The Effect of Using the Same Tire Friction for Both Vehicles in Impact Speed Reconstructions MEA Forensic Engineers and Scientists

Format:

Book

Conference/Event

Author/Creator:

Heinrichs, Bradley E., author.

Contributor:

Toscano, Dwayne

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Most collision reconstructions implicitly assume the same tire/road friction coefficient for all vehicles, despite evidence that friction varies between tires, surfaces, and individual trials. Here we assess the errors introduced by an assumption of a single, universal friction coefficient when reconstructing a collision where vehicles actually had different tire frictions. We used Monte Carlo methods to generate 20,000 synthetic two-vehicle impacts and rest positions using different, randomized friction coefficients for each vehicle and randomized impact speeds. These rest positions were then used to reconstruct both vehicles' impact speeds assuming a single, common friction coefficient. High and low bounds on the impact speeds were reconstructed using high and low bounds on the common friction. We found that more than 97% of the true impact speeds were in the ranges reconstructed using upper and lower friction bounds. The influence of the similar-friction assumption on the errors in the reconstructed speeds was secondary to the influence of using the wrong average friction for both of vehicles

Notes:

Vendor supplied data

Publisher Number:

2021-01-0899

Access Restriction:

Restricted for use by site license