When evaluating either measurements made with accelerometers not located at the CG or occupant exposure, we recommend using the msmac3D Tool smacthp to assist in your evaluation.
From Help->Getting Started
->Demos and tutorials section
->Smacthp with ricsac2
smacthp provides a direct way to compare the accelerations/deltaV’s for accelerometers at locations other than the CG
And FYI if you don’t know the exact location of either the accelerometer or the occupant you can try different locations and see how much it changes the max acceleration and the deltaV
smacthp is a great tool to demonstrate the differences in accelerations and deltaV’s due to location
It can help demonstrate why occupants (or accelerometers) see different DeltaVs for different locations (and therefore different possible injuries)
Different people experience different issues for the SAME accelerations
Due to positional differences, the accelerations may be different, so the differences in injuries might be more dramatic.
Of course there is a HUGE difference in accelerations/deltaVs in the event an occupant is in the crush zone, link a near side occupant in a side impact, where the deltaV for the occupant can be approaching the closing speed
And one aside about SMAC:
SMAC initially used the threshold of acceleration > 1 G to start DeltaV calculations and once it came back down below 1 G to end the DeltaV calculations.
In initial development logic had to be added to handle momentary blips in the acceleration! Etc.
Now that we’re working in 3D and we may have to rethink that logic
weight transfer after a collision may extend the acceleration > 1 G longer
What about the 1G threshold? Might we revisit that and make it lower? Or higher?
We are in the process of reconsideration of the default thresholds but in the meantime simply use the msmac3D Tool smacthp to consider different thresholds.
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