DeltaV/Accel at location other than CG?

General Crash Reconstruction Tecnhiques
Crash tests, Pole Impacts
MSI
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DeltaV/Accel at location other than CG?

Post by MSI »

From the Crash Forum:
Q: Is there any publication(s) known dealing with the measurement of accelerations (resp. integrated delta-v) in different locations during vehicle crash tests? (E.g. several locations in the passenger compartment or on the chassis.)

A: Related links on this forum: We did a paper on acceleration and Delta-V at locations other than the CG as part of our 4 SAE paper production in 1997.
Here's the paper:
  • It includes in the appendix the derivation and the steps to calculate DeltaV etc at locations other than the CG.
    It also includes results of simulation and comparison of accel and deltaV from the msmac3D simulation with full scale crash tests measurements.
    Of particular interest is RICSAC#10 which has a sideslap and depending on the acceleration location can produce very different results for DeltaV (see below)
ABSTRACT
  • Research performed in the 1970's revealed significant limitations in the available documentation of vehicle crush information and trajectory spinout information. As a result a series of full-scale crash tests were performed which became known as the Research Input for Computer Simulation of Automobile Collisions (RICSAC) crash tests. Previous research using the RICSAC test results, particularly in relation to the validation of accident reconstruction computer programs, has varied widely in acceptance, interpretation and presentation of the RICSAC test results.
    This paper presents a detailed review and decipherment in useable form of the original 12 crash tests that were performed within the RICSAC program. A new method of analyzing accelerometer data from arbitrary sensor positions, on the basis of discrete measures of the vehicle responses rather than complete time-histories, is defined. A discussion of previous research which included reference to the RICSAC test results as a measure of the validity of reconstruction computer programs is included.
sample figures from the paper
Figure 3.jpg
Figure 3.jpg (90.07 KiB) Viewed 6195 times
Table7.jpg
Table7.jpg (66.5 KiB) Viewed 6195 times
Just FYI the 3 other papers we published that year (and all made SAE transactions)

This topic has 4 more posts with additional information

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