this maximum angle, and the time at
which it occurred.
For seats with two-point adjusting back, the same seatback deflection criterion will apply using
targets ST2 and ST3, however it is recommended to use the two optional targets ST2‟ and ST3‟ such
that any contribution from deflection in the two point mechanism can be understood.
Version 3.1
June 2011
40