Publications

Analytical Model for Investigating Low-Speed Sideswipe Collisions

Authors

Dr. James R. Funk, Mr. Joseph M. Cormier, Dr. C.E. “Ted” Bain

Publication

Accident Reconstruction 2004 (SP-1873). Warrendale, PA, Society of Automotive Engineers, Inc. 2004; 23-34. SAE Paper #2004-01-1185.

Abstract

Vehicle dynamics in sideswipe collisions are markedly different from other types of collisions.  Sideswipe collisions are characterized by prolonged sliding contact, often with very little structural deformation.  An analytical model was developed to investigate the vehicle dynamics of sideswipe collisions.  The vehicles were modeled as rigid bodies, and lateral interaction between the vehicles was modeled with a linear elastic spring.  This linear spring was meant to represent the combined lateral stiffness of both vehicles before significant crush develops.  Longitudinal interaction between the vehicles was modeled as frictional contact.  In order to validate the model, seven (7) low-speed (3 - 10 kph), shallow angle (15ş) sideswipe collisions were staged with instrumented vehicles.  These sideswipe collisions were characterized by long contact durations (~ 1 s) and low accelerations (< 0.4 g's). The experimental collisions were also simulated with EDSMAC. EDSMAC overpredicted peak longitudinal vehicle acceleration by an average of 83% and underpredicted the length of contact damage by an average of 50%. In contrast, the linear spring model accurately predicted the peak longitudinal vehicle acceleration (5% error) when the stiffness parameter was tuned to match the length of contact damage. These results suggest that a noncrush-based linear spring model for calculating intervehicular force could significantly improve the accuracy of reconstructions of low-speed sideswipe collisions compared to existing methods such as SMAC.

The following papers are published on this website with permission from SAE International.  As a user of this website, you are permitted to view these papers on-line, download these .pdf files and print one copy of these papers at no cost for your use only. The downloaded .pdf files and printout of these SAE papers may not be copied, distributed or forwarded to others or for the use of others.  SAE Paper # 930094, 1999-01-3235, 2004-01-1185, and 2004-01-1193 © 1993, 1999, 2004 SAE International.

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