McHenry Forum - Crash Reconstruction & Simulation

The following is some comments I made on another forum in 2000 in response to the question: What is DeltaV? Q: What is DeltaV? A: DeltaV is the time integral of the acceleration during the collision event. Acceleration alone cannot characterize injury. I recall seeing a list of some very high and ve...

Wade Bartlett has a monthly mailbox review which includes all sorts of neat 'stuff'. We recommend signing up for Wade's mailbox review if you don't already get it though some newgroup (like INCR ). To sign up: http://tech.groups.yahoo.com/group/Mailbox_Review/ The following is from Wade and containe...

some additional resources on the problem of cel phone use while driving:
Car & driver tests
And another NY Times article on cel phone issues.

Q: Can anyone provide any references to papers or textbooks that address the issue of doing crush analysis on vehicles after they have been repaired, specifically making a determination of delta V from an examination of a repaired vehicle? A: The choice/decision to replace and/or repair a vehicle co...

Q: I have been given a report that states it takes 6468 Newtons to fracture a bone in the ankle. The report then states this yields a acceleration of 14.5 g and that over a typical contact time of .1 sec during the collision which yields a collision speed change of at least 16 mph. What's the deal w...

Q: Have YOU or someone you know been involved in an accident and need HELP? A: In many cases over the years we have assisted individuals in accidents to help them sort out the facts and circumstances of the accident/collision. The initial and main assistance is to instruct them to try to accumulate ...

IF YOU or someone you know has been involved in an crash aka accident and need HELP! In many cases over the years we have assisted individuals involved in crashes/accidents to help them sort out the facts and circumstances of the accident/collision. The initial and main assistance is to instruct th...

I had a recent case where an 'expert' used the 'force balancing' technique to reconstruct a 3 vehicle accident! AND there were only photographs of damage to one of the 3 vehicles! Yes, and it gets better. Then the 'expert' used the ATB ( GATB to be specific) to do an analysis of the injury potential...

From another news group there was posted the following: The NHTSA database has experienced a "glitch" where it has replaced the DPD4 (Damage Profile Distance 4) measurement with the value of -581 in a large number (all???) of tests. Two examples of this are tests 3438 and 6357, where the p...

A: What constitutes 'typical' is a function of the 1) Turn , 2) Vehicle and 3) Driver : 1) Turn : ‘typical' turning maneuvers are considered in the design process. Consult the AASHTO green book (or similar roadway/intersection design book) for definitions of what constituted 'typical'. Generally 'ty...