Search found 1788 matches

by MSI
Mon Mar 25, 2024 12:34 pm
Forum: McHenry News!
Topic: Raymond R McHenry, Pioneer in Crash Reconstruction
Replies: 5
Views: 8819

Re: Raymond R McHenry, Pioneer in Crash Reconstruction

March 2024, Ray is 95 and healthy and doing great.
by MSI
Mon Mar 25, 2024 12:13 pm
Forum: General Topics
Topic: Is a Straight Line From Impact to Rest in Momentum Correct?
Replies: 1
Views: 1892

Re: Is a Straight Line From Impact to Rest in Momentum Correct?

March 2024: edited updated and added the graphics
by MSI
Sun Mar 24, 2024 11:24 am
Forum: Collision Simulation, SMAC
Topic: The Effects of Friction on EDRs and DeltaV
Replies: 6
Views: 22597

Re: The Effects of Friction on EDRs and DeltaV

March 2024, added mention and link For restitution effects, please see Effects of Restitution on the Application of Crush Coefficients for details on effects of restitution, which "reduces the residual deformation while increasing the total impact speed change". In this forum topic, we foc...
by MSI
Sun Mar 24, 2024 10:49 am
Forum: Damage Analysis, CRASH
Topic: What Speed Should I Use to Calculate CRASH3 A&B Coeff?
Replies: 2
Views: 1551

Re: What Speed should I Use to Calculate CRASH3 A&B Coeff?

Q: The argument behind the idea that we're getting to dV from damage and stiffness (and, of course, BEV) made me hesitate...maybe I read stuff wrong before and it IS dV we should be using. But, by my way of thinking, if I work it all the way back to Emori, for example, the input was always the spee...
by MSI
Sat Mar 23, 2024 1:33 pm
Forum: General Topics
Topic: Rollover Analysis: minimum speeds and roll velocity approximation
Replies: 9
Views: 9592

Re: Rollover Analysis: minimum speeds and roll velocity approximation

Q: (Posted to a Facebook forum) Can anyone here share a rollover formula? A: One of the responses was: During WREX 2016 a presenter gave a presentation on a new rollover formula. S=sqrt 13(d). The distance is from trip to final rest. I have used it several times and get within 5mph of the minimum sp...
by MSI
Sat Mar 23, 2024 11:58 am
Forum: Damage Analysis, CRASH
Topic: What Speed Should I Use to Calculate CRASH3 A&B Coeff?
Replies: 2
Views: 1551

Re: What Speed should I Use to Calculate CRASH3 A&B Coeff?

Q: Got into a discussion with someone and we ran into a "conundrum." It has to do with a reading of the various papers and such as it relates to stiffness coefficients. So say we have a set of crash test data and we want to find stiffness coefficients. The discussion hinges on the velocit...
by MSI
Sat Mar 09, 2024 1:24 pm
Forum: Damage Analysis, CRASH
Topic: CRASH Damage Analysis Estimations at Higher DeltaVs?
Replies: 0
Views: 58

CRASH Damage Analysis Estimations at Higher DeltaVs?

Q: I am attempting to determine what research exists into how the CRASH algorithm may/may not overestimate DV at higher levels (i.e. 75mph). In my research I have found 1982 DOT HS 806 152 Accuracy & Sensitivity of CRASH by Smith and Noga which appears to show good correlation in the mid 60's D...
by MSI
Sun Mar 03, 2024 10:29 am
Forum: Vehicle Safety
Topic: "Moral Hazard" of safety devices and solutions?
Replies: 0
Views: 63

"Moral Hazard" of safety devices and solutions?

Read an interesting Op-ed article today in NY Time Opinion: Moral Hazard Has No Place in Addiction Treatment Which was about a concept called ' Moral Hazard " and included a mention of how it came into being which related to safety belts in cars?!! From the article "The University of Chica...
by MSI
Fri Mar 01, 2024 11:30 am
Forum: General Topics
Topic: What files should be produced for Simulation and Animation
Replies: 3
Views: 8875

Re: What files should be produced for Simulation and Animation

updated/refined with minor changes for clarification.