McHenry Forum - Crash Reconstruction & Simulation

in 1974 Rice and Del'Amico published a study entitled " An Experimental Study of Automobile Driver Characteristics and Capabilities " Calspan Report No. ZQ-5208-K-1. The study included approximately 100 drivers driving one or two test vehicles in five trails through a continuous course con...

Research performed in the 1970's to “locate, review, decipher and place in useable form available experimental data on the structural crush properties of automobiles, and on the spinout trajectories produced by measured collision conditions” [1] revealed significant limitations in the available docu...

For convenience here's a quick link to the latest post in this topic 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 a...

Q: I just happened across a copy of the Declaration of Brian G. McHenry in the Washington v Sipin case on the internet and I wanted to find out more about the proposed Validation Index by the Human Biomechanics and Simulation Standards Committee you mention in item 7-e . Can you steer me to the reco...

As part of our research for SAE paper 97-0961 RICSAC-97-A Reevaluation of the Reference Set of Full Scale Crash Tests, SAE Paper 97-0961" we included documentation of the techniques for determination of the DeltaV and PDOF in SMAC and how that compares to the DeltaV and PDOF measured in full-sc...

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...

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...

Q: According to Gillespie, the center of the turn must lie on a projection of the rear axle, with the radius of the curve through the center of gravity of the vehicle. The perpendicular of both front wheels also must also pass through the center of the turn. A: In real cars, at low speed the rear wh...

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 Dec 2019: NOW ON Groups.IO https://groups.io/g/INCR (Was on Yahoo. Yahoo dumped groups! #NOT groups.yahoo.com/neo/groups/INCR/info) From the site:...

I have posted pages from CRASH3 manual for those interested in what is the 'effective mass'. Please see EFFECTIVE MASS in Momentum Also see pg 54-57 of 1976 report User's Manual for the CRASH program Here are the pages of interest: Effective Mass Concept Related page from 1976 Crash Manual