Search found 700 matches

by MSI
Sun Jun 21, 2009 2:17 pm
Forum: What Is?
Topic: What is Validation for vehicle to vehicle collision models?
Replies: 1
Views: 2126

What is Validation for vehicle to vehicle collision models?

For vehicle to vehicle collisions methods validation, obviously cars are mass produced and so full scale tests can be performed from which validations of computer models can be ascertained ( RICSAC tests, etc). There was a group at SAE 15 years or so ago that I participated in which was trying to co...
by MSI
Sat Jun 20, 2009 2:01 pm
Forum: What Is?
Topic: What is the SMAC Inter-vehicle friction coefficient?
Replies: 1
Views: 1489

What is the SMAC Inter-vehicle friction coefficient?

Q: What range of values should be used in SMAC for inter-vehicle friction? A: From our SAE paper 970947 SMAC-97 : "The Inter-vehicle friction coefficient of the SMAC collision model ( AMU, SMAC input card 13, field 7 ) is based on coulomb friction. Coulomb friction is independent of the sliding velo...
by MSI
Fri Jun 19, 2009 11:43 am
Forum: What Is?
Topic: What is INCR?
Replies: 1
Views: 4668

What is INCR?

The INCR referred to in the link is the International Network of Collision Reconstructionists. I am a member and contributor to INCR. INCR is a newsgroup on Yahoo. https://groups.yahoo.com/neo/groups/INCR/info From the site: Description This is a by-invitation-only network of crash/accident reconstr...
by MSI
Fri Jun 19, 2009 11:26 am
Forum: Collision & Trajectory Analysis
Topic: Should a CRASH type damage analysis include induced damage?
Replies: 2
Views: 2604

Should a CRASH type damage analysis include induced damage?

2 words of wisdom on CRASH type damage analysis (whatever flavor: EDCRASH, WinCRASH, etc): Be Careful! In 1988, Tumbus and Smith wrote SAE paper 880072: Measurement protocol for quantifying vehicle damage from an energy basis point of view ]. In the paper they presented some ideas for a standardized...
by MSI
Fri Jun 19, 2009 11:11 am
Forum: Collision & Trajectory Analysis
Topic: Some Momentum Misconceptions
Replies: 3
Views: 6226

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...
by MSI
Fri Jun 19, 2009 11:11 am
Forum: msmac3D General Q&A
Topic: Some Momentum Misconceptions
Replies: 2
Views: 207

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...
by MSI
Fri Jun 19, 2009 11:05 am
Forum: Highway Safety Issues
Topic: Effects of Speed on Accident Frequency?
Replies: 2
Views: 3512

Effects of Speed on Accident Frequency?

CASR Speed Study 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 University with the sup...
by MSI
Fri Jun 19, 2009 10:07 am
Forum: Collision & Trajectory Analysis
Topic: DeltaV in terms of G's?
Replies: 0
Views: 1204

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...
by MSI
Fri Jun 19, 2009 9:45 am
Forum: What Is?
Topic: What it the "Ball Bank Indicator" and what does it measure?
Replies: 0
Views: 2532

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 - whether it...
by MSI
Thu Jun 18, 2009 7:27 pm
Forum: Welcome! Please Read!
Topic: Welcome to the McHenry Software forum!
Replies: 3
Views: 6207

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...