Search found 1809 matches
- Fri Jun 19, 2009 11:11 am
- Forum: Simplified Momentum Analysis, PC-Crash, Virtual Crash
- Topic: Some Momentum Misconceptions
- Replies: 3
- Views: 3572
Some Momentum Misconceptions
Some comments on Momentum analysis: (1) The collision between two vehicles is not the same as a collision between two pool balls. More like two crushable rectangular boxes on wheels. And vehicles are not 'balls' or 'points', they are finite dimensioned crushable objects which may behave quite differ...
- Fri Jun 19, 2009 11:05 am
- Forum: Highway Safety
- Topic: Effects of Speed on Accident Frequency?
- Replies: 5
- Views: 16719
Effects of Speed on Accident Frequency?
CASR Speed Study In 1994 & 1998 McHenry Software participated in a study of crashes with the Road Accident Research Unit (RARU) of the University of Adelaide, Australia. They now go by the name Centre for Automotive Safety research (CASR) Summary The Road Accident Research Unit at Adelaide Univ...
- Fri Jun 19, 2009 11:01 am
- Forum: Specs, Crash Tests, Etc.
- Topic: Coefficient of friction of soft soils?
- Replies: 0
- Views: 2824
Coefficient of friction of soft soils?
For historical information, check out " Roadside Design for Safety " by Stonex (1960). It may be in other Stonex papers (some published through SAE since they include a lot of history on crash safety research). In the 1960 paper he towed vehicles sideways through wet and dry sod. In the St...
- Fri Jun 19, 2009 10:31 am
- Forum: General Topics
- Topic: Location of Gouges relative to Point of Impact?
- Replies: 0
- Views: 2723
Location of Gouges relative to Point of Impact?
Q: Assuming that a t-boned vehicle created a rim gouge from the impact, how far (laterally) would you expect the vehicle to have traveled prior to commencing the gouge? A: Some things to consider in relation to the location of a gouge mark to the initial point or area of impact: 1) Impact/separation...
- Fri Jun 19, 2009 10:23 am
- Forum: Damage Analysis, CRASH
- Topic: Does CRASH/EDCRASH include restitution?
- Replies: 1
- Views: 5166
Does CRASH/EDCRASH include restitution?
Q: Does CRASH/EDCRASH include restitution? A: NO! Restitution is not included in the fundamental equations of CRASH. Restitution is NOT included in any commercial version of CRASH. Restitution consists of two separate aspects: A partial dimensional recovery and A partial restoration of kinetic ener...
- Fri Jun 19, 2009 10:17 am
- Forum: General Topics
- Topic: Photogrammetry transformation matrix?
- Replies: 0
- Views: 2213
Photogrammetry transformation matrix?
The fundamental principle used by photogrammetry is that through "known" distances into and across a photograph, you can traingulate to determine "unknown" distances in a photograph. Check out Northwestern and look for 'Perspective Grid for Photographic Mapping of Evidence' it to...
- Fri Jun 19, 2009 10:07 am
- Forum: General Topics
- Topic: DeltaV in terms of G's?
- Replies: 0
- Views: 3909
DeltaV in terms of G's?
Q: I am used to discussing Delta -V for the forces on a person in a crash. Another expert is using G's. What is the conversion from one to the other? A: DeltaV, or Impact speed change, is normally associated with a collision. (to avoid those among you who will say `but you encounter a DeltaV when br...
- Fri Jun 19, 2009 9:45 am
- Forum: What Is?
- Topic: What it the "Ball Bank Indicator" and what does it measure?
- Replies: 2
- Views: 14875
What it the "Ball Bank Indicator" and what does it measure?
The term " Ball Bank Indicator " refers to an inclinometer that is used for the specific purpose of determining safe (uniform advisory) curve speeds for horizontal curves. It measures the overturning force (side friction), measured in degrees, on a vehicle negotiating a horizontal curve - ...
- Thu Jun 18, 2009 7:27 pm
- Forum: Welcome! Please Read!
- Topic: Welcome to the McHenry Software forum!
- Replies: 4
- Views: 20559
Welcome to the McHenry Software forum!
Welcome to the new McHenry Software forum! June 22, 2009 : This forum is being added to provide an active interaction between McHenry Software , our users and the Collision Reconstruction community. We will post up software questions and answers, information, tips, specific instructions, and a wide...