there is an ongoing discussion on the calculation of the 1D TRAC (like in ECE R135, WS Dummy certification) displacement
from a 3D MTRAC in the WS.
The ancorage point of the 1D TRAC on the spine was different as in the current 2D and 3D devices.
So the current 2D instrumentation can only deliver an estimation of the 1D length change/deflection as the second rotation (ANX) is missing.
For the coding of the channels we have now the dilemma that we can not clearly distinguish between the measurements:
1D: compression was named "DSY" (DSY_1D) (see figure WS: ISO_WS_3_162p2)
- 2025-02-25 17_42_26-XnView - [ISO_WS_3_162p2_20170420.emf].png (25.61 KiB) Viewed 4050 times
2D: length DC0 + ANZ -> DSY (DSY_2D) for EuroNCAP and also change in length DS0 (used as 1D "equivalent" sometimes;
see figure WS: ISO_WS_2_162p2)
- 2025-02-25 17_43_45-XnView - [ISO_WS_2_162p2_20170420.emf].png (27.1 KiB) Viewed 4050 times
Now the coding question is, how to code the potential measurements from a 3D-MTRAC device.
3D: DC0, ANZ, ANX -> can deliver based on calculation DSY_1D equivalent, but also a DSY_2D
How to name these channels? Both are a "DSY" variant.
The topic is also related to the coding for RIBEye:
see viewtopic.php?p=1382
Kind regrads,
Dirk