Collision Speed Estimation Using a Single Normalised Crush Depth-Impact Speed Characteristic 920604
Theoretical consideration of the energy absorption properties of structures shows that the specific energy absorption (E/Mk) is related to the normalised crush depth (d/L) and to a stress/density parameter. Examination of the crush characteristics of the car population shows that the mean stress/density parameter of the car population in frontal crush is independent of car size. On this basis regression is carried out which relates (2×E/Mk)½ to normalised crush depth (d/L)⅔
Using data from nine staged frontal car to car collisions this generalised specific energy absorption representation is compared with CRASH 3 and with Prasad's (5) individual car reformulation. It is shown that the accuracy of Delta V prediction with Prasad's individual car reformulation is superior to both the normalised crush depth model proposed here and to CRASH 3, both of which have similar accuracies. A missing vehicle energy estimator, E1×[1+Mk1/Mk2] is examined as is the crush depth energy estimator, E1×[1+d2̄/d1̄]. lt is shown that in conjunction with the normalised frontal crush depth regression they can be applied to frontal and to 90 degree front/side car to car collisions.
Citation: Wood, D., "Collision Speed Estimation Using a Single Normalised Crush Depth-Impact Speed Characteristic," SAE Technical Paper 920604, 1992, https://doi.org/10.4271/920604. Download Citation
Author(s):
Denis P. Wood
Pages: 16
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Accident Reconstruction: Technology and Animation Ii-SP-0907, SAE 1992 Transactions: Journal of Passenger Cars-V101-6
Related Topics:
Crashes
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