Documentation:FIB book/problems/Sled test1

From UBC Wiki
Figure 1: Crash scenario immediately before first car-on-car impact.
Figure 2: Crash scenario following secondary impact of red car into tree.

Sled tests are a useful tool for simulating driver and vehicle response in a crash. Please consider the following described crash scenario and questions with regard to designing a sled test for injury biomechanics purposes.

The crash scenario described can be seen depicted in Figures 1 and 2. The red car, driven by a woman with her stocky male partner as a passenger, was traveling counter-clockwise around the roundabout when the blue car merged from the left entry point. The driver of the blue car (alone in the vehicle) entered the roundabout at too high of a velocity. Despite braking, the red car was still rear-ended by the blue car and propelled out of the roundabout to impact a nearby tree. Figure 1 shows the scene immediately before the initial car-on-car impact and Figure 2 shows the scene a few seconds after both impacts occurred.

Question 1

Briefly describe the types of sled tests you would use to model the two impact scenarios, testing the red car in particular:

1) blue car into red car, and

2) red car into tree.

Please address the following points for each scenario:

a) Would a buck sled test suffice or should a destructive crash test be carried out?

b) What type of sled test is relevant?

c) What type of ATD(s) would you recommend using?

Question 2

Please describe three differences between acceleration and deceleration sleds.

Question 3

What sort of outcome parameters would be useful to evaluate in such sled tests? Please describe at least two that relate to injury biomechanics and two that relate to the vehicle response in a crash.

Question 4

Please give two examples of interior vehicle components specifically that can be evaluated for research or consumer information purposes, and what research questions can be evaluated using a sled test.